Chronos - An efficient library for asynchronous programming
https://status-im.github.io/nim-chronos/
5dfa3fd7fa
```nim
import chronos
proc f(): Future[void] {.async: (raises: []).} =
discard
discard f() or f() or f()
```
```
/Users/etan/Documents/Repos/nimbus-eth2/vendor/nim-chronos/chronos/internal/raisesfutures.nim(145, 44) union
/Users/etan/Documents/Repos/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/core/macros.nim(185, 28) []
/Users/etan/Documents/Repos/nimbus-eth2/test.nim(6, 13) template/generic instantiation of `or` from here
/Users/etan/Documents/Repos/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(1668, 39) template/generic instantiation of `union` from here
/Users/etan/Documents/Repos/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/core/macros.nim(185, 28) Error: illegal conversion from '-1' to '[0..9223372036854775807]'
```
Fix by checking for `void` before trying to access `raises`
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|---|---|---|
| .github/workflows | ||
| chronos | ||
| docs | ||
| tests | ||
| .gitignore | ||
| LICENSE-APACHEv2 | ||
| LICENSE-MIT | ||
| README.md | ||
| chronos.nim | ||
| chronos.nimble | ||
| config.nims | ||
| nim.cfg | ||
README.md
Chronos - An efficient library for asynchronous programming
Introduction
Chronos is an efficient async/await framework for Nim. Features include:
- Asynchronous socket and process I/O
- HTTP server with SSL/TLS support out of the box (no OpenSSL needed)
- Synchronization primitivies like queues, events and locks
- Cancellation
- Efficient dispatch pipeline with excellent multi-platform support
- Exceptional error handling features, including
raisestracking
Getting started
Install chronos using nimble:
nimble install chronos
or add a dependency to your .nimble file:
requires "chronos"
and start using it:
import chronos/apps/http/httpclient
proc retrievePage(uri: string): Future[string] {.async.} =
# Create a new HTTP session
let httpSession = HttpSessionRef.new()
try:
# Fetch page contents
let resp = await httpSession.fetch(parseUri(uri))
# Convert response to a string, assuming its encoding matches the terminal!
bytesToString(resp.data)
finally: # Close the session
await noCancel(httpSession.closeWait())
echo waitFor retrievePage(
"https://raw.githubusercontent.com/status-im/nim-chronos/master/README.md")
Documentation
See the user guide.
Projects using chronos
- libp2p - Peer-to-Peer networking stack implemented in many languages
- presto - REST API framework
- Scorper - Web framework
- 2DeFi - Decentralised file system
- websock - WebSocket library with lots of features
chronos is available in the Nim Playground
Submit a PR to add yours!
TODO
- Multithreading Stream/Datagram servers
Contributing
When submitting pull requests, please add test cases for any new features or fixes and make sure nimble test is still able to execute the entire test suite successfully.
chronos follows the Status Nim Style Guide.
License
Licensed and distributed under either of
- MIT license: LICENSE-MIT or http://opensource.org/licenses/MIT
or
- Apache License, Version 2.0, (LICENSE-APACHEv2 or http://www.apache.org/licenses/LICENSE-2.0)
at your option. These files may not be copied, modified, or distributed except according to those terms.