init

src/dimse/fetchMeta.ts

@@ -0,0 +1,54 @@
+import { sendCFindRequest, IQueryParams } from './findData';
+import { config, ConfParams } from '../utils/config';
+import { fileExists } from '../utils/fileHelper';
+import { LoggerSingleton } from '../utils/logger';
+import { QUERY_LEVEL } from './querLevel';
+import { waitOrFetchDataOnAet } from './fetchData';
+import { parseMeta } from './parseMeta';
+import { Node as DicomNode } from 'dicom-dimse-native';
+
+import path from 'path';
+
+export async function fetchMeta(query: IQueryParams, studyInstanceUID: string, seriesInstanceUID: string): Promise<unknown> {
+  const logger = LoggerSingleton.Instance;
+  const peers = config.get(ConfParams.PEERS) as DicomNode[];
+  const fullMeta = config.get(ConfParams.FULL_META) as boolean;
+
+  for (let i = 0; i < peers.length; i++) {
+    const peer = peers[i];
+    logger.info(`checking peer for data: ${peer.aet}`);
+    const json = (await sendCFindRequest(QUERY_LEVEL.IMAGE, peer, query)) as object;
+
+    // make sure c-find worked
+    if (Object.entries(json).length === 0) {
+      logger.info(`no data found on peer: ${peer.aet}`);
+      continue;
+    }
+
+    if (!fullMeta) {
+      return json;
+    }
+
+    // check if fetch is needed
+    for (const [key] of Object.entries(json)) {
+      const sopInstanceUid = json[key]['00080018'].Value[0];
+      const storagePath = config.get(ConfParams.STORAGE_PATH) as string;
+      const pathname = path.join(storagePath, studyInstanceUID, sopInstanceUid);
+      const exists = await fileExists(pathname);
+      if (!exists) {
+        logger.info(`fetching series ${seriesInstanceUID}`);
+        await waitOrFetchDataOnAet(studyInstanceUID, seriesInstanceUID, '', QUERY_LEVEL.SERIES, peer);
+        break;
+      }
+    }
+    try {
+      const result = await parseMeta(json, studyInstanceUID, seriesInstanceUID);
+      logger.info('parsing finished, resolving');
+      return Promise.resolve(result);
+    } catch (error) {
+      logger.error(error);
+      throw error;
+    }
+  }
+  return Promise.reject('failed fetching meta data');
+}