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143 Stars 23 Forks Mozilla Public License 2.0 1.2K Commits 95 Opened issues


Sync Storage server in Rust

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License: MPL 2.0 Build Status Connect to Matrix via the Riot webapp


Mozilla Sync Storage built with Rust.

System Requirements

  • cmake
  • gcc
  • golang
  • libcurl4-openssl-dev
  • libssl-dev
  • make
  • pkg-config
  • Rust stable
  • MySQL 5.7 (or compatible)
    • libmysqlclient (
      brew install mysql
      on macOS,
      apt install libmysqlclient-dev
      on Ubuntu,
      apt install libmariadb-dev-compat
      on Debian)

Depending on your OS, you may also need to install

, and
. Note: if the code complies cleanly, but generates a Segmentation Fault within Sentry init, you probably are missing

Local Setup

  1. Follow the instructions below to use either MySQL or Spanner as your DB.
  2. Now
    cp config/local.example.toml config/local.toml
    . Open
    and make sure you have the desired settings configured. For a complete list of available configuration options, check out docs/
  3. make run
    starts the server in debug mode, using your new
    file for config options. Or, simply
    cargo run
    with your own config options provided as env vars.
  4. Visit
    to make sure the server is running.


Durable sync needs only a valid mysql DSN in order to set up connections to a MySQL database. The database can be local and is usually specified with a DSN like:

mysql://_user_:[email protected]_host_/_database_

To setup a fresh MySQL DB and user: (

mysql -u root
CREATE USER "sample_user"@"localhost" IDENTIFIED BY "sample_password";
CREATE DATABASE syncstorage_rs;

GRANT ALL PRIVILEGES on syncstorage_rs.* to [email protected];


Spanner requires a key in order to access the database. It's important that you know which keys have access to the spanner database. Contact your administrator to find out. One you know the key, log into the Google Cloud Console Service Accounts page. Be sure to select the correct project.

  • Locate the email identifier of the access key and pick the vertical dot menu at the far right of the row.
  • Select "Create Key" from the pop-up menu.
  • Select "JSON" from the Dialog Box.

A proper key file will be downloaded to your local directory. It's important to safeguard that key file. For this example, we're going to name the file


The proper key file is in JSON format. An example file is provided below, with private information replaced by "

  "type": "service_account",
  "project_id": "...",
  "private_key_id": "...",
  "private_key": "...",
  "client_email": "...",
  "client_id": "...",
  "auth_uri": "",
  "token_uri": "",
  "auth_provider_x509_cert_url": "",
  "client_x509_cert_url": "..."

Note, that unlike MySQL, there is no automatic migrations facility. Currently Spanner schema must be hand edited and modified.

To point to a GCP hosted Spanner instance from your local machine, follow these steps:

  1. Download the key file as shown above.
  2. Open
    and replace
    with a link to your spanner instance.
  3. Open the Makefile and ensure you've correctly set you
  4. make run_spanner
  5. Visit
    to make sure the server is running.

Running via Docker

This requires access to the mozilla-rust-sdk which is now available at

  1. Make sure you have Docker installed locally.
  2. Copy the contents of mozilla-rust-sdk into top level root dir here.
  3. Change cargo.toml mozilla-rust-sdk entry to point to
    "path = "mozilla-rust-sdk/googleapis-raw"
    instead of the parent dir.
  4. Comment out the
    value under
    in docker-compose.yml, and add this instead:
        context: .
  5. Adjust the MySQL db credentials in docker-compose.yml to match your local setup.
  6. make docker_start
    - You can verify it's working by visiting localhost:8000/__heartbeat__

Connecting to Firefox

This will walk you through the steps to connect this project to your local copy of Firefox.

  1. Follow the steps outlined above for running this project using MySQL.

  2. Setup a local copy of syncserver, with a few special changes to syncserver.ini; make sure that you're using the following values (in addition to all of the other defaults):

    port = 5000

    [syncserver] public_url = http://localhost:5000/

    This value needs to match your "master_secret" for syncstorage-rs!


    [tokenserver] node_url = http://localhost:8000 sqluri = pymysql://sample_user:[email protected]/syncstorage_rs

    [endpoints] sync-1.5 = "http://localhost:8000/1.5/1"```

  1. In Firefox, go to
    . Change
  2. Restart Firefox. Now, try syncing. You should see new BSOs in your local MySQL instance.



  1. If you want to connect to the existing Sentry project for local development, login to Sentry, and go to the page with api keys. Copy the
  2. Comment out the
    line in your
  3. You can force an error to appear in Sentry by adding a
    into, just before the final
  4. Now,
  5. You may need to stop the local server after it hits the panic! before errors will appear in Sentry.


We use env_logger: set the

env var.


Unit tests

make test
- open the Makefile to adjust your
as needed.

Debugging unit test state

In some cases, it is useful to inspect the mysql state of a failed test. By default, we use the diesel testtransaction functionality to ensure test data is not committed to the database. Therefore, there is an environment variable which can be used to turn off testtransaction.

    SYNC_DATABASE_USE_TEST_TRANSACTIONS=false cargo test [testname]

Note that you will almost certainly want to pass a single test name. When running the entire test suite, data from previous tests will cause future tests to fail.

To reset the database state between test runs, drop and recreate the database in the mysql client:

    drop database syncstorage_rs; create database syncstorage_rs; use syncstorage_rs;

End-to-End tests

Functional tests live in server-syncstorage and can be run against a local server, e.g.:

  1. If you haven't already followed the instructions here to get all the dependencies for the server-syncstorage repo, you should start there.

  2. Install (Python) server-syncstorage:

     $ git clone
     $ cd server-syncstorage
     $ make build
  3. Run an instance of syncstorage-rs (

    cargo run
    in this repo).
  4. To run all tests:

     $ ./local/bin/python syncstorage/tests/functional/ http://localhost:8000#
  5. Individual tests can be specified via the

    env var:
    $ SYNC_TEST_PREFIX=test_get_collection \
        ./local/bin/python syncstorage/tests/functional/ http://localhost:8000#

Creating Releases

  1. Switch to master branch of syncstorage-rs
  2. git pull
    to ensure that the local copy is up-to-date.
  3. git pull origin master
    to make sure that you've incorporated any changes to the master branch.
  4. git diff origin/master
    to ensure that there are no local staged or uncommited changes.
  5. Bump the version number in Cargo.toml (this new version number will be designated as
     in this checklist)
  6. create a git branch for the new version
    git checkout -b release/
  7. cargo build --release
    - Build with the release profile release mode.
  8. clog -C
    - Generate release notes. We're using clog for release notes. Add a
    flag to denote major/minor/patch version, ie
    clog -C -p
  9. Review the
    file and ensure all relevant changes since the last tag are included.
  10. Create a new release in Sentry:
    VERSION={release-version-here} bash scripts/
    . If you're doing this for the first time, checkout the tips below for troubleshooting sentry cli access.
  11. git commit -am "chore: tag "
    to commit the new version and changes
  12. git tag -s -m "chore: tag " 
    to create a signed tag of the current HEAD commit for release.
  13. git push origin release/
    to push the commits to a new origin release branch
  14. git push --tags origin release/
    to push the tags to the release branch.
  15. Submit a Pull Request (PR) on github to merge the release branch to master.
  16. Go to the GitHub release, you should see the new tag with no release information.
  17. Click the
    Draft a new release
  18. Enter the <version> number for
    Tag version
  19. Copy and paste the most recent change set from
    into the release description, omitting the top 2 lines (the name and version)
  20. Once your PR merges, click [Publish Release] on the GitHub release page.

Sync server is automatically deployed to STAGE, however QA may need to be notified if testing is required. Once QA signs off, then a bug should be filed to promote the server to PRODUCTION.


  • rm Cargo.lock; cargo clean;
    - Try this if you're having problems compiling.
  • Some versions of OpenSSL 1.1.1 can conflict with grpcio's built in BoringSSL. These errors can cause syncstorage to fail to run or compile. If you see a problem related to

    you may need to specify the
    --features grpcio/openssl
    to force grpcio to use OpenSSL.


  • If you're having trouble working with Sentry to create releases, try authenticating using their self hosted server option that's outlined here Ie,
    sentry-cli --url login
    . It's also recommended to create a
    config file. See this example for the config values you'll need.

Related Documentation

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