[GitHub] [incubator-opendal] Xuanwo commented on a diff in pull request #1801: feat(gcs): add support for gcs append

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo commented on code in PR #1801:
URL: https://github.com/apache/incubator-opendal/pull/1801#discussion_r1152753889


##########
core/src/services/gcs/backend.rs:
##########
@@ -625,6 +641,85 @@ impl GcsBackend {
 
         self.client.send_async(req).await
     }
+
+    async fn gcs_initiate_multipart_upload(
+        &self,
+        path: &str,
+    ) -> Result<Response<IncomingAsyncBody>> {
+        let p = build_abs_path(&self.root, path);
+        let url = format!("{}/{}/{}?uploads", self.endpoint, self.bucket, p);
+        let mut req = Request::post(&url)
+            .body(AsyncBody::Empty)
+            .map_err(new_request_build_error)?;
+        self.signer.sign(&mut req).map_err(new_request_sign_error)?;
+        self.client.send_async(req).await
+    }
+
+    pub fn gcs_upload_part_request(
+        &self,
+        path: &str,
+        upload_id: &str,
+        part_number: usize,
+        size: Option<u64>,
+        body: AsyncBody,
+    ) -> Result<Request<AsyncBody>> {
+        let p = build_abs_path(&self.root, path);
+        let url = format!(
+            "{}/{}/{}?partNumber={}&uploadId={}",

Review Comment:
   This API is part of gcs's XML API is can't be used here. We should use gcs's JSON API. For example: https://cloud.google.com/storage/docs/resumable-uploads



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