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Add more information error if APIHandler receives a non runnable object. #385

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Add more information error if APIHandler receives a non runnable object. #385

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10 changes: 10 additions & 0 deletions langserve/api_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -519,6 +519,16 @@ def __init__(

self._config_keys = config_keys

if not isinstance(runnable, Runnable):
raise TypeError(
f"Expected a Runnable got {type(runnable)} which does not "
"inherit from Runnable. It looks like you're trying to use a "
"an object which is not a runnable as a runnable, which will "
"not work. You could try using a RunnableLambda to create "
"a runnable for your code or else create a Runnable subclass and"
"place the appropriate logic there."
)

self._path = path
self._base_url = prefix + path
self._include_callback_events = include_callback_events
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