CRI Provider implementation (#195)

* First commit of CRI provider. Vendor deps not included

* First commit of CRI provider. Vendor deps not included

* Tidy up comments and format code

* vendor grpc, CRI APIs, update protobuf and tidy logging

* First commit of CRI provider. Vendor deps not included

* Tidy up comments and format code

* vendor grpc, CRI APIs, update protobuf and tidy logging

* Add README

* Fix errors in make test

vendor/google.golang.org/grpc/grpclb_util_test.go

@@ -0,0 +1,219 @@
+/*
+ *
+ * Copyright 2018 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 grpc
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/resolver"
+)
+
+type mockSubConn struct {
+	balancer.SubConn
+}
+
+type mockClientConn struct {
+	balancer.ClientConn
+
+	mu       sync.Mutex
+	subConns map[balancer.SubConn]resolver.Address
+}
+
+func newMockClientConn() *mockClientConn {
+	return &mockClientConn{
+		subConns: make(map[balancer.SubConn]resolver.Address),
+	}
+}
+
+func (mcc *mockClientConn) NewSubConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (balancer.SubConn, error) {
+	sc := &mockSubConn{}
+	mcc.mu.Lock()
+	defer mcc.mu.Unlock()
+	mcc.subConns[sc] = addrs[0]
+	return sc, nil
+}
+
+func (mcc *mockClientConn) RemoveSubConn(sc balancer.SubConn) {
+	mcc.mu.Lock()
+	defer mcc.mu.Unlock()
+	delete(mcc.subConns, sc)
+}
+
+const testCacheTimeout = 100 * time.Millisecond
+
+func checkMockCC(mcc *mockClientConn, scLen int) error {
+	mcc.mu.Lock()
+	defer mcc.mu.Unlock()
+	if len(mcc.subConns) != scLen {
+		return fmt.Errorf("mcc = %+v, want len(mcc.subConns) = %v", mcc.subConns, scLen)
+	}
+	return nil
+}
+
+func checkCacheCC(ccc *lbCacheClientConn, sccLen, sctaLen int) error {
+	ccc.mu.Lock()
+	defer ccc.mu.Unlock()
+	if len(ccc.subConnCache) != sccLen {
+		return fmt.Errorf("ccc = %+v, want len(ccc.subConnCache) = %v", ccc.subConnCache, sccLen)
+	}
+	if len(ccc.subConnToAddr) != sctaLen {
+		return fmt.Errorf("ccc = %+v, want len(ccc.subConnToAddr) = %v", ccc.subConnToAddr, sctaLen)
+	}
+	return nil
+}
+
+// Test that SubConn won't be immediately removed.
+func TestLBCacheClientConnExpire(t *testing.T) {
+	mcc := newMockClientConn()
+	if err := checkMockCC(mcc, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	ccc := newLBCacheClientConn(mcc)
+	ccc.timeout = testCacheTimeout
+	if err := checkCacheCC(ccc, 0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	sc, _ := ccc.NewSubConn([]resolver.Address{{Addr: "address1"}}, balancer.NewSubConnOptions{})
+	// One subconn in MockCC.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// No subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 0, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	ccc.RemoveSubConn(sc)
+	// One subconn in MockCC before timeout.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// One subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 1, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	// Should all become empty after timeout.
+	var err error
+	for i := 0; i < 2; i++ {
+		time.Sleep(testCacheTimeout)
+		err = checkMockCC(mcc, 0)
+		if err != nil {
+			continue
+		}
+		err = checkCacheCC(ccc, 0, 0)
+		if err != nil {
+			continue
+		}
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+// Test that NewSubConn with the same address of a SubConn being removed will
+// reuse the SubConn and cancel the removing.
+func TestLBCacheClientConnReuse(t *testing.T) {
+	mcc := newMockClientConn()
+	if err := checkMockCC(mcc, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	ccc := newLBCacheClientConn(mcc)
+	ccc.timeout = testCacheTimeout
+	if err := checkCacheCC(ccc, 0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	sc, _ := ccc.NewSubConn([]resolver.Address{{Addr: "address1"}}, balancer.NewSubConnOptions{})
+	// One subconn in MockCC.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// No subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 0, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	ccc.RemoveSubConn(sc)
+	// One subconn in MockCC before timeout.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// One subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 1, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	// Recreate the old subconn, this should cancel the deleting process.
+	sc, _ = ccc.NewSubConn([]resolver.Address{{Addr: "address1"}}, balancer.NewSubConnOptions{})
+	// One subconn in MockCC.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// No subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 0, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	var err error
+	// Should not become empty after 2*timeout.
+	time.Sleep(2 * testCacheTimeout)
+	err = checkMockCC(mcc, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = checkCacheCC(ccc, 0, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Call remove again, will delete after timeout.
+	ccc.RemoveSubConn(sc)
+	// One subconn in MockCC before timeout.
+	if err := checkMockCC(mcc, 1); err != nil {
+		t.Fatal(err)
+	}
+	// One subconn being deleted, and one in CacheCC.
+	if err := checkCacheCC(ccc, 1, 1); err != nil {
+		t.Fatal(err)
+	}
+
+	// Should all become empty after timeout.
+	for i := 0; i < 2; i++ {
+		time.Sleep(testCacheTimeout)
+		err = checkMockCC(mcc, 0)
+		if err != nil {
+			continue
+		}
+		err = checkCacheCC(ccc, 0, 0)
+		if err != nil {
+			continue
+		}
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+}