Extract HTTP ingestion API interactions and refactor #160
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Gets us into a better position for testing significant changes and future additions :-)
SeqIngestionApi
now provides a (very thin) abstraction over the POSTs to the ingestion endpoint. This gets a lot of duplication out of the sinks, and makes unit testing the sinks (and eventuallyHttpLogShipper
) easier.I haven't tried to completely abstract away the HTTP-dependent aspect of this, since there's not currently any great benefit from doing so, and we'll end up having to clutter the code up by defining our own equivalents of HTTP status codes etc.
There are only two behavioral changes here (that I know of) which deserve a call-out.
Response bodies will no longer be written to
SelfLog
by the durable sink when logging fails. Done for simplification; the ingestion log should cover this case, and we don't do it in batched or audit mode, so seems reasonable to stop doing it in durable mode.If we want to add this back for additional diagnostics, providing some hooks at the top level for handling failed ingestion response bodies would be better.
Audit sink writes will read the full response, though they'll discard it. Probably irrelevant, since the responses are tiny and would more than likely have been buffered in the network stack before the response reaches us.