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[C++] Add option to set the default project id in GcsFilesystem #36227

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coryan opened this issue Jun 22, 2023 · 0 comments · Fixed by #36228
Closed

[C++] Add option to set the default project id in GcsFilesystem #36227

coryan opened this issue Jun 22, 2023 · 0 comments · Fixed by #36228

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@coryan
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coryan commented Jun 22, 2023

Describe the enhancement requested

To create a bucket the client library must be configured with a default project. This can be done via the GOOGLE_CLOUD_CPP environment variable, or via google::cloud::storage::ProjectIdOption. There is no way to set the option in the GcsFilesystem class, which forces applications and test to rely on spooky environment variables.

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coryan added a commit to coryan/arrow that referenced this issue Jun 22, 2023
@kou kou changed the title Add option to set the default project id in GcsFilesystem [C++] Add option to set the default project id in GcsFilesystem Jun 22, 2023
kou pushed a commit that referenced this issue Jun 22, 2023
### Rationale for this change

This fixes #36227, originally motivated by the problems in #36119, but seems like a valuable feature in any case.

### What changes are included in this PR?

- Refactor some code to make it testable.
- Add a new `std::optional<std::string>` field to the `GcsOptions` class.

### Are these changes tested?

Yes, I expanded the unit tests.

### Are there any user-facing changes?

Yes. I updated the field documentation.  If I missed some documentation please let me know.

I am also not familiar with the steps required to update the Python wrappers, if there is some documentation to follow I would appreciate it.  I can expand this PR or send a separate one, your call.

* Closes: #36227

Authored-by: Carlos O'Ryan <coryan@google.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>
@kou kou added this to the 13.0.0 milestone Jun 22, 2023
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