You can apply CallCredentials to ChannelCredentials through
grpc.composite_channel_credentials.
I believe its use is for authorization but it essentially adds metadata for
every call. You need to connect to a secure channel to use it though.
transport_creds = grpc.ssl_channel_credentials(open('roots.pem').read())
def credentials(context, callback):
callback([('key','value')], None)
auth_creds = grpc.metadata_call_credentials(credentials)
channel_creds = grpc.composite_channel_credentials(transport_creds, auth_creds)
channel = grpc.secure_channel('greeter.googleapis.com:443', channel_creds)
A better option might be to create a shim layer that just passes on the
call while adding some metadata. Could probably achieve that with some
__getattr__ magic
On Tuesday, February 14, 2017 at 12:16:42 PM UTC, [email protected] wrote:
>
> I'd like to add some metadata like token or version at each call, and
> server should check it.
>
> I know how to add meta for each call (metadata argument), however, Is
> there a way to add metadata globally for client？
>
> I know how to get metadata in each server context
> (context.invocation_metadata()), however, is there something like
> middleware to check it globally？
>
> Thanks!
>
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