Add request params to request context

Author: aengelberg

ldmiddleware/http_middleware.go

@@ -9,14 +9,29 @@ import (
 )
 
 // AddRequestScopedClient returns a net/http middleware that, for each incoming request,
-// creates an LDScopedClient seeded with a `request`-kind LDContext and stores it in the
+// creates an LDScopedClient seeded with a `request`-kind LDContext populated with useful
+// HTTP request attributes (e.g., method, path, host, userAgent), and stores it in the
 // request's Go context. Downstream handlers can retrieve it via ld.GetScopedClient.
 func AddRequestScopedClient(client *ld.LDClient) func(next http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			// Use a UUID to identify the request context key.
 			requestKey := uuid.New().String()
-			requestCtx := ldcontext.NewWithKind("request", requestKey)
+			b := ldcontext.NewBuilder(requestKey).Kind("request").Anonymous(true)
+			b.SetString("method", r.Method)
+			b.SetString("host", r.Host)
+			b.SetString("userAgent", r.UserAgent())
+			if r.URL != nil {
+				b.SetString("path", r.URL.Path)
+				b.SetString("scheme", r.URL.Scheme)
+				b.SetString("query", r.URL.RawQuery)
+			}
+			b.SetString("proto", r.Proto)
+			b.SetString("remoteAddr", r.RemoteAddr)
+			if rid := r.Header.Get("X-Request-Id"); rid != "" {
+				b.SetString("requestId", rid)
+			}
+			requestCtx := b.Build()
 
 			scoped := ld.NewScopedClient(client, requestCtx)
 			ctxWithScoped := ld.GoContextWithScopedClient(r.Context(), scoped)