Build AI gateway control plane and admin UI

1 files changed, 65 insertions, 0 deletions

diff --git a/cmd/mockupstream/main.go b/cmd/mockupstream/main.go
new file mode 100644
index 0000000..cf695bb
--- /dev/null
+++ b/cmd/mockupstream/main.go
@@ -0,0 +1,65 @@
+// Command mockupstream is a local-only upstream used for manual gateway checks.
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+func main() {
+	address := flag.String("address", "127.0.0.1:18080", "listen address")
+	flag.Parse()
+	mux := http.NewServeMux()
+	mux.HandleFunc("POST /v1/chat/completions", openAI)
+	mux.HandleFunc("POST /v1/messages", anthropic)
+	server := &http.Server{Addr: *address, Handler: mux, ReadHeaderTimeout: 5 * time.Second}
+	log.Printf("mock upstream listening on http://%s", *address)
+	log.Fatal(server.ListenAndServe())
+}
+
+func openAI(w http.ResponseWriter, r *http.Request) {
+	var request struct {
+		Model  string `json:"model"`
+		Stream bool   `json:"stream"`
+	}
+	if json.NewDecoder(r.Body).Decode(&request) != nil {
+		http.Error(w, "invalid JSON", http.StatusBadRequest)
+		return
+	}
+	if request.Stream {
+		w.Header().Set("Content-Type", "text/event-stream")
+		w.Header().Set("Cache-Control", "no-cache")
+		fmt.Fprintf(w, "data: {\"id\":\"chatcmpl-local\",\"object\":\"chat.completion.chunk\",\"model\":%q,\"choices\":[{\"index\":0,\"delta\":{\"role\":\"assistant\",\"content\":\"hello from mock upstream\"},\"finish_reason\":null}]}\n\n", request.Model)
+		w.(http.Flusher).Flush()
+		time.Sleep(50 * time.Millisecond)
+		fmt.Fprint(w, "data: {\"id\":\"chatcmpl-local\",\"object\":\"chat.completion.chunk\",\"choices\":[],\"usage\":{\"prompt_tokens\":4,\"completion_tokens\":4,\"total_tokens\":8}}\n\ndata: [DONE]\n\n")
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	_ = json.NewEncoder(w).Encode(map[string]any{
+		"id": "chatcmpl-local", "object": "chat.completion", "model": request.Model,
+		"choices": []any{map[string]any{"index": 0, "message": map[string]string{"role": "assistant", "content": "hello from mock upstream"}, "finish_reason": "stop"}},
+		"usage":   map[string]int{"prompt_tokens": 4, "completion_tokens": 4, "total_tokens": 8},
+	})
+}
+
+func anthropic(w http.ResponseWriter, r *http.Request) {
+	var request struct {
+		Model string `json:"model"`
+	}
+	if json.NewDecoder(r.Body).Decode(&request) != nil {
+		http.Error(w, "invalid JSON", http.StatusBadRequest)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	_ = json.NewEncoder(w).Encode(map[string]any{
+		"id": "msg_local", "type": "message", "role": "assistant", "model": request.Model,
+		"content":     []any{map[string]string{"type": "text", "text": "hello from mock upstream"}},
+		"stop_reason": "end_turn", "stop_sequence": nil,
+		"usage": map[string]int{"input_tokens": 4, "output_tokens": 4},
+	})
+}