Various strategies for sending requests
Project description
aio-request
This library simplifies an interaction between microservices:
- Allows sending requests using various strategies
- Propagates a deadline and a priority of requests
- Exposes client/server metrics
Example:
import aiohttp
import aio_request
async with aiohttp.ClientSession() as client_session:
client = aio_request.setup(
transport=aio_request.AioHttpTransport(client_session),
endpoint="http://endpoint:8080/",
)
response_ctx = client.request(
aio_request.get("thing"),
deadline=aio_request.Deadline.from_timeout(5)
)
async with response_ctx as response:
pass # process response here
Request strategies
The following strategies are supported:
- Single attempt. Only one attempt is sent.
- Sequential. Attempts are sent sequentially with delays between them.
- Parallel. Attempts are sent in parallel one by one with delays between them.
Attempts count and delays are configurable.
Example:
import aiohttp
import aio_request
async with aiohttp.ClientSession() as client_session:
client = aio_request.setup(
transport=aio_request.AioHttpTransport(client_session),
endpoint="http://endpoint:8080/",
)
response_ctx = client.request(
aio_request.get("thing"),
deadline=aio_request.Deadline.from_timeout(5),
strategy=aio_request.parallel_strategy(
attempts_count=3,
delays_provider=aio_request.linear_delays(min_delay_seconds=0.1, delay_multiplier=0.1)
)
)
async with response_ctx as response:
pass # process response here
Deadline & priority propagation
To enable it for the server side a middleware should be configured:
import aiohttp.web
import aio_request
app = aiohttp.web.Application(middlewares=[aio_request.aiohttp_middleware_factory()])
Expose client/server metrics
To enable client metrics a metrics provider should be passed to the transport:
import aiohttp
import aio_request
async with aiohttp.ClientSession() as client_session:
client = aio_request.setup(
transport=aio_request.AioHttpTransport(
client_session,
metrics_provider=aio_request.PROMETHEUS_METRICS_PROVIDER
),
endpoint="http://endpoint:8080/",
)
It is an example of how it should be done for aiohttp and prometheus.
To enable client metrics a metrics provider should be passed to the middleware:
import aiohttp.web
import aio_request
app = aiohttp.web.Application(
middlewares=[
aio_request.aiohttp_middleware_factory(
metrics_provider=aio_request.PROMETHEUS_METRICS_PROVIDER
)
]
)
Circuit breaker
import aiohttp
import aio_request
async with aiohttp.ClientSession() as client_session:
client = aio_request.setup_v2(
transport=aio_request.AioHttpTransport(client_session),
endpoint="http://endpoint:8080/",
circuit_breaker=aio_request.DefaultCircuitBreaker[str, int](
break_duration=1.0,
sampling_duration=1.0,
minimum_throughput=2,
failure_threshold=0.5,
),
)
In the case of requests count >= minimum throughput(>=2) in sampling period(1 second) the circuit breaker will open if failed requests count/total requests count >= failure threshold(50%).
v0.1.13 (2021-08-15)
v0.1.12 (2021-07-21)
v0.1.11 (2021-07-21)
- Fix Request.update_headers, add Request.extend_headers #59
v0.1.10 (2021-07-20)
- Add Response.is_json property to check whether content-type is json compatible #58
- Tracing support #54,
- Configuration of a new pipeline
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
aio-request-0.1.13.tar.gz
(20.3 kB
view details)
Built Distribution
File details
Details for the file aio-request-0.1.13.tar.gz.
File metadata
- Download URL: aio-request-0.1.13.tar.gz
- Upload date:
- Size: 20.3 kB
- Tags: Source
- Uploaded using Trusted Publishing? No
- Uploaded via: twine/3.4.2 importlib_metadata/4.6.4 pkginfo/1.7.1 requests/2.26.0 requests-toolbelt/0.9.1 tqdm/4.62.1 CPython/3.9.6
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | b0465c687b1ca6b53e8356b0f148257b9ad8adc9bbcb250a476bce237b1027bf |
|
| MD5 | ab62d01f2046fdac98f1c85fc73c7d4f |
|
| BLAKE2b-256 | 790b5ed97e72b4481ccf37c62665e96eb2172604bd1bb9780ed023bab8cb4217 |
Provenance
File details
Details for the file aio_request-0.1.13-py3-none-any.whl.
File metadata
- Download URL: aio_request-0.1.13-py3-none-any.whl
- Upload date:
- Size: 25.4 kB
- Tags: Python 3
- Uploaded using Trusted Publishing? No
- Uploaded via: twine/3.4.2 importlib_metadata/4.6.4 pkginfo/1.7.1 requests/2.26.0 requests-toolbelt/0.9.1 tqdm/4.62.1 CPython/3.9.6
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | c9342e9ad82ee674ecdb16f22da35c434f13347a399d06903847db83701f41de |
|
| MD5 | fead736a5956024badfcb5e373d95f72 |
|
| BLAKE2b-256 | 63b3bc95c0151b5454409c41bd99a8bd091a9368d1976d441ced693ae21c6539 |
