Ohif 168 proper error handling (#111)

* Adding a better error handling for DICOMWeb getJson method

* Adding a better error handling for DICOMWeb getBulkData method

* Fixinf some typos. Using console.error to log errors

* Better error handling for DIMSE connections

* Using meteor error in StudyListSearch to better display same error in the client

* Using Meteor.Error for a better pattern. Added an error message in the study list. created connection error types to DICOMWeb connection errors

* Changing error types for server connection. Added better errors for DIMSE server on sockets

* Improving viewer response to error being throw when not finding server to display studies

* OHIF-168: adding catches clauses for retrieveStudyMetada method

* OHIF-168: fixing typo in DIMSE.js

* OHIF-168: setting the session variable  to false when starting a new studylist search

* OHIF-168: Using OHIF.log instead of console

* OHIF-168: removing parsing into string for OHIF.log in Connection.js

* OHIF-168: improving error message visibility in study viewer

Packages/ohif-dicom-services/server/DICOMWeb/getJSON.js

@@ -1,4 +1,5 @@
 import { Meteor } from 'meteor/meteor';
+import { OHIF } from 'meteor/ohif:core';
 
 const http = Npm.require('http');
 const https = Npm.require('https');
@@ -52,14 +53,35 @@ function makeRequest(geturl, options, callback) {
         }
 
         let output = '';
+
         resp.setEncoding('utf8');
-        resp.on('data', function(chunk) {
-            output += chunk;
+
+        resp.on('data', function(chunk){
+          output += chunk;
         });
-        resp.on('end', function() {
-            callback(null, { data: JSON.parse(output) });
+
+        resp.on('error', function (responseError) {
+            OHIF.log.error('There was an error in the DICOMWeb Server')
+            OHIF.log.error(error.stack);
+            OHIF.log.trace();
+
+            callback(new Meteor.Error('server-internal-error', responseError.message), null);
+        });
+
+        resp.on('end', function(){
+          callback(null, { data: JSON.parse(output) });
         });
     });
+
+    req.on('error', function (requestError) {
+        OHIF.log.error('Couldn\'t connect to DICOMWeb server.');
+        OHIF.log.error('Make sure you are trying to connect to the right server and that it is up and running.');
+        OHIF.log.error(requestError.stack);
+        OHIF.log.trace();
+
+        callback(new Meteor.Error('server-connection-error', requestError.message), null);
+    });
+
     req.end();
 }
 
@@ -67,7 +89,7 @@ const makeRequestSync = Meteor.wrapAsync(makeRequest);
 
 DICOMWeb.getJSON = function(geturl, options) {
     if (options.logRequests) {
-        console.log(geturl);
+        OHIF.log.info(geturl);
     }
 
     if (options.logTiming) {
@@ -81,7 +103,7 @@ DICOMWeb.getJSON = function(geturl, options) {
     }
 
     if (options.logResponses) {
-        console.log(result);
+        OHIF.log.info(result);
     }
 
     return result;