This change makes the etcd package compatible with the existing Go
ecosystem for module versioning.
Used this tool to update package imports:
https://github.com/KSubedi/gomove
Update to Go 1.12.5 testing. Remove deprecated unused and gosimple
pacakges, and mask staticcheck 1006. Also, fix unconvert errors related
to unnecessary type conversions and following staticcheck errors:
- remove redundant return statements
- use for range instead of for select
- use time.Since instead of time.Now().Sub
- omit comparison to bool constant
- replace T.Fatal and T.Fatalf in tests with T.Error and T.Fatalf respectively because the goroutine calls T.Fatal must be called in the same goroutine as the test
- fix error strings that should not be capitalized
- use sort.Strings(...) instead of sort.Sort(sort.StringSlice(...))
- use he status code of Canceled instead of grpc.ErrClientConnClosing which is deprecated
- use use status.Errorf instead of grpc.Errorf which is deprecated
Related #10528#10438
Add HeaderTimeout field in Config, so users could set timeout for each request.
Before this, one hanged request may block the call for long time. After
this, if the network is good, the user could set short timeout and expect
that API call can attempt next available endpoint quickly.
If the body is closed to stop watching, it will ignore the error from
reading body and return context error.
Before this PR, the cancel when watching always returns error `read tcp
127.0.0.1:57824: use of closed network connection`. After this PR, it
will return expected context canceled error.
1. When reset endpoints, client will choose a random endpoint to pin.
2. If the pinned endpoint is healthy, client will keep using it.
3. If the pinned endpoint becomes unhealthy, client will attempt other
endpoints and update its pin.
