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https://github.com/logos-messaging/nim-sds.git
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f919957950
Per-entry removeIncomingRepair / removeOutgoingRepair calls are replaced by a single trySaveMeta per *dirty* channel at the end of that channel's sweep. Failure is logged but does NOT abort the sweep — in-memory state is the source of truth (PLAN_SNAPSHOT_PERSISTENCE.md §8). Helpers added in sds/sds_utils.nim: - snapshotMeta(channel) — capture current ChannelContext as ChannelMeta blob (flattens Table-keyed buffers to seqs for the wire shape). - trySaveMeta(rm, channelId, channel) — best-effort meta snapshot save; logs on failure, never propagates. - tryUpdateHistory(rm, channelId, append, evict) — best-effort history update; skips the call entirely when both lists are empty (HistoryUpdate contract). Call-rate impact for runRepairSweep: - Before: N persistence calls per expired entry per channel. - After: at most 1 saveChannelMeta per dirty channel; 0 on idle channels (matches the dirty-flag floor in ANALYSIS_SNAPSHOT_SAVE_POINTS). All existing tests pass — including the 3 SDS-R Repair Sweep tests that directly exercise this proc. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
nim-sds
Nim implementation of the e2e reliability protocol.
Prerequisites
- Nix package manager
Quick start
git clone https://github.com/logos-messaging/nim-sds.git
cd nim-sds
# Build the shared library
nix build '.#libsds'
# Run tests
nix develop --command nimble test
Building
Desktop
nix build --print-out-paths '.#libsds'
Android
nix build --print-out-paths '.#libsds-android-arm64'
nix build --print-out-paths '.#libsds-android-amd64'
nix build --print-out-paths '.#libsds-android-x86'
nix build --print-out-paths '.#libsds-android-arm'
iOS
nix build --print-out-paths '.#libsds-ios'
Development shell
Enter the dev shell:
nix develop
Build using nimble tasks:
# Dynamic library (auto-detects OS)
nimble libsdsDynamicMac # macOS
nimble libsdsDynamicLinux # Linux
nimble libsdsDynamicWindows # Windows
# Static library
nimble libsdsStaticMac # macOS
nimble libsdsStaticLinux # Linux
nimble libsdsStaticWindows # Windows
Run tests:
nimble test
The built library is output to build/.
Android (without Nix)
Download the latest Android NDK:
cd ~
wget https://dl.google.com/android/repository/android-ndk-r27c-linux.zip
unzip android-ndk-r27c-linux.zip
Add to ~/.bashrc:
export ANDROID_NDK_ROOT=$HOME/android-ndk-r27c
export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
Then build:
ARCH=arm64 nimble libsdsAndroid
| Architecture | Command |
|---|---|
| arm64 | ARCH=arm64 nimble libsdsAndroid |
| amd64 | ARCH=amd64 nimble libsdsAndroid |
| x86 | ARCH=x86 nimble libsdsAndroid |
The library is output to build/libsds.so.
Dependency management
Dependencies are managed by Nimble and pinned via nimble.lock.
To set up dependencies locally:
nimble setup -l
To update dependencies:
nimble lock
After updating nimble.lock, the Nix outputHash in nix/deps.nix must be recalculated
by running nix build and updating the hash from the error output.
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.