Utilities for Asynchronous Processing

Classes

AsyncFilter(pipeline, *_args, **_kwargs)	Function object type called by Scanner
AsyncPipeline([threads])	Processes items in an asyncio pipeline
AsyncRequests([cache_fn])	Provides helpers for async access to URLs

Exceptions

EndProcessing	Raised by AsyncFilter to tell AsyncPipeline to stop processing
EndProcessingItem(item, *args)	Raised to indicate that an item should not be processed further

Documentation

class bioconda_utils.aiopipe.AsyncFilter(pipeline, *_args, **_kwargs)

Function object type called by Scanner

abstract async apply(recipe)

Process a recipe. Returns False if processing should stop

async async_init()

Called inside loop before processing

Return type

None

finalize()

Called at the end of a run

Return type

None

class bioconda_utils.aiopipe.AsyncPipeline(threads=None)

Processes items in an asyncio pipeline

add(filt, *args, **kwargs)

Adds Filter to this Scanner

Return type

None

conda_sem: asyncio.Semaphore

must never run more than one conda at the same time (used by PyPi when running skeleton)

filters: List[AsyncFilter]

the filters successively applied to each item

io_sem: asyncio.Semaphore

semaphore to limit io parallelism

loop

our asyncio loop

proc_pool_executor

executor running things in separate python processes

async process(item)

Applies the filters to an item

Return type

bool

run()

Enters the asyncio loop and manages shutdown.

Return type

bool

async run_io(func, *args)

Run func in thread pool executor using args

async run_sp(func, *args)

Run func in process pool executor using args

threads

number of threads to use

class bioconda_utils.aiopipe.AsyncRequests(cache_fn=None)

Provides helpers for async access to URLs

USER_AGENT = 'bioconda/bioconda-utils'

Used as user agent in http requests and as requester in github API requests

cache: Optional[Dict[str, Dict[str, str]]]

cache

async get_checksum_from_ftp(url, _desc=None)

Compute sha256 checksum of content at ftp url

Does not show progress monitor at this time (would need to get file size first)

get_checksum_from_http(url, desc)

Compute sha256 checksum of content at http url

Shows TQDM progress monitor with label desc.

Return type

str

async get_checksum_from_url(url, desc)

Compute sha256 checksum of content at url

• Shows TQDM progress monitor with label desc.

• Caches result

Return type

str

get_file_from_url(fname, url, desc)

Fetch file at url into fname

Shows TQDM progress monitor with label desc.

Return type

None

async get_ftp_listing(url)

Returns list of files at FTP url

get_text_from_url(url)

Fetch content at url and return as text

• On non-permanent errors (429, 502, 503, 504), the GET is retried 10 times with increasing wait times according to fibonacci series.

• Permanent errors raise a ClientResponseError

Return type

str

session: aiohttp.ClientSession

aiohttp session (only exists while running)

exception bioconda_utils.aiopipe.EndProcessing

Raised by AsyncFilter to tell AsyncPipeline to stop processing

exception bioconda_utils.aiopipe.EndProcessingItem(item, *args)

Raised to indicate that an item should not be processed further

log(uselogger=<Logger bioconda_utils.aiopipe (WARNING)>, level=None)

Print message using provided logging func

property name

Name of class