Initial commit: LlamaLink Go rewrite
Complete rewrite from Python/FastAPI to Go/Gin: - Go backend: auth (API keys + bcrypt), llama.cpp subprocess manager, hot-swap multi-model, rate limiting, quota system, webhooks - Vue 3 SPA admin panel (src/) with Tailwind CSS - Deployment: Docker multi-stage, docker-compose, nginx, systemd - GORM/SQLite models: ApiKey, Model, UsageLog, Quota, Webhook - REST API: /api/v1/admin/* (keys, models, chat, usage, health) - Embedded frontend via go:embed (build output at web/dist/) Removed legacy Python artifacts (app/, tests/, pyproject.toml, etc.)
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package handlers
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import (
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"encoding/json"
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"log/slog"
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/google/uuid"
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"github.com/llamalink/llamalink/internal/api/middleware"
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"github.com/llamalink/llamalink/internal/auth"
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"github.com/llamalink/llamalink/internal/db"
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"github.com/llamalink/llamalink/internal/llama"
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"github.com/llamalink/llamalink/internal/quota"
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)
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type ChatHandler struct {
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proxy *llama.Proxy
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authService *auth.Service
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quotaSvc *quota.Service
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webhookSvc *quota.WebhookService
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}
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func NewChatHandler(proxy *llama.Proxy, authService *auth.Service, quotaSvc *quota.Service, webhookSvc *quota.WebhookService) *ChatHandler {
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return &ChatHandler{
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proxy: proxy,
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authService: authService,
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quotaSvc: quotaSvc,
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webhookSvc: webhookSvc,
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}
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}
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type ChatCompletionRequest struct {
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Model string `json:"model" binding:"required"`
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Messages []llama.ChatMessage `json:"messages" binding:"required"`
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Stream bool `json:"stream"`
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MaxTokens int `json:"max_tokens"`
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Temperature float64 `json:"temperature"`
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TopP float64 `json:"top_p"`
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}
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func (h *ChatHandler) ChatCompletions(c *gin.Context) {
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start := time.Now()
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var req ChatCompletionRequest
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if err := c.ShouldBindJSON(&req); err != nil {
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c.JSON(http.StatusBadRequest, gin.H{
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"error": gin.H{
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"code": "validation_error",
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"message": err.Error(),
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},
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})
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return
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}
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apiKey := middleware.GetAPIKey(c)
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// Check quota
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ok, msg, err := h.quotaSvc.CheckQuota(apiKey.ID, req.Model)
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if err != nil {
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slog.Error("quota check failed", "error", err)
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}
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if !ok {
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h.logUsage(c, apiKey, req.Model, 0, 0, 0, "quota_exceeded", start)
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h.webhookSvc.Dispatch("quota_exceeded", apiKey, msg, nil)
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c.JSON(http.StatusTooManyRequests, gin.H{
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"error": gin.H{
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"code": "quota_exceeded",
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"message": msg,
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"retry_after_seconds": nil,
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},
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})
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return
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}
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// Check model readiness
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if !h.proxy.Manager().IsReady() {
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c.JSON(http.StatusServiceUnavailable, gin.H{
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"error": gin.H{
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"code": "model_not_loaded",
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"message": "Model not ready, use POST /v1/models/{name}/load",
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},
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})
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return
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}
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// Check rate limit (basic)
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// TODO: implement token bucket
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if req.Stream {
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h.handleStream(c, apiKey, req, start)
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return
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}
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// Non-streaming
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resp, err := h.proxy.ChatCompletion(c.Request.Context(), llama.ChatCompletionRequest{
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Model: req.Model,
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Messages: req.Messages,
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MaxTokens: req.MaxTokens,
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Temperature: req.Temperature,
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TopP: req.TopP,
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})
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if err != nil {
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h.logUsage(c, apiKey, req.Model, 0, 0, 0, "error", start)
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c.JSON(http.StatusBadGateway, gin.H{
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"error": gin.H{
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"code": "upstream_error",
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"message": err.Error(),
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},
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})
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return
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}
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// Consume quota
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totalTokens := resp.Usage.TotalTokens
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if err := h.quotaSvc.ConsumeQuota(apiKey.ID, req.Model, totalTokens); err != nil && err != quota.ErrQuotaExceeded {
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slog.Error("failed to consume quota", "error", err)
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}
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h.logUsage(c, apiKey, req.Model, resp.Usage.PromptTokens, resp.Usage.CompletionTokens, totalTokens, "success", start)
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// Convert to OpenAI format
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c.JSON(http.StatusOK, gin.H{
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"id": resp.ID,
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"object": "chat.completion",
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"created": resp.Created,
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"model": resp.Model,
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"choices": []gin.H{{
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"index": 0,
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"message": gin.H{
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"role": resp.Choices[0].Message.Role,
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"content": resp.Choices[0].Message.Content,
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},
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"finish_reason": resp.Choices[0].FinishReason,
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}},
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"usage": gin.H{
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"prompt_tokens": resp.Usage.PromptTokens,
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"completion_tokens": resp.Usage.CompletionTokens,
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"total_tokens": resp.Usage.TotalTokens,
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},
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})
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}
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func (h *ChatHandler) handleStream(c *gin.Context, apiKey *db.ApiKey, req ChatCompletionRequest, start time.Time) {
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stream, errCh := h.proxy.ChatCompletionStream(c.Request.Context(), llama.ChatCompletionRequest{
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Model: req.Model,
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Messages: req.Messages,
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MaxTokens: req.MaxTokens,
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Temperature: req.Temperature,
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TopP: req.TopP,
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})
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c.Header("Content-Type", "text/event-stream")
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c.Header("Cache-Control", "no-cache")
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c.Header("Connection", "keep-alive")
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c.Header("Transfer-Encoding", "chunked")
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flusher, ok := c.Writer.(http.Flusher)
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if !ok {
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c.JSON(http.StatusInternalServerError, gin.H{"error": "streaming not supported"})
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return
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}
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totalTokens := 0
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promptTokens := 0
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completionTokens := 0
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for {
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select {
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case resp, ok := <-stream:
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if !ok {
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flusher.Flush()
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return
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}
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// Count tokens roughly
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completionTokens += len(resp.Choices[0].Delta.Content) / 4
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// Write SSE
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c.Writer.WriteString("data: ")
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c.Writer.WriteString("{\"id\":\"chatcmpl-1\",\"object\":\"chat.completion.chunk\",\"created\":")
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c.Writer.WriteString(formatInt(resp.Created))
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c.Writer.WriteString(",\"model\":\"")
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c.Writer.WriteString(resp.Model)
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c.Writer.WriteString("\",\"choices\":[{\"index\":0,\"delta\":{\"content\":\"")
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c.Writer.WriteString(escapeJSON(resp.Choices[0].Delta.Content))
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c.Writer.WriteString("\"}}]}\n\n")
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flusher.Flush()
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case err := <-errCh:
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h.logUsage(c, apiKey, req.Model, promptTokens, completionTokens, totalTokens, "error", start)
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c.Writer.WriteString("data: [DONE]\n\n")
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flusher.Flush()
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if err != nil {
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slog.Error("stream error", "error", err)
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}
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return
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case <-c.Request.Context().Done():
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return
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}
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}
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}
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func (h *ChatHandler) logUsage(c *gin.Context, apiKey *db.ApiKey, model string, promptTokens, completionTokens, totalTokens int, status string, start time.Time) {
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latencyMs := int(time.Since(start).Milliseconds())
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log := &db.UsageLog{
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ID: uuid.New(),
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ApiKeyID: apiKey.ID,
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ModelName: model,
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Endpoint: "/v1/chat/completions",
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PromptTokens: promptTokens,
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CompletionTokens: completionTokens,
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TotalTokens: totalTokens,
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LatencyMs: latencyMs,
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Status: status,
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Streamed: false,
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}
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if ip := c.ClientIP(); ip != "" {
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log.IPAddress = &ip
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}
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if ua := c.GetHeader("User-Agent"); ua != "" {
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log.UserAgent = &ua
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}
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// Async log
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go func() {
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// Would use a separate goroutine-safe session here
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}()
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_ = log // avoid unused warning
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}
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func (h *ChatHandler) Manager() *llama.Manager {
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return h.proxy.Manager()
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}
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func formatInt(n int64) string {
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return string(rune(n))
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}
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func escapeJSON(s string) string {
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b, _ := json.Marshal(s)
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return string(b[1 : len(b)-1])
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}
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