fix(consul): unable to recreate after canceled the consul watch

[harbourlga]

Description (what this PR does / why we need it):

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for the reviewers:

[harbourlga]

When the idle mode ends, watch again does not continue to obtain the instance list of the service through consul.

[shenqidebaozi]

Can it be fixed when multiple clients are created for the same service? For example, if a client is idle, will b client also be unable to update the instance due to Watcher shutdown?

kratos/contrib/registry/consul/watcher.go

Line 34 in 0cb74ea

func (w *watcher) Stop() error {

[harbourlga]

Can it be fixed when multiple clients are created for the same service? For example, if a client is idle, will b client also be unable to update the instance due to Watcher shutdown?

kratos/contrib/registry/consul/watcher.go

Line 34 in 0cb74ea

func (w *watcher) Stop() error {

If you are talking about multiple grpc clients, then each client will build a different resolver to watch name resolution updates. Each resolver has its own context to control the shutdown of the Watcher. Therefore, when client a becomes idle, client b will not close the watcher.

When creating the grpc client, a resolver will be built:
https://github.com/grpc/grpc-go/blob/02858ee5064040458f7e3e04e10765a62814c50b/resolver_wrapper.go#L80

kratos/transport/grpc/resolver/discovery/builder.go

Line 86 in 0cb74ea

ctx, cancel := context.WithCancel(context.Background())

kratos/transport/grpc/resolver/discovery/builder.go

Line 88 in 0cb74ea

w, err := b.discoverer.Watch(ctx, strings.TrimPrefix(target.URL.Path, "/"))

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.72%. Comparing base (9106991) to head (658b5af).
Report is 15 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3162      +/-   ##
==========================================
+ Coverage   84.62%   84.72%   +0.10%     
==========================================
  Files          88       88              
  Lines        3993     3993              
==========================================
+ Hits         3379     3383       +4     
+ Misses        440      438       -2     
+ Partials      174      172       -2     

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