Upgrade to 0.12

1 files changed, 79 insertions, 0 deletions

diff --git a/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
new file mode 100644
index 0000000..57aea9f
--- /dev/null
+++ b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
@@ -0,0 +1,79 @@
+/*
+ *
+ * Copyright 2017 gRPC 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.
+ *
+ */
+
+// Package roundrobin defines a roundrobin balancer. Roundrobin balancer is
+// installed as one of the default balancers in gRPC, users don't need to
+// explicitly install this balancer.
+package roundrobin
+
+import (
+        "context"
+        "sync"
+
+        "google.golang.org/grpc/balancer"
+        "google.golang.org/grpc/balancer/base"
+        "google.golang.org/grpc/grpclog"
+        "google.golang.org/grpc/resolver"
+)
+
+// Name is the name of round_robin balancer.
+const Name = "round_robin"
+
+// newBuilder creates a new roundrobin balancer builder.
+func newBuilder() balancer.Builder {
+        return base.NewBalancerBuilderWithConfig(Name, &rrPickerBuilder{}, base.Config{HealthCheck: true})
+}
+
+func init() {
+        balancer.Register(newBuilder())
+}
+
+type rrPickerBuilder struct{}
+
+func (*rrPickerBuilder) Build(readySCs map[resolver.Address]balancer.SubConn) balancer.Picker {
+        grpclog.Infof("roundrobinPicker: newPicker called with readySCs: %v", readySCs)
+        var scs []balancer.SubConn
+        for _, sc := range readySCs {
+                scs = append(scs, sc)
+        }
+        return &rrPicker{
+                subConns: scs,
+        }
+}
+
+type rrPicker struct {
+        // subConns is the snapshot of the roundrobin balancer when this picker was
+        // created. The slice is immutable. Each Get() will do a round robin
+        // selection from it and return the selected SubConn.
+        subConns []balancer.SubConn
+
+        mu   sync.Mutex
+        next int
+}
+
+func (p *rrPicker) Pick(ctx context.Context, opts balancer.PickOptions) (balancer.SubConn, func(balancer.DoneInfo), error) {
+        if len(p.subConns) <= 0 {
+                return nil, nil, balancer.ErrNoSubConnAvailable
+        }
+
+        p.mu.Lock()
+        sc := p.subConns[p.next]
+        p.next = (p.next + 1) % len(p.subConns)
+        p.mu.Unlock()
+        return sc, nil, nil
+}