12b33f4ea4
- Fix bulk edit: send 0 instead of null/NaN to clear load_factor - Fix edit modal: explicit NaN check instead of implicit falsy - Fix create modal: use ?? instead of || for load_factor - Add load_factor upper limit validation (max 10000) - Add //go:build unit tag and self-contained intPtrHelper in test - Add design intent comments on WaitPlan.MaxConcurrency
912 lines
25 KiB
Go
912 lines
25 KiB
Go
package service
|
||
|
||
import (
|
||
"container/heap"
|
||
"context"
|
||
"errors"
|
||
"hash/fnv"
|
||
"math"
|
||
"sort"
|
||
"strconv"
|
||
"strings"
|
||
"sync"
|
||
"sync/atomic"
|
||
"time"
|
||
)
|
||
|
||
const (
|
||
openAIAccountScheduleLayerPreviousResponse = "previous_response_id"
|
||
openAIAccountScheduleLayerSessionSticky = "session_hash"
|
||
openAIAccountScheduleLayerLoadBalance = "load_balance"
|
||
)
|
||
|
||
type OpenAIAccountScheduleRequest struct {
|
||
GroupID *int64
|
||
SessionHash string
|
||
StickyAccountID int64
|
||
PreviousResponseID string
|
||
RequestedModel string
|
||
RequiredTransport OpenAIUpstreamTransport
|
||
ExcludedIDs map[int64]struct{}
|
||
}
|
||
|
||
type OpenAIAccountScheduleDecision struct {
|
||
Layer string
|
||
StickyPreviousHit bool
|
||
StickySessionHit bool
|
||
CandidateCount int
|
||
TopK int
|
||
LatencyMs int64
|
||
LoadSkew float64
|
||
SelectedAccountID int64
|
||
SelectedAccountType string
|
||
}
|
||
|
||
type OpenAIAccountSchedulerMetricsSnapshot struct {
|
||
SelectTotal int64
|
||
StickyPreviousHitTotal int64
|
||
StickySessionHitTotal int64
|
||
LoadBalanceSelectTotal int64
|
||
AccountSwitchTotal int64
|
||
SchedulerLatencyMsTotal int64
|
||
SchedulerLatencyMsAvg float64
|
||
StickyHitRatio float64
|
||
AccountSwitchRate float64
|
||
LoadSkewAvg float64
|
||
RuntimeStatsAccountCount int
|
||
}
|
||
|
||
type OpenAIAccountScheduler interface {
|
||
Select(ctx context.Context, req OpenAIAccountScheduleRequest) (*AccountSelectionResult, OpenAIAccountScheduleDecision, error)
|
||
ReportResult(accountID int64, success bool, firstTokenMs *int)
|
||
ReportSwitch()
|
||
SnapshotMetrics() OpenAIAccountSchedulerMetricsSnapshot
|
||
}
|
||
|
||
type openAIAccountSchedulerMetrics struct {
|
||
selectTotal atomic.Int64
|
||
stickyPreviousHitTotal atomic.Int64
|
||
stickySessionHitTotal atomic.Int64
|
||
loadBalanceSelectTotal atomic.Int64
|
||
accountSwitchTotal atomic.Int64
|
||
latencyMsTotal atomic.Int64
|
||
loadSkewMilliTotal atomic.Int64
|
||
}
|
||
|
||
func (m *openAIAccountSchedulerMetrics) recordSelect(decision OpenAIAccountScheduleDecision) {
|
||
if m == nil {
|
||
return
|
||
}
|
||
m.selectTotal.Add(1)
|
||
m.latencyMsTotal.Add(decision.LatencyMs)
|
||
m.loadSkewMilliTotal.Add(int64(math.Round(decision.LoadSkew * 1000)))
|
||
if decision.StickyPreviousHit {
|
||
m.stickyPreviousHitTotal.Add(1)
|
||
}
|
||
if decision.StickySessionHit {
|
||
m.stickySessionHitTotal.Add(1)
|
||
}
|
||
if decision.Layer == openAIAccountScheduleLayerLoadBalance {
|
||
m.loadBalanceSelectTotal.Add(1)
|
||
}
|
||
}
|
||
|
||
func (m *openAIAccountSchedulerMetrics) recordSwitch() {
|
||
if m == nil {
|
||
return
|
||
}
|
||
m.accountSwitchTotal.Add(1)
|
||
}
|
||
|
||
type openAIAccountRuntimeStats struct {
|
||
accounts sync.Map
|
||
accountCount atomic.Int64
|
||
}
|
||
|
||
type openAIAccountRuntimeStat struct {
|
||
errorRateEWMABits atomic.Uint64
|
||
ttftEWMABits atomic.Uint64
|
||
}
|
||
|
||
func newOpenAIAccountRuntimeStats() *openAIAccountRuntimeStats {
|
||
return &openAIAccountRuntimeStats{}
|
||
}
|
||
|
||
func (s *openAIAccountRuntimeStats) loadOrCreate(accountID int64) *openAIAccountRuntimeStat {
|
||
if value, ok := s.accounts.Load(accountID); ok {
|
||
stat, _ := value.(*openAIAccountRuntimeStat)
|
||
if stat != nil {
|
||
return stat
|
||
}
|
||
}
|
||
|
||
stat := &openAIAccountRuntimeStat{}
|
||
stat.ttftEWMABits.Store(math.Float64bits(math.NaN()))
|
||
actual, loaded := s.accounts.LoadOrStore(accountID, stat)
|
||
if !loaded {
|
||
s.accountCount.Add(1)
|
||
return stat
|
||
}
|
||
existing, _ := actual.(*openAIAccountRuntimeStat)
|
||
if existing != nil {
|
||
return existing
|
||
}
|
||
return stat
|
||
}
|
||
|
||
func updateEWMAAtomic(target *atomic.Uint64, sample float64, alpha float64) {
|
||
for {
|
||
oldBits := target.Load()
|
||
oldValue := math.Float64frombits(oldBits)
|
||
newValue := alpha*sample + (1-alpha)*oldValue
|
||
if target.CompareAndSwap(oldBits, math.Float64bits(newValue)) {
|
||
return
|
||
}
|
||
}
|
||
}
|
||
|
||
func (s *openAIAccountRuntimeStats) report(accountID int64, success bool, firstTokenMs *int) {
|
||
if s == nil || accountID <= 0 {
|
||
return
|
||
}
|
||
const alpha = 0.2
|
||
stat := s.loadOrCreate(accountID)
|
||
|
||
errorSample := 1.0
|
||
if success {
|
||
errorSample = 0.0
|
||
}
|
||
updateEWMAAtomic(&stat.errorRateEWMABits, errorSample, alpha)
|
||
|
||
if firstTokenMs != nil && *firstTokenMs > 0 {
|
||
ttft := float64(*firstTokenMs)
|
||
ttftBits := math.Float64bits(ttft)
|
||
for {
|
||
oldBits := stat.ttftEWMABits.Load()
|
||
oldValue := math.Float64frombits(oldBits)
|
||
if math.IsNaN(oldValue) {
|
||
if stat.ttftEWMABits.CompareAndSwap(oldBits, ttftBits) {
|
||
break
|
||
}
|
||
continue
|
||
}
|
||
newValue := alpha*ttft + (1-alpha)*oldValue
|
||
if stat.ttftEWMABits.CompareAndSwap(oldBits, math.Float64bits(newValue)) {
|
||
break
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func (s *openAIAccountRuntimeStats) snapshot(accountID int64) (errorRate float64, ttft float64, hasTTFT bool) {
|
||
if s == nil || accountID <= 0 {
|
||
return 0, 0, false
|
||
}
|
||
value, ok := s.accounts.Load(accountID)
|
||
if !ok {
|
||
return 0, 0, false
|
||
}
|
||
stat, _ := value.(*openAIAccountRuntimeStat)
|
||
if stat == nil {
|
||
return 0, 0, false
|
||
}
|
||
errorRate = clamp01(math.Float64frombits(stat.errorRateEWMABits.Load()))
|
||
ttftValue := math.Float64frombits(stat.ttftEWMABits.Load())
|
||
if math.IsNaN(ttftValue) {
|
||
return errorRate, 0, false
|
||
}
|
||
return errorRate, ttftValue, true
|
||
}
|
||
|
||
func (s *openAIAccountRuntimeStats) size() int {
|
||
if s == nil {
|
||
return 0
|
||
}
|
||
return int(s.accountCount.Load())
|
||
}
|
||
|
||
type defaultOpenAIAccountScheduler struct {
|
||
service *OpenAIGatewayService
|
||
metrics openAIAccountSchedulerMetrics
|
||
stats *openAIAccountRuntimeStats
|
||
}
|
||
|
||
func newDefaultOpenAIAccountScheduler(service *OpenAIGatewayService, stats *openAIAccountRuntimeStats) OpenAIAccountScheduler {
|
||
if stats == nil {
|
||
stats = newOpenAIAccountRuntimeStats()
|
||
}
|
||
return &defaultOpenAIAccountScheduler{
|
||
service: service,
|
||
stats: stats,
|
||
}
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) Select(
|
||
ctx context.Context,
|
||
req OpenAIAccountScheduleRequest,
|
||
) (*AccountSelectionResult, OpenAIAccountScheduleDecision, error) {
|
||
decision := OpenAIAccountScheduleDecision{}
|
||
start := time.Now()
|
||
defer func() {
|
||
decision.LatencyMs = time.Since(start).Milliseconds()
|
||
s.metrics.recordSelect(decision)
|
||
}()
|
||
|
||
previousResponseID := strings.TrimSpace(req.PreviousResponseID)
|
||
if previousResponseID != "" {
|
||
selection, err := s.service.SelectAccountByPreviousResponseID(
|
||
ctx,
|
||
req.GroupID,
|
||
previousResponseID,
|
||
req.RequestedModel,
|
||
req.ExcludedIDs,
|
||
)
|
||
if err != nil {
|
||
return nil, decision, err
|
||
}
|
||
if selection != nil && selection.Account != nil {
|
||
if !s.isAccountTransportCompatible(selection.Account, req.RequiredTransport) {
|
||
selection = nil
|
||
}
|
||
}
|
||
if selection != nil && selection.Account != nil {
|
||
decision.Layer = openAIAccountScheduleLayerPreviousResponse
|
||
decision.StickyPreviousHit = true
|
||
decision.SelectedAccountID = selection.Account.ID
|
||
decision.SelectedAccountType = selection.Account.Type
|
||
if req.SessionHash != "" {
|
||
_ = s.service.BindStickySession(ctx, req.GroupID, req.SessionHash, selection.Account.ID)
|
||
}
|
||
return selection, decision, nil
|
||
}
|
||
}
|
||
|
||
selection, err := s.selectBySessionHash(ctx, req)
|
||
if err != nil {
|
||
return nil, decision, err
|
||
}
|
||
if selection != nil && selection.Account != nil {
|
||
decision.Layer = openAIAccountScheduleLayerSessionSticky
|
||
decision.StickySessionHit = true
|
||
decision.SelectedAccountID = selection.Account.ID
|
||
decision.SelectedAccountType = selection.Account.Type
|
||
return selection, decision, nil
|
||
}
|
||
|
||
selection, candidateCount, topK, loadSkew, err := s.selectByLoadBalance(ctx, req)
|
||
decision.Layer = openAIAccountScheduleLayerLoadBalance
|
||
decision.CandidateCount = candidateCount
|
||
decision.TopK = topK
|
||
decision.LoadSkew = loadSkew
|
||
if err != nil {
|
||
return nil, decision, err
|
||
}
|
||
if selection != nil && selection.Account != nil {
|
||
decision.SelectedAccountID = selection.Account.ID
|
||
decision.SelectedAccountType = selection.Account.Type
|
||
}
|
||
return selection, decision, nil
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) selectBySessionHash(
|
||
ctx context.Context,
|
||
req OpenAIAccountScheduleRequest,
|
||
) (*AccountSelectionResult, error) {
|
||
sessionHash := strings.TrimSpace(req.SessionHash)
|
||
if sessionHash == "" || s == nil || s.service == nil || s.service.cache == nil {
|
||
return nil, nil
|
||
}
|
||
|
||
accountID := req.StickyAccountID
|
||
if accountID <= 0 {
|
||
var err error
|
||
accountID, err = s.service.getStickySessionAccountID(ctx, req.GroupID, sessionHash)
|
||
if err != nil || accountID <= 0 {
|
||
return nil, nil
|
||
}
|
||
}
|
||
if accountID <= 0 {
|
||
return nil, nil
|
||
}
|
||
if req.ExcludedIDs != nil {
|
||
if _, excluded := req.ExcludedIDs[accountID]; excluded {
|
||
return nil, nil
|
||
}
|
||
}
|
||
|
||
account, err := s.service.getSchedulableAccount(ctx, accountID)
|
||
if err != nil || account == nil {
|
||
_ = s.service.deleteStickySessionAccountID(ctx, req.GroupID, sessionHash)
|
||
return nil, nil
|
||
}
|
||
if shouldClearStickySession(account, req.RequestedModel) || !account.IsOpenAI() {
|
||
_ = s.service.deleteStickySessionAccountID(ctx, req.GroupID, sessionHash)
|
||
return nil, nil
|
||
}
|
||
if req.RequestedModel != "" && !account.IsModelSupported(req.RequestedModel) {
|
||
return nil, nil
|
||
}
|
||
if !s.isAccountTransportCompatible(account, req.RequiredTransport) {
|
||
_ = s.service.deleteStickySessionAccountID(ctx, req.GroupID, sessionHash)
|
||
return nil, nil
|
||
}
|
||
|
||
result, acquireErr := s.service.tryAcquireAccountSlot(ctx, accountID, account.Concurrency)
|
||
if acquireErr == nil && result.Acquired {
|
||
_ = s.service.refreshStickySessionTTL(ctx, req.GroupID, sessionHash, s.service.openAIWSSessionStickyTTL())
|
||
return &AccountSelectionResult{
|
||
Account: account,
|
||
Acquired: true,
|
||
ReleaseFunc: result.ReleaseFunc,
|
||
}, nil
|
||
}
|
||
|
||
cfg := s.service.schedulingConfig()
|
||
// WaitPlan.MaxConcurrency 使用 Concurrency（非 EffectiveLoadFactor），因为 WaitPlan 控制的是 Redis 实际并发槽位等待。
|
||
if s.service.concurrencyService != nil {
|
||
return &AccountSelectionResult{
|
||
Account: account,
|
||
WaitPlan: &AccountWaitPlan{
|
||
AccountID: accountID,
|
||
MaxConcurrency: account.Concurrency,
|
||
Timeout: cfg.StickySessionWaitTimeout,
|
||
MaxWaiting: cfg.StickySessionMaxWaiting,
|
||
},
|
||
}, nil
|
||
}
|
||
return nil, nil
|
||
}
|
||
|
||
type openAIAccountCandidateScore struct {
|
||
account *Account
|
||
loadInfo *AccountLoadInfo
|
||
score float64
|
||
errorRate float64
|
||
ttft float64
|
||
hasTTFT bool
|
||
}
|
||
|
||
type openAIAccountCandidateHeap []openAIAccountCandidateScore
|
||
|
||
func (h openAIAccountCandidateHeap) Len() int {
|
||
return len(h)
|
||
}
|
||
|
||
func (h openAIAccountCandidateHeap) Less(i, j int) bool {
|
||
// 最小堆根节点保存“最差”候选，便于 O(log k) 维护 topK。
|
||
return isOpenAIAccountCandidateBetter(h[j], h[i])
|
||
}
|
||
|
||
func (h openAIAccountCandidateHeap) Swap(i, j int) {
|
||
h[i], h[j] = h[j], h[i]
|
||
}
|
||
|
||
func (h *openAIAccountCandidateHeap) Push(x any) {
|
||
candidate, ok := x.(openAIAccountCandidateScore)
|
||
if !ok {
|
||
panic("openAIAccountCandidateHeap: invalid element type")
|
||
}
|
||
*h = append(*h, candidate)
|
||
}
|
||
|
||
func (h *openAIAccountCandidateHeap) Pop() any {
|
||
old := *h
|
||
n := len(old)
|
||
last := old[n-1]
|
||
*h = old[:n-1]
|
||
return last
|
||
}
|
||
|
||
func isOpenAIAccountCandidateBetter(left openAIAccountCandidateScore, right openAIAccountCandidateScore) bool {
|
||
if left.score != right.score {
|
||
return left.score > right.score
|
||
}
|
||
if left.account.Priority != right.account.Priority {
|
||
return left.account.Priority < right.account.Priority
|
||
}
|
||
if left.loadInfo.LoadRate != right.loadInfo.LoadRate {
|
||
return left.loadInfo.LoadRate < right.loadInfo.LoadRate
|
||
}
|
||
if left.loadInfo.WaitingCount != right.loadInfo.WaitingCount {
|
||
return left.loadInfo.WaitingCount < right.loadInfo.WaitingCount
|
||
}
|
||
return left.account.ID < right.account.ID
|
||
}
|
||
|
||
func selectTopKOpenAICandidates(candidates []openAIAccountCandidateScore, topK int) []openAIAccountCandidateScore {
|
||
if len(candidates) == 0 {
|
||
return nil
|
||
}
|
||
if topK <= 0 {
|
||
topK = 1
|
||
}
|
||
if topK >= len(candidates) {
|
||
ranked := append([]openAIAccountCandidateScore(nil), candidates...)
|
||
sort.Slice(ranked, func(i, j int) bool {
|
||
return isOpenAIAccountCandidateBetter(ranked[i], ranked[j])
|
||
})
|
||
return ranked
|
||
}
|
||
|
||
best := make(openAIAccountCandidateHeap, 0, topK)
|
||
for _, candidate := range candidates {
|
||
if len(best) < topK {
|
||
heap.Push(&best, candidate)
|
||
continue
|
||
}
|
||
if isOpenAIAccountCandidateBetter(candidate, best[0]) {
|
||
best[0] = candidate
|
||
heap.Fix(&best, 0)
|
||
}
|
||
}
|
||
|
||
ranked := make([]openAIAccountCandidateScore, len(best))
|
||
copy(ranked, best)
|
||
sort.Slice(ranked, func(i, j int) bool {
|
||
return isOpenAIAccountCandidateBetter(ranked[i], ranked[j])
|
||
})
|
||
return ranked
|
||
}
|
||
|
||
type openAISelectionRNG struct {
|
||
state uint64
|
||
}
|
||
|
||
func newOpenAISelectionRNG(seed uint64) openAISelectionRNG {
|
||
if seed == 0 {
|
||
seed = 0x9e3779b97f4a7c15
|
||
}
|
||
return openAISelectionRNG{state: seed}
|
||
}
|
||
|
||
func (r *openAISelectionRNG) nextUint64() uint64 {
|
||
// xorshift64*
|
||
x := r.state
|
||
x ^= x >> 12
|
||
x ^= x << 25
|
||
x ^= x >> 27
|
||
r.state = x
|
||
return x * 2685821657736338717
|
||
}
|
||
|
||
func (r *openAISelectionRNG) nextFloat64() float64 {
|
||
// [0,1)
|
||
return float64(r.nextUint64()>>11) / (1 << 53)
|
||
}
|
||
|
||
func deriveOpenAISelectionSeed(req OpenAIAccountScheduleRequest) uint64 {
|
||
hasher := fnv.New64a()
|
||
writeValue := func(value string) {
|
||
trimmed := strings.TrimSpace(value)
|
||
if trimmed == "" {
|
||
return
|
||
}
|
||
_, _ = hasher.Write([]byte(trimmed))
|
||
_, _ = hasher.Write([]byte{0})
|
||
}
|
||
|
||
writeValue(req.SessionHash)
|
||
writeValue(req.PreviousResponseID)
|
||
writeValue(req.RequestedModel)
|
||
if req.GroupID != nil {
|
||
_, _ = hasher.Write([]byte(strconv.FormatInt(*req.GroupID, 10)))
|
||
}
|
||
|
||
seed := hasher.Sum64()
|
||
// 对“无会话锚点”的纯负载均衡请求引入时间熵，避免固定命中同一账号。
|
||
if strings.TrimSpace(req.SessionHash) == "" && strings.TrimSpace(req.PreviousResponseID) == "" {
|
||
seed ^= uint64(time.Now().UnixNano())
|
||
}
|
||
if seed == 0 {
|
||
seed = uint64(time.Now().UnixNano()) ^ 0x9e3779b97f4a7c15
|
||
}
|
||
return seed
|
||
}
|
||
|
||
func buildOpenAIWeightedSelectionOrder(
|
||
candidates []openAIAccountCandidateScore,
|
||
req OpenAIAccountScheduleRequest,
|
||
) []openAIAccountCandidateScore {
|
||
if len(candidates) <= 1 {
|
||
return append([]openAIAccountCandidateScore(nil), candidates...)
|
||
}
|
||
|
||
pool := append([]openAIAccountCandidateScore(nil), candidates...)
|
||
weights := make([]float64, len(pool))
|
||
minScore := pool[0].score
|
||
for i := 1; i < len(pool); i++ {
|
||
if pool[i].score < minScore {
|
||
minScore = pool[i].score
|
||
}
|
||
}
|
||
for i := range pool {
|
||
// 将 top-K 分值平移到正区间，避免“单一最高分账号”长期垄断。
|
||
weight := (pool[i].score - minScore) + 1.0
|
||
if math.IsNaN(weight) || math.IsInf(weight, 0) || weight <= 0 {
|
||
weight = 1.0
|
||
}
|
||
weights[i] = weight
|
||
}
|
||
|
||
order := make([]openAIAccountCandidateScore, 0, len(pool))
|
||
rng := newOpenAISelectionRNG(deriveOpenAISelectionSeed(req))
|
||
for len(pool) > 0 {
|
||
total := 0.0
|
||
for _, w := range weights {
|
||
total += w
|
||
}
|
||
|
||
selectedIdx := 0
|
||
if total > 0 {
|
||
r := rng.nextFloat64() * total
|
||
acc := 0.0
|
||
for i, w := range weights {
|
||
acc += w
|
||
if r <= acc {
|
||
selectedIdx = i
|
||
break
|
||
}
|
||
}
|
||
} else {
|
||
selectedIdx = int(rng.nextUint64() % uint64(len(pool)))
|
||
}
|
||
|
||
order = append(order, pool[selectedIdx])
|
||
pool = append(pool[:selectedIdx], pool[selectedIdx+1:]...)
|
||
weights = append(weights[:selectedIdx], weights[selectedIdx+1:]...)
|
||
}
|
||
return order
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) selectByLoadBalance(
|
||
ctx context.Context,
|
||
req OpenAIAccountScheduleRequest,
|
||
) (*AccountSelectionResult, int, int, float64, error) {
|
||
accounts, err := s.service.listSchedulableAccounts(ctx, req.GroupID)
|
||
if err != nil {
|
||
return nil, 0, 0, 0, err
|
||
}
|
||
if len(accounts) == 0 {
|
||
return nil, 0, 0, 0, errors.New("no available OpenAI accounts")
|
||
}
|
||
|
||
filtered := make([]*Account, 0, len(accounts))
|
||
loadReq := make([]AccountWithConcurrency, 0, len(accounts))
|
||
for i := range accounts {
|
||
account := &accounts[i]
|
||
if req.ExcludedIDs != nil {
|
||
if _, excluded := req.ExcludedIDs[account.ID]; excluded {
|
||
continue
|
||
}
|
||
}
|
||
if !account.IsSchedulable() || !account.IsOpenAI() {
|
||
continue
|
||
}
|
||
if req.RequestedModel != "" && !account.IsModelSupported(req.RequestedModel) {
|
||
continue
|
||
}
|
||
if !s.isAccountTransportCompatible(account, req.RequiredTransport) {
|
||
continue
|
||
}
|
||
filtered = append(filtered, account)
|
||
loadReq = append(loadReq, AccountWithConcurrency{
|
||
ID: account.ID,
|
||
MaxConcurrency: account.EffectiveLoadFactor(),
|
||
})
|
||
}
|
||
if len(filtered) == 0 {
|
||
return nil, 0, 0, 0, errors.New("no available OpenAI accounts")
|
||
}
|
||
|
||
loadMap := map[int64]*AccountLoadInfo{}
|
||
if s.service.concurrencyService != nil {
|
||
if batchLoad, loadErr := s.service.concurrencyService.GetAccountsLoadBatch(ctx, loadReq); loadErr == nil {
|
||
loadMap = batchLoad
|
||
}
|
||
}
|
||
|
||
minPriority, maxPriority := filtered[0].Priority, filtered[0].Priority
|
||
maxWaiting := 1
|
||
loadRateSum := 0.0
|
||
loadRateSumSquares := 0.0
|
||
minTTFT, maxTTFT := 0.0, 0.0
|
||
hasTTFTSample := false
|
||
candidates := make([]openAIAccountCandidateScore, 0, len(filtered))
|
||
for _, account := range filtered {
|
||
loadInfo := loadMap[account.ID]
|
||
if loadInfo == nil {
|
||
loadInfo = &AccountLoadInfo{AccountID: account.ID}
|
||
}
|
||
if account.Priority < minPriority {
|
||
minPriority = account.Priority
|
||
}
|
||
if account.Priority > maxPriority {
|
||
maxPriority = account.Priority
|
||
}
|
||
if loadInfo.WaitingCount > maxWaiting {
|
||
maxWaiting = loadInfo.WaitingCount
|
||
}
|
||
errorRate, ttft, hasTTFT := s.stats.snapshot(account.ID)
|
||
if hasTTFT && ttft > 0 {
|
||
if !hasTTFTSample {
|
||
minTTFT, maxTTFT = ttft, ttft
|
||
hasTTFTSample = true
|
||
} else {
|
||
if ttft < minTTFT {
|
||
minTTFT = ttft
|
||
}
|
||
if ttft > maxTTFT {
|
||
maxTTFT = ttft
|
||
}
|
||
}
|
||
}
|
||
loadRate := float64(loadInfo.LoadRate)
|
||
loadRateSum += loadRate
|
||
loadRateSumSquares += loadRate * loadRate
|
||
candidates = append(candidates, openAIAccountCandidateScore{
|
||
account: account,
|
||
loadInfo: loadInfo,
|
||
errorRate: errorRate,
|
||
ttft: ttft,
|
||
hasTTFT: hasTTFT,
|
||
})
|
||
}
|
||
loadSkew := calcLoadSkewByMoments(loadRateSum, loadRateSumSquares, len(candidates))
|
||
|
||
weights := s.service.openAIWSSchedulerWeights()
|
||
for i := range candidates {
|
||
item := &candidates[i]
|
||
priorityFactor := 1.0
|
||
if maxPriority > minPriority {
|
||
priorityFactor = 1 - float64(item.account.Priority-minPriority)/float64(maxPriority-minPriority)
|
||
}
|
||
loadFactor := 1 - clamp01(float64(item.loadInfo.LoadRate)/100.0)
|
||
queueFactor := 1 - clamp01(float64(item.loadInfo.WaitingCount)/float64(maxWaiting))
|
||
errorFactor := 1 - clamp01(item.errorRate)
|
||
ttftFactor := 0.5
|
||
if item.hasTTFT && hasTTFTSample && maxTTFT > minTTFT {
|
||
ttftFactor = 1 - clamp01((item.ttft-minTTFT)/(maxTTFT-minTTFT))
|
||
}
|
||
|
||
item.score = weights.Priority*priorityFactor +
|
||
weights.Load*loadFactor +
|
||
weights.Queue*queueFactor +
|
||
weights.ErrorRate*errorFactor +
|
||
weights.TTFT*ttftFactor
|
||
}
|
||
|
||
topK := s.service.openAIWSLBTopK()
|
||
if topK > len(candidates) {
|
||
topK = len(candidates)
|
||
}
|
||
if topK <= 0 {
|
||
topK = 1
|
||
}
|
||
rankedCandidates := selectTopKOpenAICandidates(candidates, topK)
|
||
selectionOrder := buildOpenAIWeightedSelectionOrder(rankedCandidates, req)
|
||
|
||
for i := 0; i < len(selectionOrder); i++ {
|
||
candidate := selectionOrder[i]
|
||
result, acquireErr := s.service.tryAcquireAccountSlot(ctx, candidate.account.ID, candidate.account.Concurrency)
|
||
if acquireErr != nil {
|
||
return nil, len(candidates), topK, loadSkew, acquireErr
|
||
}
|
||
if result != nil && result.Acquired {
|
||
if req.SessionHash != "" {
|
||
_ = s.service.BindStickySession(ctx, req.GroupID, req.SessionHash, candidate.account.ID)
|
||
}
|
||
return &AccountSelectionResult{
|
||
Account: candidate.account,
|
||
Acquired: true,
|
||
ReleaseFunc: result.ReleaseFunc,
|
||
}, len(candidates), topK, loadSkew, nil
|
||
}
|
||
}
|
||
|
||
cfg := s.service.schedulingConfig()
|
||
// WaitPlan.MaxConcurrency 使用 Concurrency（非 EffectiveLoadFactor），因为 WaitPlan 控制的是 Redis 实际并发槽位等待。
|
||
candidate := selectionOrder[0]
|
||
return &AccountSelectionResult{
|
||
Account: candidate.account,
|
||
WaitPlan: &AccountWaitPlan{
|
||
AccountID: candidate.account.ID,
|
||
MaxConcurrency: candidate.account.Concurrency,
|
||
Timeout: cfg.FallbackWaitTimeout,
|
||
MaxWaiting: cfg.FallbackMaxWaiting,
|
||
},
|
||
}, len(candidates), topK, loadSkew, nil
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) isAccountTransportCompatible(account *Account, requiredTransport OpenAIUpstreamTransport) bool {
|
||
// HTTP 入站可回退到 HTTP 线路，不需要在账号选择阶段做传输协议强过滤。
|
||
if requiredTransport == OpenAIUpstreamTransportAny || requiredTransport == OpenAIUpstreamTransportHTTPSSE {
|
||
return true
|
||
}
|
||
if s == nil || s.service == nil || account == nil {
|
||
return false
|
||
}
|
||
return s.service.getOpenAIWSProtocolResolver().Resolve(account).Transport == requiredTransport
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) ReportResult(accountID int64, success bool, firstTokenMs *int) {
|
||
if s == nil || s.stats == nil {
|
||
return
|
||
}
|
||
s.stats.report(accountID, success, firstTokenMs)
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) ReportSwitch() {
|
||
if s == nil {
|
||
return
|
||
}
|
||
s.metrics.recordSwitch()
|
||
}
|
||
|
||
func (s *defaultOpenAIAccountScheduler) SnapshotMetrics() OpenAIAccountSchedulerMetricsSnapshot {
|
||
if s == nil {
|
||
return OpenAIAccountSchedulerMetricsSnapshot{}
|
||
}
|
||
|
||
selectTotal := s.metrics.selectTotal.Load()
|
||
prevHit := s.metrics.stickyPreviousHitTotal.Load()
|
||
sessionHit := s.metrics.stickySessionHitTotal.Load()
|
||
switchTotal := s.metrics.accountSwitchTotal.Load()
|
||
latencyTotal := s.metrics.latencyMsTotal.Load()
|
||
loadSkewTotal := s.metrics.loadSkewMilliTotal.Load()
|
||
|
||
snapshot := OpenAIAccountSchedulerMetricsSnapshot{
|
||
SelectTotal: selectTotal,
|
||
StickyPreviousHitTotal: prevHit,
|
||
StickySessionHitTotal: sessionHit,
|
||
LoadBalanceSelectTotal: s.metrics.loadBalanceSelectTotal.Load(),
|
||
AccountSwitchTotal: switchTotal,
|
||
SchedulerLatencyMsTotal: latencyTotal,
|
||
RuntimeStatsAccountCount: s.stats.size(),
|
||
}
|
||
if selectTotal > 0 {
|
||
snapshot.SchedulerLatencyMsAvg = float64(latencyTotal) / float64(selectTotal)
|
||
snapshot.StickyHitRatio = float64(prevHit+sessionHit) / float64(selectTotal)
|
||
snapshot.AccountSwitchRate = float64(switchTotal) / float64(selectTotal)
|
||
snapshot.LoadSkewAvg = float64(loadSkewTotal) / 1000 / float64(selectTotal)
|
||
}
|
||
return snapshot
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) getOpenAIAccountScheduler() OpenAIAccountScheduler {
|
||
if s == nil {
|
||
return nil
|
||
}
|
||
s.openaiSchedulerOnce.Do(func() {
|
||
if s.openaiAccountStats == nil {
|
||
s.openaiAccountStats = newOpenAIAccountRuntimeStats()
|
||
}
|
||
if s.openaiScheduler == nil {
|
||
s.openaiScheduler = newDefaultOpenAIAccountScheduler(s, s.openaiAccountStats)
|
||
}
|
||
})
|
||
return s.openaiScheduler
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) SelectAccountWithScheduler(
|
||
ctx context.Context,
|
||
groupID *int64,
|
||
previousResponseID string,
|
||
sessionHash string,
|
||
requestedModel string,
|
||
excludedIDs map[int64]struct{},
|
||
requiredTransport OpenAIUpstreamTransport,
|
||
) (*AccountSelectionResult, OpenAIAccountScheduleDecision, error) {
|
||
decision := OpenAIAccountScheduleDecision{}
|
||
scheduler := s.getOpenAIAccountScheduler()
|
||
if scheduler == nil {
|
||
selection, err := s.SelectAccountWithLoadAwareness(ctx, groupID, sessionHash, requestedModel, excludedIDs)
|
||
decision.Layer = openAIAccountScheduleLayerLoadBalance
|
||
return selection, decision, err
|
||
}
|
||
|
||
var stickyAccountID int64
|
||
if sessionHash != "" && s.cache != nil {
|
||
if accountID, err := s.getStickySessionAccountID(ctx, groupID, sessionHash); err == nil && accountID > 0 {
|
||
stickyAccountID = accountID
|
||
}
|
||
}
|
||
|
||
return scheduler.Select(ctx, OpenAIAccountScheduleRequest{
|
||
GroupID: groupID,
|
||
SessionHash: sessionHash,
|
||
StickyAccountID: stickyAccountID,
|
||
PreviousResponseID: previousResponseID,
|
||
RequestedModel: requestedModel,
|
||
RequiredTransport: requiredTransport,
|
||
ExcludedIDs: excludedIDs,
|
||
})
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) ReportOpenAIAccountScheduleResult(accountID int64, success bool, firstTokenMs *int) {
|
||
scheduler := s.getOpenAIAccountScheduler()
|
||
if scheduler == nil {
|
||
return
|
||
}
|
||
scheduler.ReportResult(accountID, success, firstTokenMs)
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) RecordOpenAIAccountSwitch() {
|
||
scheduler := s.getOpenAIAccountScheduler()
|
||
if scheduler == nil {
|
||
return
|
||
}
|
||
scheduler.ReportSwitch()
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) SnapshotOpenAIAccountSchedulerMetrics() OpenAIAccountSchedulerMetricsSnapshot {
|
||
scheduler := s.getOpenAIAccountScheduler()
|
||
if scheduler == nil {
|
||
return OpenAIAccountSchedulerMetricsSnapshot{}
|
||
}
|
||
return scheduler.SnapshotMetrics()
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) openAIWSSessionStickyTTL() time.Duration {
|
||
if s != nil && s.cfg != nil && s.cfg.Gateway.OpenAIWS.StickySessionTTLSeconds > 0 {
|
||
return time.Duration(s.cfg.Gateway.OpenAIWS.StickySessionTTLSeconds) * time.Second
|
||
}
|
||
return openaiStickySessionTTL
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) openAIWSLBTopK() int {
|
||
if s != nil && s.cfg != nil && s.cfg.Gateway.OpenAIWS.LBTopK > 0 {
|
||
return s.cfg.Gateway.OpenAIWS.LBTopK
|
||
}
|
||
return 7
|
||
}
|
||
|
||
func (s *OpenAIGatewayService) openAIWSSchedulerWeights() GatewayOpenAIWSSchedulerScoreWeightsView {
|
||
if s != nil && s.cfg != nil {
|
||
return GatewayOpenAIWSSchedulerScoreWeightsView{
|
||
Priority: s.cfg.Gateway.OpenAIWS.SchedulerScoreWeights.Priority,
|
||
Load: s.cfg.Gateway.OpenAIWS.SchedulerScoreWeights.Load,
|
||
Queue: s.cfg.Gateway.OpenAIWS.SchedulerScoreWeights.Queue,
|
||
ErrorRate: s.cfg.Gateway.OpenAIWS.SchedulerScoreWeights.ErrorRate,
|
||
TTFT: s.cfg.Gateway.OpenAIWS.SchedulerScoreWeights.TTFT,
|
||
}
|
||
}
|
||
return GatewayOpenAIWSSchedulerScoreWeightsView{
|
||
Priority: 1.0,
|
||
Load: 1.0,
|
||
Queue: 0.7,
|
||
ErrorRate: 0.8,
|
||
TTFT: 0.5,
|
||
}
|
||
}
|
||
|
||
type GatewayOpenAIWSSchedulerScoreWeightsView struct {
|
||
Priority float64
|
||
Load float64
|
||
Queue float64
|
||
ErrorRate float64
|
||
TTFT float64
|
||
}
|
||
|
||
func clamp01(value float64) float64 {
|
||
switch {
|
||
case value < 0:
|
||
return 0
|
||
case value > 1:
|
||
return 1
|
||
default:
|
||
return value
|
||
}
|
||
}
|
||
|
||
func calcLoadSkewByMoments(sum float64, sumSquares float64, count int) float64 {
|
||
if count <= 1 {
|
||
return 0
|
||
}
|
||
mean := sum / float64(count)
|
||
variance := sumSquares/float64(count) - mean*mean
|
||
if variance < 0 {
|
||
variance = 0
|
||
}
|
||
return math.Sqrt(variance)
|
||
}
|