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/
configdump.go
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/
configdump.go
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// Copyright 2018 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 configdump
import (
"encoding/json"
"fmt"
"io"
"github.com/gogo/protobuf/jsonpb"
"istio.io/istio/istioctl/pkg/util/configdump"
)
// ConfigWriter is a writer for processing responses from the Envoy Admin config_dump endpoint
type ConfigWriter struct {
Stdout io.Writer
configDump *configdump.Wrapper
}
// Prime loads the config dump into the writer ready for printing
func (c *ConfigWriter) Prime(b []byte) error {
cd := configdump.Wrapper{}
err := json.Unmarshal(b, &cd)
if err != nil {
return fmt.Errorf("error unmarshalling config dump response from Envoy: %v", err)
}
c.configDump = &cd
return nil
}
// PrintBootstrapDump prints just the bootstrap config dump to the ConfigWriter stdout
func (c *ConfigWriter) PrintBootstrapDump() error {
if c.configDump == nil {
return fmt.Errorf("config writer has not been primed")
}
bootstrapDump, err := c.configDump.GetBootstrapConfigDump()
if err != nil {
return err
}
jsonm := &jsonpb.Marshaler{Indent: " "}
if err := jsonm.Marshal(c.Stdout, bootstrapDump); err != nil {
return fmt.Errorf("unable to marshal bootstrap in Envoy config dump")
}
return nil
}