module/apmhttp: add status code to client spans

internal/apmschema/jsonschema/metricsets/common_metricset.json

@@ -6,7 +6,7 @@
     "properties": {
         "samples": {
             "type": ["object"],
-            "description": "Sampled application metrics collected from the agent",
+            "description": "Sampled application metrics collected from the agent.",
             "patternProperties": {
                 "^[^*\"]*$": {
                     "$ref": "sample.json"
@@ -16,7 +16,7 @@
         },
         "tags": {
             "type": ["object", "null"],
-            "description": "A flat mapping of user-defined tags with string values",
+            "description": "A flat mapping of user-defined tags with string values.",
             "patternProperties": {
                 "^[^*\"]*$": {
                     "type": ["string", "null"],

internal/apmschema/jsonschema/service.json

@@ -25,15 +25,14 @@
             "type": ["object", "null"],
             "properties": {
                 "name": {
-                    "type": "string",
+                    "type": ["string", "null"],
                     "maxLength": 1024
                 },
                 "version": {
-                    "type": "string",
+                    "type": ["string", "null"],
                     "maxLength": 1024
                 }
-            },
-            "required": ["name", "version"]
+            }
         },
         "language": {
             "description": "Name and version of the programming language used",

internal/apmschema/jsonschema/spans/common_span.json

@@ -35,6 +35,15 @@
                         "url": {
                             "type": ["string", "null"],
                             "description": "The raw url of the correlating http request."
+                        },
+                        "status_code": {
+                            "type": ["integer", "null"],
+                            "description": "The status code of the http request."
+                        },
+                        "method": {
+                            "type": ["string", "null"],
+                            "maxLength": 1024,
+                            "description": "The method of the http request."
                         }
                     }
                 },
@@ -64,6 +73,10 @@
             "type": "string",
             "description": "Keyword of specific relevance in the service's domain (eg: 'db.postgresql.query', 'template.erb', etc)",
             "maxLength": 1024
+        },
+        "sync": {
+            "type": ["boolean", "null"],
+            "description": "Indicates whether the span was executed synchronously or asynchronously."
         }
     },
     "required": ["duration", "name", "type"]

internal/apmschema/jsonschema/spans/v2_span.json

@@ -30,6 +30,16 @@
                 "start": {
                     "type": ["number", "null"],
                     "description": "Offset relative to the transaction's timestamp identifying the start of the span, in milliseconds"
+                },
+                "subtype": {
+                    "type": ["string", "null"],
+                    "description": "A further sub-division of the type (e.g. postgresql, elasticsearch)",
+                    "maxLength": 1024
+                },
+                "action": {
+                    "type": ["string", "null"],
+                    "description": "The specific kind of event within the sub-type represented by the span (e.g. query, connect)",
+                    "maxLength": 1024
                 }
             },
             "required": ["id", "transaction_id", "trace_id", "parent_id"]

model/marshal.go

@@ -35,7 +35,8 @@ func (t *Time) UnmarshalJSON(data []byte) error {
 // UnmarshalJSON unmarshals the JSON data into v.
 func (v *HTTPSpanContext) UnmarshalJSON(data []byte) error {
 	var httpSpanContext struct {
-		URL string
+		URL        string
+		StatusCode int `json:"status_code"`
 	}
 	if err := json.Unmarshal(data, &httpSpanContext); err != nil {
 		return err
@@ -45,6 +46,7 @@ func (v *HTTPSpanContext) UnmarshalJSON(data []byte) error {
 		return err
 	}
 	v.URL = u
+	v.StatusCode = httpSpanContext.StatusCode
 	return nil
 }
 
@@ -58,6 +60,10 @@ func (v *HTTPSpanContext) MarshalFastJSON(w *fastjson.Writer) error {
 	} else {
 		w.Rewind(beforeURL)
 	}
+	if v.StatusCode > 0 {
+		w.RawString(`,"status_code":`)
+		w.Int64(int64(v.StatusCode))
+	}
 	w.RawByte('}')
 	return nil
 }

model/model.go

@@ -270,6 +270,9 @@ type DatabaseSpanContext struct {
 type HTTPSpanContext struct {
 	// URL is the request URL.
 	URL *url.URL
+
+	// StatusCode holds the HTTP response status code.
+	StatusCode int `json:"status_code,omitempty"`
 }
 
 // Context holds contextual information relating to a transaction or error.

module/apmhttp/client.go

@@ -81,11 +81,11 @@ func (r *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 
 	name := r.requestName(req)
 	span := tx.StartSpan(name, "external.http", apm.SpanFromContext(ctx))
-	span.Context.SetHTTPRequest(req)
 	if !span.Dropped() {
 		traceContext = span.TraceContext()
 		ctx = apm.ContextWithSpan(ctx, span)
 		req = RequestWithContext(ctx, req)
+		span.Context.SetHTTPRequest(req)
 	} else {
 		span.End()
 		span = nil
@@ -97,6 +97,7 @@ func (r *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 		if err != nil {
 			span.End()
 		} else {
+			span.Context.SetHTTPStatusCode(resp.StatusCode)
 			resp.Body = &responseBody{span: span, body: resp.Body}
 		}
 	}

module/apmhttp/client_test.go

@@ -59,7 +59,8 @@ func TestClient(t *testing.T) {
 	assert.Equal(t, &model.SpanContext{
 		HTTP: &model.HTTPSpanContext{
 			// Note no user info included in server.URL.
-			URL: serverURL,
+			URL:        serverURL,
+			StatusCode: statusCode,
 		},
 	}, span.Context)
 

spancontext.go

@@ -80,3 +80,9 @@ func (c *SpanContext) SetHTTPRequest(req *http.Request) {
 	c.http.URL = req.URL
 	c.model.HTTP = &c.http
 }
+
+// SetHTTPStatusCode records the HTTP response status code.
+func (c *SpanContext) SetHTTPStatusCode(statusCode int) {
+	c.http.StatusCode = statusCode
+	c.model.HTTP = &c.http
+}