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sqld - a server mode for libSQL

The sqld ("SQL daemon") project is a server mode for libSQL.

Embedded SQL databases such as libSQL and SQLite are great for a lot of use cases, but sometimes you really do want to consume your database as a server. For example, with apps running on serverless infrastructure, fitting a database engine might be difficult given the limited size of the hardware. And even when it's possible, it might be really inconvenient. We created sqld for this use case.

Features

  • SQLite dialect layered on top of HTTP.
  • SQLite-compatible API that you can drop-in with LD_PRELOAD in your application to switch from local database to a remote database.
  • Read replica support.
  • Integration with mvSQLite for high availability and fault tolerance.

Build and run

Follow the instructions to build and run sqld using Homebrew, Docker, or your own Rust toolchain.

Tests

Run the command below to run all tests for libsql and libsql-server.

cargo xtask test

Client libraries

The following client libraries enable your app to query sqld programmatically:

SQLite extensions support

Extensions must be preloaded at startup. To do that, add all of your extensions to a directory, and add a file called trusted.lst with the sha256sum of each file to that directory. For example:

$ cat trusted.lst
04cd193d2547ff99d672fbfc6dcd7e0b220869a1ab867a9bb325f7374d168533  vector0.so
74f9029cbf6e31b155c097a273e08517eb4e56f2300dede65c801407b01eb248  vss0.so
5bbbe0f80dd7721162157f852bd5f364348eb504f9799ae521f832d44c13a3a1  crypto.so
731a8cbe150351fed02944a00ca586fc60d8f3814e4f83efbe60fcef62d4332b  fuzzy.so
1dbe9e4e58c4b994a119f1b507d07eb7a4311a80b96482c979b3bc0defd485fb  math.so
511bf71b0621977bd9575d71e90adf6d02967008e460066a33aed8720957fecb  stats.so
ae7fff8412e4e66e7f22b9af620bd24074bc9c77da6746221a9aba9d2b38d6a6  text.so
9ed6e7f4738c2223e194c7a80525d87f323df269c04d155a769d733e0ab3b4d0  unicode.so
19106ded4fd3fd4986a5111433d062a73bcf9557e07fa6d9154e088523e02bb0  uuid.so

Extensions will be loaded in the order they appear on that file, so if there are dependencies between extensions make sure they are listed in the proper order.

Then start the server with the --extensions-path option pointing at the extension directory

Integration with S3 bottomless replication

sqld is integrated with bottomless replication subproject. With bottomless replication, the database state is continuously backed up to S3-compatible storage. Each backup session is called a "generation" and consists of the main database file snapshot and replicates SQLite WAL pages.

In order to enable automatic replication to S3 storage, compile sqld with -F bottomless flag and run sqld with --enable-bottomless-replication parameter:

sqld --http-listen-addr=127.0.0.1:8000 --enable-bottomless-replication

Configuration

Replication needs to be able to access an S3-compatible bucket. The following environment variables can be used to configure the replication:

LIBSQL_BOTTOMLESS_BUCKET=my-bucket                 # Default bucket name: bottomless
LIBSQL_BOTTOMLESS_ENDPOINT='http://localhost:9000' # address can be overridden for local testing, e.g. with Minio
LIBSQL_BOTTOMLESS_AWS_SECRET_ACCESS_KEY=           # regular AWS variables are used
LIBSQL_BOTTOMLESS_AWS_ACCESS_KEY_ID=               # ... to set up auth, regions, etc.
LIBSQL_BOTTOMLESS_AWS_REGION=                      # .

bottomless-cli

Replicated snapshots can be inspected and managed with the official command-line interface.

The tool can be installed via cargo:

RUSTFLAGS='--cfg uuid_unstable' cargo install bottomless-cli

For usage examples and description, refer to the bottomless-cli documentation.

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in sqld by you, shall be licensed as MIT, without any additional terms or conditions.