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CHANGELOG.md

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Archivo original ↗Preguntar a KiBot
This is the Changelog for Judge0 CE. The Changelog for Judge0 Extra CE can be found [here](https://github.com/judge0/judge0/blob/extra/CHANGELOG.md). Learn more about their difference [here](https://github.com/judge0/judge0#flavors).

# v1.13.1 (2024-04-18)
Security researcher [Daniel Cooper](https://www.linkedin.com/in/daniel-cooper4) (@stacksparrow4) found three critical vulnerabilities in Judge0 versions `<= 1.13.0`, which this release fixes. Thank you, Daniel, for your contribution.

## Security Fixes
This release fixes the following security vulnerabilities:
- [CVE-2024-28185](https://github.com/judge0/judge0/security/advisories/GHSA-h9g2-45c8-89cf)
- [CVE-2024-28189](https://github.com/judge0/judge0/security/advisories/GHSA-3xpw-36v7-2cmg)
- [CVE-2024-29021](https://github.com/judge0/judge0/security/advisories/GHSA-q7vg-26pg-v5hr)

## Deployment Procedure
Judge0 is collecting telemetry data to help improve the product and understand its use in various production environments. Read more about telemetry [here](https://github.com/judge0/judge0/blob/v1.13.1/TELEMETRY.md).

#### System Requirements
Please note that Judge0 has only been tested on **Linux** and might not work on other systems; thus, we do not provide support for it.

We recommend using Ubuntu 22.04, on which you need to do the following update of GRUB:
1. Use `sudo` to open file `/etc/default/grub`
2. Add `systemd.unified_cgroup_hierarchy=0` in the value of `GRUB_CMDLINE_LINUX` variable.
4. Apply the changes: `sudo update-grub`
5. Restart your server: `sudo reboot`

Additionally, make sure you have [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose) installed.

#### Deployment Steps
1. Download and extract the release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.13.1/judge0-v1.13.1.zip
unzip judge0-v1.13.1.zip
```

2. Visit [this website](https://www.random.org/passwords/?num=1&len=32&format=plain&rnd=new) to generate a random password.
3. Use the generated password to update the variable `REDIS_PASSWORD` in the `judge0.conf` file.
4. Visit again [this website](https://www.random.org/passwords/?num=1&len=32&format=plain&rnd=new) to generate another random password.
5. Use the generated password to update the variable `POSTGRES_PASSWORD` in the `judge0.conf` file.
6. Run all services and wait a few seconds until everything is initialized:
```
cd judge0-v1.13.1
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```
7. Your instance of Judge0 CE v1.13.1 is now up and running; visit docs at `http://<IP ADDRESS OF YOUR SERVER>:2358/docs`.


# v1.13.0 (2021-03-10)
Huge thanks to [**Filtered**](https://www.filtered.ai) for sponsoring this release.

## New Features
- Added support for `enable_network` configuration flag. With the new `ALLOW_ENABLE_NETWORK` configuration variable, usage of this flag can be permitted or denied. Furthermore, with the new `ENABLE_NETWORK` configuration variable the default value of this flag can be set for every submission.
    - Commits: [@62a00520](https://github.com/judge0/judge0/commit/62a00520692c2b7a8bf0f54528aee8fbbf864f36)
- Added `USE_DOCS_AS_HOMEPAGE` configuration variable, which allows you to show or hide Judge0 homepage. **Now, by default, Judge0 homepage is empty** and does not show the API documentation. However, you can still access the API documentation via `/docs`.
    - Issues: [#257](https://github.com/judge0/judge0/issues/257)

## Bug Fixes
- Fixed the bug where the wrong number of workers would be reported via `/workers`.
	- Issues: [#256](https://github.com/judge0/judge0/issues/256)

## Security Fixes
- **HIGH** Fixed a security bug where certain submission configuration settings would allow the user to run a program that would run infinetly long. With this fix `wall_time_limit` **must** be at least 1 second.
	- Commits: [@fce8d97a](https://github.com/judge0/judge0/commit/fce8d97ae765e87c4584115fcb73bd288d64d815)

## Other Changes
- Allow setting the `max_file_size` and `stack_limit` to 0 kB.
	- Issues: [#242](https://github.com/judge0/judge0/issues/242)
	- Commits: [@bf7c1284](https://github.com/judge0/judge0/commit/bf7c1284fe756d348154546ad8a6280ce3af5eb2) [@5a4b79ab](https://github.com/judge0/judge0/commit/5a4b79abd19c20b7b26ef70cf862da25f5fd8008)
- Allow setting the `cpu_time_limit` and `cpu_extra_time` to 0 seconds.
	- Commits: [@fce8d97a](https://github.com/judge0/judge0/commit/fce8d97ae765e87c4584115fcb73bd288d64d815)
- Updated to a port 2358 as a new **default port for Judge0** as a online code execution service.
	- Issues: [#205](https://github.com/judge0/judge0/issues/205)
	- Commits: [@ea9c7c97](https://github.com/judge0/judge0/commit/ea9c7c975e0697d66ada910ec7806d3c28ad4a03)
- Updated the default number of Judge0 Workers, those that acutally run the user's code, to the 2*[`nproc`](https://linux.die.net/man/1/nproc). This has been shown as a good choice for general purpose use-case.
	- Commits: [@113d9c74](https://github.com/judge0/judge0/commit/113d9c74b4659cf6707e748eb6e04701ce67d3f0)
- Updated the default number of Rails threads to `nproc` and Rails processes to 2. This has been shown as a good choice for general purpose use-case.
	- Commits: [@113d9c74](https://github.com/judge0/judge0/commit/113d9c74b4659cf6707e748eb6e04701ce67d3f0)
- Updated Let's Encrypt Docker image for deployment with HTTPS.
	- Commits: [@86b7f8e8](https://github.com/judge0/judge0/commit/86b7f8e8d0154ab5044db91c537872ea8deb7343)
- Updated Nginx proxy Docker image that is used in development setup and deployment with HTTPS.
	- Commits: [@83f5b175](https://github.com/judge0/judge0/commit/83f5b175d0925fe21374e9c70d7fbb4e6941fa9c)
- Fixed documentation typos. Thank you @balababa.
	- Pull Requests: [#245](https://github.com/judge0/judge0/pull/245)
- Updated base image to `judge0/compilers:1.4.0` which uses updated Isolate to [@ad39cc4d](https://github.com/judge0/isolate/commit/ad39cc4d0fbb577fb545910095c9da5ef8fc9a1a).

## Deployment Procedure
Judge0 is collecting telemetry data to help understand how to improve the product and to better understand how Judge0 is used in various production environments. Read more about telemetry [here](https://github.com/judge0/judge0/blob/v1.13.0/TELEMETRY.md).

Please note that Judge0 has only been tested on **Linux** and **macOS**, and might not work on Windows, thus we do not provide support for it.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract the release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.13.0/judge0-v1.13.0.zip
unzip judge0-v1.13.0.zip
```

3. Run all services and wait a few seconds until everything is initialized:
```
cd judge0-v1.13.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 CE v1.13.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>:2358`.

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract the release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.13.0/judge0-v1.13.0-https.zip
unzip judge0-v1.13.0-https.zip
```

3. Change directory to `judge0-v1.13.0-https`:
```
cd judge0-v1.13.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait a few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 CE v1.13.0 is now available at `https://<YOUR DOMAIN>`.


# v1.12.0 (2020-10-18)
## New Features
- Added support for invalidating statistics cache using the `invalidate_cache` query parameter.
    - Commits: [@561c2a30](https://github.com/judge0/judge0/commit/561c2a309d98680801628fc2d79ea17e885e1d66)
- Added rake task `judge0:run_in_queue` to manually run submissions that might have stuck in the `In Queue` state.
    - Commits: [@c3b87d23](https://github.com/judge0/judge0/commit/c3b87d232a8e922b5ae04f5afdb12fc49b2ec003)
- Added support for specifying `CALLBACKS_MAX_TRIES` and `CALLBACKS_TIMEOUT`. This is a global configuration that applies to all submissions that have defined webhooks (HTTP callbacks).
    - Commits: [@c4bb76ec](https://github.com/judge0/judge0/commit/c4bb76ec866bce6b07bd733391291e720f40ef96)
- Added support for submission caching to reduce the number of unnecessary database hits. Cache duration can be controlled with the `SUBMISSION_CACHE_DURATION` variable which is currently set to 1 second by default. Submissions are only cached for `GET /submissions/<token>` route. Cache files are written to the server's file system and are automatically cleared every day at midnight. This is the first step toward more serious submission caching in the future.
    - Commits: [@7a33c61c](https://github.com/judge0/judge0/commit/7a33c61c8dcbcdbf31fd4d93ef76cc2f1f5e154b) [@0b344920](https://github.com/judge0/judge0/commit/0b344920bd70bd2bf4b2a53fc78b6b145c298cbc)

## Improvements
- Update PostgreSQL to 13.0 and Redis to 6.0.
    - Commits: [@05330f11](https://github.com/judge0/judge0/commit/05330f112b26850a18c59a380991f8b401eae224) [@be300efa](https://github.com/judge0/judge0/commit/be300efa4bec7653303bb76681f91588550c25ef)
- Reschedule failed jobs after 0.1 seconds with 100 attempts.
    - Commits: [@f7265cf8](https://github.com/judge0/judge0/commit/f7265cf8d53ef5319a9e96e1bf7bee8649b09762) [@e003c888](https://github.com/judge0/judge0/commit/e003c888e64ea4f4a83e1acce8d355b666276aa2)
- Send only submission ID to the worker and not the whole serialized submission.
    - Commits: [@f7265cf8](https://github.com/judge0/judge0/commit/f7265cf8d53ef5319a9e96e1bf7bee8649b09762) [@4222c090](https://github.com/judge0/judge0/commit/4222c090689deb1a356cf6c2588b81b9904124f1)
- Automatically restart Judge0 server without the need for Docker restart policies. Use the `RESTART_MAX_TRIES` variable to specify the maximum number of restart tries.
    - Commits: [@65756516](https://github.com/judge0/judge0/commit/65756516b331265ec5a6742372ecc57ecbb8ca71) [@c0fd97e2](https://github.com/judge0/judge0/commit/c0fd97e2359172f7fc8bf7195089ab7c19845728)

## Bug Fixes
- Fixed a bug in the `is_project` method of submission model where an exception was raised and not handled properly due to unknown language.
    - Commits: [@6426ac61](https://github.com/judge0/judge0/commit/6426ac61ea6723fcf6b93b72024ec39e3dc4b7f2)

## Other Changes
- Use Docker volumes for storing Postgres and Redis data instead of mounting directories. This is now the new recommended setting.
    - Commits: [@600f5aaa](https://github.com/judge0/judge0/commit/600f5aaa3facfef38dd2cd5df25ac248734ace97)
- Added Resque Web to the development stack.
    - Commits: [@3762a635](https://github.com/judge0/judge0/commit/3762a6355b8911d8d8e13d91869edeef9bec0a4f)
- Changed binding ports for Nginx and documentation server in the development stack. Nginx is now bound to port 80, and the development server to port 3001.
    - Commits: [@3762a635](https://github.com/judge0/judge0/commit/3762a6355b8911d8d8e13d91869edeef9bec0a4f)
- Removed port bindings of Postgres and Redis in the development stack.
    - Commits: [@3762a635](https://github.com/judge0/judge0/commit/3762a6355b8911d8d8e13d91869edeef9bec0a4f)
- Added PgBouncer to the development stack for testing and experimenting.
    - Commits: [@24b3227a](https://github.com/judge0/judge0/commit/24b3227a0a47dcca89041e1c08106d08a413dcf3)
- Changed recommended values for `POSTGRES_DB` and `POSTGRES_USER`. Both are now `judge0`.
    - Commits: [@745f4455](https://github.com/judge0/judge0/commit/745f4455937d15f2f6093539e9ab96c40bc506da)

## Deployment Procedure
Judge0 is collecting telemetry data to help understand how to improve the product and to better understand how Judge0 is used in various production environments. Read more about telemetry [here](https://github.com/judge0/judge0/blob/v1.12.0/TELEMETRY.md).

Please note that Judge0 has only been tested on **Linux** and **macOS**, and might not work on Windows, thus we do not provide support for it.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.12.0/judge0-v1.12.0.zip
unzip judge0-v1.12.0.zip
```

3. Run all services and wait a few seconds until everything is initialized:
```
cd judge0-v1.12.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 v1.12.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.12.0/judge0-v1.12.0-https.zip
unzip judge0-v1.12.0-https.zip
```

3. Change directory to `judge0-v1.12.0-https`:
```
cd judge0-v1.12.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait a few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 v1.12.0 is now available at `https://<YOUR DOMAIN>`.


# v1.11.0 (2020-09-09)
## New Features
- Added queue size into response of `/workers`.
    - Issues: [#210](https://github.com/judge0/judge0/issues/210)
    - Commits: [@7ee1b10c](https://github.com/judge0/judge0/commit/7ee1b10c79576e745140f02d49446d57a208bcca)

## Improvements
- Set configuration defaults even if `judge0.conf` is not present. Thank you @vvalchev.
    - Issues: [#206](https://github.com/judge0/judge0/issues/206)
    - Commits: [@8c42f7be](https://github.com/judge0/judge0/commit/8c42f7befcdf8d70fa8cb4e3ba549c828c38164d)

## Other Changes
- Updated documentation with some better explanation on the use of `base64_encoded` query parameter. Thank you @mejibyte.

## Deployment Procedure
Judge0 is collecting telemetry data to help understand how to improve the product and to better understand how Judge0 is used in various production environments. Read more about telemetry [here](https://github.com/judge0/judge0/blob/v1.11.0/TELEMETRY.md).

Please note that Judge0 has only been tested on **Linux** and might not work on Windows or macOS, thus we do not provide support for these systems.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.11.0/judge0-v1.11.0.zip
unzip judge0-v1.11.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-v1.11.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 v1.11.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/judge0/releases/download/v1.11.0/judge0-v1.11.0-https.zip
unzip judge0-v1.11.0-https.zip
```

3. Change directory to `judge0-v1.11.0-https`:
```
cd judge0-v1.11.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 v1.11.0 is now available at `https://<YOUR DOMAIN>`.


# v1.10.0 (2020-07-27)
## New Features
- Added support for multi-file programs in the terms of adding a new special language called **Multi-file program**. In total there are now **47 active languages**.

|ID|Name|Note|
|---|---|---|
|89|Multi-file program||

Multi-file programs allow you specify your own compilation and execution scripts that Judge0 will use.

To use multi-file program feature you need to choose a language called *Multi-file program* whoose ID is **89**. Moreover, you need to send all program files with `additional_files` attribute. With multi-file programs attribute `source_code` cannot be used, i.e. all files should be sent with `additional_files` attribute.

For the Judge0 to know how to compile and execute your multi-file program you need to provide two special files that should be available in the root of the `.zip` archive that you are sending with `additional_files` attribute. These files should be named `compile` and `run`, and are expected to be Bash scripts that know how to compile and execute your multi-file program. If your multi-file program does not need compilation step, then you don't need to provide `compile` script. Take a look at [this example](https://github.com/judge0/examples/tree/master/cpp-project-01) to learn how to use this feature to compile and run multi-file C++ project that uses CMake.

## Other Changes
- Updated gems.

## Deployment Procedure
Judge0 is collecting telemetry data to help understand how to improve the product and to better understand how Judge0 is used in various production environments. Read more about telemetry [here](https://github.com/judge0/api/blob/v1.10.0/TELEMETRY.md).

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.10.0/judge0-v1.10.0-https.zip
unzip judge0-v1.10.0-https.zip
```

3. Change directory to `judge0-v1.10.0-https`:
```
cd judge0-v1.10.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 v1.10.0 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.10.0/judge0-v1.10.0.zip
unzip judge0-v1.10.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-v1.10.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 v1.10.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.9.0 (2020-06-10)
Huge thanks to [**Filtered**](https://www.filtered.ai) for sponsoring this release.

## New Features
- Added support for configuration variable `RAILS_SERVER_PROCESSES` which allows to create multiple processes for handling requests.

## Other Changes
- Updated gems.

## Deployment Procedure
Judge0 is collecting telemetry data to help understand how to improve the product and to better understand how Judge0 is used in various production environments. Read more about telemetry [here](https://github.com/judge0/api/blob/v1.9.0/TELEMETRY.md).

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.9.0/judge0-v1.9.0-https.zip
unzip judge0-v1.9.0-https.zip
```

3. Change directory to `judge0-v1.9.0-https`:
```
cd judge0-v1.9.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 v1.9.0 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.9.0/judge0-v1.9.0.zip
unzip judge0-v1.9.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-v1.9.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 v1.9.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.8.0 (2020-05-28)
Huge thanks to [**Filtered**](https://www.filtered.ai) for sponsoring this release.

## New Features
- Added **4 new languages**, and in total there are now **46 active languages**.

|ID|Name|Note|
|---|---|---|
|85|Perl (5.28.1)|Sponsored by [Filtered](https://www.filtered.ai).|
|86|Clojure (1.10.1)|Sponsored by [Filtered](https://www.filtered.ai).|
|87|F# (.NET Core SDK 3.1.202)|Sponsored by [Filtered](https://www.filtered.ai).|
|88|Groovy (3.0.3)|Sponsored by [Filtered](https://www.filtered.ai).|

## Bug Fixes
- Fixed `/statistics` route caching.
    - Issues: [#184](https://github.com/judge0/api/issues/184)
    - Commits: [@83c5cfc6](https://github.com/judge0/api/commit/83c5cfc6b4ae95fa8bdef0bba2eee98829207dd0)

## Other Changes
- Updated gems.
    - Commits: [@0c766273](https://github.com/judge0/api/commit/0c766273d7cb8009695a3aa1903719c8474a233d) [@700e6582](https://github.com/judge0/api/commit/700e65829910ee860ddfa43254847f564c0d5623)
- Increased default `CPU_TIME_LIMIT` to 5, `CPU_EXTRA_TIME` to 1, `MAX_CPU_EXTRA_TIME` to 5 and `WALL_TIME_LIMIT` to 10 seconds.
    - Commits: [@77961ab9](https://github.com/judge0/api/commit/77961ab9f6b1015d5bdb5150e29d8de06478f38c)
- Changed `HOME` environment variable value for sandbox to `/tmp`.
    - Commits: [@77961ab9](https://github.com/judge0/api/commit/77961ab9f6b1015d5bdb5150e29d8de06478f38c)
- Updated *isolate* to [@9be3ff6f](https://github.com/judge0/isolate/commit/9be3ff6ff0670763e564912a6662730e55b69536).

## Deployment Procedure
Judge0 API is collecting telemetry data to help understand how to improve the product and to better understand how the Judge0 API is used in various production environments. Read more about telemetry [here](https://github.com/judge0/api/blob/v1.8.0/TELEMETRY.md).

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.8.0/judge0-api-v1.8.0-https.zip
unzip judge0-api-v1.8.0-https.zip
```

3. Change directory to `judge0-api-v1.8.0-https`:
```
cd judge0-api-v1.8.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 API v1.8.0 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.8.0/judge0-api-v1.8.0.zip
unzip judge0-api-v1.8.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.8.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 API v1.8.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.7.1 (2020-05-06)
## Bug Fixes
- Compile Swift before executing since default file size limit of 1MB for execution is not enough for Swift to run successfully. Compilation has a file size limit of 4MB by default which seems to be enough for Swift to compile. Thanks @OliverwengFiltered.
    - Issues: [#154](https://github.com/judge0/api/issues/154)
    - Commits: [@371e2463](https://github.com/judge0/api/commit/371e246312a41242033d916f1f4fea3db80015b7)
- Fixed environment loading for Telemetry Client.
    - Commits: [@bd16119c](https://github.com/judge0/api/commit/bd16119ccde52798b5d354afdd5e008df6d5b940)

## Other Changes
- Set `VIRTUAL_HOST` environment variable in Dockerfile to value `3000`.
- Updated Telemetry Client to version `c62fa63d`.
- Added separated Docker Compose files for server and workers.
- Renamed service `worker` to `workers` and `api` to `server`.

## Deployment Procedure
Judge0 API is collecting telemetry data to help understand how to improve the product and to better understand how the Judge0 API is used in various production environments. Read more about telemetry [here](https://github.com/judge0/api/blob/v1.7.1/TELEMETRY.md).

### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.7.1/judge0-api-v1.7.1-https.zip
unzip judge0-api-v1.7.1-https.zip
```

3. Change directory to `judge0-api-v1.7.1-https`:
```
cd judge0-api-v1.7.1-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 API v1.7.1 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.7.1/judge0-api-v1.7.1.zip
unzip judge0-api-v1.7.1.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.7.1
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 API v1.7.1 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.7.0 (2020-05-05)
Huge thanks to sponsors of this release: [**Filtered**](https://www.filtered.ai) and [**Evalart**](https://evalart.com).

## New Features
- Added **10 new languages**, and in total there are now **42 active languages**.

|ID|Name|Note|
|---|---|---|
|75|C (Clang 7.0.1)||
|76|C++ (Clang 7.0.1)||
|77|COBOL (GnuCOBOL 2.2)|Sponsored by [Evalart](https://evalart.com).|
|78|Kotlin (1.3.70)|Sponsored by [Filtered](https://www.filtered.ai).|
|79|Objective-C (Clang 7.0.1)|Sponsored by [Filtered](https://www.filtered.ai) and [Evalart](https://evalart.com).|
|80|R (4.0.0)|Sponsored by [Filtered](https://www.filtered.ai).|
|81|Scala (2.13.2)|Sponsored by [Filtered](https://www.filtered.ai).|
|82|SQL (SQLite 3.27.2)|Sponsored by [Filtered](https://www.filtered.ai). (*)|
|83|Swift (5.2.3)|Sponsored by [Filtered](https://www.filtered.ai) and [Evalart](https://evalart.com).|
|84|Visual Basic.Net (vbnc 0.0.0.5943)|Sponsored by [Filtered](https://www.filtered.ai).|

(*) Watch [this asciicast](https://asciinema.org/a/326975) to learn how to use this language.

## Other Changes
- Increased default `MAX_MEMORY_LIMIT` to 512000.
    - Commits: [@3dcbfc96](https://github.com/judge0/api/commit/3dcbfc9605a0f81680afd890a239ef2b60739186)
- Set compile CPU time limit to `MAX_CPU_TIME_LIMIT`.
    - Commits: [@3dcbfc96](https://github.com/judge0/api/commit/3dcbfc9605a0f81680afd890a239ef2b60739186)
- Set compile wall time limit to `MAX_WALL_TIME_LIMIT`.
    - Commits: [@3dcbfc96](https://github.com/judge0/api/commit/3dcbfc9605a0f81680afd890a239ef2b60739186)
- Redirect input from `/dev/null` when compiling. Thank you @gollux for your [help](https://github.com/ioi/isolate/issues/90).
    - Commits: [@42b89a7c](https://github.com/judge0/api/commit/42b89a7cdb333253460023fa7bcbf1640329d48b)

## Deployment Procedure
### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.7.0/judge0-api-v1.7.0-https.zip
unzip judge0-api-v1.7.0-https.zip
```

3. Change directory to `judge0-api-v1.7.0-https`:
```
cd judge0-api-v1.7.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 API v1.7.0 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.7.0/judge0-api-v1.7.0.zip
unzip judge0-api-v1.7.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.7.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 API v1.7.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.6.0 (2020-05-01)
## New Features
- Added support for automatically redirecting stderr to stdout of the running program with the configuration flag `redirect_stderr_to_stdout`. Added configuration variable `REDIRECT_STDERR_TO_STDOUT` that can be used for setting default behaviour for every submission.
    - Commits: [@8e6617aa](https://github.com/judge0/api/commit/8e6617aae2d4dd9106ab610738dcc5e59633b2f4)
- Added configuration variable `DISALLOW_ORIGIN` that can be used for disabling CORS only for specific origins.
    - Commits: [@f61b5496](https://github.com/judge0/api/commit/f61b54965f12a9ccb0d19d3449bc818b12881127) [@a927c9db](https://github.com/judge0/api/commit/a927c9db0f47aa8bd3d2b7dd1774a829a0cbc6f7)
- Added configuration variables `ALLOW_IP` and `DISALLOW_IP` that can be used for allowing/disallowing only specific IP addresses that can use instance of Judge0 API.
    - Commits: [@4fd0f34b](https://github.com/judge0/api/commit/4fd0f34b8f08fe808dd6b19ca96bac1e15b2a6f3)
- Added support for built in maintenance mode that can be enabled with configuration variables `MAINTENANCE_MODE` and `MAINTENANCE_MESSAGE`. In maintenance mode clients cannot create or delete submissions i.e. they cannot create new database changes.
    - Commits: [@201221e2](https://github.com/judge0/api/commit/201221e22bbe64e960306b2dcf22cc6941892e3f)
- Added support for universal field `*` which returns all attributes of a submission.
    - Commits: [@521cc2e2](https://github.com/judge0/api/commit/521cc2e2e94f1b469c084680020953e76af6e2b9)
- Added route `GET /statistics` which returns some basic and useful information about Judge0 API instance. Statistic report is cached for 10 minutes.
    - Commits: [@a24db632](https://github.com/judge0/api/commit/a24db6326b793e093a64dea877c26402c585c680) [@621c50f1](https://github.com/judge0/api/commit/621c50f1f8056e716ff073a404556e51ab3a34c3) [@eead8067](https://github.com/judge0/api/commit/eead806786fac79e13cee9fca0fe7196f116680b)
- Added basic support for callbacks which are called with HTTP verb `PUT`.
    - Pull Requests: [#98](https://github.com/judge0/api/pull/98)
    - Issues: [#33](https://github.com/judge0/api/issues/33)
    - Commits: [@41e846b1](https://github.com/judge0/api/commit/41e846b156bc7c071b9d2827271d87cfaee584f7)
- Added support for presetting custom additional files in a sandbox.
    - Issues: [#32](https://github.com/judge0/api/issues/32) [#88](https://github.com/judge0/api/issues/88)
    - Commits: [@7829db87](https://github.com/judge0/api/commit/7829db878895acdb3adfa063df03204c87cd1589) [@6d1f4293](https://github.com/judge0/api/commit/6d1f4293000a479a0cae0e9c4dc905652297199b) [@6573c52f](https://github.com/judge0/api/commit/6573c52faccee55e467457ab54742dd189a48a4b)
- Added routes `GET /submissions/batch` and `POST /submissions/batch` batch create and show or
submissions.
    - Issues: [#34](https://github.com/judge0/api/issues/34)
    - Commits: [@6420156b](https://github.com/judge0/api/commit/6420156b0ad6526bed3d638be3e824c996cd33cd) [@87859b58](https://github.com/judge0/api/commit/87859b58e4c348249237f2a7881c1c26dcb5d785) [@595c7e11](https://github.com/judge0/api/commit/595c7e11d6ede28d6bef7b98c2675f29e1ae2a9a) [@04c900c9](https://github.com/judge0/api/commit/04c900c9d9c325720ed5c807b46272a500c22a97) [@cb676d6c](https://github.com/judge0/api/commit/cb676d6c7fe3a6e9144a9246329c6223e48c6511)

## Improvements
- Use Redis queue with name that corresponds with the current Judge0 API version. This allows multiple instances of different versions of Judge0 API to use the same Redis instance.
    - Commits: [@dd6b62d7](https://github.com/judge0/api/commit/dd6b62d73c6ab0ef028711258e2edb141c1ba81a)
- Refactored submission field checking.
    - Commits: [@9acefdbc](https://github.com/judge0/api/commit/9acefdbc7959ff88770ea186d12a085158bce521)
- Refactored setting up of default values.
    - Commits: [@a14ae5d5](https://github.com/judge0/api/commit/a14ae5d540db75a0ade3a4dbfc12e6120d0c1ee2)

## Bug Fixes
- Fixed a bug that ignored custom setting of configuration variables `enable_per_process_and_thread_time_limit` and `enable_per_process_and_thread_memory_limit`.
    - Commits: [@a6f693a0](https://github.com/judge0/api/commit/a6f693a0ced221a28a3f4b4815e9d3baf8c2c4c0)
- Fixed a bug where cgroups flags for isolate were chosen in the wrong conditions.
    - Commits: [@4116b9cb](https://github.com/judge0/api/commit/4116b9cb988816cad81f6b5c3265da01a8cec120)
- Fixed a bug that caused `Internal Error` because sandbox cleanup failed.
    - Pull Requests: [#126](https://github.com/judge0/api/pull/126)
    - Issues: [#123](https://github.com/judge0/api/issues/123) [#143](https://github.com/judge0/api/issues/143)
    - Commits: [@514aec53](https://github.com/judge0/api/commit/514aec53dca8f1fb9f8f153add05c14d263d6624)
- Fixed a bug where low `memory_limit` would cause `Internal Error`. Minimum required value for `memory_limit` is now 2048.
    - Commits: [@655ccf27](https://github.com/judge0/api/commit/655ccf277aad2c11371ca223c5386380c0bfc4ba)

## Security Fixes
- Fixed a bug that allowed creation of an arbitrary size of the compile output.
    - Commits: [@5fc7b823](https://github.com/judge0/api/commit/5fc7b823a7bccecb148c57615da0be9d52f1585a)

## Other Changes
- Do not implicitly force wide open CORS settings when in development mode. I.e. variable `ALLOW_ORIGIN` can now also be used in development mode.
    - Commits: [@a3a24c5c](https://github.com/judge0/api/commit/a3a24c5c6fab31ab845905b7120146b18bfe7dbb)
- Removed output of configuration settings when server or worker starts.
    - Commits: [@7061de7a](https://github.com/judge0/api/commit/7061de7a69ffb07b335e44f7120619558a6cf79d)
- Updated all the gems except Rails to the latest versions.
    - Commits: [@230c7a77](https://github.com/judge0/api/commit/230c7a777edf96d6d8848618c15c239134d1f29b) [@69a9fe11](https://github.com/judge0/api/commit/69a9fe1193fb437e103a56b9691196e3687e5e7e) [@095588e6](https://github.com/judge0/api/commit/095588e6642211a123e5091227271de27fc700d5)
- Changed default value of `enable_per_process_and_thread_memory_limit` to `false`.
    - Commits: [@4116b9cb](https://github.com/judge0/api/commit/4116b9cb988816cad81f6b5c3265da01a8cec120)
- Don't show total number of workers in `/workers` that is determined with configuration variable `COUNT` because that number is not relevant.
    - Commits: [@99939b89](https://github.com/judge0/api/commit/99939b89a58d21fc7c6a43fcec90550f75681e39)
- Changed the default port to `80` in Docker Compose file.
    - Commits: [@6ab67d6b](https://github.com/judge0/api/commit/6ab67d6b1e723ce1e959dd17c899605c340bc6ed)
- Limited the log size to 100 MB in Docker Compose file.
    - Commits: [@435c7d79](https://github.com/judge0/api/commit/435c7d792babfda8564dd432d31d4edc5a694ab9)
- Added logging to `run-workers` script.
    - Commits: [@381265a2](https://github.com/judge0/api/commit/381265a295c130c54d540641ba071a18447d8223)
- Updated dummy client default values.
- Added Docker Compose file for HTTPS support.
- Refactored all development and production scripts from `scripts` directory.
- Refactored `judge0-api.conf` file.

## Deployment Procedure
### With HTTPS (SSL/TLS)
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.6.0/judge0-api-v1.6.0-https.zip
unzip judge0-api-v1.6.0-https.zip
```

3. Change directory to `judge0-api-v1.6.0-https`:
```
cd judge0-api-v1.6.0-https
```
4. Edit `docker-compose.yml` and change variables `VIRTUAL_HOST`, `LETSENCRYPT_HOST` and `LETSENCRYPT_EMAIL`.
5. Run all services and wait few seconds until everything is initialized:
```
docker-compose up -d db redis nginx letsencrypt
sleep 10s
docker-compose up -d
sleep 5s
```

6. Your instance of Judge0 API v1.6.0 is now available at `https://<YOUR DOMAIN>`.

### With HTTP
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.6.0/judge0-api-v1.6.0.zip
unzip judge0-api-v1.6.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.6.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 API v1.6.0 is now available at `http://<IP ADDRESS OF YOUR SERVER>`.


# v1.5.0 (2020-01-01)
## New Features
- Added **30 new languages**, archived 42 languages and kept active 2 languages from the last release. In total, there are now **32 active languages** that can be used and all are updated to their latest versions as of the date of this release.  Archived languages cannot be used anymore. Following table shows a status of every language that API supports.
    - Issues: [#51](https://github.com/judge0/api/issues/51) [#90](https://github.com/judge0/api/issues/90) [#106](https://github.com/judge0/api/issues/106) [#131](https://github.com/judge0/api/issues/131)
    - Commits: [@f86a546c](https://github.com/judge0/api/commit/f86a546cb9c90eeaedf08862d2a2a2a76293a87f)

|ID|Name|Status|
|---|---|---|
|1|Bash (4.4)|archived|
|2|Bash (4.0)|archived|
|3|Basic (fbc 1.05.0)|archived|
|4|C (gcc 7.2.0)|archived|
|5|C (gcc 6.4.0)|archived|
|6|C (gcc 6.3.0)|archived|
|7|C (gcc 5.4.0)|archived|
|8|C (gcc 4.9.4)|archived|
|9|C (gcc 4.8.5)|archived|
|10|C++ (g++ 7.2.0)|archived|
|11|C++ (g++ 6.4.0)|archived|
|12|C++ (g++ 6.3.0)|archived|
|13|C++ (g++ 5.4.0)|archived|
|14|C++ (g++ 4.9.4)|archived|
|15|C++ (g++ 4.8.5)|archived|
|16|C# (mono 5.4.0.167)|archived|
|17|C# (mono 5.2.0.224)|archived|
|18|Clojure (1.8.0)|archived|
|19|Crystal (0.23.1)|archived|
|20|Elixir (1.5.1)|archived|
|21|Erlang (OTP 20.0)|archived|
|22|Go (1.9)|archived|
|23|Haskell (ghc 8.2.1)|archived|
|24|Haskell (ghc 8.0.2)|archived|
|25|Insect (5.0.0)|archived|
|26|Java (OpenJDK 9 with Eclipse OpenJ9)|archived|
|27|Java (OpenJDK 8)|archived|
|28|Java (OpenJDK 7)|archived|
|29|JavaScript (nodejs 8.5.0)|archived|
|30|JavaScript (nodejs 7.10.1)|archived|
|31|OCaml (4.05.0)|archived|
|32|Octave (4.2.0)|archived|
|33|Pascal (fpc 3.0.0)|archived|
|34|Python (3.6.0)|archived|
|35|Python (3.5.3)|archived|
|36|Python (2.7.9)|archived|
|37|Python (2.6.9)|archived|
|38|Ruby (2.4.0)|archived|
|39|Ruby (2.3.3)|archived|
|40|Ruby (2.2.6)|archived|
|41|Ruby (2.1.9)|archived|
|42|Rust (1.20.0)|archived|
|43|Plain Text|Renamed from `Text (plain text)`.|
|44|Executable|Not changed.|
|45|Assembly (NASM 2.14.02)|**NEW**|
|46|Bash (5.0.0)|**NEW**|
|47|Basic (FBC 1.07.1)|**NEW**|
|48|C (GCC 7.4.0)|**NEW**|
|49|C (GCC 8.3.0)|**NEW**|
|50|C (GCC 9.2.0)|**NEW**|
|51|C# (Mono 6.6.0.161)|**NEW**|
|52|C++ (GCC 7.4.0)|**NEW**|
|53|C++ (GCC 8.3.0)|**NEW**|
|54|C++ (GCC 9.2.0)|**NEW**|
|55|Common Lisp (SBCL 2.0.0)|**NEW**|
|56|D (DMD 2.089.1)|**NEW**|
|57|Elixir (1.9.4)|**NEW**|
|58|Erlang (OTP 22.2)|**NEW**|
|59|Fortran (GFortran 9.2.0)|**NEW**|
|60|Go (1.13.5)|**NEW**|
|61|Haskell (GHC 8.8.1)|**NEW**|
|62|Java (OpenJDK 13.0.1)|**NEW**|
|63|JavaScript (Node.js 12.14.0)|**NEW**|
|64|Lua (5.3.5)|**NEW**|
|65|OCaml (4.09.0)|**NEW**|
|66|Octave (5.1.0)|**NEW**|
|67|Pascal (FPC 3.0.4)|**NEW**|
|68|PHP (7.4.1)|**NEW**|
|69|Prolog (GNU Prolog 1.4.5)|**NEW**|
|70|Python (2.7.17)|**NEW**|
|71|Python (3.8.1)|**NEW**|
|72|Ruby (2.7.0)|**NEW**|
|73|Rust (1.40.0)|**NEW**|
|74|TypeScript (3.7.4)|**NEW**|

- Added route `GET /languages/:id` for getting all attributes of specified language.
    - Commits: [@2a31e963](https://github.com/judge0/api/commit/2a31e96326651b90b59403d811ae48445fa4202e)
- Added route `GET /languages/all` for getting a list of all languages (archived and active).
    - Commits: [@2a31e963](https://github.com/judge0/api/commit/2a31e96326651b90b59403d811ae48445fa4202e)
- Added route `DELETE /submissions/:token` for deleting specified submission. Only authorized requests (users) are allowed to delete a submission.
    - Commits: [@3365e3c8](https://github.com/judge0/api/commit/3365e3c8da28bd273dbd7a21417e75fe393d83ee)
- Added configuration variable `ENABLE_SUBMISSION_DELETE` with default value set to `false`. By default you cannot delete a submission as long as this variable is set to `false`. When set to `true` then only authorized requests (users) can delete specific submission.
    - Commits: [@79e1de95](https://github.com/judge0/api/commit/79e1de95a4a6d2e022af557b96056b009a90be5e)
- Added info routes `GET /about`, `GET /version`, `GET /license` and `GET /isolate`. Last route `GET /isolate` returns result from [`isolate --version`](https://github.com/ioi/isolate) command.
    - Commits: [@9f5202a5](https://github.com/judge0/api/commit/9f5202a501f8cc2375be68908c6fbd0249ac3dd1)

## Improvements
- Updated base image to `judge0/api-base:1.0.0` which uses [Debian "buster"](https://www.debian.org/releases/buster/) and has installed Ruby 2.7.0.
    - Issues: [#113](https://github.com/judge0/api/issues/113)
    - Commits: [@f86a546c](https://github.com/judge0/api/commit/f86a546cb9c90eeaedf08862d2a2a2a76293a87f)
- Improved handling of an server error when one or more submission attributes cannot be serialized to JSON without Base64 encoding. User now gets an error with instructions to use `base64_encoded=true` query parameter.
    - Issues: [#107](https://github.com/judge0/api/issues/107) [#129](https://github.com/judge0/api/issues/129) [#130](https://github.com/judge0/api/issues/130)
    - Commits: [@cdcaa512](https://github.com/judge0/api/commit/cdcaa5122f96c90c0a9fcd16273a808c0ff06d4e)

## Bug Fixes
- Fixed example in configuration for using `ALLOW_ORIGIN` variable with multiple origins.
    - Commits: [@21d0202a](https://github.com/judge0/api/commit/21d0202ae16aa2e92853d146ba8fedb0c6bb6ab2)
- Fixed a bug where value of `MAX_MAX_PROCESSES_AND_OR_THREADS` was used as default value for `max_processes_and_or_threads` attribute of submission, whereas `MAX_PROCESSES_AND_OR_THREADS` should be used.
    - Commits: [@563f8ea2](https://github.com/judge0/api/commit/563f8ea264dad9396b4e7743cef187c785cbee67)

## Other Changes
- Increased maximum allowed `compiler_options` and `command_line_arguments` length to 512 characters.
    - Issues: [#122](https://github.com/judge0/api/issues/122)
    - Commits: [@3d4df3bf](https://github.com/judge0/api/commit/3d4df3bfe661ddff9ee7e6c015fa4403baf8be85)
- Increased default value of `MAX_PROCESSES_AND_OR_THREADS` to 60.
    - Commits: [@563f8ea2](https://github.com/judge0/api/commit/563f8ea264dad9396b4e7743cef187c785cbee67)
- Increased default value of `MAX_MAX_PROCESSES_AND_OR_THREADS` to 120.
    - Commits: [@563f8ea2](https://github.com/judge0/api/commit/563f8ea264dad9396b4e7743cef187c785cbee67)
- Changed default value of `RAILS_ENV` to `production`.
    - Commits: [@be55ca65](https://github.com/judge0/api/commit/be55ca656b524c5e99e75bd6d6207c4a078f5689)
- Changed default value of `INTERVAL` to 0.1.
    - Commits: [@be55ca65](https://github.com/judge0/api/commit/be55ca656b524c5e99e75bd6d6207c4a078f5689)
- Updated year in LICENSE.
    - Commits: [@679fb2ba](https://github.com/judge0/api/commit/679fb2bad981a22dcaebdd63baff506678b36939)
- Added environment variables `JUDGE0_{HOMEPAGE,SOURCE_CODE,MAINTAINER,VERSION}`. Isolate sandbox inherits these variables and they are now available for use in user code.
    - Commits: [@9f5202a5](https://github.com/judge0/api/commit/9f5202a501f8cc2375be68908c6fbd0249ac3dd1)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.5.0/judge0-api-v1.5.0.zip
unzip judge0-api-v1.5.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.5.0
docker-compose up -d db redis
sleep 10s
docker-compose up -d
sleep 5s
```

4. Your instance of Judge0 API v1.5.0 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.4.0 (2019-10-31)
## New Features
- Added support for `compiler_options` and `command_line_arguments`.
- Added configuration variables `ENABLE_COMPILER_OPTIONS`, `ALLOWED_LANGUAGES_FOR_COMPILER_OPTIONS` and `ENABLE_COMMAND_LINE_ARGUMENTS` for controlling usage of compiler options and command line arguments.

## Security Improvements
- Run compilation process for compiled languages inside sandbox and use values of *limit configuration variables* for controlling sandbox resources.
- Move application location from `/usr/src/api` to `/api` to prevent untrusted code from reading it.
    - Commits: [@0f1b07fe](https://github.com/judge0/api/commit/0f1b07fe0f75141ec82431ef28ad939d73e418a3)

## Other Changes
- Don't link math library for C language by default. You now need to send `-lm` in `compiler_options`.
    - Commits: [@619a3bbe](https://github.com/judge0/api/commit/619a3bbed204b22c71e012f0de0faabf6f846d70)


## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.4.0/judge0-api-v1.4.0.zip
unzip judge0-api-v1.4.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.4.0
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.4.0 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.3.1 (2019-09-16)
## Improvements
- Improved handling exec format error by introducing new status **Exec Format Error**.
    - Commits: [@93a60115](https://github.com/judge0/api/commit/93a601159187d67d1ca52e8c06ebecd8318ed6c3)

## Bug Fixes
- Fixed bug where execution of Go code with no `main` package would induce `execve("./main"): No such file or directory` because Go compiler wouldn't create `main` binary.
    - Commits: [@93a60115](https://github.com/judge0/api/commit/93a601159187d67d1ca52e8c06ebecd8318ed6c3)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.3.1/judge0-api-v1.3.1.zip
unzip judge0-api-v1.3.1.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.3.1
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.3.1 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.3.0 (2019-09-15)
## New Features
- Added `MAX_QUEUE_SIZE` variable that defines a maximum submission queue size. If there is a new submission request and the queue is full, then that submission will be rejected.
    - Commits: [@a2bcdecb](https://github.com/judge0/api/commit/a2bcdecbb99dbd8d3875e2f95bdf71f12e34f495)

## Improvements
- Improved worker shutdown procedure. Workers are now gracefully shutdown on `docker stop`.
    - Commits: [@2ae0cd31](https://github.com/judge0/api/commit/2ae0cd31153dca4218638096d390ee6f84896236)

## Bug Fixes
- Fixed a bug where authentication token was auto converted to integer.
    - Issues: [#101](https://github.com/judge0/api/issues/101)
    - Commits: [@b92c4970](https://github.com/judge0/api/commit/b92c49705c687e955f91dc6638015f14bbcad97c)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.3.0/judge0-api-v1.3.0.zip
unzip judge0-api-v1.3.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.3.0
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.3.0 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.2.2 (2019-09-07)
## Securty Fixes
- Fixed a bug that allowed anybody to read `judge0-api.conf` file. This bug was introduced in version [v1.2.1](https://github.com/judge0/api/releases/tag/v1.2.1) when config was mounted into container. With this fix, config is still mounted into container but not in `/usr/src/api` folder but rather in `/`. Root folder is not binded in isolate sandbox, whereas `/usr/src/api` is.
  - Commits: [@121c8f9d](https://github.com/judge0/api/commit/121c8f9de8d89b45c5fec69266d625b375e3181e)

## Other Changes
- Don't allow execution of scripts in `/usr/src/api` folder.
  - Commits: [@121c8f9d](https://github.com/judge0/api/commit/121c8f9de8d89b45c5fec69266d625b375e3181e)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.2.2/judge0-api-v1.2.2.zip
unzip judge0-api-v1.2.2.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.2.2
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.2.2 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.2.1 (2019-08-24)
## Improvements
- Improved config loading. Config can now be changed and reload just with `docker-compose restart` command.
  - Commits: [@06fc37f1](https://github.com/judge0/api/commit/06fc37f16571840e87c41658807da20a08358926)

## Bug Fixes
- Fixed bug in `run-worker` script that didn't consider `COUNT` config variable.
  - Issues: [#91](https://github.com/judge0/api/issues/91)
  - Commits: [@06fc37f1](https://github.com/judge0/api/commit/06fc37f16571840e87c41658807da20a08358926)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.2.1/judge0-api-v1.2.1.zip
unzip judge0-api-v1.2.1.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.2.1
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.2.1 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.2.0-nim0.20.0 (2019-06-26)
This image contains only [The Nim Programming Language](https://nim-lang.org). Free public instance of this image is available on https://nim.api.judge0.com.

This image was build for the purpose of creating dedicated web playground for this language, and in the future I will add and deploy every new release of it. In the [`nim`](https://github.com/judge0/api-base/tree/nim) branch of Judge0 API Base I will follow and install new releases of Nim, and in the [`nim`](https://github.com/judge0/api/tree/nim) branch of Judge0 API I will maintain a Judge0 API that only has Nim available.

Free playground for the Nim programming language that uses Judge0 API is available at https://nim.ide.judge0.com.

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.2.0-nim0.20.0/judge0-api-v1.2.0-nim0.20.0.zip
unzip judge0-api-v1.2.0-nim0.20.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.2.0-nim0.20.0
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.2.0-nim0.20.0 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.2.0-vlang0.1.3 (2019-06-26)
This image contains only [The V Programming Language](https://vlang.io), specifically only V compiler built from commit [@b00a47be](https://github.com/vlang/v/commit/b00a47be66e868b087146feb7999fd72f2af3da0). Free public instance of this image is available on https://vlang.api.judge0.com.

This image was build for the purpose of creating dedicated web playground for this new programming language, and in the future I will add and deploy every new release of it. In the [`vlang`](https://github.com/judge0/api-base/tree/vlang) branch of Judge0 API Base I will follow and install new releases of V, and in the [`vlang`](https://github.com/judge0/api/tree/vlang) branch of Judge0 API I will maintain a Judge0 API that only has V available.

Free playground for the V programming language that uses Judge0 API is available at https://vlang.ide.judge0.com.

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.2.0-vlang0.1.3/judge0-api-v1.2.0-vlang0.1.3.zip
unzip judge0-api-v1.2.0-vlang0.1.3.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.2.0-vlang0.1.3
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.2.0-vlang0.1.3 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.2.0 (2019-06-17)
## New Features
- Added new language **Executable** that allows executing custom executable files.
  - Commits: [@0ab08351](https://github.com/judge0/api/commit/0ab08351f59ae75d9626b6941be3728b48e835db)
- Added new configuration variables: `REDIS_PASSWORD`, `REDIS_PORT` and `POSTGRES_PORT`.
  - Commits: [@962d7d1d](https://github.com/judge0/api/commit/962d7d1dcff051357de492f2d31e996405b1d125)

## Improvements
- Improved `run-server` and `run-worker` scripts.
  - Commits: [@e1b3564b](https://github.com/judge0/api/commit/e1b3564b5f262c610c42a45879e313eca93e720f)

## Bug Fixes
- Fixed `/etc/apt/sources.list` that prevented package update.
  - Issues: [#84](https://github.com/judge0/api/issues/84)
  - Commits: [@7fdca3cf](https://github.com/judge0/api/commit/7fdca3cfa5f3bddefbe2ae1e12a18ba18a7e5f63)
- Fixed cleanup bug that didn't remove sandbox files if `tmp` directory was not empty.
  - Commits: [@50ee4dbf](https://github.com/judge0/api/commit/50ee4dbf841bc9d0ce195380aaa1c5ee957ee2b7)
- Fixed another UTF-8 problem with Python that @nguyenvanquan7826 reported.
  - Issues: [#69](https://github.com/judge0/api/issues/69)
  - Commits: [@64635c98](https://github.com/judge0/api/commit/64635c98f7c0475e33b9b4629a6da8bc20fff60a)

## Other Changes
- Updated some gems that had security issues.
  - Pull Requests: [#77](https://github.com/judge0/api/pull/77) [#78](https://github.com/judge0/api/pull/78) [#79](https://github.com/judge0/api/pull/79) [#80](https://github.com/judge0/api/pull/80) [#81](https://github.com/judge0/api/pull/81) [#82](https://github.com/judge0/api/pull/82)
  - Commits: [@e1b3564b](https://github.com/judge0/api/commit/e1b3564b5f262c610c42a45879e313eca93e720f)
- Prepared Isolate Job for accepting custom compile flags.
  - Commits: [@4f2dde1f](https://github.com/judge0/api/commit/4f2dde1f79e32545da219de5cea7c5aaf25869cb)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.2.0/judge0-api-v1.2.0.zip
unzip judge0-api-v1.2.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.2.0
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.2.0 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.5-python3.6.8 (2019-03-08)
On @guvenim [request](https://github.com/judge0/api/issues/67) I have built an Judge0 API image that contains just Python 3.6.8. This release also shows what changes are necessary in [api-base](https://github.com/judge0/api-base/commit/bfde9426e4a3d44098dab2a2d082e02de2bc5be5) and [api](https://github.com/judge0/api/commit/9f9f5cd0577a724d66be934c11d2e57b2b3fc705) when you only want to use languages that you need.

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.5-python3.6.8/judge0-api-v1.1.5-python3.6.8.zip
unzip judge0-api-v1.1.5-python3.6.8.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.5-python3.6.8
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.5-python3.6.8 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.5 (2019-02-17)
## Bug Fixes
- Fixed problem with assigning compile output to submission when rerunning submission.
  - Commits: [@c3cd0232](https://github.com/judge0/api/commit/c3cd023258a4ec48949d4ee2310bc39a2f40cac9)

## Other Changes
- Remove unwanted newlines from compile output.
  - Commits: [@c3cd0232](https://github.com/judge0/api/commit/c3cd023258a4ec48949d4ee2310bc39a2f40cac9)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.5/judge0-api-v1.1.5.zip
unzip judge0-api-v1.1.5.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.5
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.5 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.4 (2019-02-17)
## Bug Fixes
- Fixed problem with assigning compile output to submission when compile output is not empty.
  - Commits: [@22403707](https://github.com/judge0/api/commit/224037078325dfe02f5fbf191a55513582ca84b5)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.4/judge0-api-v1.1.4.zip
unzip judge0-api-v1.1.4.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.4
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.4 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.3 (2019-02-15)
## Improvements
- Improved cleanup of sandbox by deleting stdin, stdout, stderr and meta file before running isolate cleanup.
  - Commits: [@1dcfaf98](https://github.com/judge0/api/commit/1dcfaf98536fc55fe200c57de10540de64936654)

## Bug Fixes
- Fixed problem with compile output that contained invalid byte sequence in UTF-8.
  - Commits: [@37d46b14](https://github.com/judge0/api/commit/37d46b140c75aaafeca35ffc36e53746e0905387)
- Fixed problem with submissions not changing their post-run attributes after rerun if compile error occured.
  - Commits: [@37d46b14](https://github.com/judge0/api/commit/37d46b140c75aaafeca35ffc36e53746e0905387)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.3/judge0-api-v1.1.3.zip
unzip judge0-api-v1.1.3.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.3
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.3 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.2 (2019-02-15)
## Improvements
- Improved reading from stdin and writing to stdout, stderr and meta. They are now not available in sandbox.
  - Commits: [@1f135c1a](https://github.com/judge0/api/commit/1f135c1a53f5039b52de5e9c78764c80a7ed3945) [@350ff3a4](https://github.com/judge0/api/commit/350ff3a4705b6d83ef4f1188de52586cbb87e693)

## Bug Fixes
- Fixed writing of source code and stdin to disc, they are now written as binary files to avoid UTF-8 problems.
  - Commits: [@519efbea](https://github.com/judge0/api/commit/519efbea1548f9dab5a95032af2cfa88fc319c65)
- Fixed problem with stripping output that contained invalid byte sequence in UTF-8.
  - Commits: [@4c994c67](https://github.com/judge0/api/commit/4c994c67630d6679a636a656ba0041ba6a680219)

## Other Changes
- Use `judge0/api-base:0.3.0` as base image which uses [isolate@18554e83](https://github.com/ioi/isolate/commit/18554e83793508acd1032d0cf4229a332c43085e).
  - Commits: [@350ff3a4](https://github.com/judge0/api/commit/350ff3a4705b6d83ef4f1188de52586cbb87e693)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.2/judge0-api-v1.1.2.zip
unzip judge0-api-v1.1.2.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.2
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.2 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.1 (2019-02-13)
## Bug Fixes
- Fixed a problem when `strip` method was called on a `nil` class when expected output was `nil`.
  - Commits: [@b25153e9](https://github.com/judge0/api/commit/b25153e9450569c995e8f3afe036fed4ad58726c)

## Other Changes
- Don't let worker update submission's `finished_at` attribute if it already exists. This allows Judge0 API administrators to manually rerun submissions from command line and preserve initial timestamps if some unexpected error occured.
  - Commits: [@b25153e9](https://github.com/judge0/api/commit/b25153e9450569c995e8f3afe036fed4ad58726c)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.1/judge0-api-v1.1.1.zip
unzip judge0-api-v1.1.1.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.1
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.1.1 is now available at `http://<IP OF YOUR SERVER>:3000`.


# v1.1.0 (2019-02-10)
## New Features
- Added `-lm` compile flag to link with math library when compiling C source code.
  - Pull Requests: [#60](https://github.com/judge0/api/pull/60)
- Added fixed time limit of 10 seconds for compilation.
  - Issues: [#63](https://github.com/judge0/api/issues/63) [#64](https://github.com/judge0/api/issues/64)
  - Commits: [@2f05ce2c](https://github.com/judge0/api/commit/2f05ce2c9305fccaeb0c08e23d645736593d787e)

## Improvements
- Improved procedure of seeding database with languages. Seeding is now idempotent.
  - Commits: [@72cff961](https://github.com/judge0/api/commit/72cff9616db20bed128a38111e3c28dbfc75696e)

## Bux Fixes
- Fixed versions of Postgres and Redis in Docker Compose files.
  - Issues: [#20](https://github.com/judge0/api/issues/20) [#38](https://github.com/judge0/api/issues/38) [#40](https://github.com/judge0/api/issues/40) [#45](https://github.com/judge0/api/issues/45) [#47](https://github.com/judge0/api/issues/47) [#56](https://github.com/judge0/api/issues/56) [#57](https://github.com/judge0/api/issues/57)
  - Commits: [@80a61629](https://github.com/judge0/api/commit/80a61629129af75e1d8a4bb167b349ab34cabfd3) [@90ec40cf](https://github.com/judge0/api/commit/90ec40cf5b4dc2ca6aa4c3af59326d431530cf80)
- Fixed problem with workers stopping when they lost connection with Postgres or Redis.
  - Commits: [@eee340b6](https://github.com/judge0/api/commit/eee340b650aeacc7971ce5e73652a7bfa9e243af)
- Fixed problem of storing submission's stdout and stderr that contained invalid byte sequence in UTF-8.
  - Commits: [@ff63c1bc](https://github.com/judge0/api/commit/ff63c1bc498a62101d4c074f5aa7b7a971550164)

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.1.0/judge0-api-v1.1.0.zip
unzip judge0-api-v1.1.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.1.0
docker-compose up -d
sleep 10s
```


# v1.0.0 (2017-10-01)
This is the first production ready release of Judge0 API.

## Deployment Procedure
1. Install [Docker](https://docs.docker.com) and [Docker Compose](https://docs.docker.com/compose).
2. Download and extract release archive:
```
wget https://github.com/judge0/api/releases/download/v1.0.0/judge0-api-v1.0.0.zip
unzip judge0-api-v1.0.0.zip
```

3. Run all services and wait few seconds until everything is initialized:
```
cd judge0-api-v1.0.0
docker-compose up -d
sleep 10s
```

4. Your instance of Judge0 API v1.0.0 is now available at `http://<IP OF YOUR SERVER>:3000`.