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extensions/default/src/MergeDataSource/index.ts

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+import { DicomMetadataStore, IWebApiDataSource } from '@ohif/core';
+import { get, uniqBy } from 'lodash';
+import {
+  MergeConfig,
+  CallForAllDataSourcesAsyncOptions,
+  CallForAllDataSourcesOptions,
+  CallForDefaultDataSourceOptions,
+  CallByRetrieveAETitleOptions,
+  MergeMap,
+} from './types';
+
+export const mergeMap: MergeMap = {
+  'query.studies.search': {
+    mergeKey: 'studyInstanceUid',
+    tagFunc: x => x,
+  },
+  'query.series.search': {
+    mergeKey: 'seriesInstanceUid',
+    tagFunc: (series, sourceName) => {
+      series.forEach(series => {
+        series.RetrieveAETitle = sourceName;
+        DicomMetadataStore.updateSeriesMetadata(series);
+      });
+      return series;
+    },
+  },
+};
+
+/**
+ * Calls all data sources asynchronously and merges the results.
+ * @param {CallForAllDataSourcesAsyncOptions} options - The options for calling all data sources.
+ * @param {string} options.path - The path to the function to be called on each data source.
+ * @param {unknown[]} options.args - The arguments to be passed to the function.
+ * @param {ExtensionManager} options.extensionManager - The extension manager.
+ * @param {string[]} options.dataSourceNames - The names of the data sources to be called.
+ * @param {string} options.defaultDataSourceName - The name of the default data source.
+ * @returns {Promise<unknown[]>} - A promise that resolves to the merged data from all data sources.
+ */
+export const callForAllDataSourcesAsync = async ({
+  mergeMap,
+  path,
+  args,
+  extensionManager,
+  dataSourceNames,
+  defaultDataSourceName,
+}: CallForAllDataSourcesAsyncOptions) => {
+  const { mergeKey, tagFunc } = mergeMap[path] || { tagFunc: x => x };
+
+  /** Sort by default data source */
+  const defs = Object.values(extensionManager.dataSourceDefs);
+  const defaultDataSourceDef = defs.find(def => def.sourceName === defaultDataSourceName);
+  const dataSourceDefs = defs.filter(def => def.sourceName !== defaultDataSourceName);
+  if (defaultDataSourceDef) {
+    dataSourceDefs.unshift(defaultDataSourceDef);
+  }
+
+  const promises = [];
+  const sourceNames = [];
+
+  for (const dataSourceDef of dataSourceDefs) {
+    const { configuration, sourceName } = dataSourceDef;
+    if (!!configuration && dataSourceNames.includes(sourceName)) {
+      const [dataSource] = extensionManager.getDataSources(sourceName);
+      const func = get(dataSource, path);
+      const promise = func.apply(dataSource, args);
+      promises.push(promise);
+      sourceNames.push(sourceName);
+    }
+  }
+
+  const data = await Promise.allSettled(promises);
+  const mergedData = data.map((data, i) => tagFunc(data.value, sourceNames[i]));
+
+  let results = [];
+  if (mergeKey) {
+    results = uniqBy(mergedData.flat(), obj => get(obj, mergeKey));
+  } else {
+    results = mergedData.flat();
+  }
+
+  return results;
+};
+
+/**
+ * Calls all data sources that match the provided names and merges their data.
+ * @param options - The options for calling all data sources.
+ * @param options.path - The path to the function to be called on each data source.
+ * @param options.args - The arguments to be passed to the function.
+ * @param options.extensionManager - The extension manager instance.
+ * @param options.dataSourceNames - The names of the data sources to be called.
+ * @param options.defaultDataSourceName - The name of the default data source.
+ * @returns The merged data from all the matching data sources.
+ */
+export const callForAllDataSources = ({
+  path,
+  args,
+  extensionManager,
+  dataSourceNames,
+  defaultDataSourceName,
+}: CallForAllDataSourcesOptions) => {
+  /** Sort by default data source */
+  const defs = Object.values(extensionManager.dataSourceDefs);
+  const defaultDataSourceDef = defs.find(def => def.sourceName === defaultDataSourceName);
+  const dataSourceDefs = defs.filter(def => def.sourceName !== defaultDataSourceName);
+  if (defaultDataSourceDef) {
+    dataSourceDefs.unshift(defaultDataSourceDef);
+  }
+
+  const mergedData = [];
+  for (const dataSourceDef of dataSourceDefs) {
+    const { configuration, sourceName } = dataSourceDef;
+    if (!!configuration && dataSourceNames.includes(sourceName)) {
+      const [dataSource] = extensionManager.getDataSources(sourceName);
+      const func = get(dataSource, path);
+      const data = func.apply(dataSource, args);
+      mergedData.push(data);
+    }
+  }
+
+  return mergedData.flat();
+};
+
+/**
+ * Calls the default data source function specified by the given path with the provided arguments.
+ * @param {CallForDefaultDataSourceOptions} options - The options for calling the default data source.
+ * @param {string} options.path - The path to the function within the default data source.
+ * @param {unknown[]} options.args - The arguments to pass to the function.
+ * @param {string} options.defaultDataSourceName - The name of the default data source.
+ * @param {ExtensionManager} options.extensionManager - The extension manager instance.
+ * @returns {unknown} - The result of calling the default data source function.
+ */
+export const callForDefaultDataSource = ({
+  path,
+  args,
+  defaultDataSourceName,
+  extensionManager,
+}: CallForDefaultDataSourceOptions) => {
+  const [dataSource] = extensionManager.getDataSources(defaultDataSourceName);
+  const func = get(dataSource, path);
+  return func.apply(dataSource, args);
+};
+
+/**
+ * Calls the data source specified by the RetrieveAETitle of the given display set.
+ * @typedef {Object} CallByRetrieveAETitleOptions
+ * @property {string} path - The path of the method to call on the data source.
+ * @property {any[]} args - The arguments to pass to the method.
+ * @property {string} defaultDataSourceName - The name of the default data source.
+ * @property {ExtensionManager} extensionManager - The extension manager.
+ */
+export const callByRetrieveAETitle = ({
+  path,
+  args,
+  defaultDataSourceName,
+  extensionManager,
+}: CallByRetrieveAETitleOptions) => {
+  const [displaySet] = args;
+  const seriesMetadata = DicomMetadataStore.getSeries(
+    displaySet.StudyInstanceUID,
+    displaySet.SeriesInstanceUID
+  );
+  const [dataSource] = extensionManager.getDataSources(
+    seriesMetadata.RetrieveAETitle || defaultDataSourceName
+  );
+  return dataSource[path](...args);
+};
+
+function createMergeDataSourceApi(
+  mergeConfig: MergeConfig,
+  servicesManager: AppTypes.ServicesManager,
+  extensionManager
+) {
+  const { seriesMerge } = mergeConfig;
+  const { dataSourceNames, defaultDataSourceName } = seriesMerge;
+
+  const implementation = {
+    initialize: (...args: unknown[]) =>
+      callForAllDataSources({
+        path: 'initialize',
+        args,
+        extensionManager,
+        dataSourceNames,
+        defaultDataSourceName,
+      }),
+    query: {
+      studies: {
+        search: (...args: unknown[]) =>
+          callForAllDataSourcesAsync({
+            mergeMap,
+            path: 'query.studies.search',
+            args,
+            extensionManager,
+            dataSourceNames,
+            defaultDataSourceName,
+          }),
+      },
+      series: {
+        search: (...args: unknown[]) =>
+          callForAllDataSourcesAsync({
+            mergeMap,
+            path: 'query.series.search',
+            args,
+            extensionManager,
+            dataSourceNames,
+            defaultDataSourceName,
+          }),
+      },
+      instances: {
+        search: (...args: unknown[]) =>
+          callForAllDataSourcesAsync({
+            mergeMap,
+            path: 'query.instances.search',
+            args,
+            extensionManager,
+            dataSourceNames,
+            defaultDataSourceName,
+          }),
+      },
+    },
+    retrieve: {
+      bulkDataURI: (...args: unknown[]) =>
+        callForAllDataSourcesAsync({
+          mergeMap,
+          path: 'retrieve.bulkDataURI',
+          args,
+          extensionManager,
+          dataSourceNames,
+          defaultDataSourceName,
+        }),
+      directURL: (...args: unknown[]) =>
+        callForDefaultDataSource({
+          path: 'retrieve.directURL',
+          args,
+          defaultDataSourceName,
+          extensionManager,
+        }),
+      series: {
+        metadata: (...args: unknown[]) =>
+          callForAllDataSourcesAsync({
+            mergeMap,
+            path: 'retrieve.series.metadata',
+            args,
+            extensionManager,
+            dataSourceNames,
+            defaultDataSourceName,
+          }),
+      },
+    },
+    store: {
+      dicom: (...args: unknown[]) =>
+        callForDefaultDataSource({
+          path: 'store.dicom',
+          args,
+          defaultDataSourceName,
+          extensionManager,
+        }),
+    },
+    deleteStudyMetadataPromise: (...args: unknown[]) =>
+      callForAllDataSources({
+        path: 'deleteStudyMetadataPromise',
+        args,
+        extensionManager,
+        dataSourceNames,
+        defaultDataSourceName,
+      }),
+    getImageIdsForDisplaySet: (...args: unknown[]) =>
+      callByRetrieveAETitle({
+        path: 'getImageIdsForDisplaySet',
+        args,
+        defaultDataSourceName,
+        extensionManager,
+      }),
+    getImageIdsForInstance: (...args: unknown[]) =>
+      callByRetrieveAETitle({
+        path: 'getImageIdsForDisplaySet',
+        args,
+        defaultDataSourceName,
+        extensionManager,
+      }),
+    getStudyInstanceUIDs: (...args: unknown[]) =>
+      callForAllDataSources({
+        path: 'getStudyInstanceUIDs',
+        args,
+        extensionManager,
+        dataSourceNames,
+        defaultDataSourceName,
+      }),
+  };
+
+  return IWebApiDataSource.create(implementation);
+}
+
+export { createMergeDataSourceApi };