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45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
from __future__ import print_function
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import json
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import os
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def handler(event, context):
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"""
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The handler function is the function which gets called each time
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the lambda is run.
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"""
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# printing goes to the cloudwatch log allowing us to simply debug the lambda if we can find
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# the log entry.
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print("got event:\n" + json.dumps(event))
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# if the name parameter isn't present this can throw an exception
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# which will result in an amazon chosen failure from the lambda
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# which can be completely fine.
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name = event["name"]
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# we can use environment variables as part of the configuration of the lambda
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# which can change the behaviour of the lambda without needing a new upload
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extra = os.environ.get("EXTRA_MESSAGE")
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if extra is not None and len(extra) > 0:
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greeting = "hello {0}. {1}".format(name, extra)
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else:
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greeting = "hello " + name
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return {"message": greeting}
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def main():
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"""
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This main function will normally never be called during normal
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lambda use. It is here for testing the lambda program only.
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"""
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event = {"name": "james"}
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context = None
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print(handler(event, context))
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if __name__ == '__main__':
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main()
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