https://github.com/jfischoff/port-utils

Utilities for creating and waiting on sockets
https://github.com/jfischoff/port-utils

haskell networking testing

Last synced: 27 days ago
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Utilities for creating and waiting on sockets

• Host: GitHub
• URL: https://github.com/jfischoff/port-utils
• Owner: jfischoff
• License: bsd-3-clause
• Created: 2018-11-02T01:11:25.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2019-04-27T20:41:58.000Z (over 5 years ago)
• Last Synced: 2024-09-29T17:41:58.572Z (about 1 month ago)
• Topics: haskell, networking, testing
• Language: Haskell
• Homepage:
• Size: 47.9 KB
• Stars: 3
• Watchers: 4
• Forks: 2
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: ChangeLog.md
  • License: LICENSE

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README

        
# 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.

```haskell

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:

```haskell

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:

```bash

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