flatbuffers (versatica#1064)

Flatbuffers

WIP to remove JSON in favour of flatbuffers for as the worker communication format.

- JSON parsing is CPU intensive.
- JSON is not type safe.
- flatbuffers does not parse the buffer. Reading the message takes 0ms.
- flatbuffers is type safe since code (C++, Typescript, Rust, etc) is autogenerated out of the schema definitions.

Extras that come along with this changes:
- There is now a single Channel for worker communication.
- Previously there were 2 (Channel and PayloadChannel)
- Each message sent Node->Worker requires a single write() call to Channel.
- Previously 2 calls per message were needed for Channel and 4 for PayloadChannel.
- Each message sent Worker->Node previously executed two extra calls to memcpy that are not executed now.

---------

Co-authored-by: Iñaki Baz Castillo <ibc@aliax.net>
Co-authored-by: Nazar Mokrynskyi <nazar@mokrynskyi.com>

.github/workflows/mediasoup-node.yaml

@@ -13,6 +13,8 @@ jobs:
     strategy:
       matrix:
         ci:
+          - os: ubuntu-20.04
+            node: 16
           - os: ubuntu-20.04
             node: 18
           - os: ubuntu-22.04
@@ -45,6 +47,8 @@ jobs:
           restore-keys: |
             ${{ matrix.ci.os }}-node-
 
-      - run: npm ci
+      # NOTE: Add --force since otherwise `npm ci` fails in Node 26 because
+      # @octokit/auth-token dev dependency requires Node >= 16.
+      - run: npm ci --force
       - run: npm run lint:node
       - run: npm run test:node

.gitignore

@@ -7,15 +7,18 @@
 ## Node.
 /node_modules
 /node/lib
+# flatc generated files.
+/node/src/fbs
 
 ## Rust.
-/Cargo.lock
 /rust/examples-frontend/*/node_modules
 /rust/examples-frontend/*/package-lock.json
 /target
 
 ## Worker.
 /worker/scripts/node_modules
+# Flatc generated files.
+/worker/include/FBS
 /worker/prebuild
 # Vistual Studio generated Stuff.
 /worker/**/Debug
@@ -30,14 +33,5 @@
 ## Others.
 /coverage
 /.cache
-/NO_GIT
-*.swp
-*.swo
-.DS_Store
-# Vistual Studio Code stuff.
-/.vscode
-# JetBrains IDE stuff.
-/.idea
-
 # Packaged module.
 *.tgz

CHANGELOG.md

@@ -1,6 +1,16 @@
 # Changelog
 
 
+### Next
+
+* Switch from JSON based messages to `flatbuffers` ([PR #1064](https://github.com/versatica/mediasoup/pull/1064)).
+* Add `ListenInfo` in all transports and send/recv buffer size options ([PR #1084](https://github.com/versatica/mediasoup/pull/1084)).
+* Add optional `rtcpListenInfo` in `PlainTransportOptions` ([PR #1099](https://github.com/versatica/mediasoup/pull/1099)).
+* Add pause/resume API in `DataProducer` and `DataConsumer` ([PR #1104](https://github.com/versatica/mediasoup/pull/1104)).
+* DataChannel subchannels feature ([PR #1152](https://github.com/versatica/mediasoup/pull/1152)).
+* `Worker`: Make DTLS fragment stay within MTU size range ([PR #1156](https://github.com/versatica/mediasoup/pull/1156), based on [PR #1143](https://github.com/versatica/mediasoup/pull/1143) by @vpnts-se).
+
+
 ### 3.12.16
 
 * Fix `IceServer` crash when client uses ICE renomination ([PR #1182](https://github.com/versatica/mediasoup/pull/1182)).