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https://github.com/overleaf/clsi

A web api for compiling LaTeX documents in the cloud
https://github.com/overleaf/clsi

Last synced: 24 days ago
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A web api for compiling LaTeX documents in the cloud

Host: GitHub
URL: https://github.com/overleaf/clsi
Owner: overleaf
License: agpl-3.0
Archived: true
Created: 2014-02-12T17:29:04.000Z (almost 11 years ago)
Default Branch: master
Last Pushed: 2021-12-16T16:35:03.000Z (about 3 years ago)
Last Synced: 2024-08-10T14:08:43.605Z (4 months ago)
Language: JavaScript
Size: 4.23 MB
Stars: 197
Watchers: 34
Forks: 56
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

⚠️ This repository has been migrated into [`overleaf/overleaf`](https://github.com/overleaf/overleaf). See the [monorepo announcement](https://github.com/overleaf/overleaf/issues/923) for more info. ⚠️

---

overleaf/clsi
===============

A web api for compiling LaTeX documents in the cloud

The Common LaTeX Service Interface (CLSI) provides a RESTful interface to traditional LaTeX tools (or, more generally, any command line tool for composing marked-up documents into a display format such as PDF or HTML). The CLSI listens on the following ports by default:

* TCP/3013 - the RESTful interface
* TCP/3048 - reports load information
* TCP/3049 - HTTP interface to control the CLSI service

These defaults can be modified in `config/settings.defaults.js`.

The provided `Dockerfile` builds a Docker image which has the Docker command line tools installed. The configuration in `docker-compose-config.yml` mounts the Docker socket, in order that the CLSI container can talk to the Docker host it is running in. This allows it to spin up `sibling containers` running an image with a TeX distribution installed to perform the actual compiles.

The CLSI can be configured through the following environment variables:

* `ALLOWED_COMPILE_GROUPS` - Space separated list of allowed compile groups
* `ALLOWED_IMAGES` - Space separated list of allowed Docker TeX Live images
* `CATCH_ERRORS` - Set to `true` to log uncaught exceptions
* `COMPILE_GROUP_DOCKER_CONFIGS` - JSON string of Docker configs for compile groups
* `COMPILES_HOST_DIR` - Working directory for LaTeX compiles
* `COMPILE_SIZE_LIMIT` - Sets the body-parser [limit](https://github.com/expressjs/body-parser#limit)
* `DOCKER_RUNNER` - Set to true to use sibling containers
* `DOCKER_RUNTIME` -
* `FILESTORE_DOMAIN_OVERRIDE` - The url for the filestore service e.g.`http://$FILESTORE_HOST:3009`
* `FILESTORE_PARALLEL_FILE_DOWNLOADS` - Number of parallel file downloads
* `FILESTORE_PARALLEL_SQL_QUERY_LIMIT` - Number of parallel SQL queries
* `LISTEN_ADDRESS` - The address for the RESTful service to listen on. Set to `0.0.0.0` to listen on all network interfaces
* `PROCESS_LIFE_SPAN_LIMIT_MS` - Process life span limit in milliseconds
* `SENTRY_DSN` - Sentry [Data Source Name](https://docs.sentry.io/product/sentry-basics/dsn-explainer/)
* `SMOKE_TEST` - Whether to run smoke tests
* `SQLITE_PATH` - Path to SQLite database
* `SYNCTEX_BIN_HOST_PATH` - Path to SyncTeX binary
* `TEXLIVE_IMAGE` - The TeX Live Docker image to use for sibling containers, e.g. `gcr.io/overleaf-ops/texlive-full:2017.1`
* `TEX_LIVE_IMAGE_NAME_OVERRIDE` - The name of the registry for the Docker image e.g. `gcr.io/overleaf-ops`
* `TEXLIVE_IMAGE_USER` - When using sibling containers, the user to run as in the TeX Live image. Defaults to `tex`
* `TEXLIVE_OPENOUT_ANY` - Sets the `openout_any` environment variable for TeX Live (see the `\openout` primitive [documentation](http://tug.org/texinfohtml/web2c.html#tex-invocation))

Further environment variables configure the [metrics module](https://github.com/overleaf/metrics-module)

Installation
------------

The CLSI can be installed and set up as part of the entire [Overleaf stack](https://github.com/overleaf/overleaf) (complete with front end editor and document storage), or it can be run as a standalone service. To run is as a standalone service, first checkout this repository:

$ git clone [email protected]:overleaf/clsi.git

Then build the Docker image:

$ docker build . -t overleaf/clsi

Then pull the TeX Live image:

$ docker pull texlive/texlive

Then start the Docker container:

$ docker run --rm \
-p 127.0.0.1:3013:3013 \
-e LISTEN_ADDRESS=0.0.0.0 \
-e DOCKER_RUNNER=true \
-e TEXLIVE_IMAGE=texlive/texlive \
-e TEXLIVE_IMAGE_USER=root \
-e COMPILES_HOST_DIR="$PWD/compiles" \
-v "$PWD/compiles:/app/compiles" \
-v "$PWD/cache:/app/cache" \
-v /var/run/docker.sock:/var/run/docker.sock \
--name clsi \
overleaf/clsi

Note: if you're running the CLSI in macOS you may need to use `-v /var/run/docker.sock.raw:/var/run/docker.sock` instead.

The CLSI should then be running at

Important note for Linux users
==============================

The Node application runs as user `node` in the CLSI, which has uid `1000`. As a consequence of this, the `compiles` folder gets created on your host with `uid` and `gid` set to `1000`.
```
ls -lnd compiles
drwxr-xr-x 2 1000 1000 4096 Mar 19 12:41 compiles
```

If there is a user/group on your host which also happens to have `uid` / `gid` `1000` then that user/group will have ownership of the compiles folder on your host.

LaTeX runs in the sibling containers as the user specified in the `TEXLIVE_IMAGE_USER` environment variable. In the example above this is set to `root`, which has uid `0`. This creates a problem with the above permissions, as the root user does not have permission to write to subfolders of `compiles`.

A quick fix is to give the `root` group ownership and read write permissions to `compiles`, with `setgid` set so that new subfolders also inherit this ownership:
```
sudo chown -R 1000:root compiles
sudo chmod -R g+w compiles
sudo chmod g+s compiles
```
Another solution is to create a `sharelatex` group and add both `root` and the user with `uid` `1000` to it. If the host does not have a user with that `uid`, you will need to create one first.
```
sudo useradd --uid 1000 host-node-user # If required
sudo groupadd sharelatex
sudo usermod -a -G sharelatex root
sudo usermod -a -G sharelatex $(id -nu 1000)
sudo chown -R 1000:sharelatex compiles
sudo chmod -R g+w compiles
sudo chmod g+s compiles
```

This is a facet of the way docker works on Linux. See this [upstream issue](https://github.com/moby/moby/issues/7198)

Config
------

The CLSI will use a SQLite database by default, but you can optionally set up a MySQL database and then fill in the database name, username and password in the config file at `config/settings.development.js`.

API
---

The CLSI is based on a JSON API.

#### Example Request

(Note that valid JSON should not contain any comments like the example below).

POST /project//compile

```json5
{
"compile": {
"options": {
// Which compiler to use. Can be latex, pdflatex, xelatex or lualatex
"compiler": "lualatex",
// How many seconds to wait before killing the process. Default is 60.
"timeout": 40
},
// The main file to run LaTeX on
"rootResourcePath": "main.tex",
// An array of files to include in the compilation. May have either the content
// passed directly, or a URL where it can be downloaded.
"resources": [
{
"path": "main.tex",
"content": "\\documentclass{article}\n\\begin{document}\nHello World\n\\end{document}"
}
// ,{
// "path": "image.png",
// "url": "www.example.com/image.png",
// "modified": 123456789 // Unix time since epoch
// }
]
}
}
```

With `curl`, if you place the above JSON in a file called `data.json`, the request would look like this:

``` shell
$ curl -X POST -H 'Content-Type: application/json' -d @data.json http://localhost:3013/project//compile
```

You can specify any project-id in the URL, and the files and LaTeX environment will be persisted between requests.
URLs will be downloaded and cached until provided with a more recent modified date.

#### Example Response

```json
{
"compile": {
"status": "success",
"outputFiles": [{
"type": "pdf",
"url": "http://localhost:3013/project//output/output.pdf"
}, {
"type": "log",
"url": "http://localhost:3013/project//output/output.log"
}]
}
}
```

License
-------

The code in this repository is released under the GNU AFFERO GENERAL PUBLIC LICENSE, version 3. A copy can be found in the `LICENSE` file.