jthomas commented on a change in pull request #3: support large arguments
URL:
https://github.com/apache/incubator-openwhisk-runtime-docker/pull/3#discussion_r164169939
##########
File path: core/actionProxy/actionproxy.py
##########
@@ -127,18 +127,29 @@ def error(msg):
try:
input = json.dumps(args)
- p = subprocess.Popen(
- [self.binary, input],
- stdout=subprocess.PIPE,
- stderr=subprocess.PIPE,
- env=env)
+ if len(input) > 131071: # MAX_ARG_STRLEN (131071)
linux/binfmts.h
+ # pass argument via stdin
+ p = subprocess.Popen(
+ [self.binary],
+ stdin=subprocess.PIPE,
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE,
+ env=env)
+ else:
+ # pass argument via stdin and command parameter
Review comment:
I agree with this. `stdin` should be the default. Input can be passed as an
argument as well but not if it's larger than 128K. Switching methods on size
makes it complicated for those implementing the actions.
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