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client.go
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client.go
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// Copyright 2017 Istio 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 platform
import (
"fmt"
"cloud.google.com/go/compute/metadata"
"google.golang.org/grpc"
)
// Client is the interface for implementing the client to access platform metadata.
type Client interface {
GetDialOptions() ([]grpc.DialOption, error)
// Whether the node agent is running on the right platform, e.g., if gcpPlatformImpl should only
// run on GCE.
IsProperPlatform() bool
// Get the service identity.
GetServiceIdentity() (string, error)
// Get node agent credential
GetAgentCredential() ([]byte, error)
// Get type of the credential
GetCredentialType() string
}
// NewClient is the function to create implementations of the platform metadata client.
func NewClient(platform, rootCertFile, keyFile, certChainFile, caAddr string) (Client, error) {
switch platform {
case "onprem":
return NewOnPremClientImpl(rootCertFile, keyFile, certChainFile)
case "gcp":
return NewGcpClientImpl(rootCertFile, caAddr), nil
case "aws":
return NewAwsClientImpl(rootCertFile), nil
case "unspecified":
if metadata.OnGCE() {
return NewGcpClientImpl(rootCertFile, caAddr), nil
}
return NewOnPremClientImpl(rootCertFile, keyFile, certChainFile)
default:
return nil, fmt.Errorf("invalid env %s specified", platform)
}
}