[VOL-4442] grpc streaming connection monitoring
Change-Id: Id787e94cf28745d36e72f8ed2f5c316312714db4
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/xds.go b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
new file mode 100644
index 0000000..9bad03c
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
@@ -0,0 +1,97 @@
+/*
+ *
+ * Copyright 2020 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 envconfig
+
+import (
+ "os"
+ "strings"
+)
+
+const (
+ // XDSBootstrapFileNameEnv is the env variable to set bootstrap file name.
+ // Do not use this and read from env directly. Its value is read and kept in
+ // variable BootstrapFileName.
+ //
+ // When both bootstrap FileName and FileContent are set, FileName is used.
+ XDSBootstrapFileNameEnv = "GRPC_XDS_BOOTSTRAP"
+ // XDSBootstrapFileContentEnv is the env variable to set bootstrapp file
+ // content. Do not use this and read from env directly. Its value is read
+ // and kept in variable BootstrapFileName.
+ //
+ // When both bootstrap FileName and FileContent are set, FileName is used.
+ XDSBootstrapFileContentEnv = "GRPC_XDS_BOOTSTRAP_CONFIG"
+
+ ringHashSupportEnv = "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH"
+ clientSideSecuritySupportEnv = "GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT"
+ aggregateAndDNSSupportEnv = "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER"
+ rbacSupportEnv = "GRPC_XDS_EXPERIMENTAL_RBAC"
+ federationEnv = "GRPC_EXPERIMENTAL_XDS_FEDERATION"
+ rlsInXDSEnv = "GRPC_EXPERIMENTAL_XDS_RLS_LB"
+
+ c2pResolverTestOnlyTrafficDirectorURIEnv = "GRPC_TEST_ONLY_GOOGLE_C2P_RESOLVER_TRAFFIC_DIRECTOR_URI"
+)
+
+var (
+ // XDSBootstrapFileName holds the name of the file which contains xDS
+ // bootstrap configuration. Users can specify the location of the bootstrap
+ // file by setting the environment variable "GRPC_XDS_BOOTSTRAP".
+ //
+ // When both bootstrap FileName and FileContent are set, FileName is used.
+ XDSBootstrapFileName = os.Getenv(XDSBootstrapFileNameEnv)
+ // XDSBootstrapFileContent holds the content of the xDS bootstrap
+ // configuration. Users can specify the bootstrap config by setting the
+ // environment variable "GRPC_XDS_BOOTSTRAP_CONFIG".
+ //
+ // When both bootstrap FileName and FileContent are set, FileName is used.
+ XDSBootstrapFileContent = os.Getenv(XDSBootstrapFileContentEnv)
+ // XDSRingHash indicates whether ring hash support is enabled, which can be
+ // disabled by setting the environment variable
+ // "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH" to "false".
+ XDSRingHash = !strings.EqualFold(os.Getenv(ringHashSupportEnv), "false")
+ // XDSClientSideSecurity is used to control processing of security
+ // configuration on the client-side.
+ //
+ // Note that there is no env var protection for the server-side because we
+ // have a brand new API on the server-side and users explicitly need to use
+ // the new API to get security integration on the server.
+ XDSClientSideSecurity = !strings.EqualFold(os.Getenv(clientSideSecuritySupportEnv), "false")
+ // XDSAggregateAndDNS indicates whether processing of aggregated cluster
+ // and DNS cluster is enabled, which can be enabled by setting the
+ // environment variable
+ // "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER" to
+ // "true".
+ XDSAggregateAndDNS = strings.EqualFold(os.Getenv(aggregateAndDNSSupportEnv), "true")
+
+ // XDSRBAC indicates whether xDS configured RBAC HTTP Filter is enabled,
+ // which can be disabled by setting the environment variable
+ // "GRPC_XDS_EXPERIMENTAL_RBAC" to "false".
+ XDSRBAC = !strings.EqualFold(os.Getenv(rbacSupportEnv), "false")
+
+ // XDSFederation indicates whether federation support is enabled.
+ XDSFederation = strings.EqualFold(os.Getenv(federationEnv), "true")
+
+ // XDSRLS indicates whether processing of Cluster Specifier plugins and
+ // support for the RLS CLuster Specifier is enabled, which can be enabled by
+ // setting the environment variable "GRPC_EXPERIMENTAL_XDS_RLS_LB" to
+ // "true".
+ XDSRLS = strings.EqualFold(os.Getenv(rlsInXDSEnv), "true")
+
+ // C2PResolverTestOnlyTrafficDirectorURI is the TD URI for testing.
+ C2PResolverTestOnlyTrafficDirectorURI = os.Getenv(c2pResolverTestOnlyTrafficDirectorURIEnv)
+)