fix(headers): extract headers parameter (#218)

package.json

@@ -32,9 +32,10 @@
   "author": "Daniel Schmidt <[email protected]>",
   "license": "MIT",
   "peerDependencies": {
-    "apollo-server-env": "< 2.4.5",
-    "graphql": "0.10.x - 14.x.x",
-    "opentracing": "*"
+    "apollo-server-env": "*",
+    "graphql": "0.10.x - 14.2.x",
+    "opentracing": "*",
+    "apollo-server": "^2.4.8"
   },
   "dependencies": {
     "graphql-extensions": "^0.6.0"

src/index.ts

@@ -104,16 +104,34 @@ export default class OpentracingExtension<TContext extends SpanContext>
     this.onFieldResolve = onFieldResolve;
   }
 
+  mapToObj(inputMap: Map<string, any>) {
+    let obj: { [key: string]: string } = {};
+
+    inputMap.forEach(function(value, key){
+      obj[key] = value
+    });
+
+    return obj;
+  }
+
   requestDidStart(infos: RequestStart) {
     if (!this.shouldTraceRequest(infos)) {
       return;
     }
 
+    let headers
+    let tmpHeaders = infos.request && infos.request.headers as unknown as Map<string, any>
+    if (tmpHeaders && typeof tmpHeaders.get === 'function') {
+      headers = this.mapToObj(tmpHeaders)
+    } else {
+      headers = tmpHeaders
+    }
+
     const externalSpan =
       infos.request && infos.request.headers
         ? this.serverTracer.extract(
             opentracing.FORMAT_HTTP_HEADERS,
-            infos.request.headers
+            headers
           )
         : undefined;