These changes fix a few bugs in the PinSVC API and have been discovered by
running the compliance tool at https://github.com/ipfs-shipyard/pinning-service-compliance.
In particular, the error objects did not respect the spec, filters and counts
were not done right. An additional PR will follow with fixes to the pintracker
because some pin status information was not correctly set.
This commit introduces an api.Cid type and replaces the usage of cid.Cid
everywhere.
The main motivation here is to override MarshalJSON so that Cids are
JSON-ified as '"Qm...."' instead of '{ "/": "Qm....." }', as this "ipld"
representation of IDs is horrible to work with, and our APIs are not issuing
IPLD objects to start with.
Unfortunately, there is no way to do this cleanly, and the best way is to just
switch everything to our own type.
pinsvcapi: do not cache peer information here as all the needed information is
in the status objects.
This adds ipfs_addresses as a field broadcasted with the ping metrics.