Add git to filesystem b 301 #350
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| # NOTE: `git init -b` option requires git 2.28 or later. | ||
| subprocess.call(f"git init -b {safe_prefix}master", shell=True, cwd=repo_path) |
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is that somehow more convenient than using gitpython that we have in deps?
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Good question. For gitpython way, do you mean:
- just using
git.<command>(...)instead of the abovesubprocess.call(). Like this https://gitpython.readthedocs.io/en/stable/tutorial.html#using-git-directly ? - Or deeper in the gitpython API? Oh, I think it's read-only.
For me subprocess.call() is easier to read because it looks like git on the command line. I don't want the reader to have to learn a new API to understand the test data. Also it's how I saw test repo done in other fsspec implementations.
The code lines did get kind of long though
I am happy to try the gitpython way. Let me know.
sources/filesystem/__init__.py
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| files_chunk: List[FileItem] = [] | ||
| for file_model in glob_files(fs_client, bucket_url, file_glob): | ||
| file_dict = FileItemDict(file_model, credentials) | ||
| file_dict = FileItemDict(file_model, fs_client) |
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it is way better if we pass credentials here. it often happens that file items are processed in different threads and I'd avoid sharing a single instance of filesystem. if you need to pass additional kwargs I think we have support in credentials for those. so you can just set kwargs to credentials
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ok now I see: we should not pass credentials to FileItemDict, we should pass
FilesystemConfiguration(protocol, credentials, kwargs=kwargs, client_kwargs=client_kwargs)
so that would require changing your branch to the core and in the FileDict implementation change:
@property
def fsspec(self) -> AbstractFileSystem:
to use: fsspec_from_config
looks like big improvement: we can handle parametrized filesystems now
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Looks like a great idea. I'll try it
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it often happens that file items are processed in different threads and I'd avoid sharing a single instance of filesystem.
@rudolfix Note that fsspec instances are cacheable by default. (It is separate to the dir listings cache). Is that a problem , or will each thread get it's own cache?
It can be disabled by passing skip_instance_cache=True on instantiation. I can disable the cache in this PR, but it if needs testing I suggest a separate github issue.
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I have got this working. A question though, about the imports in verified-sources sources/filesystem/__init__.py
from dlt.sources.filesystem import FileItem, FileItemDict, fsspec_filesystem, glob_files
from dlt.sources.credentials import FileSystemCredentials
from dlt.common.storages.fsspec_filesystem import fsspec_from_config
from dlt.common.storages.configuration import FilesystemConfiguration
I added the last two lines. But should I be importing them via dlt.sources.<some_module> instead?
What is the reason for dlt.sources.<some_module> ? Is it some kind of wrapper to expose code to dlt Sources?
Also I no longer need to import fsspec_filesystem (line 2) . Do I remove it in dlt.sources.filesystem too?
- also introduces support for passing keyword argument to fsspec. gitpythonfs is the first use case where the kwargs are needed. - requires future version of dlt that supports gitpython and dynamic registration of fssepc implementations. - requires manual creation of a git repo for testing gitpythonfs - if kwargs are used to construct filesystem instances then FileItemDict must be instantiated with an existing instance of AbstractFileSystem. Instantiating FileItemDict with FileSystemCredentials will omit the fs kwargs and cause unexpected behaviour.
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- objects yielded by @dlt.resource can run in different threads - note this does not address possible bug with filesystem instances being cached by fsspec itself.
Tell us what you do here
verified source)Relevant issue
issue #301
More PR info
@rudolfix please have a quick look and let me know next steps.
CICD issues
I might need assistance with CICD issues on local/github:
not sure what to do with lock file.
Probably due to me working across both dlt repos, which I haven't done before.
Related work: (separate github issues?):
Example pipeline. Provide an example of loading doco files (eg
docs/**.md) to duck db? The existing filesystem examples are about loading row-based data from csv etc, which is not so relevant to git. The example could read from verified-sources repo itself, or refactor the new git repo test fixture to provide a temporary git repo on each example run.Update
sources/filesystem/[README.md](http://readme.md. Ideas: