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- /*
- Copyright 2016 Google Inc. All Rights Reserved.
-
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- */
-
- package internal
-
- import (
- "testing"
- "time"
-
- "google.golang.org/grpc/naming"
- )
-
- func TestConnectionPool(t *testing.T) {
- addr := "127.0.0.1:123"
- ds := DialSettings{Endpoint: addr}
- pr := NewPoolResolver(4, &ds)
- watcher, err := pr.Resolve(addr)
- if err != nil {
- t.Fatalf("Resolve: %v", err)
- }
-
- updates, err := watcher.Next()
- if err != nil {
- t.Fatalf("Next: %v", err)
- }
- if len(updates) != 4 {
- t.Fatalf("Update count: %v", err)
- }
- metaSeen := make(map[interface{}]bool)
- for _, u := range updates {
- if u.Addr != addr {
- t.Errorf("Addr from update: wanted %v, got %v", addr, u.Addr)
- }
- // Metadata must be unique
- if metaSeen[u.Metadata] {
- t.Errorf("Wanted %v to be unique, got %v", u.Metadata, metaSeen)
- }
- metaSeen[u.Metadata] = true
- }
-
- // Test that Next blocks until Close and returns nil.
- nextc := make(chan []*naming.Update)
- go func() {
- next, err := watcher.Next()
- if err != nil {
- t.Errorf("Next: expected success, got %v", err)
- }
- nextc <- next
- }()
- time.Sleep(50 * time.Millisecond) // wait for watcher.Next goroutine
- select {
- case <-nextc:
- t.Fatal("next should not have been called yet")
- default:
- }
- watcher.Close()
- select {
- case next := <-nextc:
- if next != nil {
- t.Errorf("Next: expected nil, got %v", next)
- }
- case <-time.After(50 * time.Millisecond):
- t.Error("Next: did not return after 100ms")
- }
- }
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