github.com/vantum/vantum@v0.0.0-20180815184342-fe37d5f7a990/metrics/metrics.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // Package metrics provides general system and process level metrics collection.
    18  package metrics
    19  
    20  import (
    21  	"os"
    22  	"runtime"
    23  	"strings"
    24  	"time"
    25  
    26  	"github.com/vantum/vantum/log"
    27  	"github.com/rcrowley/go-metrics"
    28  	"github.com/rcrowley/go-metrics/exp"
    29  )
    30  
    31  // MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
    32  const MetricsEnabledFlag = "metrics"
    33  const DashboardEnabledFlag = "dashboard"
    34  
    35  // Enabled is the flag specifying if metrics are enable or not.
    36  var Enabled = false
    37  
    38  // Init enables or disables the metrics system. Since we need this to run before
    39  // any other code gets to create meters and timers, we'll actually do an ugly hack
    40  // and peek into the command line args for the metrics flag.
    41  func init() {
    42  	for _, arg := range os.Args {
    43  		if flag := strings.TrimLeft(arg, "-"); flag == MetricsEnabledFlag || flag == DashboardEnabledFlag {
    44  			log.Info("Enabling metrics collection")
    45  			Enabled = true
    46  		}
    47  	}
    48  	exp.Exp(metrics.DefaultRegistry)
    49  }
    50  
    51  // NewCounter create a new metrics Counter, either a real one of a NOP stub depending
    52  // on the metrics flag.
    53  func NewCounter(name string) metrics.Counter {
    54  	if !Enabled {
    55  		return new(metrics.NilCounter)
    56  	}
    57  	return metrics.GetOrRegisterCounter(name, metrics.DefaultRegistry)
    58  }
    59  
    60  // NewMeter create a new metrics Meter, either a real one of a NOP stub depending
    61  // on the metrics flag.
    62  func NewMeter(name string) metrics.Meter {
    63  	if !Enabled {
    64  		return new(metrics.NilMeter)
    65  	}
    66  	return metrics.GetOrRegisterMeter(name, metrics.DefaultRegistry)
    67  }
    68  
    69  // NewTimer create a new metrics Timer, either a real one of a NOP stub depending
    70  // on the metrics flag.
    71  func NewTimer(name string) metrics.Timer {
    72  	if !Enabled {
    73  		return new(metrics.NilTimer)
    74  	}
    75  	return metrics.GetOrRegisterTimer(name, metrics.DefaultRegistry)
    76  }
    77  
    78  // CollectProcessMetrics periodically collects various metrics about the running
    79  // process.
    80  func CollectProcessMetrics(refresh time.Duration) {
    81  	// Short circuit if the metrics system is disabled
    82  	if !Enabled {
    83  		return
    84  	}
    85  	// Create the various data collectors
    86  	memstats := make([]*runtime.MemStats, 2)
    87  	diskstats := make([]*DiskStats, 2)
    88  	for i := 0; i < len(memstats); i++ {
    89  		memstats[i] = new(runtime.MemStats)
    90  		diskstats[i] = new(DiskStats)
    91  	}
    92  	// Define the various metrics to collect
    93  	memAllocs := metrics.GetOrRegisterMeter("system/memory/allocs", metrics.DefaultRegistry)
    94  	memFrees := metrics.GetOrRegisterMeter("system/memory/frees", metrics.DefaultRegistry)
    95  	memInuse := metrics.GetOrRegisterMeter("system/memory/inuse", metrics.DefaultRegistry)
    96  	memPauses := metrics.GetOrRegisterMeter("system/memory/pauses", metrics.DefaultRegistry)
    97  
    98  	var diskReads, diskReadBytes, diskWrites, diskWriteBytes metrics.Meter
    99  	if err := ReadDiskStats(diskstats[0]); err == nil {
   100  		diskReads = metrics.GetOrRegisterMeter("system/disk/readcount", metrics.DefaultRegistry)
   101  		diskReadBytes = metrics.GetOrRegisterMeter("system/disk/readdata", metrics.DefaultRegistry)
   102  		diskWrites = metrics.GetOrRegisterMeter("system/disk/writecount", metrics.DefaultRegistry)
   103  		diskWriteBytes = metrics.GetOrRegisterMeter("system/disk/writedata", metrics.DefaultRegistry)
   104  	} else {
   105  		log.Debug("Failed to read disk metrics", "err", err)
   106  	}
   107  	// Iterate loading the different stats and updating the meters
   108  	for i := 1; ; i++ {
   109  		runtime.ReadMemStats(memstats[i%2])
   110  		memAllocs.Mark(int64(memstats[i%2].Mallocs - memstats[(i-1)%2].Mallocs))
   111  		memFrees.Mark(int64(memstats[i%2].Frees - memstats[(i-1)%2].Frees))
   112  		memInuse.Mark(int64(memstats[i%2].Alloc - memstats[(i-1)%2].Alloc))
   113  		memPauses.Mark(int64(memstats[i%2].PauseTotalNs - memstats[(i-1)%2].PauseTotalNs))
   114  
   115  		if ReadDiskStats(diskstats[i%2]) == nil {
   116  			diskReads.Mark(diskstats[i%2].ReadCount - diskstats[(i-1)%2].ReadCount)
   117  			diskReadBytes.Mark(diskstats[i%2].ReadBytes - diskstats[(i-1)%2].ReadBytes)
   118  			diskWrites.Mark(diskstats[i%2].WriteCount - diskstats[(i-1)%2].WriteCount)
   119  			diskWriteBytes.Mark(diskstats[i%2].WriteBytes - diskstats[(i-1)%2].WriteBytes)
   120  		}
   121  		time.Sleep(refresh)
   122  	}
   123  }