Sakurasan
b2e500ff51
- 计费：19 个金额字段 float64→decimal.Decimal，DB 列保持 numeric(20,8) 零迁移； API 金额仍为 JSON number（MarshalJSONWithoutQuotes），前端零改动 - failover：保留时间预算，新增 OT_PROXY_FAILOVER_CAPS_NET/SERVER/RATE/QUOTA 按失败类型封顶换渠道次数（429/配额类瞬时失败时间预算形同虚设） - 预聚合：新增 usage_channel_hourlies（schema v10），记账事务内同步 upsert， 长窗口渠道统计走桶不再扫明细，spent_last_30d 改扫 usage_daily，v10 一次性回填幂等 - 守护：internal/arch_test.go 用 go/parser 强制分层依赖（fail-closed）
608 lines
21 KiB
Go
608 lines
21 KiB
Go
// Package proxy API 网关核心：代理 /v1/chat/completions、/v1/responses、/v1/messages、/v1/models。
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// M1 直通 OpenAI 渠道；M4 起按客户端协议 × 渠道协议自动转换（见 convert）。
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package proxy
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/openteam/server/internal/channel"
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"github.com/openteam/server/internal/pkg/apikey"
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"github.com/openteam/server/internal/pkg/crypto"
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"github.com/openteam/server/internal/pkg/ratelimit"
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"github.com/openteam/server/internal/proxy/convert"
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"github.com/openteam/server/internal/store"
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"github.com/openteam/server/internal/usage"
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"gorm.io/gorm"
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)
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const (
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CtxUserID = "proxy_user_id"
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CtxUser = "proxy_user" // Auth 阶段加载的完整用户（含余额），resolveUser 直接复用
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CtxKeyID = "proxy_key_id"
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CtxKeyModel = "proxy_key_models"
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CtxTrace = "proxy_trace_id"
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)
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type Gateway struct {
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db *gorm.DB
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ch *channel.Service
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rec *usage.Recorder
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enc *crypto.Encryptor
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lim *ratelimit.Limiter
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userRPS int
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logRaw bool
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// 上游超时兜底值（渠道 timeout_ms 非法时使用）；按超时值缓存 Transport 复用连接池。
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gwTimeout time.Duration
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maxBodyMB int // /v1 请求体上限（MB），仅用于超限报错文案
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// 故障转移给"第二个及以后的渠道"留的时间预算；超了就直接返回最后一个错误，
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// 不限制首个渠道（长回答本来就可能跑很久）。
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failoverBudget time.Duration
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// 按失败类型限制换渠道次数（0=不限）：429/配额类失败是瞬时返回，
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// 时间预算对它们形同虚设，按次数封顶才有意义。
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failoverCaps map[channel.FailKind]int
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// 流式空闲多久补一行 SSE 注释心跳（0=关闭）。反向代理的空闲超时会掐掉长思考的流。
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streamHeartbeat time.Duration
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// 流式放行前等多久内容（0=不限制）。超时未出内容取消本次尝试换下一个渠道。
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firstTokenWait time.Duration
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// 会话亲和 TTL（0=关闭）：同一会话粘住上次应答的渠道，保住上游提示词缓存。
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affinityTTL time.Duration
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// 渠道并发满载时每个候选最多排队多久（0=立刻跳过）。
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channelAcquireWait time.Duration
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// 鉴权缓存（密钥 + 用户行），0=关闭。
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auth *authCache
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aff *affinityTable
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tpMu sync.Mutex
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tps map[time.Duration]*http.Transport
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policyMu sync.Mutex
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policy modelPolicy
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// 模型目录缓存：每请求原本要查「是否存在」与「计价」两次同名查询，
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// 这里按名称缓存 catalogTTL；管理端写操作立即失效。
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modelMu sync.Mutex
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modelCat map[string]modelEntry
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modelAt time.Time
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}
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// catalogTTL 目录缓存有效期。运行期状态（冷却、健康）不受它影响，
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// 它们每次读取时重新判定；这里只缓存「配置类」数据（模型、渠道、绑定）。
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const catalogTTL = 10 * time.Second
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type modelEntry struct {
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m store.Model
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ok bool
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}
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// modelByName 取模型（带进程内缓存）；第二个返回值表示模型存在且启用。
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func (g *Gateway) modelByName(name string) (store.Model, bool) {
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g.modelMu.Lock()
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if g.modelCat != nil && time.Since(g.modelAt) < catalogTTL {
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if e, ok := g.modelCat[name]; ok {
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g.modelMu.Unlock()
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return e.m, e.ok
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}
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}
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g.modelMu.Unlock()
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var m store.Model
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err := g.db.Where("name = ? AND enabled = ?", name, true).First(&m).Error
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e := modelEntry{m: m, ok: err == nil}
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g.modelMu.Lock()
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if g.modelCat == nil || time.Since(g.modelAt) >= catalogTTL {
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g.modelCat = map[string]modelEntry{}
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g.modelAt = time.Now()
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}
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g.modelCat[name] = e
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g.modelMu.Unlock()
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return e.m, e.ok
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}
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// InvalidateAuth 清空鉴权缓存（密钥/用户/密钥白名单等写操作后调用）。
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func (g *Gateway) InvalidateAuth() { g.auth.clear() }
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// InvalidateCatalog 清空模型与渠道目录缓存（管理端改动、健康状态变化后调用）。
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func (g *Gateway) InvalidateCatalog() {
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g.modelMu.Lock()
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g.modelCat = nil
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g.modelAt = time.Time{}
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g.modelMu.Unlock()
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g.ch.InvalidateCatalog()
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}
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// modelPolicy 全局模型限制策略（来自系统配置，短时缓存）。
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type modelPolicy struct {
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allow []string
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deny []string
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at time.Time
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}
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const modelPolicyTTL = 5 * time.Second
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// ResetModelPolicy 清空全局模型限制缓存（系统配置保存后调用）。
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func (g *Gateway) ResetModelPolicy() {
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g.policyMu.Lock()
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g.policy = modelPolicy{}
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g.policyMu.Unlock()
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}
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// ChannelRuntime 渠道运行期健康快照：连续失败次数 + 冷却剩余时间 + 最近失败原因（管理后台展示）。
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func (g *Gateway) ChannelRuntime(id uint64) (fails int, remaining time.Duration, reason string) {
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return g.ch.RuntimeState(id)
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}
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// RecoverChannel 立即清除渠道的运行期冷却与失败计数（管理后台手动恢复）。
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func (g *Gateway) RecoverChannel(id uint64) {
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g.ch.ClearRuntime(id)
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}
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// globalModelRestrictions 读取全局模型允许/禁止列表（缓存 modelPolicyTTL）。
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func (g *Gateway) globalModelRestrictions() (allow, deny []string) {
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g.policyMu.Lock()
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defer g.policyMu.Unlock()
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if time.Since(g.policy.at) < modelPolicyTTL {
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return g.policy.allow, g.policy.deny
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}
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var raw string
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g.db.Model(&store.SystemConfig{}).Where("key = ?", "model_allowlist").Pluck("value", &raw)
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_ = json.Unmarshal([]byte(raw), &allow)
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raw = ""
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g.db.Model(&store.SystemConfig{}).Where("key = ?", "model_denylist").Pluck("value", &raw)
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_ = json.Unmarshal([]byte(raw), &deny)
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g.policy = modelPolicy{allow: allow, deny: deny, at: time.Now()}
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return
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}
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// checkModelAllowed 模型访问控制：用户级 > 密钥级 > 全局。
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// 1. 用户禁止列表命中 → 拒绝
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// 2. 密钥允许列表非空且不含该模型 → 拒绝（密钥级只收窄，不放宽）
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// 3. 用户允许列表非空 → 仅列表内可访问，不再看全局（管理员显式授权该用户，短路全局）
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// 4. 全局禁止命中 → 拒绝
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// 5. 全局允许列表非空 → 仅列表内可访问
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func (g *Gateway) checkModelAllowed(c *gin.Context, u *store.User, model string) bool {
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if model == "" {
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return true
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}
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if contains(u.DeniedModels, model) {
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return false
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}
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if keyAllow, ok := c.Get(CtxKeyModel); ok {
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if list, _ := keyAllow.([]string); len(list) > 0 && !contains(list, model) {
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return false
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}
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}
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if len(u.AllowedModels) > 0 {
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return contains(u.AllowedModels, model)
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}
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allow, deny := g.globalModelRestrictions()
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if contains(deny, model) {
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return false
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}
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if len(allow) > 0 {
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return contains(allow, model)
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}
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return true
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}
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// checkModelExists 拦截不存在或已禁用的模型。/v1/models 只列启用的模型，请求侧口径必须一致：
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// 禁用模型不能只是从列表消失——否则照样能调用、照样计费，管理员的下架操作形同虚设。
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func (g *Gateway) checkModelExists(c *gin.Context, model string) bool {
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if model == "" {
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apiError(c, http.StatusBadRequest, "invalid_request_error", "model is required")
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return false
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}
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if _, ok := g.modelByName(model); !ok {
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apiError(c, http.StatusNotFound, "model_not_found",
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fmt.Sprintf("The model %q does not exist or is not enabled", model))
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return false
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}
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return true
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}
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func contains(list []string, s string) bool {
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for _, v := range list {
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if v == s {
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return true
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}
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}
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return false
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}
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// Options 网关配置项。用结构体而不是十个位置参数：里面三个 time.Duration、
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// 两个 int，传错的编译期发现不了。
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type Options struct {
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UserRPS int
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LogRaw bool
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GWTimeout time.Duration // 上游超时兜底（渠道 timeout_ms 优先）
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MaxBodyMB int // /v1 请求体上限（MB）
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FailoverBudget time.Duration // 故障转移重试的时间预算
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FailoverSwitchCaps map[string]int // 按失败类型（net|server|rate|quota）限制换渠道次数，0=不限
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StreamHeartbeat time.Duration // 流式空闲心跳间隔
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FirstTokenWait time.Duration // 流式放行前等内容的最长时间（0=不限）
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AffinityTTL time.Duration // 会话亲和 TTL（0=关闭）
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ChannelAcquireWait time.Duration // 渠道满载排队时长（0=立刻跳过）
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AuthCacheTTL time.Duration // 鉴权缓存 TTL（0=关闭）
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}
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// failoverCapsFrom 把字符串键的失败类型上限配置转成 FailKind 键；未知键忽略（配置容错）。
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func failoverCapsFrom(m map[string]int) map[channel.FailKind]int {
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if len(m) == 0 {
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return nil
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}
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out := make(map[channel.FailKind]int, len(m))
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for k, v := range m {
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switch k {
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case "net":
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out[channel.FailNet] = v
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case "server":
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out[channel.FailServer] = v
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case "rate":
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out[channel.FailRate] = v
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case "quota":
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out[channel.FailQuota] = v
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}
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}
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return out
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}
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func NewGateway(db *gorm.DB, enc *crypto.Encryptor, rec *usage.Recorder, lim *ratelimit.Limiter, o Options) *Gateway {
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return &Gateway{
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db: db,
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ch: channel.NewService(db, enc),
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rec: rec,
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enc: enc,
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lim: lim,
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userRPS: o.UserRPS,
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logRaw: o.LogRaw,
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gwTimeout: o.GWTimeout,
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maxBodyMB: o.MaxBodyMB,
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failoverBudget: o.FailoverBudget,
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failoverCaps: failoverCapsFrom(o.FailoverSwitchCaps),
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streamHeartbeat: o.StreamHeartbeat,
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firstTokenWait: o.FirstTokenWait,
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affinityTTL: o.AffinityTTL,
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channelAcquireWait: o.ChannelAcquireWait,
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auth: newAuthCache(o.AuthCacheTTL),
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aff: newAffinityTable(),
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modelCat: map[string]modelEntry{},
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tps: map[time.Duration]*http.Transport{},
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}
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}
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// channelTimeout 该渠道的上游超时：timeout_ms 优先，未配置则用全局兜底值。
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func (g *Gateway) channelTimeout(ch *store.Channel) time.Duration {
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if ch.TimeoutMS > 0 {
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return time.Duration(ch.TimeoutMS) * time.Millisecond
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}
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return g.gwTimeout
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}
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// clientFor 返回带该超时的上游 client。Transport 按超时值缓存以复用连接池，
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// ResponseHeaderTimeout 只约束"连上之后多久要回首包"——流式正文不限时长，长回答不会被砍。
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// 整段时长（含读 body）由请求 context 的 deadline 控制，见 proxyOne。
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func (g *Gateway) clientFor(d time.Duration) *http.Client {
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if d < 0 {
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d = 0
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}
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g.tpMu.Lock()
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defer g.tpMu.Unlock()
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tp, ok := g.tps[d]
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if !ok {
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tp = &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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ForceAttemptHTTP2: true,
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DialContext: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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}).DialContext,
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MaxIdleConns: 100,
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MaxIdleConnsPerHost: 32,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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}
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if d > 0 {
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tp.ResponseHeaderTimeout = d
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}
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g.tps[d] = tp
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}
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return &http.Client{Transport: tp}
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}
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// Auth 代理鉴权中间件：Bearer sk-xxx → 哈希查表 → 校验状态/过期/模型白名单。
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func (g *Gateway) Auth(c *gin.Context) {
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// 先按路径确定客户端协议，保证 Auth 阶段错误也按协议格式返回
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switch c.Request.URL.Path {
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case "/v1/messages":
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c.Set("protocol", convert.ProtoMessages)
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case "/v1/responses":
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c.Set("protocol", convert.ProtoResponses)
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case "/v1/models":
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// 模型目录两条协议共用同一路径，只能靠头区分：Anthropic 客户端带
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// x-api-key / anthropic-version，OpenAI 客户端从不发这两个头。
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if c.GetHeader("x-api-key") != "" || c.GetHeader("anthropic-version") != "" {
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c.Set("protocol", convert.ProtoMessages)
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} else {
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c.Set("protocol", convert.ProtoChat)
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}
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default:
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c.Set("protocol", convert.ProtoChat)
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}
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auth := c.GetHeader("Authorization")
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key := strings.TrimPrefix(auth, "Bearer ")
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key = strings.TrimSpace(key)
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if key == "" {
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// Anthropic 客户端（Claude Code / SDK）用 x-api-key 头而不是 Authorization
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key = strings.TrimSpace(c.GetHeader("x-api-key"))
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}
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if !apikey.Valid(key) {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key format. Expected: Authorization: Bearer sk-ot-... or x-api-key: sk-ot-...")
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c.Abort()
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return
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}
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hash := apikey.Hash(key)
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// 命中缓存时省掉两条随机读；状态/过期仍在下面按当前时间判定
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k, u, ok := g.auth.get(hash)
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if !ok {
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if err := g.db.Where("key_hash = ? AND status = ?", hash, store.KeyStatusActive).First(&k).Error; err != nil {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key")
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c.Abort()
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return
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}
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if err := g.db.First(&u, k.UserID).Error; err != nil {
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apiError(c, http.StatusForbidden, "user_disabled", "User account is disabled")
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c.Abort()
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return
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}
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g.auth.put(hash, k, u)
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}
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// 缓存值可能是 TTL 内的旧状态：每次请求都按当前时间重判
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if k.Status != store.KeyStatusActive {
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apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key")
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c.Abort()
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return
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}
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if u.Status != store.UserStatusActive {
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apiError(c, http.StatusForbidden, "user_disabled", "User account is disabled")
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c.Abort()
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return
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}
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if k.ExpiresAt != nil && time.Now().After(*k.ExpiresAt) {
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apiError(c, http.StatusUnauthorized, "key_expired", "API key has expired")
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c.Abort()
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return
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}
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// 限流与配额（内存计数）
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if g.lim != nil {
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if k.QuotaRequestsPerDay != nil && !g.lim.AllowRequestDaily(k.ID, *k.QuotaRequestsPerDay) {
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apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Daily request quota exceeded for this API key")
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c.Abort()
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return
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}
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if k.QuotaTokensPerDay != nil && g.lim.TokensUsed(k.ID) >= *k.QuotaTokensPerDay {
|
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apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Daily token quota exceeded for this API key")
|
||
c.Abort()
|
||
return
|
||
}
|
||
if !g.lim.AllowUserRate(u.ID, g.userRPS) {
|
||
apiError(c, http.StatusTooManyRequests, "rate_limit_exceeded", "Too many requests. Please slow down.")
|
||
c.Abort()
|
||
return
|
||
}
|
||
}
|
||
|
||
c.Set(CtxUser, &u)
|
||
c.Set(CtxUserID, u.ID)
|
||
c.Set(CtxKeyID, k.ID)
|
||
c.Set(CtxKeyModel, k.AllowedModels)
|
||
c.Set(CtxTrace, newTraceID())
|
||
// last_used_at 按分钟节流：纯展示字段，不值得每请求一次 DB 写（高 QPS 下是可观开销）。
|
||
// 密钥行可能来自缓存（时间戳不会自己变），所以节流按缓存里的 touch 记录判断。
|
||
if g.auth.shouldTouch(k.ID, time.Minute) {
|
||
g.db.Model(&store.APIKey{}).Where("id = ?", k.ID).Update("last_used_at", time.Now())
|
||
}
|
||
c.Next()
|
||
}
|
||
|
||
// Handle 路由到对应协议处理器。
|
||
func (g *Gateway) Handle(c *gin.Context) {
|
||
switch {
|
||
case c.Request.URL.Path == "/v1/chat/completions":
|
||
g.chatCompletions(c)
|
||
case c.Request.URL.Path == "/v1/responses":
|
||
g.responses(c)
|
||
case c.Request.URL.Path == "/v1/messages":
|
||
g.messages(c)
|
||
case c.Request.URL.Path == "/v1/models" && c.Request.Method == http.MethodGet:
|
||
g.models(c)
|
||
default:
|
||
apiError(c, http.StatusNotFound, "not_found", "Unknown endpoint: "+c.Request.URL.Path)
|
||
}
|
||
}
|
||
|
||
// models GET /v1/models：返回调用方真正能用的模型。
|
||
// 口径与选路一致（启用 + 至少绑定一个启用且健康的渠道），再叠加该用户/密钥的模型白名单——
|
||
// 否则被限制的模型名照样泄漏在列表里，客户端试了才知道 403。
|
||
// 按客户端协议返回对应形状，并带上目录元数据（上下文长度、能力位）；价格不外泄。
|
||
func (g *Gateway) models(c *gin.Context) {
|
||
u, ok := g.resolveUser(c)
|
||
if !ok {
|
||
return
|
||
}
|
||
ids := g.ch.AvailableModelIDs()
|
||
if len(ids) == 0 {
|
||
g.writeModelList(c, nil)
|
||
return
|
||
}
|
||
var ms []store.Model
|
||
if err := g.db.Where("id IN ? AND enabled = ?", ids, true).Order("sort ASC, id ASC").Find(&ms).Error; err != nil {
|
||
apiError(c, http.StatusInternalServerError, "internal_error", "failed to load models")
|
||
return
|
||
}
|
||
out := make([]store.Model, 0, len(ms))
|
||
for _, m := range ms {
|
||
if g.checkModelAllowed(c, u, m.Name) {
|
||
out = append(out, m)
|
||
}
|
||
}
|
||
g.writeModelList(c, out)
|
||
}
|
||
|
||
func (g *Gateway) writeModelList(c *gin.Context, ms []store.Model) {
|
||
if p, _ := c.Get("protocol"); p == convert.ProtoMessages {
|
||
data := make([]gin.H, 0, len(ms))
|
||
for _, m := range ms {
|
||
data = append(data, gin.H{
|
||
"type": "model",
|
||
"id": m.Name,
|
||
"display_name": m.Name,
|
||
"created_at": m.CreatedAt.UTC().Format(time.RFC3339),
|
||
"context_length": m.ContextLength,
|
||
"capabilities": gin.H{
|
||
"tools": m.SupportsTools, "vision": m.SupportsVision, "reasoning": m.SupportsReasoning,
|
||
},
|
||
})
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"data": data, "has_more": false})
|
||
return
|
||
}
|
||
data := make([]gin.H, 0, len(ms))
|
||
for _, m := range ms {
|
||
item := gin.H{
|
||
"id": m.Name, "object": "model",
|
||
"created": m.CreatedAt.Unix(), "owned_by": "openteam",
|
||
}
|
||
if m.ContextLength > 0 {
|
||
item["context_length"] = m.ContextLength
|
||
}
|
||
if m.SupportsTools || m.SupportsVision || m.SupportsReasoning {
|
||
item["capabilities"] = gin.H{
|
||
"tools": m.SupportsTools, "vision": m.SupportsVision, "reasoning": m.SupportsReasoning,
|
||
}
|
||
}
|
||
data = append(data, item)
|
||
}
|
||
c.JSON(http.StatusOK, gin.H{"object": "list", "data": data})
|
||
}
|
||
|
||
// candidateChannels 返回可用渠道候选（按模型绑定优先，退化全局；携带模型映射）。
|
||
func (g *Gateway) candidateChannels(model string) []channel.Candidate {
|
||
return g.ch.Candidates(model)
|
||
}
|
||
|
||
// resolveUser 取当前用户（含余额）。Auth 中间件已查过一次并放入上下文，
|
||
// handler 里直接复用，省掉每请求一次重复查询。
|
||
func (g *Gateway) resolveUser(c *gin.Context) (*store.User, bool) {
|
||
if u, ok := c.Get(CtxUser); ok {
|
||
if u2, ok := u.(*store.User); ok {
|
||
return u2, true
|
||
}
|
||
}
|
||
uid, _ := c.Get(CtxUserID)
|
||
var u store.User
|
||
if err := g.db.First(&u, uid).Error; err != nil {
|
||
apiError(c, http.StatusUnauthorized, "invalid_api_key", "Invalid API key")
|
||
return nil, false
|
||
}
|
||
return &u, true
|
||
}
|
||
|
||
// checkBalance 余额不足返回 402（PLANNING §4.4.3）。
|
||
func (g *Gateway) checkBalance(c *gin.Context, u *store.User) bool {
|
||
if !u.Balance.IsPositive() {
|
||
apiError(c, http.StatusPaymentRequired, "insufficient_balance", "Insufficient balance. Please recharge or contact admin.")
|
||
return false
|
||
}
|
||
return true
|
||
}
|
||
|
||
// ---------------------------------------------------------------------------
|
||
// 协议分派
|
||
|
||
func upstreamPath(proto string) string {
|
||
switch proto {
|
||
case convert.ProtoMessages:
|
||
return "/messages"
|
||
case convert.ProtoResponses:
|
||
return "/responses"
|
||
default:
|
||
return "/chat/completions"
|
||
}
|
||
}
|
||
|
||
// upstreamPlan 描述一次代理请求的上游访问方式。
|
||
type upstreamPlan struct {
|
||
proto string // 上游协议（用于分协议 base_url）
|
||
path string // 上游路径
|
||
body []byte // 已转换的请求体
|
||
lineConv func([]byte) []byte // 流式逐行转换（nil=直通）
|
||
bodyConv func([]byte) ([]byte, error) // 非流式响应体转换（nil=直通）
|
||
}
|
||
|
||
// conversionTarget 决定客户端协议在渠道上的处理方式：
|
||
// 渠道声明支持该协议则直通（返回原协议）；否则转为其首选支持协议（chat > messages > responses）。
|
||
func conversionTarget(formats []string, clientProto string) string {
|
||
for _, f := range formats {
|
||
if f == clientProto {
|
||
return clientProto
|
||
}
|
||
}
|
||
for _, p := range []string{convert.ProtoChat, convert.ProtoMessages, convert.ProtoResponses} {
|
||
for _, f := range formats {
|
||
if f == p {
|
||
return p
|
||
}
|
||
}
|
||
}
|
||
return ""
|
||
}
|
||
|
||
// prepareUpstream 计算上游访问计划：渠道声明支持客户端协议则直通，否则转换；
|
||
// 应用模型名称映射（upstream_model）。
|
||
func prepareUpstream(ch *store.Channel, clientProto string, body []byte, upstreamModel string) (*upstreamPlan, error) {
|
||
target := conversionTarget(ch.FormatsEffective(), clientProto)
|
||
if target == "" {
|
||
return nil, fmt.Errorf("channel %q declares no supported protocol format", ch.Name)
|
||
}
|
||
plan := &upstreamPlan{proto: target, path: upstreamPath(target), body: body}
|
||
if target != clientProto {
|
||
converted, err := convert.ConvertRequest(body, clientProto, target)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
plan.body = converted
|
||
plan.lineConv = convert.NewStreamTransformer(target, clientProto)
|
||
plan.bodyConv = func(b []byte) ([]byte, error) { return convert.ConvertResponse(b, target, clientProto) }
|
||
}
|
||
// 模型名称映射：把请求体 model 字段改写为渠道侧的 upstream_model
|
||
if upstreamModel != "" {
|
||
if out, err := rewriteModel(plan.body, upstreamModel); err == nil {
|
||
plan.body = out
|
||
}
|
||
}
|
||
return plan, nil
|
||
}
|
||
|
||
// rewriteModel 改写请求体顶层的 model 字段（模型映射）。
|
||
// 定点替换而不是整包 unmarshal/marshal：后者在 100KB 请求体上实测 ~585µs、
|
||
// 470KB 分配，而这里只有一次扫描 + 拼接。
|
||
func rewriteModel(body []byte, model string) ([]byte, error) {
|
||
out, ok := rewriteModelField(body, model)
|
||
if !ok {
|
||
return body, nil // 没有顶层 model（非法或空体）：原样转发，交给上游判
|
||
}
|
||
return out, nil
|
||
}
|
||
|
||
var errNoChannel = errors.New("no available channel")
|