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https://issues.apache.org/jira/browse/BEAM-7746?focusedWorklogId=396640&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-396640
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ASF GitHub Bot logged work on BEAM-7746:
----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Mar/20 05:37
Start Date: 03/Mar/20 05:37
Worklog Time Spent: 10m
Work Description: chadrik commented on pull request #11022: [BEAM-7746]
Resolve typing issues in filesystem
URL: https://github.com/apache/beam/pull/11022
In order to properly type some of the complexities around the `filesystem`
API I had to address 2 main problems:
- properly type `CompressedFile`
- add `Compressor` and `Decompressor` protocols
- make it a `BinaryIO` subclass. this is necessary to guarantee that all
the file-like things that are floating around these modules actually present
the same interface. unfortunately, this is not a protocol, so it must be
subclassed. this required a few breaking changes:
- `writeable` renamed to `writable`
- `closed` method changed to a property
- `seekable` property changed a method
- `read` arg changed name
- `write` arg changed name
- add a new `create_buffered()` classmethod to `DownloaderStream` and
`UploaderStream`
- simplifies the creation of buffered wrappers to the classes
- this was motivated primarily by the desire to consolidate this pattern
into one place so that I could handle the unfortunate need to `cast` these
types to `BinaryIO`. see notes on `DownloaderStream.create_buffered()` for
why this was necessary.
---
This PR makes one significant runtime change that must be vetted.
`s3io.S3IO.open()` originally created a buffered `DownloaderStream` like
this:
```python
return io.BufferedReader(
DownloaderStream(downloader, mode=mode),
buffer_size=read_buffer_size)
```
All other IO clients pass `read_buffer_size` to `DownloaderStream`, like
this example from `gcsio`:
```python
return io.BufferedReader(
DownloaderStream(downloader, read_buffer_size=read_buffer_size,
mode=mode),
buffer_size=read_buffer_size)
```
I was hoping to standardize on that behavior in order to simplify
`create_buffered`, but I don't know whether this difference was intentional or
not, or what the impact of changing it would be.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 396640)
Time Spent: 69.5h (was: 69h 20m)
> Add type hints to python code
> -----------------------------
>
> Key: BEAM-7746
> URL: https://issues.apache.org/jira/browse/BEAM-7746
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Chad Dombrova
> Assignee: Chad Dombrova
> Priority: Major
> Time Spent: 69.5h
> Remaining Estimate: 0h
>
> As a developer of the beam source code, I would like the code to use pep484
> type hints so that I can clearly see what types are required, get completion
> in my IDE, and enforce code correctness via a static analyzer like mypy.
> This may be considered a precursor to BEAM-7060
> Work has been started here: [https://github.com/apache/beam/pull/9056]
>
>
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