github.com/luckypickle/go-ethereum-vet@v1.14.2/metrics/metrics.go (about)

     1  // Go port of Coda Hale's Metrics library
     2  //
     3  // <https://github.com/rcrowley/go-metrics>
     4  //
     5  // Coda Hale's original work: <https://github.com/codahale/metrics>
     6  package metrics
     7  
     8  import (
     9  	"os"
    10  	"runtime"
    11  	"strings"
    12  	"time"
    13  
    14  	"github.com/luckypickle/go-ethereum-vet/log"
    15  )
    16  
    17  // Enabled is checked by the constructor functions for all of the
    18  // standard metrics.  If it is true, the metric returned is a stub.
    19  //
    20  // This global kill-switch helps quantify the observer effect and makes
    21  // for less cluttered pprof profiles.
    22  var Enabled bool = false
    23  
    24  // MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
    25  const MetricsEnabledFlag = "metrics"
    26  
    27  // Init enables or disables the metrics system. Since we need this to run before
    28  // any other code gets to create meters and timers, we'll actually do an ugly hack
    29  // and peek into the command line args for the metrics flag.
    30  func init() {
    31  	for _, arg := range os.Args {
    32  		if flag := strings.TrimLeft(arg, "-"); flag == MetricsEnabledFlag {
    33  			log.Info("Enabling metrics collection")
    34  			Enabled = true
    35  		}
    36  	}
    37  }
    38  
    39  // CollectProcessMetrics periodically collects various metrics about the running
    40  // process.
    41  func CollectProcessMetrics(refresh time.Duration) {
    42  	// Short circuit if the metrics system is disabled
    43  	if !Enabled {
    44  		return
    45  	}
    46  	// Create the various data collectors
    47  	memstats := make([]*runtime.MemStats, 2)
    48  	diskstats := make([]*DiskStats, 2)
    49  	for i := 0; i < len(memstats); i++ {
    50  		memstats[i] = new(runtime.MemStats)
    51  		diskstats[i] = new(DiskStats)
    52  	}
    53  	// Define the various metrics to collect
    54  	memAllocs := GetOrRegisterMeter("system/memory/allocs", DefaultRegistry)
    55  	memFrees := GetOrRegisterMeter("system/memory/frees", DefaultRegistry)
    56  	memInuse := GetOrRegisterMeter("system/memory/inuse", DefaultRegistry)
    57  	memPauses := GetOrRegisterMeter("system/memory/pauses", DefaultRegistry)
    58  
    59  	var diskReads, diskReadBytes, diskWrites, diskWriteBytes Meter
    60  	var diskReadBytesCounter, diskWriteBytesCounter Counter
    61  	if err := ReadDiskStats(diskstats[0]); err == nil {
    62  		diskReads = GetOrRegisterMeter("system/disk/readcount", DefaultRegistry)
    63  		diskReadBytes = GetOrRegisterMeter("system/disk/readdata", DefaultRegistry)
    64  		diskReadBytesCounter = GetOrRegisterCounter("system/disk/readbytes", DefaultRegistry)
    65  		diskWrites = GetOrRegisterMeter("system/disk/writecount", DefaultRegistry)
    66  		diskWriteBytes = GetOrRegisterMeter("system/disk/writedata", DefaultRegistry)
    67  		diskWriteBytesCounter = GetOrRegisterCounter("system/disk/writebytes", DefaultRegistry)
    68  	} else {
    69  		log.Debug("Failed to read disk metrics", "err", err)
    70  	}
    71  	// Iterate loading the different stats and updating the meters
    72  	for i := 1; ; i++ {
    73  		location1 := i % 2
    74  		location2 := (i - 1) % 2
    75  
    76  		runtime.ReadMemStats(memstats[location1])
    77  		memAllocs.Mark(int64(memstats[location1].Mallocs - memstats[location2].Mallocs))
    78  		memFrees.Mark(int64(memstats[location1].Frees - memstats[location2].Frees))
    79  		memInuse.Mark(int64(memstats[location1].Alloc - memstats[location2].Alloc))
    80  		memPauses.Mark(int64(memstats[location1].PauseTotalNs - memstats[location2].PauseTotalNs))
    81  
    82  		if ReadDiskStats(diskstats[location1]) == nil {
    83  			diskReads.Mark(diskstats[location1].ReadCount - diskstats[location2].ReadCount)
    84  			diskReadBytes.Mark(diskstats[location1].ReadBytes - diskstats[location2].ReadBytes)
    85  			diskWrites.Mark(diskstats[location1].WriteCount - diskstats[location2].WriteCount)
    86  			diskWriteBytes.Mark(diskstats[location1].WriteBytes - diskstats[location2].WriteBytes)
    87  
    88  			diskReadBytesCounter.Inc(diskstats[location1].ReadBytes - diskstats[location2].ReadBytes)
    89  			diskWriteBytesCounter.Inc(diskstats[location1].WriteBytes - diskstats[location2].WriteBytes)
    90  		}
    91  		time.Sleep(refresh)
    92  	}
    93  }