Fix network instrumentation was not reporting concurrent network requests

The task identifier was being set out of the callback implementation so it was being reused, if the session tried to send concurrent requests, only the first one would be reported.

Author: Ignacio Bonafonte

Sources/Instrumentation/URLSession/URLSessionInstrumentation.swift

@@ -114,7 +114,6 @@ public class URLSessionInstrumentation {
                 return
             }
             var originalIMP: IMP?
-            let sessionTaskId = UUID().uuidString
 
             let block: @convention(block) (URLSession, AnyObject) -> URLSessionTask = { session, argument in
                 if let url = argument as? URL {
@@ -130,6 +129,7 @@ public class URLSessionInstrumentation {
 
                 let castedIMP = unsafeBitCast(originalIMP, to: (@convention(c) (URLSession, Selector, Any) -> URLSessionDataTask).self)
                 var task: URLSessionTask
+                let sessionTaskId = UUID().uuidString
 
                 if let request = argument as? URLRequest, objc_getAssociatedObject(argument, &idKey) == nil {
                     let instrumentedRequest = URLSessionLogger.processAndLogRequest(request, sessionTaskId: sessionTaskId, instrumentation: self, shouldInjectHeaders: true)
@@ -161,9 +161,9 @@ public class URLSessionInstrumentation {
                 return
             }
             var originalIMP: IMP?
-            let sessionTaskId = UUID().uuidString
 
             let block: @convention(block) (URLSession, URLRequest, AnyObject) -> URLSessionTask = { session, request, argument in
+                let sessionTaskId = UUID().uuidString
                 let castedIMP = unsafeBitCast(originalIMP, to: (@convention(c) (URLSession, Selector, URLRequest, AnyObject) -> URLSessionDataTask).self)
                 let instrumentedRequest = URLSessionLogger.processAndLogRequest(request, sessionTaskId: sessionTaskId, instrumentation: self, shouldInjectHeaders: true)
                 let task = castedIMP(session, selector, instrumentedRequest ?? request, argument)
@@ -190,7 +190,6 @@ public class URLSessionInstrumentation {
                 return
             }
             var originalIMP: IMP?
-            let sessionTaskId = UUID().uuidString
 
             let block: @convention(block) (URLSession, AnyObject, ((Any?, URLResponse?, Error?) -> Void)?) -> URLSessionTask = { session, argument, completion in
 
@@ -216,6 +215,7 @@ public class URLSessionInstrumentation {
 
                 let castedIMP = unsafeBitCast(originalIMP, to: (@convention(c) (URLSession, Selector, Any, ((Any?, URLResponse?, Error?) -> Void)?) -> URLSessionDataTask).self)
                 var task: URLSessionTask!
+                let sessionTaskId = UUID().uuidString
 
                 var completionBlock = completion
 
@@ -275,13 +275,14 @@ public class URLSessionInstrumentation {
                 return
             }
             var originalIMP: IMP?
-            let sessionTaskId = UUID().uuidString
 
             let block: @convention(block) (URLSession, URLRequest, AnyObject, ((Any?, URLResponse?, Error?) -> Void)?) -> URLSessionTask = { session, request, argument, completion in
 
                 let castedIMP = unsafeBitCast(originalIMP, to: (@convention(c) (URLSession, Selector, URLRequest, AnyObject, ((Any?, URLResponse?, Error?) -> Void)?) -> URLSessionDataTask).self)
 
                 var task: URLSessionTask!
+                let sessionTaskId = UUID().uuidString
+
                 var completionBlock = completion
                 if objc_getAssociatedObject(argument, &idKey) == nil {
                     let completionWrapper: (Any?, URLResponse?, Error?) -> Void = { object, response, error in