watchdog

Documentation

Overview

Package watchdog monitors the trace-agent resource usage.

Index

• func LogOnPanic(statsd statsd.ClientInterface)
• type CPUInfo
• type CurrentInfo
  • func NewCurrentInfo() *CurrentInfo
  • func (pi *CurrentInfo) CPU(now time.Time) (CPUInfo, error)
  • func (pi *CurrentInfo) Mem() MemInfo
• type Info
• type MemInfo

Functions

func LogOnPanic

func LogOnPanic(statsd statsd.ClientInterface)

LogOnPanic catches panics and logs them on the fly. It also flushes the log file, ensuring the message appears. Then it propagates the panic so that the program flow remains unchanged.

Types

type CPUInfo

type CPUInfo struct {
	// UserAvg is the average of the user CPU usage since last time
	// it was polled. 0 means "not used at all" and 1 means "1 CPU was
	// totally full for that period". So it might be greater than 1 if
	// the process is monopolizing several cores.
	UserAvg float64
}

CPUInfo contains basic CPU info

type CurrentInfo

type CurrentInfo struct {
	// contains filtered or unexported fields
}

CurrentInfo is used to query CPU and Mem info, it keeps data from the previous calls to calculate averages. It is not thread safe.

func NewCurrentInfo

func NewCurrentInfo() *CurrentInfo

NewCurrentInfo creates a new CurrentInfo referring to the current running program.

func (*CurrentInfo) CPU

func (pi *CurrentInfo) CPU(now time.Time) (CPUInfo, error)

CPU returns basic CPU info, or the previous valid CPU info and an error.

func (*CurrentInfo) Mem

func (pi *CurrentInfo) Mem() MemInfo

Mem returns basic memory info.

type Info

type Info struct {
	// CPU contains basic CPU info
	CPU CPUInfo
	// Mem contains basic Mem info
	Mem MemInfo
}

Info contains all the watchdog infos, to be published by expvar

type MemInfo

type MemInfo struct {
	// Alloc is the number of bytes allocated and not yet freed
	// as described in runtime.MemStats.Alloc
	Alloc uint64
}

MemInfo contains basic memory info