Add option to get named firestore instance for v2 firestore functions (#1550)

* adding option to get named firestore instance for v2 firestore functions

* add changelog entry

Author: colerogers

CHANGELOG.md

@@ -0,0 +1 @@
+- Add option to get named firestore instance for v2 firestore functions (#1550).

src/common/providers/firestore.ts

@@ -52,9 +52,9 @@ function _getValueProto(data: any, resource: string, valueFieldName: string) {
 }
 
 /** @internal */
-export function createSnapshotFromProtobuf(data: Uint8Array, path: string) {
+export function createSnapshotFromProtobuf(data: Uint8Array, path: string, databaseId: string) {
   if (!firestoreInstance) {
-    firestoreInstance = firestore.getFirestore(getApp());
+    firestoreInstance = firestore.getFirestore(databaseId);
   }
   try {
     const dataBuffer = Buffer.from(data);
@@ -68,9 +68,13 @@ export function createSnapshotFromProtobuf(data: Uint8Array, path: string) {
 }
 
 /** @internal */
-export function createBeforeSnapshotFromProtobuf(data: Uint8Array, path: string) {
+export function createBeforeSnapshotFromProtobuf(
+  data: Uint8Array,
+  path: string,
+  databaseId: string
+) {
   if (!firestoreInstance) {
-    firestoreInstance = firestore.getFirestore(getApp());
+    firestoreInstance = firestore.getFirestore(databaseId);
   }
   try {
     const dataBuffer = Buffer.from(data);
@@ -88,10 +92,13 @@ export function createSnapshotFromJson(
   data: any,
   source: string,
   createTime: string | undefined,
-  updateTime: string | undefined
+  updateTime: string | undefined,
+  databaseId?: string
 ) {
   if (!firestoreInstance) {
-    firestoreInstance = firestore.getFirestore(getApp());
+    firestoreInstance = databaseId
+      ? firestore.getFirestore(databaseId)
+      : firestore.getFirestore(getApp());
   }
   const valueProto = _getValueProto(data, source, "value");
   let timeString = createTime || updateTime;
@@ -110,11 +117,15 @@ export function createBeforeSnapshotFromJson(
   data: any,
   source: string,
   createTime: string | undefined,
-  updateTime: string | undefined
+  updateTime: string | undefined,
+  databaseId?: string
 ) {
   if (!firestoreInstance) {
-    firestoreInstance = firestore.getFirestore(getApp());
+    firestoreInstance = databaseId
+      ? firestore.getFirestore(databaseId)
+      : firestore.getFirestore(getApp());
   }
+
   const oldValueProto = _getValueProto(data, source, "oldValue");
   const oldReadTime = dateToTimestampProto(createTime || updateTime);
   return firestoreInstance.snapshot_(oldValueProto, oldReadTime, "json");

src/v2/providers/firestore.ts

@@ -532,13 +532,14 @@ function getPath(event: RawFirestoreEvent): string {
 /** @internal */
 export function createSnapshot(event: RawFirestoreEvent): QueryDocumentSnapshot {
   if (event.datacontenttype?.includes("application/protobuf") || Buffer.isBuffer(event.data)) {
-    return createSnapshotFromProtobuf(event.data as Uint8Array, getPath(event));
+    return createSnapshotFromProtobuf(event.data as Uint8Array, getPath(event), event.database);
   } else if (event.datacontenttype?.includes("application/json")) {
     return createSnapshotFromJson(
       event.data,
       event.source,
       (event.data as RawFirestoreData).value?.createTime,
-      (event.data as RawFirestoreData).value?.updateTime
+      (event.data as RawFirestoreData).value?.updateTime,
+      event.database
     );
   } else {
     logger.error(
@@ -551,13 +552,18 @@ export function createSnapshot(event: RawFirestoreEvent): QueryDocumentSnapshot
 /** @internal */
 export function createBeforeSnapshot(event: RawFirestoreEvent): QueryDocumentSnapshot {
   if (event.datacontenttype?.includes("application/protobuf") || Buffer.isBuffer(event.data)) {
-    return createBeforeSnapshotFromProtobuf(event.data as Uint8Array, getPath(event));
+    return createBeforeSnapshotFromProtobuf(
+      event.data as Uint8Array,
+      getPath(event),
+      event.database
+    );
   } else if (event.datacontenttype?.includes("application/json")) {
     return createBeforeSnapshotFromJson(
       event.data,
       event.source,
       (event.data as RawFirestoreData).oldValue?.createTime,
-      (event.data as RawFirestoreData).oldValue?.updateTime
+      (event.data as RawFirestoreData).oldValue?.updateTime,
+      event.database
     );
   } else {
     logger.error(