API post request now uses HttpClient

lib/api.dart

@@ -388,22 +388,96 @@ class InvenTreeAPI {
     return response;
   }
 
-  // Perform a POST request
-  Future<http.Response> post(String url, {Map<String, dynamic> body}) async {
+  /**
+   * Perform a HTTP POST request
+   * Returns a json object (or null if unsuccessful)
+   */
+  Future<dynamic> post(String url, {Map<String, dynamic> body, int expectedStatusCode=201}) async {
     var _url = makeApiUrl(url);
     var _headers = jsonHeaders();
 
     print("POST: ${_url} -> ${body.toString()}");
 
-    var data = jsonEncode(body);
+    var client = createClient(true);
 
-    return http.post(_url,
-      headers: _headers,
-      body: data,
+    HttpClientRequest request = await client.postUrl(Uri.parse(_url));
+
+    var data = json.encode(body);
+
+    // Set headers
+    // Ref: https://stackoverflow.com/questions/59713003/body-not-sending-using-map-in-flutter
+    request.headers.set('Accept', 'application/json');
+    request.headers.set('Content-type', 'application/json');
+    request.headers.set('Content-Length', data.length.toString());
+
+    if (profile != null) {
+      request.headers.set(
+        HttpHeaders.authorizationHeader,
+        _authorizationHeader(profile.username, profile.password)
       );
     }
 
-  HttpClient _client(bool allowBadCert) {
+    // Add JSON data to the request
+    request.add(utf8.encode(data));
+
+    HttpClientResponse response = await request.close()
+    .timeout(Duration(seconds: 30))
+    .catchError((error) {
+      print("POST request returned error");
+      print("URL: ${_url}");
+      print("Error: ${error.toString()}");
+
+      var ctx = OneContext().context;
+
+      if (error is SocketException) {
+        showServerError(
+          I18N.of(ctx).connectionRefused,
+          error.toString()
+        );
+      } else if (error is TimeoutException) {
+        showTimeoutError(ctx);
+      } else {
+        showServerError(
+          I18N.of(ctx).serverError,
+          error.toString()
+        );
+      }
+
+      return null;
+    });
+
+    if (response == null) {
+      print("null response from POST ${_url}");
+      return null;
+    }
+
+    if (response.statusCode != expectedStatusCode) {
+      showStatusCodeError(response.statusCode);
+      return null;
+    }
+
+    // Convert the body of the response to a JSON object
+    String responseData = await response.transform(utf8.decoder).join();
+
+    try {
+      var data = json.decode(responseData);
+
+      return data;
+
+    } on FormatException {
+
+      print("JSON format exception!");
+      print("${responseData}");
+
+      showServerError(
+          "Format Exception",
+          "JSON data format exception:\n${responseData}"
+      );
+      return null;
+    }
+  }
+
+  HttpClient createClient(bool allowBadCert) {
 
     var client = new HttpClient();
 
@@ -433,7 +507,7 @@ class InvenTreeAPI {
    * Perform a HTTP GET request
    * Returns a json object (or null if did not complete)
    */
-  Future<dynamic> get(String url, {Map<String, String> params}) async {
+  Future<dynamic> get(String url, {Map<String, String> params, int expectedStatusCode=200}) async {
     var _url = makeApiUrl(url);
     var _headers = defaultHeaders();
 
@@ -455,9 +529,7 @@ class InvenTreeAPI {
 
     print("GET: " + _url);
 
-    var client = _client(true);
-
-    print("Created client");
+    var client = createClient(true);
 
     HttpClientRequest request = await client.getUrl(Uri.parse(_url));
 
@@ -470,8 +542,6 @@ class InvenTreeAPI {
       );
     }
 
-    print("Created request: ${request.uri}");
-
     HttpClientResponse response = await request.close()
     .timeout(Duration(seconds: 30))
     .catchError((error) {
@@ -505,7 +575,7 @@ class InvenTreeAPI {
     }
 
     // Check the status code of the response
-    if (response.statusCode != 200) {
+    if (response.statusCode != expectedStatusCode) {
       showStatusCodeError(response.statusCode);
       return null;
     }

lib/barcode.dart

@@ -7,7 +7,6 @@ import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 import 'package:one_context/one_context.dart';
 
-import 'package:device_info/device_info.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
 
 import 'package:InvenTree/inventree/stock.dart';
@@ -21,7 +20,6 @@ import 'package:InvenTree/widget/part_detail.dart';
 import 'package:InvenTree/widget/stock_detail.dart';
 
 import 'dart:io';
-import 'dart:convert';
 
 
 class BarcodeHandler {
@@ -88,30 +86,24 @@ class BarcodeHandler {
       _controller.resumeCamera();
     }
 
-    Future<void> processBarcode(BuildContext context, QRViewController _controller, String barcode, {String url = "barcode/"}) {
+    Future<void> processBarcode(BuildContext context, QRViewController _controller, String barcode, {String url = "barcode/"}) async {
       this._context = context;
       this._controller = _controller;
 
       print("Scanned barcode data: ${barcode}");
 
-      // Send barcode request to server
-      InvenTreeAPI().post(
+      var data = await InvenTreeAPI().post(
           url,
           body: {
-            "barcode": barcode
-          }
-      ).then((var response) {
-
-        if (response.statusCode != 200) {
-          showStatusCodeError(response.statusCode);
-          _controller.resumeCamera();
+            "barcode": barcode,
+          },
+          expectedStatusCode: 200
+      );
 
+      if (data == null) {
         return;
       }
 
-        // Decode the response
-        final Map<String, dynamic> data = json.decode(response.body);
-
       if (data.containsKey('error')) {
         _controller.resumeCamera();
         onBarcodeUnknown(data);
@@ -122,15 +114,6 @@ class BarcodeHandler {
         _controller.resumeCamera();
         onBarcodeUnhandled(data);
       }
-      }).timeout(
-          Duration(seconds: 5)
-      ).catchError((error) {
-
-        showServerError(I18N.of(OneContext().context).error, error.toString());
-        _controller.resumeCamera();
-
-        return;
-      });
     }
 }
 

lib/inventree/model.dart

@@ -262,36 +262,13 @@ class InvenTreeModel {
 
     InvenTreeModel _model;
 
-    await api.post(URL, body: data).timeout(Duration(seconds: 10)).catchError((e) {
-      print("Error during CREATE");
-      print(e.toString());
-
-      if (e is SocketException) {
-        showServerError(
-            I18N.of(context).connectionRefused,
-            e.toString()
-        );
-      }
-      else if (e is TimeoutException) {
-        showTimeoutError(context);
-      } else {
-        // Re-throw the error
-        throw e;
-      }
+    var response = await api.post(URL, body: data);
 
+    if (response == null) {
       return null;
-    })
-    .then((http.Response response) {
-      // Server should return HTTP_201_CREATED
-      if (response.statusCode == 201) {
-        var decoded = json.decode(response.body);
-        _model = createFromJson(decoded);
-      } else {
-        showStatusCodeError(response.statusCode);
     }
-    });
 
-    return _model;
+    return createFromJson(response);
   }
 
   Future<InvenTreePageResponse> listPaginated(int limit, int offset, {Map<String, String> filters}) async {

lib/inventree/stock.dart

@@ -441,27 +441,10 @@ class InvenTreeStockItem extends InvenTreeModel {
         "quantity": "${q}",
         },
         "notes": notes ?? '',
-    }).timeout(Duration(seconds: 10)).catchError((error) {
-      if (error is TimeoutException) {
-        showTimeoutError(context);
-      } else if (error is SocketException) {
-        showServerError(
-            I18N.of(context).connectionRefused,
-            error.toString()
-        );
-      } else {
-        // Re-throw the error
-        throw error;
       }
+    );
 
-      // Null response if error
-      return null;
-    });
-
-    if (response == null) return false;
-
-    if (response.statusCode != 200) {
-      showStatusCodeError(response.statusCode);
+    if (response == null) {
       return false;
     }
 
@@ -508,9 +491,13 @@ class InvenTreeStockItem extends InvenTreeModel {
       data["item"]["quantity"] = "${quantity}";
     }
 
+    print("transfer stock!");
+
     final response = await api.post("/stock/transfer/", body: data);
 
-    return (response.statusCode == 200);
+    print("transfer response: ${response}");
+
+    return response != null;
   }
 }
 

lib/widget/dialogs.dart

@@ -208,8 +208,6 @@ void showFormDialog(String title, {String acceptText, String cancelText, GlobalK
           if (key.currentState.validate()) {
             key.currentState.save();
 
-            print("Saving and closing the dialog");
-
             // Close the dialog
             Navigator.pop(dialogContext);
 

lib/widget/stock_detail.dart

@@ -247,7 +247,7 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
   void _transferStock(BuildContext context, InvenTreeStockLocation location) async {
 
-    double quantity = double.parse(_quantityController.text);
+    double quantity = double.tryParse(_quantityController.text) ?? item.quantity;
     String notes = _notesController.text;
 
     _quantityController.clear();