LT-66 Import DICOM Studies

- Add a toolbar in the top of worklist
- Add Import button in the worklist toolbar
- Upload all files in the selected folder to import from client to server
- Import uploaded files via DIMSE
- Delete uploaded files from server when import is completed
- Handle import status in client
- Show/Update progress dialog in client while uploading and importing files
- Show Import button only if import is supported for the default service type (DICOMWeb is currently not supported)

Packages/viewerbase/server/methods/importStudies.js

@@ -0,0 +1,125 @@
+var fs = Npm.require('fs');
+var fiber = Npm.require('fibers');
+
+WebApp.connectHandlers.use('/uploadFilesToImport', function(req, res) {
+    if (!req.headers.filename) {
+        //  Response: BAD REQUEST (400)
+        res.statusCode = 400;
+        res.end();
+    }
+
+    //  Store files in temp location (they will be deleted when their import operations are completed)
+    var dicomDir = '/tmp/dicomDir';
+    createFolderIfNotExist(dicomDir);
+
+    var fullFileName = dicomDir + '/' + req.headers.filename;
+    var file = fs.createWriteStream(fullFileName);
+
+    file.on('error',function(error){
+        console.log(error);
+        //  Response: INTERNAL SERVER ERROR (500)
+        res.statusCode = 400;
+        res.end();
+    });
+    file.on('finish',function(){
+        //  Response: SUCCESS (200)
+        res.writeHead(200, {'Content-Type': 'text/plain'});
+        res.end(fullFileName);
+    });
+
+    //  Pipe the request to the file
+    req.pipe(file);
+});
+
+Meteor.methods({
+    /**
+     * Returns true if import is supported for default service type
+     * @returns {boolean}
+     */
+    importSupported: function() {
+        if (Meteor.settings.dimse && Meteor.settings.defaultServiceType === 'dimse') {
+            return true;
+        }
+        //TODO: Support importing studies into dicomWeb
+        return false;
+    },
+    /**
+     * Imports studies from local into worklist
+     * @param studiesToImport Studies to import
+     * @param studyImportStatusId Study import status collection id to track import status
+     */
+    importStudies: function(studiesToImport, studyImportStatusId) {
+        if (Meteor.settings.dicomWeb && Meteor.settings.defaultServiceType === 'dicomWeb') {
+            //TODO: Support importing studies into dicomWeb
+            console.log('Importing studies into dicomWeb is currently not supported.');
+        } else if (Meteor.settings.dimse && Meteor.settings.defaultServiceType === 'dimse') {
+            importStudiesDIMSE(studiesToImport, studyImportStatusId);
+        } else {
+            throw 'No properly configured server was available over DICOMWeb or DIMSE.';
+        }
+    },
+    /**
+     * Create a new study import status item and insert it into the collection to track import status
+     * @returns {studyImportStatusId: string}
+     */
+    createStudyImportStatus: function() {
+        var studyImportStatus = { numberOfStudiesImported: 0, numberOfStudiesFailed: 0 };
+        return StudyImportStatus.insert(studyImportStatus);
+    },
+    /**
+     * Remove the study import status item from the collection
+     * @param id Collection id of the study import status in the collection
+     */
+    removeStudyImportStatus: function(id) {
+        StudyImportStatus.remove(id);
+    }
+});
+
+function importStudiesDIMSE(studiesToImport, studyImportStatusId) {
+    //  Perform C-Store to import studies and handle the callbacks to update import status
+    DIMSE.storeInstances(studiesToImport, function(err, file) {
+        //  Use fiber to be able to modify meteor collection in callback
+        fiber(function() {
+            //  Update the import status
+            if (err) {
+                StudyImportStatus.update({_id: studyImportStatusId}, {$inc: {'numberOfStudiesFailed': 1}});
+                console.log("Failed to import study via DIMSE: ", file, err);
+            } else {
+                StudyImportStatus.update({_id: studyImportStatusId}, {$inc: {'numberOfStudiesImported': 1}});
+                console.log("Study successfully imported via DIMSE: ", file);
+            }
+
+            //  The import operation of this file is completed, so delete it if still exists
+            if (fileExists(file)) {
+                fs.unlink(file);
+            }
+        }).run();
+    });
+}
+
+function createFolderIfNotExist(folder) {
+    var folderParts = folder.split('/');
+    var folderPart = folderParts[0];
+    for (var i = 1; i < folderParts.length; i++) {
+        folderPart += '/' + folderParts[i];
+        if (!folderExists(folderPart)) {
+            fs.mkdirSync(folderPart);
+        }
+    }
+}
+
+function fileExists(folder) {
+    try {
+        return fs.statSync(folder).isFile();
+    } catch (err) {
+        return false;
+    }
+}
+
+function folderExists(folder) {
+    try {
+        return fs.statSync(folder).isDirectory();
+    } catch (err) {
+        return false;
+    }
+}