[firestore-bigquery-export] Add lifecycle event

firestore-bigquery-export/CHANGELOG.md

@@ -8,6 +8,8 @@ feature - add oldData to the record
 
 fixed - updating table metadata too often
 
+feature - add lifecycle event to export existing documents to Bigquery
+
 ## Version 0.1.26
 
 docs - correct service account name

firestore-bigquery-export/POSTINSTALL.md

@@ -64,7 +64,9 @@ When defining a specific BigQuery project, a manual step to set up permissions i
 
 ### _(Optional)_ Import existing documents
 
-This extension only sends the content of documents that have been changed -- it does not export your full dataset of existing documents into BigQuery. So, to backfill your BigQuery dataset with all the documents in your collection, you can run the import script provided by this extension.
+If you chose not to automatically import existing documents when you installed this extension, you can backfill your BigQuery dataset with all the documents in your collection using the import script.
+
+If you don't either enable automatic import or run the import script, the extension only exports the content of documents that are created or changed after installation.
 
 The import script can read all existing documents in a Cloud Firestore collection and insert them into the raw changelog table created by this extension. The script adds a special changelog for each document with the operation of `IMPORT` and the timestamp of epoch. This is to ensure that any operation on an imported document supersedes the `IMPORT`.
 

firestore-bigquery-export/PREINSTALL.md

@@ -49,9 +49,13 @@ The response should be indentical in structure.
 
 #### Backfill your BigQuery dataset
 
-This extension only sends the content of documents that have been changed -- it does not export your full dataset of existing documents into BigQuery. So, to backfill your BigQuery dataset with all the documents in your collection, you can run the [import script](https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md) provided by this extension.
+To import documents that already exist at installation time into BigQuery, answer **Yes** when the installer asks "Import existing Firestore documents into BigQuery?" The extension will export existing documents as part of the installation and update processes.
 
-**Important:** Run the import script over the entire collection _after_ installing this extension, otherwise all writes to your database during the import might be lost.
+Alternatively, you can run the external [import script](https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md) to backfill existing documents. If you plan to use this script, answer **No** when prompted to import existing documents.
+
+**Important:** Run the external import script over the entire collection _after_ installing this extension, otherwise all writes to your database during the import might be lost.
+
+If you don't either enable automatic import or run the import script, the extension only exports the content of documents that are created or changed after installation.
 
 #### Generate schema views
 

firestore-bigquery-export/README.md

@@ -57,9 +57,13 @@ The response should be indentical in structure.
 
 #### Backfill your BigQuery dataset
 
-This extension only sends the content of documents that have been changed -- it does not export your full dataset of existing documents into BigQuery. So, to backfill your BigQuery dataset with all the documents in your collection, you can run the [import script](https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md) provided by this extension.
+To import documents that already exist at installation time into BigQuery, answer **Yes** when the installer asks "Import existing Firestore documents into BigQuery?" The extension will export existing documents as part of the installation and update processes.
 
-**Important:** Run the import script over the entire collection _after_ installing this extension, otherwise all writes to your database during the import might be lost.
+Alternatively, you can run the external [import script](https://github.com/firebase/extensions/blob/master/firestore-bigquery-export/guides/IMPORT_EXISTING_DOCUMENTS.md) to backfill existing documents. If you plan to use this script, answer **No** when prompted to import existing documents.
+
+**Important:** Run the external import script over the entire collection _after_ installing this extension, otherwise all writes to your database during the import might be lost.
+
+If you don't either enable automatic import or run the import script, the extension only exports the content of documents that are created or changed after installation.
 
 #### Generate schema views
 
@@ -108,12 +112,20 @@ To install an extension, your project must be on the [Blaze (pay as you go) plan
 
 * Transform function URL: Specify a function URL to call that will transform the payload that will be written to BigQuery. See the pre-install documentation for more details.
 
+* Import existing Firestore documents into BigQuery: Do you want to import existing documents from your Firestore collection into BigQuery? These documents  will have each have a special changelog with the operation of `IMPORT` and the timestamp of epoch. This ensures that any operation on an imported document supersedes the import record.
+
+* Existing documents collection: What is the path of the the Cloud Firestore Collection you would like to import from? (This may, or may not, be the same Collection for which you plan to mirror changes.)
+
+* Docs per backfill: When importing existing documents, how many should be imported at once? The default value of 200 should be ok for most users. If you are using a transform function or have very large documents, you may need to set this to a lower number.
+
 
 
 **Cloud Functions:**
 
 * **fsexportbigquery:** Listens for document changes in your specified Cloud Firestore collection, then exports the changes into BigQuery.
 
+* **fsimportexistingdocs:** Imports exisitng documents in ${param:IMPORT_COLLECTION_PATH} into BigQuery. Imported documents will have a special changelog with the operation of `IMPORT` and the timestamp of epoch.
+
 
 
 **APIs Used**:

firestore-bigquery-export/extension.yaml

@@ -60,6 +60,15 @@ resources:
       eventTrigger:
         eventType: providers/cloud.firestore/eventTypes/document.write
         resource: projects/${param:PROJECT_ID}/databases/(default)/documents/${param:COLLECTION_PATH}/{documentId}
+  - name: fsimportexistingdocs
+    type: firebaseextensions.v1beta.function
+    description:
+      Imports exisitng documents in ${param:IMPORT_COLLECTION_PATH} into BigQuery. Imported documents will have 
+      a special changelog with the operation of `IMPORT` and the timestamp of epoch.
+    properties:
+      location: ${param:LOCATION}
+      runtime: nodejs14
+      taskQueueTrigger: {}
 
 params:
   - param: LOCATION
@@ -352,3 +361,50 @@ params:
         value: no
     default: no
     required: true
+
+  - param: DO_BACKFILL
+    label: Import existing Firestore documents into BigQuery
+    description: >-
+      Do you want to import existing documents from your Firestore collection into BigQuery? These documents 
+      will have each have a special changelog with the operation of `IMPORT` and the timestamp of epoch.
+      This ensures that any operation on an imported document supersedes the import record.
+    type: select
+    default: false
+    options:
+      - label: Yes
+        value: true
+      - label: No
+        value: false
+
+  - param: IMPORT_COLLECTION_PATH
+    label: Existing documents collection
+    description:  >-
+      What is the path of the the Cloud Firestore Collection you would like to import from?
+      (This may, or may not, be the same Collection for which you plan to mirror changes.)
+    type: string
+    example: posts
+    validationRegex: "^[^/]+(/[^/]+/[^/]+)*$"
+    validationErrorMessage: Firestore collection paths must be an odd number of segments separated by slashes, e.g. "path/to/collection".
+    default: posts
+    required: true
+
+  - param: DOCS_PER_BACKFILL
+    label: Docs per backfill
+    description:  >-
+      When importing existing documents, how many should be imported at once?
+      The default value of 200 should be ok for most users.
+      If you are using a transform function or have very large documents, you may need to set this to a lower number.
+    type: string
+    example: 200
+    validationRegex: "^[1-9][0-9]*$"
+    validationErrorMessage: Must be a postive integer.
+    default: 200
+    required: true
+
+lifecycleEvents:
+  onInstall:
+    function: fsimportexistingdocs
+    processingMessage: Checking whether to import existing documents
+  onUpdate:
+    function: fsimportexistingdocs
+    processingMessage: Checking whether to import existing documents