feat: 前端搭建-未完成
This commit is contained in:
tbphp
@@ -2,498 +2,118 @@
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package proxy
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"gpt-load/internal/channel"
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"gpt-load/internal/models"
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"gpt-load/internal/response"
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"net/http"
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"net/url"
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"strings"
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"sync/atomic"
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"sync"
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"time"
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"gpt-load/internal/errors"
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"gpt-load/internal/types"
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"github.com/gin-gonic/gin"
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"github.com/sirupsen/logrus"
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"gorm.io/gorm"
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)
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// A list of errors that are considered normal during streaming when a client disconnects.
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var ignorableStreamErrors = []string{
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"context canceled",
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"connection reset by peer",
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"broken pipe",
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"use of closed network connection",
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}
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// isIgnorableStreamError checks if the error is a common, non-critical error that can occur
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// when a client disconnects during a streaming response.
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func isIgnorableStreamError(err error) bool {
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errStr := err.Error()
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for _, ignorableError := range ignorableStreamErrors {
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if strings.Contains(errStr, ignorableError) {
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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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// ProxyServer represents the proxy server
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type ProxyServer struct {
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keyManager types.KeyManager
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configManager types.ConfigManager
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httpClient *http.Client
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streamClient *http.Client // Dedicated client for streaming
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requestCount int64
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startTime time.Time
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DB *gorm.DB
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groupCounters sync.Map // For round-robin key selection
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requestLogChan chan models.RequestLog
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}
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// NewProxyServer creates a new proxy server
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func NewProxyServer(keyManager types.KeyManager, configManager types.ConfigManager) (*ProxyServer, error) {
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openaiConfig := configManager.GetOpenAIConfig()
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perfConfig := configManager.GetPerformanceConfig()
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// Create high-performance HTTP client
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transport := &http.Transport{
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MaxIdleConns: 100,
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MaxIdleConnsPerHost: 20,
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MaxConnsPerHost: 0,
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IdleConnTimeout: time.Duration(openaiConfig.IdleConnTimeout) * time.Second,
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TLSHandshakeTimeout: 15 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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DisableCompression: !perfConfig.EnableGzip,
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ForceAttemptHTTP2: true,
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WriteBufferSize: 32 * 1024,
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ReadBufferSize: 32 * 1024,
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}
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// Create dedicated transport for streaming, optimize TCP parameters
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streamTransport := &http.Transport{
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MaxIdleConns: 200,
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MaxIdleConnsPerHost: 40,
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MaxConnsPerHost: 0,
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IdleConnTimeout: time.Duration(openaiConfig.IdleConnTimeout) * time.Second,
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TLSHandshakeTimeout: 15 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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DisableCompression: true,
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ForceAttemptHTTP2: true,
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WriteBufferSize: 0,
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ReadBufferSize: 0,
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ResponseHeaderTimeout: time.Duration(openaiConfig.ResponseTimeout) * time.Second,
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}
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httpClient := &http.Client{
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Transport: transport,
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Timeout: time.Duration(openaiConfig.RequestTimeout) * time.Second,
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}
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// Streaming client without overall timeout
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streamClient := &http.Client{
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Transport: streamTransport,
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}
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func NewProxyServer(db *gorm.DB, requestLogChan chan models.RequestLog) (*ProxyServer, error) {
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return &ProxyServer{
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keyManager: keyManager,
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configManager: configManager,
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httpClient: httpClient,
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streamClient: streamClient,
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startTime: time.Now(),
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DB: db,
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groupCounters: sync.Map{},
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requestLogChan: requestLogChan,
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}, nil
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}
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// HandleProxy handles proxy requests
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// RegisterProxyRoutes registers the main proxy route under a given router group
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func (ps *ProxyServer) RegisterProxyRoutes(proxy *gin.RouterGroup) {
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proxy.Any("/:group_name/*path", ps.HandleProxy)
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}
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// HandleProxy handles the main proxy logic
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func (ps *ProxyServer) HandleProxy(c *gin.Context) {
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startTime := time.Now()
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groupName := c.Param("group_name")
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// Increment request count
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atomic.AddInt64(&ps.requestCount, 1)
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// Cache all request body upfront
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var bodyBytes []byte
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if c.Request.Body != nil {
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var err error
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bodyBytes, err = io.ReadAll(c.Request.Body)
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if err != nil {
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logrus.Errorf("Failed to read request body: %v", err)
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c.JSON(http.StatusBadRequest, gin.H{
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"error": "Failed to read request body",
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"code": errors.ErrProxyRequest,
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})
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return
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}
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}
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// Determine if this is a streaming request using cached data
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isStreamRequest := ps.isStreamRequest(bodyBytes, c)
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// Execute request with retry
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ps.executeRequestWithRetry(c, startTime, bodyBytes, isStreamRequest, 0, nil)
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}
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// isStreamRequest determines if this is a streaming request
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func (ps *ProxyServer) isStreamRequest(bodyBytes []byte, c *gin.Context) bool {
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// Check for Gemini streaming endpoint
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if strings.HasSuffix(c.Request.URL.Path, ":streamGenerateContent") {
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return true
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}
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// Check Accept header
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if strings.Contains(c.GetHeader("Accept"), "text/event-stream") {
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return true
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}
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// Check URL query parameter
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if c.Query("stream") == "true" {
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return true
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}
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// Check stream parameter in request body
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if len(bodyBytes) > 0 {
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var bodyJSON map[string]interface{}
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if err := json.Unmarshal(bodyBytes, &bodyJSON); err == nil {
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if stream, ok := bodyJSON["stream"].(bool); ok && stream {
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return true
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}
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}
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}
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return false
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}
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// executeRequestWithRetry executes request with retry logic
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func (ps *ProxyServer) executeRequestWithRetry(c *gin.Context, startTime time.Time, bodyBytes []byte, isStreamRequest bool, retryCount int, retryErrors []types.RetryError) {
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keysConfig := ps.configManager.GetKeysConfig()
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if retryCount > keysConfig.MaxRetries {
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logrus.Debugf("Max retries exceeded (%d)", retryCount-1)
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errorResponse := gin.H{
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"error": "Max retries exceeded",
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"code": errors.ErrProxyRetryExhausted,
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"retry_count": retryCount - 1,
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"retry_errors": retryErrors,
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"timestamp": time.Now().UTC().Format(time.RFC3339),
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}
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statusCode := http.StatusBadGateway
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if len(retryErrors) > 0 && retryErrors[len(retryErrors)-1].StatusCode > 0 {
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statusCode = retryErrors[len(retryErrors)-1].StatusCode
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}
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c.JSON(statusCode, errorResponse)
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// 1. Find the group by name
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var group models.Group
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if err := ps.DB.Preload("APIKeys").Where("name = ?", groupName).First(&group).Error; err != nil {
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response.Error(c, http.StatusNotFound, fmt.Sprintf("Group '%s' not found", groupName))
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return
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}
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// Get key information
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keyInfo, err := ps.keyManager.GetNextKey()
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// 2. Select an available API key from the group
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apiKey, err := ps.selectAPIKey(&group)
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if err != nil {
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logrus.Errorf("Failed to get key: %v", err)
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c.JSON(http.StatusServiceUnavailable, gin.H{
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"error": "No API keys available",
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"code": errors.ErrNoKeysAvailable,
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})
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response.Error(c, http.StatusServiceUnavailable, err.Error())
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return
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}
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// Set key information to context (for logging)
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c.Set("keyIndex", keyInfo.Index)
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c.Set("keyPreview", keyInfo.Preview)
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// Set retry information to context
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if retryCount > 0 {
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c.Set("retryCount", retryCount)
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}
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// Get a base URL from the config manager (handles round-robin)
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openaiConfig := ps.configManager.GetOpenAIConfig()
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upstreamURL, err := url.Parse(openaiConfig.BaseURL)
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// 3. Get the appropriate channel handler from the factory
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channelHandler, err := channel.GetChannel(&group)
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if err != nil {
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logrus.Errorf("Failed to parse upstream URL: %v", err)
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c.JSON(http.StatusInternalServerError, gin.H{
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"error": "Invalid upstream URL configured",
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"code": errors.ErrConfigInvalid,
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})
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response.Error(c, http.StatusInternalServerError, fmt.Sprintf("Failed to get channel for group '%s': %v", groupName, err))
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return
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}
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// Build upstream request URL
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targetURL := *upstreamURL
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// Correctly append path instead of replacing it
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if strings.HasSuffix(targetURL.Path, "/") {
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targetURL.Path = targetURL.Path + strings.TrimPrefix(c.Request.URL.Path, "/")
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} else {
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targetURL.Path = targetURL.Path + c.Request.URL.Path
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}
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targetURL.RawQuery = c.Request.URL.RawQuery
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// 4. Forward the request using the channel handler
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channelHandler.Handle(c, apiKey, &group)
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// Use different timeout strategies for streaming and non-streaming requests
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var ctx context.Context
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var cancel context.CancelFunc
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// 5. Log the request asynchronously
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go ps.logRequest(c, &group, apiKey, startTime)
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}
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if isStreamRequest {
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// Streaming requests only set response header timeout, no overall timeout
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ctx, cancel = context.WithCancel(c.Request.Context())
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} else {
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// Non-streaming requests use configured timeout from the already fetched config
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timeout := time.Duration(openaiConfig.RequestTimeout) * time.Second
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ctx, cancel = context.WithTimeout(c.Request.Context(), timeout)
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}
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defer cancel()
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// Create request using cached bodyBytes
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req, err := http.NewRequestWithContext(
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ctx,
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c.Request.Method,
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targetURL.String(),
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bytes.NewReader(bodyBytes),
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)
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if err != nil {
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logrus.Errorf("Failed to create upstream request: %v", err)
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c.JSON(http.StatusInternalServerError, gin.H{
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"error": "Failed to create upstream request",
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"code": errors.ErrProxyRequest,
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})
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return
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}
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req.ContentLength = int64(len(bodyBytes))
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// Copy request headers
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for key, values := range c.Request.Header {
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if key != "Host" {
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for _, value := range values {
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req.Header.Add(key, value)
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}
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// selectAPIKey selects an API key from a group using round-robin
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func (ps *ProxyServer) selectAPIKey(group *models.Group) (*models.APIKey, error) {
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activeKeys := make([]models.APIKey, 0, len(group.APIKeys))
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for _, key := range group.APIKeys {
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if key.Status == "active" {
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activeKeys = append(activeKeys, key)
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}
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}
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if c.GetHeader("Authorization") != "" {
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req.Header.Set("Authorization", "Bearer "+keyInfo.Key)
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req.Header.Del("X-Goog-Api-Key")
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} else if c.GetHeader("X-Goog-Api-Key") != "" {
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req.Header.Set("X-Goog-Api-Key", keyInfo.Key)
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req.Header.Del("Authorization")
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} else if c.Query("key") != "" {
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q := req.URL.Query()
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q.Set("key", keyInfo.Key)
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req.URL.RawQuery = q.Encode()
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} else {
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c.JSON(http.StatusUnauthorized, gin.H{
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"error": "API key required. Please provide a key in 'Authorization' or 'X-Goog-Api-Key' header.",
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"code": errors.ErrAuthMissing,
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})
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c.Abort()
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return
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if len(activeKeys) == 0 {
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return nil, fmt.Errorf("no active API keys available in group '%s'", group.Name)
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}
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// Choose appropriate client based on request type
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var client *http.Client
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if isStreamRequest {
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client = ps.streamClient
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// Add header to disable nginx buffering
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req.Header.Set("X-Accel-Buffering", "no")
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} else {
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client = ps.httpClient
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// Get the current counter for the group
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counter, _ := ps.groupCounters.LoadOrStore(group.ID, uint64(0))
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currentCounter := counter.(uint64)
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// Select the key and increment the counter
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selectedKey := activeKeys[int(currentCounter%uint64(len(activeKeys)))]
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ps.groupCounters.Store(group.ID, currentCounter+1)
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return &selectedKey, nil
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}
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func (ps *ProxyServer) logRequest(c *gin.Context, group *models.Group, key *models.APIKey, startTime time.Time) {
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logEntry := models.RequestLog{
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ID: fmt.Sprintf("req_%d", time.Now().UnixNano()),
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Timestamp: startTime,
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GroupID: group.ID,
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KeyID: key.ID,
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SourceIP: c.ClientIP(),
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StatusCode: c.Writer.Status(),
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RequestPath: c.Request.URL.Path,
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RequestBodySnippet: "", // Can be implemented later if needed
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}
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// Send request
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resp, err := client.Do(req)
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if err != nil {
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responseTime := time.Since(startTime)
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// Log failure
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if retryCount > 0 {
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logrus.Warnf("Retry request failed (attempt %d): %v (response time: %v)", retryCount+1, err, responseTime)
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} else {
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logrus.Warnf("Initial request failed: %v (response time: %v)", err, responseTime)
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}
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// Record failure asynchronously
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go ps.keyManager.RecordFailure(keyInfo.Key, err)
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// Record retry error information
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if retryErrors == nil {
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retryErrors = make([]types.RetryError, 0)
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}
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retryErrors = append(retryErrors, types.RetryError{
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StatusCode: 0, // Network error, no HTTP status code
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ErrorMessage: err.Error(),
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KeyIndex: keyInfo.Index,
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Attempt: retryCount + 1,
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})
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// Retry
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ps.executeRequestWithRetry(c, startTime, bodyBytes, isStreamRequest, retryCount+1, retryErrors)
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return
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}
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defer resp.Body.Close()
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responseTime := time.Since(startTime)
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// Check if HTTP status code requires retry
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if resp.StatusCode >= 400 {
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// Log failure
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if retryCount > 0 {
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logrus.Debugf("Retry request returned error %d (attempt %d) (response time: %v)", resp.StatusCode, retryCount+1, responseTime)
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} else {
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logrus.Debugf("Initial request returned error %d (response time: %v)", resp.StatusCode, responseTime)
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}
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// Read response body to get error information
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var errorMessage string
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bodyBytes, err := io.ReadAll(resp.Body)
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if err != nil {
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errorMessage = fmt.Sprintf("HTTP %d (failed to read body: %v)", resp.StatusCode, err)
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} else {
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if resp.Header.Get("Content-Encoding") == "gzip" {
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reader, gErr := gzip.NewReader(bytes.NewReader(bodyBytes))
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if gErr != nil {
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errorMessage = fmt.Sprintf("gzip reader error: %v", gErr)
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} else {
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uncompressedBytes, rErr := io.ReadAll(reader)
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reader.Close()
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if rErr != nil {
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errorMessage = fmt.Sprintf("gzip read error: %v", rErr)
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} else {
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errorMessage = string(uncompressedBytes)
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}
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}
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} else {
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errorMessage = string(bodyBytes)
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}
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}
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var jsonError struct {
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Error struct {
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Message string `json:"message"`
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} `json:"error"`
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}
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if err := json.Unmarshal([]byte(errorMessage), &jsonError); err == nil && jsonError.Error.Message != "" {
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logrus.Warnf("Http Error: %s", jsonError.Error.Message)
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} else {
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logrus.Warnf("Http Error: %s", errorMessage)
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}
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// Record failure asynchronously
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go ps.keyManager.RecordFailure(keyInfo.Key, fmt.Errorf("HTTP %d", resp.StatusCode))
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// Record retry error information
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if retryErrors == nil {
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retryErrors = make([]types.RetryError, 0)
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}
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retryErrors = append(retryErrors, types.RetryError{
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StatusCode: resp.StatusCode,
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ErrorMessage: errorMessage,
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KeyIndex: keyInfo.Index,
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Attempt: retryCount + 1,
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})
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// Retry
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ps.executeRequestWithRetry(c, startTime, bodyBytes, isStreamRequest, retryCount+1, retryErrors)
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return
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}
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// Success - record success asynchronously
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go ps.keyManager.RecordSuccess(keyInfo.Key)
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// Log final success result
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if retryCount > 0 {
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logrus.Debugf("Request succeeded after %d retries (response time: %v)", retryCount, responseTime)
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} else {
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logrus.Debugf("Request succeeded on first attempt (response time: %v)", responseTime)
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}
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// Copy response headers
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for key, values := range resp.Header {
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for _, value := range values {
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c.Header(key, value)
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}
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}
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// Set status code
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c.Status(resp.StatusCode)
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// Handle streaming and non-streaming responses
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if isStreamRequest {
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ps.handleStreamingResponse(c, resp)
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} else {
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ps.handleNormalResponse(c, resp)
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// Send to the logging channel without blocking
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select {
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case ps.requestLogChan <- logEntry:
|
||||
default:
|
||||
logrus.Warn("Request log channel is full. Dropping log entry.")
|
||||
}
|
||||
}
|
||||
|
||||
var newline = []byte("\n")
|
||||
|
||||
// handleStreamingResponse handles streaming responses
|
||||
func (ps *ProxyServer) handleStreamingResponse(c *gin.Context, resp *http.Response) {
|
||||
// Set headers for streaming
|
||||
c.Header("Cache-Control", "no-cache")
|
||||
c.Header("Connection", "keep-alive")
|
||||
c.Header("Content-Type", "text/event-stream")
|
||||
c.Header("X-Accel-Buffering", "no")
|
||||
|
||||
flusher, ok := c.Writer.(http.Flusher)
|
||||
if !ok {
|
||||
logrus.Error("Streaming unsupported")
|
||||
c.JSON(http.StatusInternalServerError, gin.H{
|
||||
"error": "Streaming unsupported",
|
||||
"code": errors.ErrServerInternal,
|
||||
})
|
||||
return
|
||||
}
|
||||
|
||||
scanner := bufio.NewScanner(resp.Body)
|
||||
scanner.Buffer(make([]byte, 0, 64*1024), 1024*1024)
|
||||
|
||||
for scanner.Scan() {
|
||||
lineBytes := scanner.Bytes()
|
||||
if _, err := c.Writer.Write(lineBytes); err != nil {
|
||||
if isIgnorableStreamError(err) {
|
||||
logrus.Debugf("Stream closed by client: %v", err)
|
||||
} else {
|
||||
logrus.Errorf("Failed to write streaming data: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
if _, err := c.Writer.Write(newline); err != nil {
|
||||
if isIgnorableStreamError(err) {
|
||||
logrus.Debugf("Stream closed by client: %v", err)
|
||||
} else {
|
||||
logrus.Errorf("Failed to write streaming data: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
flusher.Flush()
|
||||
}
|
||||
|
||||
if err := scanner.Err(); err != nil {
|
||||
if isIgnorableStreamError(err) {
|
||||
logrus.Debugf("Stream closed by client or network: %v", err)
|
||||
} else {
|
||||
logrus.Errorf("Error reading streaming response: %v", err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// handleNormalResponse handles normal responses
|
||||
func (ps *ProxyServer) handleNormalResponse(c *gin.Context, resp *http.Response) {
|
||||
// Copy response body
|
||||
if _, err := io.Copy(c.Writer, resp.Body); err != nil {
|
||||
logrus.Errorf("Failed to copy response body: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// Close closes the proxy server and cleans up resources
|
||||
// Close cleans up resources
|
||||
func (ps *ProxyServer) Close() {
|
||||
// Close HTTP clients if needed
|
||||
if ps.httpClient != nil {
|
||||
ps.httpClient.CloseIdleConnections()
|
||||
}
|
||||
if ps.streamClient != nil {
|
||||
ps.streamClient.CloseIdleConnections()
|
||||
}
|
||||
// Nothing to close for now
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user