port-utils: Utilities for creating and waiting on ports

[ bsd3, library, unclassified ] [ Propose Tags ]

Utilities for creating and waiting on ports.

openFreePort will create a socket bound to a random port (like warp's openFreePort).

wait will attempt to connect to given host and port repeatedly until successful.


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Versions [faq] 0.1.0.0, 0.1.0.1, 0.1.0.2, 0.1.0.3, 0.1.0.4, 0.2.0.0
Change log ChangeLog.md
Dependencies base (>=4.7 && <5), network [details]
License BSD-3-Clause
Copyright 2018 Jonathan Fischoff
Author Jonathan Fischoff
Maintainer jonathangfischoff@gmail.com
Home page https://github.com/jfischoff/port-utils#readme
Bug tracker https://github.com/jfischoff/port-utils/issues
Source repo head: git clone https://github.com/jfischoff/port-utils
Uploaded by JonathanFischoff at Sun Nov 4 04:16:05 UTC 2018
Distributions LTSHaskell:0.2.0.0, NixOS:0.2.0.0, Stackage:0.2.0.0
Downloads 345 total (40 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2018-11-04 [all 1 reports]

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Readme for port-utils-0.2.0.0

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port-utils

openFreePort

This is another version of warp's openFreePort function. This function has fewer dependencies than the warp version.

openFreePort returns a socket on a random port and the port it has been bound to.

openFreePort :: IO (Int, Socket)

wait

wait will attempt to connect to a host and port until it is successful. Between each unsuccessful attempt, it sleeps for 10 ms.

Here is an example of the primary function:

import Network.Socket.Wait (wait)

void $ forkIO $ Warp.run 7000 app
-- Wait for the server to start listening on the socket
wait "127.0.0.1" 7000
-- Communicate with the server
...

In bash one could write:

while ! nc -z localhost 7000 ; do sleep 0.01 ; done

The bash script above was copied from this stackoverflow answer https://stackoverflow.com/a/50008755