feat(mpc-system): implement delegate party for hybrid custody
- Add ShareForUser field to ParticipateKeygenOutput
- Implement role-based share handling (persistent/delegate/temporary)
- Add in-memory share cache with 15-minute TTL for delegate parties
- Add GET /api/v1/sessions/:session_id/user-share endpoint for one-time share retrieval
- Shares from delegate parties are NOT saved to database
- Add comprehensive Delegate Party implementation guide
This implements hybrid custody model similar to Fireblocks and ZenGo:
- Persistent parties: shares stored in server database
- Delegate parties: shares returned to user, deleted from memory after retrieval
🤖 Generated with Claude Code
This commit is contained in:
parent
c976fd3eb1
commit
d7f181f2ec
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@ -1,44 +1,12 @@
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{
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||||
"permissions": {
|
||||
"allow": [
|
||||
"Bash(git add:*)",
|
||||
"Bash(git commit:*)",
|
||||
"Bash(git push:*)",
|
||||
"Bash(wsl.exe -e bash -c \"ls -la ~/ | head -20\")",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian && git pull\")",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian/backend/mpc-system && make proto\":*)",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian/backend/mpc-system && export PATH=$PATH:~/go/bin && go version\")",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian/backend/mpc-system && ./deploy.sh build\")",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian/backend/mpc-system && chmod +x deploy.sh && ./deploy.sh build\")",
|
||||
"Bash(wsl.exe -e bash -c \"cd ~/rwadurian/backend/mpc-system && cp .env.example .env && ./deploy.sh build\")",
|
||||
"Bash(wsl.exe -e bash -c:*)",
|
||||
"Bash(wsl.exe -e bash -l -c \"go version\")",
|
||||
"Bash(wsl.exe -e bash:*)",
|
||||
"Bash(wsl.exe -- bash -l -c 'go version && protoc --version')",
|
||||
"Bash(wsl.exe -- bash --login -c 'echo \\$PATH | grep -o \"\"/usr/local/go/bin\"\"')",
|
||||
"Bash(wsl.exe -- bash --login -c:*)",
|
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"Bash(done)",
|
||||
"Bash(wsl.exe -- bash -c 'env PATH=/usr/local/go/bin:/home/dong/go/bin:/usr/bin:/bin go install github.com/fullstorydev/grpcurl/cmd/grpcurl@latest && /home/dong/go/bin/grpcurl -version')",
|
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"Bash(wsl.exe -- bash -c 'env PATH=/home/dong/go/bin:/usr/bin:/bin grpcurl -plaintext localhost:50051 list')",
|
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|
||||
"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && docker compose exec session-coordinator netstat -tlnp 2>/dev/null || docker compose exec session-coordinator ss -tlnp')",
|
||||
"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && echo \"\"=== Session Coordinator ===\"\" && docker compose exec session-coordinator ss -tlnp | grep -E \"\"8080|50051\"\" && echo \"\"\"\" && echo \"\"=== Message Router ===\"\" && docker compose exec message-router ss -tlnp | grep -E \"\"8080|50051\"\" && echo \"\"\"\" && echo \"\"=== Account Service ===\"\" && docker compose exec account-service ss -tlnp | grep -E \"\"8080|50051\"\"')",
|
||||
"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && docker compose exec session-coordinator ss -tlnp')",
|
||||
"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && docker compose ps --format \"\"table {{.Name}}\\t{{.Ports}}\"\" | head -20')",
|
||||
"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && docker compose exec account-service /bin/sh -c \"\"echo \\\"\"Testing internal gRPC connectivity...\\\"\" && nc -zv mpc-session-coordinator 50051 2>&1 || echo \\\"\"nc not available\\\"\"\"\"')",
|
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"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && cat << \"\"EOF\"\" > /tmp/test_grpc_connectivity.sh\n#!/bin/sh\n\necho \"\"================================================\"\"\necho \"\" gRPC Internal Connectivity Test\"\"\necho \"\"================================================\"\"\necho \"\"\"\"\n\n# Test from account-service to other services\necho \"\"Testing from account-service:\"\"\necho \"\" → session-coordinator:50051\"\"\ndocker compose exec -T account-service /bin/sh -c \"\"nc -zv mpc-session-coordinator 50051 2>&1 | head -1\"\"\n\necho \"\" → message-router:50051\"\"\ndocker compose exec -T account-service /bin/sh -c \"\"nc -zv mpc-message-router 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-1:50051\"\"\ndocker compose exec -T account-service /bin/sh -c \"\"nc -zv mpc-server-party-1 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-2:50051\"\"\ndocker compose exec -T account-service /bin/sh -c \"\"nc -zv mpc-server-party-2 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-3:50051\"\"\ndocker compose exec -T account-service /bin/sh -c \"\"nc -zv mpc-server-party-3 50051 2>&1 | head -1\"\"\n\necho \"\"\"\"\necho \"\"Testing from session-coordinator:\"\"\necho \"\" → message-router:50051\"\"\ndocker compose exec -T session-coordinator /bin/sh -c \"\"nc -zv mpc-message-router 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-1:50051\"\" \ndocker compose exec -T session-coordinator /bin/sh -c \"\"nc -zv mpc-server-party-1 50051 2>&1 | head -1\"\"\n\necho \"\"\"\"\necho \"\"Testing from message-router:\"\"\necho \"\" → server-party-1:50051\"\"\ndocker compose exec -T message-router /bin/sh -c \"\"nc -zv mpc-server-party-1 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-2:50051\"\"\ndocker compose exec -T message-router /bin/sh -c \"\"nc -zv mpc-server-party-2 50051 2>&1 | head -1\"\"\n\necho \"\" → server-party-3:50051\"\"\ndocker compose exec -T message-router /bin/sh -c \"\"nc -zv mpc-server-party-3 50051 2>&1 | head -1\"\"\n\necho \"\"\"\"\necho \"\"================================================\"\"\necho \"\"✅ All gRPC ports accessible within Docker network\"\"\necho \"\"================================================\"\"\nEOF\n\nchmod +x /tmp/test_grpc_connectivity.sh\nbash /tmp/test_grpc_connectivity.sh\n')",
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"Bash(wsl.exe -- bash -c 'cd ~/rwadurian/backend/mpc-system && docker compose logs server-party-1 | grep -E \"\"Starting|gRPC|port\"\" | tail -10')",
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"Bash(wsl.exe -- bash -c 'cat ~/rwadurian/backend/mpc-system/services/server-party/cmd/server/main.go | grep -E \"\"grpc|GRPC|gRPC|50051\"\" | head -20')",
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"Bash(wsl.exe -- bash:*)",
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"Bash(dir:*)",
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"Bash(go version:*)",
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"Bash(go build:*)",
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"Bash(go mod tidy:*)",
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"Bash(findstr:*)",
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"Bash(protoc:*)"
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"Bash(powershell -Command \"(Get-Content ''api\\grpc\\router\\v1\\message_router.pb.go'' | Measure-Object -Line).Lines\")",
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"Bash(powershell -Command \"Select-String -Path ''api\\grpc\\router\\v1\\message_router.pb.go'' -Pattern ''type SessionEvent'' | Select-Object -First 3\")",
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"Bash(go list:*)",
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"Bash(find:*)"
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],
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"deny": [],
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"ask": []
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@ -0,0 +1,522 @@
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# Delegate Party Implementation Guide
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## 概述
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Delegate Party 是一种特殊类型的 Server-Party，用于生成用户端 key shares 并返回给用户，而不保存到服务器数据库中。
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这是 **混合托管（Hybrid Custody）** 模式的核心实现，类似于 Fireblocks 和 ZenGo 的架构。
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---
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## 架构设计
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### 三种 Party Role
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| Role | 存储位置 | 用途 | 示例 |
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|------|---------|------|------|
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| **persistent** | 服务器数据库 | 永久存储 share | 托管钱包、企业密钥 |
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| **delegate** | **不保存**，返回给用户 | 用户自己持有 share | 移动钱包、个人密钥 |
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| **temporary** | 临时（不实现） | 一次性操作 | 临时签名 |
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### MPC Session 组合示例
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```
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Keygen Session (3-of-5)
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├── Persistent Party 1 → Database (share_1) ✅ 服务器托管
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├── Persistent Party 2 → Database (share_2) ✅ 服务器托管
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├── Persistent Party 3 → Database (share_3) ✅ 服务器托管
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├── Delegate Party 1 → User Device (share_4) 📱 用户自持
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└── Delegate Party 2 → User Device (share_5) 📱 用户自持
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签名时需要任意 3 个 shares：
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- 方案 A: 3 个服务器 shares（完全托管）
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- 方案 B: 2 个服务器 + 1 个用户（用户参与）
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- 方案 C: 1 个服务器 + 2 个用户（用户主导）
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```
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---
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## 完整工作流程
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### 1. 部署 Delegate Parties
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**Kubernetes Deployment**:
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: mpc-delegate-party
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namespace: mpc-system
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: mpc-server-party
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party-role: delegate
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template:
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metadata:
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labels:
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app: mpc-server-party
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party-role: delegate # ← Party Discovery 使用
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spec:
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containers:
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- name: delegate-party
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image: rwadurian/mpc-server-party:latest
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env:
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- name: PARTY_ROLE
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value: "delegate" # ← 关键环境变量
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- name: MESSAGE_ROUTER_ADDR
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value: "mpc-message-router:9092"
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- name: SESSION_COORDINATOR_ADDR
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value: "mpc-session-coordinator:9091"
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ports:
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- containerPort: 8080
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name: http
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```
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**Docker Compose** (Development):
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```yaml
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services:
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delegate-party-1:
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image: rwadurian/mpc-server-party:latest
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container_name: delegate-party-1
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environment:
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PARTY_ROLE: "delegate"
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MESSAGE_ROUTER_ADDR: "mpc-message-router:9092"
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SESSION_COORDINATOR_ADDR: "mpc-session-coordinator:9091"
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ports:
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- "8081:8080"
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```
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---
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### 2. 创建 Session（指定 Party Composition）
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**API Request** (POST `/api/v1/sessions/create`):
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```json
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{
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"session_type": "keygen",
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"threshold_n": 5,
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"threshold_t": 3,
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"expires_in": 600,
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"party_composition": {
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"persistent_count": 3,
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"delegate_count": 2
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}
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}
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```
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**Response**:
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```json
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{
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"session_id": "550e8400-e29b-41d4-a716-446655440000",
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"join_tokens": {
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"mpc-server-party-1": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
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"mpc-server-party-2": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
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"mpc-server-party-3": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
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"mpc-delegate-party-0": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
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"mpc-delegate-party-1": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
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},
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"expires_at": "2024-01-01T12:10:00Z"
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}
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```
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---
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### 3. Keygen 协议执行
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**Session Coordinator** 发布 SessionEvent:
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```
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1. Session Coordinator
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└─ PublishSessionCreated() → Message Router
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2. Message Router 广播到所有 selected parties:
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├─ → mpc-server-party-1 (persistent)
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├─ → mpc-server-party-2 (persistent)
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├─ → mpc-server-party-3 (persistent)
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├─ → mpc-delegate-party-0 (delegate)
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└─ → mpc-delegate-party-1 (delegate)
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3. All Parties 收到 SessionEvent:
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├─ 提取自己的 JoinToken
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├─ 调用 JoinSession()
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└─ 执行 GG20 Keygen 协议
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```
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---
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### 4. Keygen 完成后的处理
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**Persistent Parties**:
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```go
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// participate_keygen.go:165-173
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case "persistent":
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// 保存 share 到数据库
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if err := uc.keyShareRepo.Save(ctx, keyShare); err != nil {
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return nil, ErrShareSaveFailed
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}
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logger.Info("Share saved to database (persistent party)",
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zap.String("party_id", input.PartyID),
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zap.String("session_id", input.SessionID.String()))
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```
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**Delegate Parties**:
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```go
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// participate_keygen.go:175-181
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case "delegate":
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// 不保存到数据库，返回给用户
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shareForUser = encryptedShare
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logger.Info("Share NOT saved, will be returned to user (delegate party)",
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zap.String("party_id", input.PartyID),
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zap.String("session_id", input.SessionID.String()),
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zap.Int("share_size", len(shareForUser)))
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```
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**存入内存缓存** (main.go:328-340):
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```go
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// 如果是 delegate party，将 share 存入缓存
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if output.ShareForUser != nil && len(output.ShareForUser) > 0 {
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globalShareCache.Store(
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sessionID,
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req.PartyID,
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output.ShareForUser,
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output.PublicKey,
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)
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logger.Info("Share stored in cache for user retrieval (delegate party)")
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}
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```
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---
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### 5. 用户获取 Share
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**API Request** (GET `/api/v1/sessions/{session_id}/user-share`):
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```bash
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curl -X GET \
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https://delegate-party-1.example.com/api/v1/sessions/550e8400-e29b-41d4-a716-446655440000/user-share \
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-H "Authorization: Bearer <optional_jwt_token>"
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```
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**成功响应**:
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```json
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{
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"session_id": "550e8400-e29b-41d4-a716-446655440000",
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"party_id": "mpc-delegate-party-0",
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"share": "0123456789abcdef...", // hex-encoded encrypted share
|
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"public_key": "04a1b2c3d4e5f6...", // hex-encoded public key
|
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"note": "This share has been deleted from memory and cannot be retrieved again"
|
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}
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```
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|
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**错误响应** (已被获取或过期):
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|
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```json
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{
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"error": "Share not found or already retrieved",
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"note": "Shares can only be retrieved once and expire after 15 minutes"
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}
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```
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|
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**Forbidden** (非 delegate party):
|
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|
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```json
|
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{
|
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"error": "This endpoint is only available for delegate parties",
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"role": "persistent"
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}
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```
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---
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## 安全特性
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### 1. 内存缓存（非持久化）
|
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|
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```go
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// share_cache.go
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type ShareCache struct {
|
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entries map[string]*ShareCacheEntry // session_id -> entry
|
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mu sync.RWMutex
|
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ttl time.Duration // 15 分钟
|
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}
|
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```
|
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|
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**特点**：
|
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- ✅ 只存在内存中（不写入磁盘）
|
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- ✅ 服务重启自动清空
|
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- ✅ 15 分钟 TTL 自动过期
|
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- ✅ 后台定时清理过期数据
|
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|
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### 2. 一次性获取
|
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|
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```go
|
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// GetAndDelete - 获取后立即删除
|
||||
func (c *ShareCache) GetAndDelete(sessionID uuid.UUID) (*ShareCacheEntry, bool) {
|
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c.mu.Lock()
|
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defer c.mu.Unlock()
|
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|
||||
entry, exists := c.entries[sessionID.String()]
|
||||
if !exists {
|
||||
return nil, false
|
||||
}
|
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|
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// 立即删除（原子操作）
|
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delete(c.entries, sessionID.String())
|
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|
||||
return entry, true
|
||||
}
|
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```
|
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|
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**特点**：
|
||||
- ✅ **只能获取一次**
|
||||
- ✅ 获取后立即从内存删除
|
||||
- ✅ 原子操作（线程安全）
|
||||
|
||||
### 3. Role 检查
|
||||
|
||||
```go
|
||||
// main.go:454-461
|
||||
// 检查 PARTY_ROLE 环境变量
|
||||
partyRole := os.Getenv("PARTY_ROLE")
|
||||
if partyRole != "delegate" {
|
||||
c.JSON(http.StatusForbidden, gin.H{
|
||||
"error": "This endpoint is only available for delegate parties",
|
||||
})
|
||||
return
|
||||
}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 测试指南
|
||||
|
||||
### 端到端测试流程
|
||||
|
||||
```bash
|
||||
# 1. 创建 Session
|
||||
curl -X POST http://localhost:9091/api/v1/sessions/create \
|
||||
-H "Content-Type: application/json" \
|
||||
-d '{
|
||||
"session_type": "keygen",
|
||||
"threshold_n": 5,
|
||||
"threshold_t": 3,
|
||||
"party_composition": {
|
||||
"persistent_count": 3,
|
||||
"delegate_count": 2
|
||||
}
|
||||
}'
|
||||
|
||||
# Response:
|
||||
# {
|
||||
# "session_id": "550e8400-e29b-41d4-a716-446655440000",
|
||||
# "join_tokens": { ... }
|
||||
# }
|
||||
|
||||
# 2. 等待 Keygen 完成（约 30-60 秒）
|
||||
# Parties 会自动接收 SessionEvent 并执行 Keygen
|
||||
|
||||
# 3. 检查日志
|
||||
docker logs mpc-delegate-party-0 | grep "Share stored in cache"
|
||||
|
||||
# 输出:
|
||||
# INFO Share stored in cache for user retrieval (delegate party)
|
||||
# session_id=550e8400-e29b-41d4-a716-446655440000
|
||||
# party_id=mpc-delegate-party-0
|
||||
# share_size=256
|
||||
|
||||
# 4. 用户获取 Share（第一次）
|
||||
curl -X GET http://localhost:8081/api/v1/sessions/550e8400-e29b-41d4-a716-446655440000/user-share
|
||||
|
||||
# Response:
|
||||
# {
|
||||
# "session_id": "550e8400-e29b-41d4-a716-446655440000",
|
||||
# "party_id": "mpc-delegate-party-0",
|
||||
# "share": "0a1b2c3d...",
|
||||
# "public_key": "04a1b2c3...",
|
||||
# "note": "This share has been deleted from memory..."
|
||||
# }
|
||||
|
||||
# 5. 再次尝试获取（应该失败）
|
||||
curl -X GET http://localhost:8081/api/v1/sessions/550e8400-e29b-41d4-a716-446655440000/user-share
|
||||
|
||||
# Response:
|
||||
# {
|
||||
# "error": "Share not found or already retrieved",
|
||||
# "note": "Shares can only be retrieved once..."
|
||||
# }
|
||||
|
||||
# 6. 验证持久化 Party（对比）
|
||||
curl -X GET http://localhost:8080/api/v1/shares/mpc-server-party-1
|
||||
|
||||
# Response (Persistent Party 有数据库记录):
|
||||
# {
|
||||
# "party_id": "mpc-server-party-1",
|
||||
# "count": 1,
|
||||
# "shares": [...]
|
||||
# }
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 对比总结
|
||||
|
||||
### Persistent vs Delegate
|
||||
|
||||
| 特性 | Persistent Party | Delegate Party |
|
||||
|-----|-----------------|---------------|
|
||||
| **存储位置** | PostgreSQL 数据库 | 内存缓存（临时） |
|
||||
| **持久化** | ✅ 永久保存 | ❌ 不保存 |
|
||||
| **获取方式** | 数据库查询（多次） | HTTP API（一次） |
|
||||
| **安全性** | 服务器托管 | 用户自持 |
|
||||
| **TTL** | 无限期 | 15 分钟 |
|
||||
| **重启后** | 数据保留 | **数据丢失** ✅ |
|
||||
|
||||
---
|
||||
|
||||
## 国际标准对比
|
||||
|
||||
| 方案 | Persistent Count | Delegate Count | 模式 |
|
||||
|------|-----------------|---------------|------|
|
||||
| **Fireblocks** | 2 | 1 | 2-of-3（1 个用户） |
|
||||
| **ZenGo** | 1 | 1 | 2-of-2（1 个用户） |
|
||||
| **Coinbase** | 3 | 0 | 3-of-5（全托管） |
|
||||
| **我们的系统** | **灵活配置** | **灵活配置** | 任意组合 |
|
||||
|
||||
---
|
||||
|
||||
## Kubernetes 完整部署示例
|
||||
|
||||
```yaml
|
||||
# k8s/delegate-party-deployment.yaml
|
||||
apiVersion: v1
|
||||
kind: Service
|
||||
metadata:
|
||||
name: mpc-delegate-party
|
||||
namespace: mpc-system
|
||||
spec:
|
||||
type: LoadBalancer # 或 Ingress
|
||||
ports:
|
||||
- port: 443
|
||||
targetPort: 8080
|
||||
name: https
|
||||
selector:
|
||||
app: mpc-server-party
|
||||
party-role: delegate
|
||||
|
||||
---
|
||||
apiVersion: apps/v1
|
||||
kind: Deployment
|
||||
metadata:
|
||||
name: mpc-delegate-party
|
||||
namespace: mpc-system
|
||||
spec:
|
||||
replicas: 2
|
||||
selector:
|
||||
matchLabels:
|
||||
app: mpc-server-party
|
||||
party-role: delegate
|
||||
template:
|
||||
metadata:
|
||||
labels:
|
||||
app: mpc-server-party
|
||||
party-role: delegate
|
||||
spec:
|
||||
containers:
|
||||
- name: delegate-party
|
||||
image: rwadurian/mpc-server-party:latest
|
||||
env:
|
||||
- name: PARTY_ROLE
|
||||
value: "delegate"
|
||||
- name: MESSAGE_ROUTER_ADDR
|
||||
value: "mpc-message-router:9092"
|
||||
- name: SESSION_COORDINATOR_ADDR
|
||||
value: "mpc-session-coordinator:9091"
|
||||
- name: MPC_CRYPTO_MASTER_KEY
|
||||
valueFrom:
|
||||
secretKeyRef:
|
||||
name: mpc-secrets
|
||||
key: crypto-master-key
|
||||
ports:
|
||||
- containerPort: 8080
|
||||
name: http
|
||||
resources:
|
||||
requests:
|
||||
memory: "256Mi"
|
||||
cpu: "500m"
|
||||
limits:
|
||||
memory: "512Mi"
|
||||
cpu: "1000m"
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 故障排查
|
||||
|
||||
### 问题 1: Share 获取失败
|
||||
|
||||
```bash
|
||||
# 错误: Share not found or already retrieved
|
||||
|
||||
# 可能原因:
|
||||
1. Share 已经被获取过（一次性）
|
||||
2. Share 已过期（15 分钟）
|
||||
3. Keygen 还未完成
|
||||
4. PARTY_ROLE 不是 "delegate"
|
||||
|
||||
# 排查步骤:
|
||||
# 检查缓存大小
|
||||
curl http://localhost:8081/health
|
||||
# 查看日志
|
||||
docker logs mpc-delegate-party-0 --tail 100
|
||||
```
|
||||
|
||||
### 问题 2: Endpoint 返回 403 Forbidden
|
||||
|
||||
```bash
|
||||
# 错误: This endpoint is only available for delegate parties
|
||||
|
||||
# 原因: PARTY_ROLE 环境变量不是 "delegate"
|
||||
|
||||
# 解决:
|
||||
kubectl set env deployment/mpc-delegate-party PARTY_ROLE=delegate
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 总结
|
||||
|
||||
✅ **已实现功能**:
|
||||
1. ✅ Delegate Party Role 定义
|
||||
2. ✅ PartyComposition API 支持
|
||||
3. ✅ Share 不保存到数据库
|
||||
4. ✅ 内存缓存（15 分钟 TTL）
|
||||
5. ✅ HTTP API 一次性获取
|
||||
6. ✅ 自动清理机制
|
||||
|
||||
✅ **安全特性**:
|
||||
1. ✅ 一次性获取
|
||||
2. ✅ 自动过期
|
||||
3. ✅ 重启清空
|
||||
4. ✅ Role 权限检查
|
||||
|
||||
✅ **符合国际标准**:
|
||||
- Fireblocks: Party-Driven + Delegate Share
|
||||
- ZenGo: Hybrid Custody
|
||||
- ING Bank: Threshold Signature
|
||||
|
||||
---
|
||||
|
||||
**文档版本**: 1.0
|
||||
**最后更新**: 2024-01-01
|
||||
**作者**: Claude (Anthropic)
|
||||
|
|
@ -3,6 +3,7 @@ package use_cases
|
|||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"os"
|
||||
"time"
|
||||
|
||||
"github.com/google/uuid"
|
||||
|
|
@ -30,9 +31,10 @@ type ParticipateKeygenInput struct {
|
|||
|
||||
// ParticipateKeygenOutput contains output from keygen participation
|
||||
type ParticipateKeygenOutput struct {
|
||||
Success bool
|
||||
KeyShare *entities.PartyKeyShare
|
||||
PublicKey []byte
|
||||
Success bool
|
||||
KeyShare *entities.PartyKeyShare
|
||||
PublicKey []byte
|
||||
ShareForUser []byte // For delegate parties: encrypted share to return to user (not saved to DB)
|
||||
}
|
||||
|
||||
// SessionCoordinatorClient defines the interface for session coordinator communication
|
||||
|
|
@ -141,7 +143,7 @@ func (uc *ParticipateKeygenUseCase) Execute(
|
|||
return nil, err
|
||||
}
|
||||
|
||||
// 5. Encrypt and save the share
|
||||
// 5. Encrypt the share
|
||||
encryptedShare, err := uc.cryptoService.EncryptShare(saveData, input.PartyID)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
|
|
@ -157,20 +159,54 @@ func (uc *ParticipateKeygenUseCase) Execute(
|
|||
publicKey,
|
||||
)
|
||||
|
||||
if err := uc.keyShareRepo.Save(ctx, keyShare); err != nil {
|
||||
return nil, ErrShareSaveFailed
|
||||
// 6. Handle share based on party role
|
||||
partyRole := uc.getPartyRole()
|
||||
var shareForUser []byte
|
||||
|
||||
switch partyRole {
|
||||
case "persistent":
|
||||
// Persistent Party: save share to database
|
||||
if err := uc.keyShareRepo.Save(ctx, keyShare); err != nil {
|
||||
return nil, ErrShareSaveFailed
|
||||
}
|
||||
logger.Info("Share saved to database (persistent party)",
|
||||
zap.String("party_id", input.PartyID),
|
||||
zap.String("session_id", input.SessionID.String()))
|
||||
|
||||
case "delegate":
|
||||
// Delegate Party: do NOT save to database, return to user
|
||||
shareForUser = encryptedShare
|
||||
logger.Info("Share NOT saved, will be returned to user (delegate party)",
|
||||
zap.String("party_id", input.PartyID),
|
||||
zap.String("session_id", input.SessionID.String()),
|
||||
zap.Int("share_size", len(shareForUser)))
|
||||
|
||||
case "temporary":
|
||||
// Temporary Party: optionally save to temp storage (not implemented yet)
|
||||
logger.Info("Temporary party - share not saved",
|
||||
zap.String("party_id", input.PartyID))
|
||||
|
||||
default:
|
||||
// Default to persistent for safety
|
||||
if err := uc.keyShareRepo.Save(ctx, keyShare); err != nil {
|
||||
return nil, ErrShareSaveFailed
|
||||
}
|
||||
logger.Warn("Unknown party role, defaulting to persistent",
|
||||
zap.String("party_id", input.PartyID),
|
||||
zap.String("role", partyRole))
|
||||
}
|
||||
|
||||
// 6. Report completion to coordinator
|
||||
// 7. Report completion to coordinator
|
||||
if err := uc.sessionClient.ReportCompletion(ctx, input.SessionID, input.PartyID, publicKey); err != nil {
|
||||
logger.Error("failed to report completion", zap.Error(err))
|
||||
// Don't fail - share is saved
|
||||
// Don't fail - share is handled
|
||||
}
|
||||
|
||||
return &ParticipateKeygenOutput{
|
||||
Success: true,
|
||||
KeyShare: keyShare,
|
||||
PublicKey: publicKey,
|
||||
Success: true,
|
||||
KeyShare: keyShare,
|
||||
PublicKey: publicKey,
|
||||
ShareForUser: shareForUser, // Only populated for delegate parties
|
||||
}, nil
|
||||
}
|
||||
|
||||
|
|
@ -292,3 +328,13 @@ func (h *keygenMessageHandler) convertMessages(ctx context.Context, inChan <-cha
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
// getPartyRole gets the party role from environment variable
|
||||
// Returns "persistent" (default), "delegate", or "temporary"
|
||||
func (uc *ParticipateKeygenUseCase) getPartyRole() string {
|
||||
role := os.Getenv("PARTY_ROLE")
|
||||
if role == "" {
|
||||
return "persistent" // Default to persistent for safety
|
||||
}
|
||||
return role
|
||||
}
|
||||
|
|
|
|||
|
|
@ -22,9 +22,13 @@ import (
|
|||
grpcclient "github.com/rwadurian/mpc-system/services/server-party/adapters/output/grpc"
|
||||
"github.com/rwadurian/mpc-system/services/server-party/adapters/output/postgres"
|
||||
"github.com/rwadurian/mpc-system/services/server-party/application/use_cases"
|
||||
"github.com/rwadurian/mpc-system/services/server-party/infrastructure/cache"
|
||||
"go.uber.org/zap"
|
||||
)
|
||||
|
||||
// Global share cache for delegate parties
|
||||
var globalShareCache *cache.ShareCache
|
||||
|
||||
func main() {
|
||||
// Parse flags
|
||||
configPath := flag.String("config", "", "Path to config file")
|
||||
|
|
@ -51,6 +55,10 @@ func main() {
|
|||
zap.String("environment", cfg.Server.Environment),
|
||||
zap.Int("http_port", cfg.Server.HTTPPort))
|
||||
|
||||
// Initialize share cache for delegate parties (15 minute TTL)
|
||||
globalShareCache = cache.NewShareCache(15 * time.Minute)
|
||||
logger.Info("Share cache initialized", zap.Duration("ttl", 15*time.Minute))
|
||||
|
||||
// Initialize database connection
|
||||
db, err := initDatabase(cfg.Database)
|
||||
if err != nil {
|
||||
|
|
@ -316,6 +324,20 @@ func startHTTPServer(
|
|||
zap.String("session_id", req.SessionID),
|
||||
zap.String("party_id", req.PartyID),
|
||||
zap.Bool("success", output.Success))
|
||||
|
||||
// If this is a delegate party and share is available, store in cache
|
||||
if output.ShareForUser != nil && len(output.ShareForUser) > 0 {
|
||||
globalShareCache.Store(
|
||||
sessionID,
|
||||
req.PartyID,
|
||||
output.ShareForUser,
|
||||
output.PublicKey,
|
||||
)
|
||||
logger.Info("Share stored in cache for user retrieval (delegate party)",
|
||||
zap.String("session_id", req.SessionID),
|
||||
zap.String("party_id", req.PartyID),
|
||||
zap.Int("share_size", len(output.ShareForUser)))
|
||||
}
|
||||
}()
|
||||
|
||||
c.JSON(http.StatusAccepted, gin.H{
|
||||
|
|
@ -422,6 +444,52 @@ func startHTTPServer(
|
|||
"shares": shareInfos,
|
||||
})
|
||||
})
|
||||
|
||||
// Get user share for delegate parties (one-time retrieval)
|
||||
// This endpoint is ONLY for delegate parties to return shares to users
|
||||
api.GET("/sessions/:session_id/user-share", func(c *gin.Context) {
|
||||
sessionIDStr := c.Param("session_id")
|
||||
|
||||
// Check if this is a delegate party
|
||||
partyRole := os.Getenv("PARTY_ROLE")
|
||||
if partyRole != "delegate" {
|
||||
c.JSON(http.StatusForbidden, gin.H{
|
||||
"error": "This endpoint is only available for delegate parties",
|
||||
"role": partyRole,
|
||||
})
|
||||
return
|
||||
}
|
||||
|
||||
sessionID, err := uuid.Parse(sessionIDStr)
|
||||
if err != nil {
|
||||
c.JSON(http.StatusBadRequest, gin.H{
|
||||
"error": "invalid session_id format",
|
||||
})
|
||||
return
|
||||
}
|
||||
|
||||
// Retrieve and delete share from cache (one-time retrieval)
|
||||
entry, exists := globalShareCache.GetAndDelete(sessionID)
|
||||
if !exists {
|
||||
c.JSON(http.StatusNotFound, gin.H{
|
||||
"error": "Share not found or already retrieved",
|
||||
"note": "Shares can only be retrieved once and expire after 15 minutes",
|
||||
})
|
||||
return
|
||||
}
|
||||
|
||||
logger.Info("User share retrieved successfully",
|
||||
zap.String("session_id", sessionIDStr),
|
||||
zap.String("party_id", entry.PartyID))
|
||||
|
||||
c.JSON(http.StatusOK, gin.H{
|
||||
"session_id": sessionIDStr,
|
||||
"party_id": entry.PartyID,
|
||||
"share": hex.EncodeToString(entry.Share),
|
||||
"public_key": hex.EncodeToString(entry.PublicKey),
|
||||
"note": "This share has been deleted from memory and cannot be retrieved again",
|
||||
})
|
||||
})
|
||||
}
|
||||
|
||||
logger.Info("Starting HTTP server", zap.Int("port", cfg.Server.HTTPPort))
|
||||
|
|
|
|||
170
backend/mpc-system/services/server-party/infrastructure/cache/share_cache.go
vendored
Normal file
170
backend/mpc-system/services/server-party/infrastructure/cache/share_cache.go
vendored
Normal file
|
|
@ -0,0 +1,170 @@
|
|||
package cache
|
||||
|
||||
import (
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/google/uuid"
|
||||
"github.com/rwadurian/mpc-system/pkg/logger"
|
||||
"go.uber.org/zap"
|
||||
)
|
||||
|
||||
// ShareCacheEntry represents a cached share entry
|
||||
type ShareCacheEntry struct {
|
||||
SessionID uuid.UUID
|
||||
PartyID string
|
||||
Share []byte
|
||||
PublicKey []byte
|
||||
ExpiresAt time.Time
|
||||
RetrievedOnce bool // Track if share has been retrieved
|
||||
}
|
||||
|
||||
// ShareCache provides in-memory caching for delegate party shares
|
||||
// Shares are stored temporarily and deleted after retrieval
|
||||
type ShareCache struct {
|
||||
entries map[string]*ShareCacheEntry // sessionID -> entry
|
||||
mu sync.RWMutex
|
||||
ttl time.Duration
|
||||
}
|
||||
|
||||
// NewShareCache creates a new share cache
|
||||
func NewShareCache(ttl time.Duration) *ShareCache {
|
||||
cache := &ShareCache{
|
||||
entries: make(map[string]*ShareCacheEntry),
|
||||
ttl: ttl,
|
||||
}
|
||||
|
||||
// Start background cleanup goroutine
|
||||
go cache.cleanupExpired()
|
||||
|
||||
return cache
|
||||
}
|
||||
|
||||
// Store stores a share in the cache
|
||||
func (c *ShareCache) Store(sessionID uuid.UUID, partyID string, share, publicKey []byte) {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
|
||||
entry := &ShareCacheEntry{
|
||||
SessionID: sessionID,
|
||||
PartyID: partyID,
|
||||
Share: share,
|
||||
PublicKey: publicKey,
|
||||
ExpiresAt: time.Now().Add(c.ttl),
|
||||
RetrievedOnce: false,
|
||||
}
|
||||
|
||||
c.entries[sessionID.String()] = entry
|
||||
|
||||
logger.Info("Share stored in cache",
|
||||
zap.String("session_id", sessionID.String()),
|
||||
zap.String("party_id", partyID),
|
||||
zap.Int("share_size", len(share)),
|
||||
zap.Time("expires_at", entry.ExpiresAt))
|
||||
}
|
||||
|
||||
// Get retrieves a share from the cache
|
||||
// The share is marked as retrieved but not deleted yet
|
||||
// Use Delete() to remove it after successful delivery to user
|
||||
func (c *ShareCache) Get(sessionID uuid.UUID) (*ShareCacheEntry, bool) {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
|
||||
entry, exists := c.entries[sessionID.String()]
|
||||
if !exists {
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// Check if expired
|
||||
if time.Now().After(entry.ExpiresAt) {
|
||||
delete(c.entries, sessionID.String())
|
||||
logger.Warn("Share expired",
|
||||
zap.String("session_id", sessionID.String()))
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// Mark as retrieved
|
||||
entry.RetrievedOnce = true
|
||||
|
||||
logger.Info("Share retrieved from cache",
|
||||
zap.String("session_id", sessionID.String()),
|
||||
zap.String("party_id", entry.PartyID))
|
||||
|
||||
return entry, true
|
||||
}
|
||||
|
||||
// Delete deletes a share from the cache
|
||||
func (c *ShareCache) Delete(sessionID uuid.UUID) {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
|
||||
delete(c.entries, sessionID.String())
|
||||
|
||||
logger.Info("Share deleted from cache",
|
||||
zap.String("session_id", sessionID.String()))
|
||||
}
|
||||
|
||||
// GetAndDelete retrieves and immediately deletes a share (atomic operation)
|
||||
// This ensures the share can only be retrieved once
|
||||
func (c *ShareCache) GetAndDelete(sessionID uuid.UUID) (*ShareCacheEntry, bool) {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
|
||||
entry, exists := c.entries[sessionID.String()]
|
||||
if !exists {
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// Check if expired
|
||||
if time.Now().After(entry.ExpiresAt) {
|
||||
delete(c.entries, sessionID.String())
|
||||
logger.Warn("Share expired",
|
||||
zap.String("session_id", sessionID.String()))
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// Delete immediately
|
||||
delete(c.entries, sessionID.String())
|
||||
|
||||
logger.Info("Share retrieved and deleted from cache (one-time retrieval)",
|
||||
zap.String("session_id", sessionID.String()),
|
||||
zap.String("party_id", entry.PartyID))
|
||||
|
||||
return entry, true
|
||||
}
|
||||
|
||||
// Size returns the number of entries in the cache
|
||||
func (c *ShareCache) Size() int {
|
||||
c.mu.RLock()
|
||||
defer c.mu.RUnlock()
|
||||
return len(c.entries)
|
||||
}
|
||||
|
||||
// cleanupExpired removes expired entries periodically
|
||||
func (c *ShareCache) cleanupExpired() {
|
||||
ticker := time.NewTicker(1 * time.Minute)
|
||||
defer ticker.Stop()
|
||||
|
||||
for range ticker.C {
|
||||
c.mu.Lock()
|
||||
now := time.Now()
|
||||
var expired []string
|
||||
|
||||
for sessionID, entry := range c.entries {
|
||||
if now.After(entry.ExpiresAt) {
|
||||
expired = append(expired, sessionID)
|
||||
}
|
||||
}
|
||||
|
||||
for _, sessionID := range expired {
|
||||
delete(c.entries, sessionID)
|
||||
}
|
||||
|
||||
if len(expired) > 0 {
|
||||
logger.Info("Cleaned up expired shares",
|
||||
zap.Int("count", len(expired)))
|
||||
}
|
||||
|
||||
c.mu.Unlock()
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue