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perf_session.go
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perf_session.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 aggregate
import (
"context"
"fmt"
"time"
"github.com/apache/incubator-pegasus/go-client/admin"
"github.com/apache/incubator-pegasus/go-client/session"
"github.com/tidwall/gjson"
)
// PerfSession is a client to get perf-counters from a Pegasus ReplicaServer.
type PerfSession struct {
session.NodeSession
Address string
}
// PerfCounter is a Pegasus perf-counter.
type PerfCounter struct {
Name string
Value float64
}
func (p *PerfCounter) String() string {
return fmt.Sprintf("{Name: %s, Value: %f}", p.Name, p.Value)
}
// NewPerfSession returns an instance of PerfSession.
func NewPerfSession(addr string) *PerfSession {
return &PerfSession{
Address: addr,
NodeSession: session.NewNodeSession(addr, session.NodeTypeReplica),
}
}
// WrapPerf returns an instance of PerfSession using an existed session.
func WrapPerf(addr string, session session.NodeSession) *PerfSession {
return &PerfSession{
Address: addr,
NodeSession: session,
}
}
// GetPerfCounters retrieves all perf-counters matched with `filter` from the remote node.
func (c *PerfSession) GetPerfCounters(filter string) ([]*PerfCounter, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
rc := &admin.RemoteCommand{
Command: "perf-counters-by-substr",
Arguments: []string{filter},
}
result, err := rc.Call(ctx, c.NodeSession)
if err != nil {
return nil, err
}
resultJSON := gjson.Parse(result)
perfCounters := resultJSON.Get("counters").Array()
var ret []*PerfCounter
for _, perfCounter := range perfCounters {
ret = append(ret, &PerfCounter{
Name: perfCounter.Get("name").String(),
Value: perfCounter.Get("value").Float(),
})
}
return ret, nil
}
// Close terminates the session to replica.
func (c *PerfSession) Close() {
c.NodeSession.Close()
}