# FutuAPI4Go SDK — Implementation Complete

> **Version:** v0.20.0 | **Date:** 2026-09-18 | **Status:** COMPLETE

## Overview

The futuapi4go SDK provides typed Go wrappers around the Futu OpenD protobuf-over-TCP protocol for market data (Qot) and trading (Trd) APIs. As of v0.20.0 (Futu Protocol v10.10.7008) it wraps all **184** Futu OpenD proto files (151 Qot, 22 Trd, 11 shared/protocol/system), with push notifications covered by typed parsers. It provides full context support, a connection state machine, graceful shutdown, rate limiting, circuit breakers, retry logic, WebSocket transport with auto-reconnect, TLS, OpenTelemetry instrumentation, a K-Line LRU cache, order pre-flight validation, audit logging, the Prediction Market / Event Contract (Moomoo US) API set, and a companion demo repository (`futuapi4go-demo`) with runnable examples. All phases from v0.5.0 through v0.20.0 are complete.

---

## API Coverage Summary

| Category | Protos | Notes |
|----------|--------|-------|
| Qot — market data | 151 | includes the shared `Qot_Common` type proto |
| Trd — trading | 22 | includes the shared `Trd_Common` type proto |
| Common / protocol / system | 11 | `Common`, `InitConnect`, `KeepAlive`, `Notify`, `GetGlobalState`, `GetUserInfo`, `GetDelayStatistics`, `UsedQuota`, `Verification`, `SkillWrapAPI`, `TestCmd` |
| **Total** | **184** | matches `ls api/proto/*.proto \| wc -l` and `find pkg/pb -name '*.pb.go' \| wc -l` |

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## Phase 1: True Gaps — COMPLETE

### Item 1a: GetDelayStatistics

- **What:** Converted from raw proto types + `WritePacket`/`ReadResponseContext` to proper typed wrappers with nil guards
- **Files changed:** `pkg/sys/system.go:224-253`
- **Added types:** `QotPushDelayStatistics`, `ReqReplyDelayStatistics`, `PlaceOrderDelayStatistics`, `DelayStatisticsItem` structs
- **Status:** ✅ DONE

### Item 1b: GetFlowSummaryResponse

- **What:** Replaced `[]*trdflowsummary.FlowSummaryInfo` with wrapped `[]*trd.FlowSummaryInfo`
- **Files changed:** `pkg/trd/position.go:580-592`
- **Details:** Nil guards on all 8 fields
- **Status:** ✅ DONE

### Item 1c: Audit Examples 21-99

- **Scope:** the companion `futuapi4go-demo` examples; ~6 verified in earlier phases; cross-layer proto field trace completed for all major examples
- **Verification results:** Gaps A–F identified and fixed (PushTicker, PushRT, KLine, StaticInfo, GetCapitalFlow, GetMarketState)
- **Status:** ✅ COMPLETE (all major gaps resolved)

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## Phase 2: Cleanup & Standardization — COMPLETE

### Item 2a: ProtoID Constant Consolidation

- **What:** `ProtoID_Qot_GetTradeDate (3225)` and `ProtoID_Qot_GetRehab (3102)` added to `pkg/constant/constant.go`
- **Files changed:** `pkg/constant/constant.go:136-137`, `pkg/qot/trade_date.go:13`, `pkg/qot/quote.go:93`, `pkg/qot/holding.go`
- **Status:** ✅ DONE

### Item 2b: S2C nil wrapError Standardization

- **What:** 50+ `fmt.Errorf("FuncName: s2c is nil")` replaced with `wrapError(..., int32(common.RetType_RetType_Unknown), "s2c is nil")` across 17 files
- **Files changed:** All `pkg/qot/`, `pkg/trd/`, `pkg/sys/` files
- **Status:** ✅ DONE

### Items 2c–2e: Verified N/A

| Item | Description | Status |
|------|-------------|--------|
| 2c | `GetXxx()` convention — deferred by design; already applied in new wrappers | N/A |
| 2d | `FutureInfo.TradeTimeList` — already complete in `pkg/qot/options.go:218` | N/A |
| 2e | `IpoData.CnExData/HkExData/UsExData` — already complete in `pkg/qot/user.go:398-406` | N/A |

---

## Phase 3: Non-Blocking — COMPLETE

### Item 3a: Demo Replace Directive

- **What:** Removed `replace github.com/shing1211/futuapi4go => ../futuapi4go` from `futuapi4go-demo/go.mod`
- **Status:** ✅ DONE

### Item 3b: GitHub Release Automation

- **What:** pushing a `v*` tag triggers `.github/workflows/release.yml`, which publishes a GitHub release using the CHANGELOG section for that version. `make release` remains a manual fallback.
- **Files changed:** `.github/workflows/release.yml`, `Makefile`
- **Status:** ✅ DONE

### Item 3c: Push.KLine Raw Proto Passthrough

- **What:** Added `PushKLine` struct in `pkg/push/qot_push.go` (13 fields). `UpdateKL.KLList` now uses `[]*PushKLine` instead of `[]*qotcommon.KLine`. Example 07 updated to use direct field access.
- **Files changed:** `pkg/push/qot_push.go`, `client/push.go`, `pkg/push/push_test.go`, `examples/07_kline_multi/main.go`
- **Status:** ✅ DONE

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## Proto Field Coverage Detail

### Core Types

| Proto Package | Message Type | Total Fields | Wrapped Fields | Missing | Status |
|--------------|-------------|--------------|----------------|---------|--------|
| `Qot_GetBasicQot` | BasicQot | 25 | 25 | — | ✅ Complete |
| `Qot_GetKL` | KLine | 13 | 13 | — | ✅ Complete |
| `Qot_GetRT` | RT (TimeShare) | 11 | 11 | — | ✅ Complete |
| `Qot_GetTicker` | Ticker | 15 | 15 | — | ✅ Complete |
| `Qot_GetOrderBook` | OrderBook | — | — | — | ✅ Complete |
| `Qot_GetBroker` | Broker | 5 | 5 | — | ✅ Complete |
| `Qot_GetCapitalFlow` | CapitalFlow | — | — | — | ✅ Complete |
| `Qot_GetCapitalDistribution` | CapitalDistribution | — | — | — | ✅ Complete |
| `Qot_GetFutureInfo` | FutureInfo | 18 | 18 | — | ✅ Complete |
| `Qot_GetIpoList` | IpoData | 31 | 31 | — | ✅ Complete |
| `Trd_GetFunds` | Funds | 28 | 28 | — | ✅ Complete |
| `Trd_GetPositionList` | Position | 25 | 25 | — | ✅ Complete |
| `Trd_GetOrderList` | Order | 29 | 29 | — | ✅ Complete |
| `Trd_GetFlowSummary` | FlowSummaryInfo | 8 | 8 | — | ✅ Complete |

### DelayStatistics Nested Types

| Type | Status |
|------|--------|
| `QotPushDelayStatistics` | ✅ Wrapped |
| `ReqReplyDelayStatistics` | ✅ Wrapped |
| `PlaceOrderDelayStatistics` | ✅ Wrapped |
| `DelayStatisticsItem` | ✅ Wrapped |

---

## Example Coverage

Counts below describe the companion `futuapi4go-demo` repository (117 examples as of v0.16.0):

| Category | Count | Status |
|----------|-------|--------|
| Total Examples | 128 | ✅ All functional |
| SDK Wrapper Usage | 90+ | ✅ Proper patterns |
| Raw Proto Requests | 7 | ⚠️ Acceptable (request types only) |
| Trade() Direct API | 6 | ⚠️ Advanced use case |

**Gaps Fixed (Phase 10 Cross-Layer Audit):**

| Gap | Description | Fix |
|-----|-------------|-----|
| A | PushTicker missing 3 fields (Time, Timestamp, PushDataType) | Added to `client/types.go` `PushTicker` |
| B | PushRT missing LastClosePrice | Added to `client/types.go` `PushRT` |
| C | KLine missing Pe, IsBlank, TurnoverRate | Added to `client/types.go` `KLine`; all 4 mappers updated |
| D | StaticInfo missing Id, Delisting, ListTimestamp, ExchType | Added to `client/types.go` `StaticInfo` |
| E | GetCapitalFlow dropping LastValidTime/LastValidTimestamp | Added `CapitalFlowResponse` wrapper type |
| F | GetMarketState dropping Code/Name | Added `MarketStateResult` wrapper type |

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## Historical Progression

| Version | Date | Major Milestones |
|---------|------|-----------------|
| v0.0.1 | 2026-04-12 | Initial push notification handler API; 100% proto field coverage on 59 wrappers |
| v0.0.5 | 2026-04-23 | Feature parity achieved; full proto field mapping; connection pool |
| v0.2.0 | 2026-04-25 | Typed enums, context-required API, wrapError standardization |
| v0.3.0 | 2026-04-25 | Buffered I/O, zero-allocation path, WebSocket infrastructure |
| v0.5.0 | 2026-04-27 | Graceful shutdown helpers, typed enum completion |
| v0.5.1 | 2026-04-28 | Enhanced error system, circuit breaker, rate limiter, retry logic |
| v0.5.2 | 2026-04-28 | GetHistoryKLPoints wrapper, UsedQuota, fluent API |
| v0.6.0 | 2026-05-16 | File splits (client, pkg/qot, pkg/trd), mock OpenD server, typed push callbacks |
| v0.7.0 | 2026-05-16 | OpenTelemetry tracing, goreleaser config, trilingual package docs |
| v0.8.0 | 2026-05-17 | Rate limiter wired, retry wired, WebSocket auto-reconnect, K-Line cache, order validation |
| v0.8.1 | 2026-05-17 | Proto field enrichment: BasicQot (25 fields), Ticker, Broker, KLine, Position, Funds, UpdateBasicQot |
| v0.8.2 | 2026-05-17 | GetTradeDate typed wrappers, SubscribeKLines typed params, input validation |
| v0.8.3 | 2026-05-17 | Plate.PlateType field added |
| v0.8.5 | 2026-05-17 | GetDelayStatistics typed wrappers, GetFlowSummaryResponse wrapped type, cross-layer field audit |

_This table records the early phases only. For the full history through v0.20.0
(protocol upgrades v10.6 → v10.10, CI, races, and API coverage), see
[CHANGELOG.md](../CHANGELOG.md)._

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## What's Left (None — All Items Complete)

All ENHANCEMENT_PLAN items are now complete. The SDK is production-ready.

| Item | Description | Priority |
|------|-------------|----------|
| — | All Phase 1, 2, 3 items complete | N/A |
| 2c | Legacy `.GetXxx()` convention — deferred by design, not a bug | N/A |

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## References

- [`CHANGELOG.md`](../CHANGELOG.md) — full version history (v0.0.1 → v0.20.0)
- [`docs/VERSION_MAP.md`](VERSION_MAP.md) — SDK-tag ↔ Futu OpenD protocol mapping
- [`docs/IMPROVEMENT_PLAN.md`](IMPROVEMENT_PLAN.md) — robustness audit (all items resolved)