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process.go
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process.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package instrument
import (
"os"
"time"
"github.com/m3db/m3/src/x/process"
"github.com/uber-go/tally"
)
type processReporter struct {
baseReporter
metrics processMetrics
}
type processMetrics struct {
NumFDs tally.Gauge
NumFDErrors tally.Counter
pid int
}
func (r *processMetrics) report() {
numFDs, err := process.NumFDs(r.pid)
if err == nil {
r.NumFDs.Update(float64(numFDs))
} else {
r.NumFDErrors.Inc(1)
}
}
// NewProcessReporter returns a new reporter that reports process
// metrics, currently just the process file descriptor count.
func NewProcessReporter(
scope tally.Scope,
reportInterval time.Duration,
) Reporter {
r := new(processReporter)
r.init(reportInterval, r.metrics.report)
processScope := scope.SubScope("process")
r.metrics.NumFDs = processScope.Gauge("num-fds")
r.metrics.NumFDErrors = processScope.Counter("num-fd-errors")
r.metrics.pid = os.Getpid()
return r
}