To implement MCP functionality and chat functionality, libvault is used.

[wujian0327]

Start mcp server

To start a MegaEngine node with MCP enabled, launch the node as usual and add the --mcp flag, for example:

cargo run -- node start --alias node1 --addr 127.0.0.1:9000 --cert-path cert --mcp

if you also want an MCP SSE endpoint, add --mcp-sse-port 3001 (or another port), such as:

cargo run -- node start --alias node1 --addr 127.0.0.1:9000 --cert-path cert --mcp --mcp-sse-port 3001

Send a message to node1:

cargo run -- chat send --to <node1_did> --msg "hello from node2"

Use libvault

Generate certificates using libvault

[Copilot]

Pull request overview

This PR adds MCP server support (stdio + SSE), introduces an encrypted peer-to-peer chat feature backed by SQLite storage, and replaces rcgen-based certificate generation with libvault/openssl while evolving DB schema and repo metadata.

Changes:

• Add MCP servers: stdio JSON-RPC handler and an Axum-based SSE endpoint.
• Add encrypted P2P chat messages (gossip message types, sender task, DB persistence, CLI commands).
• Update storage schema/ORM models (repos/refs/chat_messages) and enhance repo metadata (language/size/latest_commit_at); migrate cert generation to libvault.

Reviewed changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/gossip_three_nodes.rs	Use per-node cert files; add cleanup of generated certs.
tests/git_pack.rs	Minor modern Rust array arg usage for Command::args.
tests/bundle_two_nodes.rs	Minor string handling cleanup; add cert file cleanup.
src/transport/quic.rs	Improve connection close logging; serialize tests + add cert cleanup; add “no shared CA” test configs.
src/transport/config.rs	Use rustls provider-supported signature schemes; add QUIC client transport keepalive/idle timeout.
src/transport/cert.rs	Switch certificate generation to libvault + openssl and add tests for idempotency/recovery.
src/storage/repo_model.rs	Update repo DB model fields (language/size/latest_commit_at) and switch to pooled get_db_conn().
src/storage/ref_model.rs	Move refs to composite primary key and add created_at; update CRUD to use (repo_id, ref_name) lookup.
src/storage/node_model.rs	Switch DB access from init_db() to get_db_conn().
src/storage/mod.rs	Add schema management/migrations, introduce chat_messages table, replace init_db() with get_db_conn() pool-by-path.
src/storage/chat_message.rs	New SeaORM entity + helpers for chat message persistence and status updates.
src/repo/repo_manager.rs	Update tests/fixtures to new P2PDescription fields.
src/repo/repo.rs	Replace timestamp with language/latest_commit_at/size in P2PDescription.
src/node/node_manager.rs	Remove NodeManager implementation and tests.
src/node/node_id.rs	Small test cleanup (avoid redundant borrow).
src/node/node.rs	Minor test assertion cleanup.
src/node/mod.rs	Stop exporting removed node_manager module.
src/mcp/sse_server.rs	New Axum SSE-based MCP endpoint with session handling and JSON-RPC routing.
src/mcp/mod.rs	New MCP module exports.
src/mcp/mcp_server.rs	New stdio JSON-RPC MCP server with repo tools (list/details/clone).
src/main.rs	Add chat and mcp CLI commands; add node flags for MCP; route logs to stderr.
src/lib.rs	Export new chat and mcp modules.
src/identity/keypair.rs	Add message encryption/decryption helpers (ChaCha20Poly1305 + curve25519-dalek).
src/gossip/service.rs	Add sender mismatch check; add chat/chat-ack handling; reuse shared Envelope.
src/gossip/message.rs	Add chat message types and shared Envelope; adjust message hashing canonicalization.
src/git/pack.rs	Add post-clone checkout/reset steps when restoring from bundle.
src/git/git_repo.rs	Include remote branch refs; add get_latest_commit_time().
src/cli/repo.rs	Add language detection, repo size computation, improved output; store new metadata fields.
src/cli/node.rs	Start chat sender background task; add MCP SSE server spawning; warn about stdio MCP during node start.
src/cli/mod.rs	Wire in new chat CLI module.
src/cli/chat.rs	New chat CLI for send/list using DB queue + history display.
src/chat/service.rs	New chat sender loop, encryption, inbound processing, and ACK handling via gossip.
src/chat/mod.rs	New chat module export.
src/bundle/transfer.rs	Chunked transfer: consolidate chunk size const; write chunks by seek offset + ensure truncation at start.
README.md	Document chat usage.
Cargo.toml	Add dependencies: libvault/openssl, axum/tower-http, uuid/futures, chacha20poly1305/curve25519-dalek, etc.
Cargo.lock	Lockfile updates for new dependencies.
.gitignore	Ensure tmp/* is ignored and add dist/.

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[Copilot]

Pull request overview

This PR adds MCP (stdio + optional SSE) and encrypted peer-to-peer chat capabilities, while updating certificate generation to use libvault and expanding the SQLite schema to support new repo metadata and chat message persistence.

Changes:

• Add MCP server (stdio JSON-RPC) and an Axum-based SSE gateway for MCP requests.
• Introduce encrypted P2P chat over gossip, plus CLI commands and DB persistence for chat messages.
• Replace certificate generation with libvault/OpenSSL and evolve the SQLite schema (repos/refs/chat_messages), including migration logic.

Reviewed changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/gossip_three_nodes.rs	Uses unique cert filenames and cleans up generated certs.
tests/git_pack.rs	Minor args API modernization for Command.
tests/bundle_two_nodes.rs	Uses an isolated temp cert directory and improves cleanup.
src/transport/quic.rs	Improves connection cleanup logging; serializes transport tests + cert cleanup; adds “no shared CA” test.
src/transport/config.rs	Uses rustls crypto provider schemes; adds client transport keepalive/idle timeout.
src/transport/cert.rs	Switches cert generation to libvault/OpenSSL; adds unit tests.
src/storage/repo_model.rs	Updates repo schema fields and switches to get_db_conn.
src/storage/ref_model.rs	Moves refs to composite primary key and adds created_at; switches to get_db_conn.
src/storage/node_model.rs	Switches DB access to get_db_conn.
src/storage/mod.rs	Adds schema creation + migration logic and new pooled get_db_conn.
src/storage/chat_message.rs	Adds SeaORM entity + helpers for chat message persistence.
src/repo/repo_manager.rs	Updates repo test descriptions to new metadata fields.
src/repo/repo.rs	Updates P2PDescription to language/size/latest_commit_at.
src/node/node_manager.rs	Removes NodeManager module (deleted).
src/node/node_id.rs	Minor test cleanup.
src/node/node.rs	Minor assertion style cleanup in tests.
src/node/mod.rs	Removes node_manager export.
src/mcp/sse_server.rs	Adds Axum SSE MCP gateway with session management.
src/mcp/mod.rs	Exposes MCP entrypoints.
src/mcp/mcp_server.rs	Adds stdio JSON-RPC MCP server and repo tools implementation.
src/main.rs	Adds chat and mcp CLI commands; adds node flags for MCP SSE; routes logging to stderr.
src/lib.rs	Exports new chat and mcp modules.
src/identity/keypair.rs	Adds ECDH+ChaCha20Poly1305 message encryption/decryption helpers.
src/gossip/service.rs	Adds sender-id consistency check; integrates chat/chat-ack handling; uses shared Envelope type.
src/gossip/message.rs	Adds chat message/ack types and shared Envelope; tweaks SignedMessage hashing.
src/git/pack.rs	Ensures bundle clone checks out a branch/reset to populate working tree.
src/git/git_repo.rs	Reads remote refs too; adds latest commit time helper.
src/cli/repo.rs	Adds language detection, repo size, and latest commit time; improves CLI output formatting.
src/cli/node.rs	Starts chat sender task; optionally starts MCP SSE server; warns about stdio MCP on node start.
src/cli/mod.rs	Exposes chat command handler.
src/cli/chat.rs	Adds chat send and chat list CLI commands.
src/chat/service.rs	Implements chat sending (DB queue + background), receiving, and ack processing.
src/chat/mod.rs	Adds chat module export.
src/bundle/transfer.rs	Writes chunks by offset (seek) and pre-truncates file on START.
README.md	Documents chat usage.
Cargo.toml	Adds libvault/openssl/axum/chat crypto deps.
Cargo.lock	Dependency lock updates for new crates.
.gitignore	Ignores tmp/ and dist/.

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[Copilot]

Pull request overview

This PR adds MCP (stdio + optional SSE) and encrypted P2P chat capabilities to MegaEngine, while also switching certificate generation to libvault/openssl and extending the local SQLite schema to persist additional repo/ref/chat metadata.

Changes:

• Add MCP server (stdio) plus an Axum-based SSE endpoint for MCP tool calls.
• Add encrypted node-to-node chat with DB-backed message queueing and delivery ACKs.
• Replace rcgen certificate generation with libvault/OpenSSL and migrate storage schema (repos/refs/chat tables + new DB connection helper).

Reviewed changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/gossip_three_nodes.rs	Updates test cert filenames and adds cleanup of generated cert files.
tests/git_pack.rs	Minor command args ergonomics updates.
tests/bundle_two_nodes.rs	Uses per-test temp cert directory and improves cleanup; minor iterator/string handling tweaks.
src/transport/quic.rs	Improves connection close logging; adds test serialization lock + cert cleanup; adds “no shared CA” test configs.
src/transport/config.rs	Uses rustls provider-supported schemes; sets Quinn transport idle timeout + keepalive.
src/transport/cert.rs	Replaces rcgen with libvault/OpenSSL-based CA/server cert generation; adds unit tests.
src/storage/repo_model.rs	Updates repo schema mapping (language/size/latest_commit_at) and switches to get_db_conn().
src/storage/ref_model.rs	Switches refs to composite primary key and adds created_at; switches to get_db_conn().
src/storage/node_model.rs	Switches node DB access to get_db_conn().
src/storage/mod.rs	Introduces schema migration/rebuild helpers and path-scoped DB connection caching via get_db_conn().
src/storage/chat_message.rs	Adds SeaORM entity + helpers for persisting chat messages and statuses.
src/repo/repo_manager.rs	Updates tests to new repo description fields.
src/repo/repo.rs	Extends P2PDescription with language/latest_commit_at/size.
src/node/node_manager.rs	Removes NodeManager implementation and its tests.
src/node/node_id.rs	Minor string usage cleanup in test.
src/node/node.rs	Test assertion style cleanup.
src/node/mod.rs	Removes node_manager module export.
src/mcp/sse_server.rs	Adds Axum SSE server for MCP JSON-RPC over HTTP + session management.
src/mcp/mod.rs	Exposes MCP modules and server starters.
src/mcp/mcp_server.rs	Adds MCP stdio JSON-RPC server and repo tools (list/details/clone).
src/main.rs	Adds chat and mcp CLI commands; adds node flags for MCP (deprecated stdio) + SSE port.
src/lib.rs	Exposes new chat and mcp modules.
src/identity/keypair.rs	Adds custom ECDH+ChaCha20Poly1305 encryption/decryption for chat payloads.
src/gossip/service.rs	Adds sender-id consistency check; logs ref diffs; handles chat + ack messages.
src/gossip/message.rs	Adds chat/ack message types and shared Envelope; adjusts hashing approach.
src/git/pack.rs	Adds post-clone checkout/reset steps when restoring from bundle.
src/git/git_repo.rs	Enhances ref reading to distinguish local vs remote branches; adds latest commit timestamp helper.
src/cli/repo.rs	Adds language detection, size calculation, latest commit time; improves output formatting.
src/cli/node.rs	Starts background chat sender task; warns that --mcp stdio is ignored; optionally starts MCP SSE server.
src/cli/mod.rs	Wires in chat CLI.
src/cli/chat.rs	Adds chat send (queue to DB) and chat list commands.
src/chat/service.rs	Adds background sender, message encryption, inbound decrypt + persistence, and ACK handling.
src/chat/mod.rs	Exposes chat service module.
src/bundle/transfer.rs	Refactors chunking constant; writes bundle chunks at offsets (seek/write) and truncates on start.
README.md	Documents chat feature usage.
Cargo.toml	Adds deps for libvault/openssl, axum SSE stack, uuid/futures, and chat crypto deps.
Cargo.lock	Dependency graph updates for new crates.
.gitignore	Adjusts tmp ignore and adds dist/.

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