add config viewer

Signed-off-by: JaredforReal <[email protected]>

Author: JaredforReal

dashboard/backend/Dockerfile

@@ -11,10 +11,19 @@ RUN npm run build
 # Stage 2: Build backend with Go
 FROM golang:1.24 AS backend-builder
 WORKDIR /app
-COPY dashboard/backend/ /app/dashboard/backend/
+
+# Use Chinese Go proxy to avoid network timeout issues
+ENV GOPROXY=https://goproxy.cn,direct
+ENV GOSUMDB=sum.golang.google.cn
+
+# Copy go.mod and go.sum first for better caching
+COPY dashboard/backend/go.mod dashboard/backend/go.sum /app/dashboard/backend/
 WORKDIR /app/dashboard/backend
-RUN go mod download || true
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /app/dashboard-backend main.go
+RUN go mod download
+
+# Copy source code and build
+COPY dashboard/backend/ /app/dashboard/backend/
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /app/dashboard-backend main.go
 
 # Stage 3: Final runtime image
 FROM alpine:3.19

dashboard/backend/go.mod

@@ -1,3 +1,5 @@
 module github.com/vllm-project/semantic-router/dashboard/backend
 
 go 1.21
+
+require gopkg.in/yaml.v3 v3.0.1

dashboard/backend/go.sum

@@ -0,0 +1,4 @@
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

dashboard/backend/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
 	"log"
@@ -9,7 +10,10 @@ import (
 	"net/url"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
+
+	yaml "gopkg.in/yaml.v3"
 )
 
 // env returns the env var or default
@@ -20,6 +24,41 @@ func env(key, def string) string {
 	return def
 }
 
+// configHandler reads and serves the config.yaml file as JSON
+func configHandler(configPath string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		// Only allow GET requests
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+
+		// Read the config file
+		data, err := os.ReadFile(configPath)
+		if err != nil {
+			log.Printf("Error reading config file: %v", err)
+			http.Error(w, fmt.Sprintf("Failed to read config file: %v", err), http.StatusInternalServerError)
+			return
+		}
+
+		// Parse YAML
+		var config interface{}
+		if err := yaml.Unmarshal(data, &config); err != nil {
+			log.Printf("Error parsing config YAML: %v", err)
+			http.Error(w, fmt.Sprintf("Failed to parse config: %v", err), http.StatusInternalServerError)
+			return
+		}
+
+		// Convert to JSON and send response
+		w.Header().Set("Content-Type", "application/json")
+		if err := json.NewEncoder(w).Encode(config); err != nil {
+			log.Printf("Error encoding config to JSON: %v", err)
+			http.Error(w, fmt.Sprintf("Failed to encode config: %v", err), http.StatusInternalServerError)
+			return
+		}
+	}
+}
+
 // newReverseProxy creates a reverse proxy to targetBase and strips the given prefix from the incoming path
 func newReverseProxy(targetBase, stripPrefix string, forwardAuth bool) (*httputil.ReverseProxy, error) {
 	targetURL, err := url.Parse(targetBase)
@@ -143,6 +182,7 @@ func main() {
 	// Flags/env for configuration
 	port := flag.String("port", env("DASHBOARD_PORT", "8700"), "dashboard port")
 	staticDir := flag.String("static", env("DASHBOARD_STATIC_DIR", "../frontend"), "static assets directory")
+	configFile := flag.String("config", env("ROUTER_CONFIG_PATH", "../../config/config.yaml"), "path to config.yaml")
 
 	// Upstream targets
 	grafanaURL := flag.String("grafana", env("TARGET_GRAFANA_URL", ""), "Grafana base URL")
@@ -153,6 +193,13 @@ func main() {
 
 	flag.Parse()
 
+	// Resolve config file path to absolute path
+	absConfigPath, err := filepath.Abs(*configFile)
+	if err != nil {
+		log.Fatalf("Failed to resolve config path: %v", err)
+	}
+	log.Printf("Config file path: %s", absConfigPath)
+
 	mux := http.NewServeMux()
 
 	// Health check endpoint
@@ -162,6 +209,10 @@ func main() {
 		w.Write([]byte(`{"status":"healthy","service":"semantic-router-dashboard"}`))
 	})
 
+	// Config endpoint - serve the config.yaml as JSON
+	mux.HandleFunc("/api/router/config/all", configHandler(absConfigPath))
+	log.Printf("Config API endpoint registered: /api/router/config/all")
+
 	// Router API proxy (forward Authorization) - MUST be registered before Grafana
 	var routerAPIProxy *httputil.ReverseProxy
 	if *routerAPI != "" {