oleskiewi.cz/httpipe

httpipe

http <-> stdio bridge inspired by https://github.com/openfaas/faas.

Summary

• each function gets a subdirectory
• on GET request, it displays a doc file
• on POST request, it runs handle executable
• handle reads HTTP request body as stdin
• anything that handle writes to stdout is sent as HTTP response
• anything that handle writes to stderr is appended to log file with a timestamp
• every invocation increments runs file with a timestamp

Extras

• caching of (md5-checksummed) input can be handled by contrib/memoize script
• piping works by calling /pipe/{funcs} endpoint
• you can spawn a container for process by replacing normal shebang with contrib/cr

Example

Invoke:

$ envdir ./env ./httpipe  # or...
$ HTTPIPE_DIR=fn ./httpipe  # or...
$ ./httpipe -d fn

The simplest use case is with strings:

$ cat ./fn/b64e/handle
#!/bin/sh -e
base64

$ curl -d "hello world" 0.0.0.0:8080/b64e
aGVsbG8gd29ybGQ=

$ curl -d "aGVsbG8gd29ybGQ=" 0.0.0.0:8080/b64d
hello world%

$ curl -d "hello world=" 0.0.0.0:8080/pipe/b64e/b64d
hello world%

$ cat ./fn/bw/handle
#!/bin/sh -e
convert - -grayscale Rec709Luminance fd:1

$ curl --data-binary @./meme.jpg 0.0.0.0:8080/bw > meme_bw.jpg # or...
$ < ./meme.jpg curl --data-binary @- 0.0.0.0:8080/bw > ./meme_bw.jpg