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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 libgrpcdev, and protobuf-compiler-grpc. Note: if the code complies cleanly, but generates a Segmentation Fault within Sentry init, you probably are missing libcurl4-openssl-dev.

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 config/local.toml 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 local.toml file for config options. Or, simply cargo run with your own config options provided as env vars.
  4. Visit http://localhost:8000/__heartbeat__ 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:


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 sample_user@localhost;


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 service-account.json.

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 local.toml and replace database_url with a link to your spanner instance.
  3. Open the Makefile and ensure you've correctly set you PATH_TO_GRPC_CERT.
  4. make run_spanner.
  5. Visit http://localhost:8000/__heartbeat__ to make sure the server is running.

Running via Docker

This requires access to the mozilla-rust-sdk which is now available at /vendor/mozilla-rust-adk.

  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 image value under syncstorage-rs 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
    public_url = http://localhost:5000/
    # This value needs to match your "master_secret" for syncstorage-rs!
    node_url = http://localhost:8000
    sqluri = pymysql://sample_user:sample_password@
    sync-1.5 = "http://localhost:8000/1.5/1"```
  3. In Firefox, go to about:config. Change identity.sync.tokenserver.uri to http://localhost:5000/token/1.0/sync/1.5.

  4. 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 DSN value.
  2. Comment out the human_logs line in your config/local.toml file.
  3. You can force an error to appear in Sentry by adding a panic! into, just before the final Ok(()).
  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 RUST_LOG env var.


Unit tests

make test - open the Makefile to adjust your SYNC_DATABASE_URL 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 test_transaction functionality to ensure test data is not committed to the database. Therefore, there is an environment variable which can be used to turn off test_transaction.

    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#<SOMESECRET>
  5. Individual tests can be specified via the SYNC_TEST_PREFIX env var:

    $ SYNC_TEST_PREFIX=test_get_collection \
        ./local/bin/python syncstorage/tests/functional/ http://localhost:8000#<SOMESECRET>

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 <version> in this checklist)
  6. create a git branch for the new version git checkout -b release/<version>
  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 -p, -m or -M 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 <version>" to commit the new version and changes
  12. git tag -s -m "chore: tag <version>" <version> to create a signed tag of the current HEAD commit for release.
  13. git push origin release/<version> to push the commits to a new origin release branch
  14. git push --tags origin release/<version> 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 button.
  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 libssl you may need to specify the cargo option --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 .sentryclirc config file. See this example for the config values you'll need.

Related Documentation