Add http.route tags for API Gateway (#584)

Author: nhulston

integration_tests/snapshots/logs/process-input-traced_node16.log

@@ -48,6 +48,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "200",
           "_dd.base_service": "integration-tests-js-XXXX-process-input-traced_node16",

integration_tests/snapshots/logs/process-input-traced_node18.log

@@ -48,6 +48,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "200",
           "_dd.base_service": "integration-tests-js-XXXX-process-input-traced_node18",

integration_tests/snapshots/logs/process-input-traced_node20.log

@@ -48,6 +48,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "200",
           "_dd.base_service": "integration-tests-js-XXXX-process-input-traced_node20",

integration_tests/snapshots/logs/status-code-500s_node16.log

@@ -54,6 +54,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "500",
           "_dd.base_service": "integration-tests-js-XXXX-status-code-500s_node16",

integration_tests/snapshots/logs/status-code-500s_node18.log

@@ -54,6 +54,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "500",
           "_dd.base_service": "integration-tests-js-XXXX-status-code-500s_node18",

integration_tests/snapshots/logs/status-code-500s_node20.log

@@ -54,6 +54,7 @@ START
           "_inferred_span.tag_source": "self",
           "_inferred_span.synchronicity": "sync",
           "http.method": "GET",
+          "http.route":"/{proxy+}",
           "stage": "test",
           "http.status_code": "500",
           "_dd.base_service": "integration-tests-js-XXXX-status-code-500s_node20",

src/trace/trigger.spec.ts

@@ -17,6 +17,7 @@ describe("parseEventSource", () => {
         "http.url": "id.execute-api.us-east-1.amazonaws.com",
         "http.url_details.path": "/my/path",
         "http.method": "GET",
+        "http.route": "/my/path",
       },
       file: "api-gateway-v1.json",
     },
@@ -27,6 +28,7 @@ describe("parseEventSource", () => {
         "http.url": "r3pmxmplak.execute-api.us-east-2.amazonaws.com",
         "http.url_details.path": "/default/nodejs-apig-function-1G3XMPLZXVXYI",
         "http.method": "GET",
+        "http.route": "/nodejs-apig-function-1G3XMPLZXVXYI",
       },
       file: "api-gateway-v2.json",
     },

src/trace/trigger.ts

@@ -275,6 +275,9 @@ function extractHTTPTags(event: APIGatewayEvent | APIGatewayProxyEventV2 | ALBEv
     if (event.headers?.Referer) {
       httpTags["http.referer"] = event.headers.Referer;
     }
+    if (event.resource) {
+      httpTags["http.route"] = event.resource;
+    }
     return httpTags;
   }
 
@@ -286,6 +289,11 @@ function extractHTTPTags(event: APIGatewayEvent | APIGatewayProxyEventV2 | ALBEv
     if (event.headers?.Referer) {
       httpTags["http.referer"] = event.headers.Referer;
     }
+    if (event.routeKey) {
+      // "GET /my/endpoint" => "/my/endpoint"
+      const array = event.routeKey.split(" ");
+      httpTags["http.route"] = array[array.length - 1];
+    }
     return httpTags;
   }