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concurrency: clarify Observe semantics; only fetches subsequence

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This commit is contained in:
Anthony Romano 2017-04-21 16:19:43 -07:00
parent e6a789d541
commit c1300c81b3
1 changed files with 7 additions and 3 deletions
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10
clientv3/concurrency/election.go
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@ -148,9 +148,13 @@ func (e *Election) Leader(ctx context.Context) (*v3.GetResponse, error) {
return resp, nil return resp, nil
} }
// Observe returns a channel that observes all leader proposal values as // Observe returns a channel that reliably observes ordered leader proposals
// GetResponse values on the current leader key. The channel closes when // as GetResponse values on every current elected leader key. It will not
// the context is cancelled or the underlying watcher is otherwise disrupted. // necessarily fetch all historical leader updates, but will always post the
// most recent leader value.
//
// The channel closes when the context is canceled or the underlying watcher
// is otherwise disrupted.
func (e *Election) Observe(ctx context.Context) <-chan v3.GetResponse { func (e *Election) Observe(ctx context.Context) <-chan v3.GetResponse {
retc := make(chan v3.GetResponse) retc := make(chan v3.GetResponse)
go e.observe(ctx, retc) go e.observe(ctx, retc)