proxy-pool/docs/development/implementation-plan.md

Proxy Pool Implementation Plan

For agentic workers: REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development or superpowers:executing-plans. Every step is tracked with checkbox syntax and must preserve the requirement IDs in docs/requirements/traceability.md.

Goal: Build a production-oriented Go repository whose domain behavior, interfaces, configuration, contracts, documentation, and deployment layout implement the final semantics in 对话内容.md.

Architecture: Separate Gateway, Controller, Checker, and Loadgen commands. Domain packages remain transport-free. Gateway reads immutable local snapshots. Controller owns provider fetch, pool lifecycle, routing state, extraction, persistence, and worker distribution. PostgreSQL is authoritative; Redis stores rebuildable coordination state.

Tech Stack: Go 1.26, go.yaml.in/yaml/v4, pgx/v5, go-redis/v9, gRPC/Protobuf, Prometheus, PostgreSQL, Redis, Docker Compose, Kubernetes.

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File Structure

cmd/
  proxy-gateway/main.go
  proxy-controller/main.go
  proxy-checker/main.go
  proxy-loadgen/main.go
internal/
  config/{config.go,load.go,validate.go}
  domain/proxy/{proxy.go,state.go,capacity.go}
  domain/routing/{rule.go,strategy.go,sequential.go}
  domain/upstream/{upstream.go,fetch_result.go,pool.go}
  domain/extraction/{extraction.go,store.go}
  domain/client/client.go
  gateway/{server,dispatch,snapshot,transport}/
  controller/{provider,pool,routing,extraction,health,distribution}/
  adapters/{memory,postgres,redis,providerapi}/
  platform/{logging,metrics,shutdown}/
api/{openapi,proto}/
configs/
deploy/{compose,kubernetes,haproxy,prometheus,grafana}/
docs/{design,development,configuration,api,operations,testing,adr,requirements}/
diagrams/
examples/
test/{fixtures,integration,e2e,load}/

Task 1: Repository and Build Baseline

Files: go.mod, .golangci.yml, README.md, scripts/verify.ps1, .github/workflows/ci.yml

• Create module github.com/proxy-pool/proxy-pool with Go 1.26.
• Pin YAML v4, pgx/v5, go-redis/v9, gRPC, protobuf, Prometheus, and x/sync.
• Add scripts/verify.ps1 that runs format check, go vet, unit tests, race tests, and builds all commands, each test command bounded to 60 seconds.
• Add CI for Windows and Linux with unit/race/build jobs.
• Verify go mod tidy, go test ./..., and go build ./cmd/... succeed.

Task 2: Strict Configuration

Files: internal/config/config.go, load.go, validate.go, corresponding tests, configs/default.yaml, docs/configuration/reference.md

• Define versioned types for security, gateway, distribution, admin, metrics, storage, routing, upstream/provider/api/proxyAuth/pool/capacity/lifecycle/fetch/check.
• Decode one YAML document with known fields enabled and resolve ${ENV} plus secret file references without logging values.
• Validate listener protection, routing references/order, regexes, strategy fields, positive limits, TTL margins, pool/fetch limits, auth modes, and exposure modes.
• Add table tests for every invalid condition in CFG requirements.

Task 3: Proxy Domain and Capacity

Files: internal/domain/proxy/*.go, corresponding tests

• Implement Proxy fields, UTC TTL precedence, canonical host/port, and unique key.
• Implement state transitions and reject illegal transitions.
• Implement sharded runtime counters with CAS Reserve, Commit, Cancel, Release.
• Prove with 1,000 concurrent goroutines that effective capacity is never exceeded.
• Add race coverage and duplicate-release invariant metrics hook.

Task 4: Routing and Sequential Switching

Files: internal/domain/routing/*.go, corresponding tests

• Compile first-match host/method/path/header rules into an immutable RuleSet.
• Implement random, round-robin, weighted, least-connections, and sequential.
• Model upstream empty counters separately from per-routing current indexes.
• Implement versioned CAS switch so simultaneous threshold observers advance once.
• Cover four-empty-then-success, five-empty, A-to-B-only, disabled references, end behavior, and explicit onUnavailable.

Task 5: Provider Fetch Classification and Scheduling

Files: internal/controller/provider/*.go, internal/domain/upstream/*.go, tests

• Implement Valid, Empty, DuplicateOnly, and Error result classes exactly as the traceability matrix defines.
• Implement one coalesced reconcile signal per Upstream using singleflight.
• Enforce requestInterval, maxInFlight, maxSize, maxTotal, timeout, retry, exponential backoff, jitter, and Retry-After.
• Define ProviderAdapter and safe TemplateParser ports; add fixture adapters.
• Test that 100 concurrent capacity signals do not fan out 100 Provider calls.

Task 6: Pool Reconciliation and Ownership

Files: internal/controller/pool/*.go, internal/domain/upstream/pool.go, tests

• Compute Available Slots from eligible Proxy capacity, Active, Reserved, TTL, health, ownership, pending expected fetch, and gateway reserve.
• Implement pool.maxSize and fetch.maxTotal as distinct counters.
• Allocate each Proxy to one Worker with epoch/version/expiry ownership.
• Implement revoke -> drain -> ACK -> unowned transition.
• Test Worker crash expiry and prevent simultaneous dual ownership.

Task 7: Exclusive Extraction

Files: internal/domain/extraction/*.go, internal/controller/extraction/*.go, internal/adapters/memory/extraction.go, tests

• Implement POST extraction command with protocol/region/carrier/upstream filters.
• Enforce minRemainingTTL, maxHealthCheckAge, maxCount, client limits, and reserveForGateway.
• Atomically transition AVAILABLE to EXTRACTED and append audit records.
• Implement partial and allOrNothing without Lease, release, or renewal concepts.
• Run 1,000 concurrent claim attempts and prove every Proxy ID appears at most once.

Task 8: Immutable Snapshot and Dispatch

Files: internal/gateway/snapshot/*.go, internal/gateway/dispatch/*.go, tests

• Define cluster/worker/epoch/version/checksum snapshot envelopes.
• Build indexes before publication and atomically swap complete snapshots.
• Reject version gaps and wrong epochs; request full resync.
• Implement Dispatch Acquire/Commit/Release over local owned Proxy runtime.
• Benchmark 100k Proxy snapshots and record allocations and latency.

Task 9: Gateway Transport

Files: internal/gateway/server/*.go, internal/gateway/transport/*.go, tests

• Implement HTTP forward proxy and HTTPS CONNECT through an upstream proxy.
• Add Client auth/access/admission and destination policy checks before routing.
• Implement safe retry commit points and prevent non-idempotent/established tunnel replay.
• Use bounded buffers, deadlines, connection pools, and graceful shutdown.
• Add local fake upstream end-to-end tests for success, 407, timeout, cancel, half close, retry, and blocked private destinations.

Task 10: Controller APIs and Persistence Ports

Files: internal/controller/distribution/*.go, admin/*.go, internal/adapters/postgres/*.go, internal/adapters/redis/*.go, migrations, tests

• Define repository ports for Proxy, RoutingRuntime, Ownership, ExtractionRecord, Client, ConfigVersion, and Outbox.
• Implement PostgreSQL extraction with one transaction and FOR UPDATE SKIP LOCKED.
• Implement Redis coordination for Provider leader, distributed rate, Client limit, and Worker heartbeat; keep all state rebuildable.
• Expose Distribution extraction/status and Admin status/enable/disable/switch/reload.
• Add integration tests using Compose-backed PostgreSQL/Redis.

当前进度（2026-07-29）：已实现共享 platform/httpapi、Distribution extract/live/ready Handler 与 Admin status/enable/disable/switch/reload Handler； 定向契约测试已覆盖严格 JSON、Body 上限、Request ID、幂等 Header、DTO 映射、 404/405 及业务错误映射。共享 platform/httpsecurity 已补齐 Basic/API Key/ Bearer/CIDR、可信代理、Client ID、本地准入和 API 401/Gateway 407 差异，并作为 Admin/Distribution 必需依赖。共享 platform/httpserver 与 controller/runtime 已完成 Distribution/Admin 独立监听器、首错联动关闭和 有界优雅停机；端点正式勾选仍等待 PostgreSQL/Redis Adapter、命令入口与 Compose 集成测试。

Task 11: Checker and Health Reducer

Files: internal/controller/health/*.go, cmd/proxy-checker/main.go, tests

• Schedule global and route health with jitter and bounded maxInFlight.
• Implement FETCHED -> CHECKING -> AVAILABLE and SUSPECT/UNHEALTHY transitions.
• Ensure target failures affect only the target profile.
• Add fixture target server and deterministic clock/scheduler tests.

Task 12: Machine-readable Contracts

Files: api/openapi/proxy-pool.yaml, api/proto/controlplane/v1/controlplane.proto, docs/api/*.md

• Specify Distribution/Admin REST schemas, status codes, authentication, examples, and idempotency behavior.
• Specify Worker register, snapshot, delta, ACK, report, heartbeat, ownership drain, and resync messages.
• Validate OpenAPI and compile protobuf descriptors in CI.

Task 13: Deployment and Observability

Files: deploy/**, internal/platform/**, docs/operations/**

• Add Compose for local Controller/Gateway/Checker/PostgreSQL/Redis/Prometheus/ Grafana/HAProxy.
• Add Kubernetes Deployments, Services, PDBs, HPA, NetworkPolicy, Secrets examples, probes, resource limits, topology spread, and graceful termination.
• Add low-cardinality Prometheus metrics and structured secret-safe logs.
• Document backup, recovery, rollout, rollback, capacity, kernel, file descriptor, NAT/conntrack, and incident runbooks.

Task 14: Documentation, Examples, and Diagrams

Files: docs/**, examples/**, diagrams/**

• Complete README navigation, design document, developer guide, configuration reference, API guide, deployment guide, security model, testing guide, and roadmap.
• Provide at least 20 validated configuration examples.
• Provide at least 30 Mermaid architecture, flow, sequence, state, and failure diagrams.
• Generate proxy-pool-docs-v1.0.zip from versioned documentation assets.

Task 15: Completion Audit

• Map every requirement ID to code, test, contract, document, or verified runtime evidence.
• Run gofmt, go vet, unit tests, race tests, builds, contract validation, and documentation link/example validation.
• Run bounded local performance benchmarks; label 100k QPS as unverified until a representative cluster load run exists.
• Confirm no TODO/TBD/placeholders, secrets, unbounded queues, high-cardinality metric labels, extraction Lease APIs, or conflicting maxSize semantics remain.