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store_gossiper.go
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store_gossiper.go
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// Copyright 2015 The Cockroach Authors.
//
// 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.
//
// Author: Matt Tracy (matt@cockroachlabs.com)
// Author: Bram Gruneir (bram+code@cockroachlabs.com)
package gossiputil
import (
"sync"
"testing"
"github.com/cockroachdb/cockroach/pkg/gossip"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/util/syncutil"
)
// StoreGossiper allows tests to push storeDescriptors into gossip and
// synchronize on their callbacks. There can only be one storeGossiper used per
// gossip instance.
type StoreGossiper struct {
g *gossip.Gossip
mu syncutil.Mutex
cond *sync.Cond
storeKeyMap map[string]struct{}
}
// NewStoreGossiper creates a store gossiper for use by tests. It adds the
// callback to gossip.
func NewStoreGossiper(g *gossip.Gossip) *StoreGossiper {
sg := &StoreGossiper{
g: g,
storeKeyMap: make(map[string]struct{}),
}
sg.cond = sync.NewCond(&sg.mu)
g.RegisterCallback(gossip.MakePrefixPattern(gossip.KeyStorePrefix), func(key string, _ roachpb.Value) {
sg.mu.Lock()
defer sg.mu.Unlock()
delete(sg.storeKeyMap, key)
sg.cond.Broadcast()
})
return sg
}
// GossipStores queues up a list of stores to gossip and blocks until each one
// is gossiped before returning.
func (sg *StoreGossiper) GossipStores(storeDescs []*roachpb.StoreDescriptor, t *testing.T) {
storeIDs := make([]roachpb.StoreID, len(storeDescs))
for i, store := range storeDescs {
storeIDs[i] = store.StoreID
}
sg.GossipWithFunction(storeIDs, func() {
for i, storeDesc := range storeDescs {
if err := sg.g.AddInfoProto(gossip.MakeStoreKey(storeIDs[i]), storeDesc, 0); err != nil {
t.Fatal(err)
}
}
})
}
// GossipWithFunction calls gossipFn and blocks until gossip callbacks have
// fired on each of the stores specified by storeIDs.
func (sg *StoreGossiper) GossipWithFunction(storeIDs []roachpb.StoreID, gossipFn func()) {
sg.mu.Lock()
defer sg.mu.Unlock()
sg.storeKeyMap = make(map[string]struct{})
for _, storeID := range storeIDs {
storeKey := gossip.MakeStoreKey(storeID)
sg.storeKeyMap[storeKey] = struct{}{}
}
gossipFn()
// Wait for gossip callbacks to be invoked on all the stores.
for len(sg.storeKeyMap) > 0 {
sg.cond.Wait()
}
}