115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// +build !appengine
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/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package syscall provides functionalities that grpc uses to get low-level operating system
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// stats/info.
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package syscall
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import (
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"fmt"
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"net"
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"syscall"
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"time"
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"golang.org/x/sys/unix"
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"google.golang.org/grpc/grpclog"
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)
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// GetCPUTime returns the how much CPU time has passed since the start of this process.
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func GetCPUTime() int64 {
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var ts unix.Timespec
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if err := unix.ClockGettime(unix.CLOCK_PROCESS_CPUTIME_ID, &ts); err != nil {
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grpclog.Fatal(err)
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}
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return ts.Nano()
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}
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// Rusage is an alias for syscall.Rusage under linux non-appengine environment.
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type Rusage syscall.Rusage
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// GetRusage returns the resource usage of current process.
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func GetRusage() (rusage *Rusage) {
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rusage = new(Rusage)
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syscall.Getrusage(syscall.RUSAGE_SELF, (*syscall.Rusage)(rusage))
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return
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}
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// CPUTimeDiff returns the differences of user CPU time and system CPU time used
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// between two Rusage structs.
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func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) {
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f := (*syscall.Rusage)(first)
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l := (*syscall.Rusage)(latest)
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var (
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utimeDiffs = l.Utime.Sec - f.Utime.Sec
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utimeDiffus = l.Utime.Usec - f.Utime.Usec
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stimeDiffs = l.Stime.Sec - f.Stime.Sec
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stimeDiffus = l.Stime.Usec - f.Stime.Usec
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)
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uTimeElapsed := float64(utimeDiffs) + float64(utimeDiffus)*1.0e-6
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sTimeElapsed := float64(stimeDiffs) + float64(stimeDiffus)*1.0e-6
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return uTimeElapsed, sTimeElapsed
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}
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// SetTCPUserTimeout sets the TCP user timeout on a connection's socket
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func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error {
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tcpconn, ok := conn.(*net.TCPConn)
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if !ok {
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// not a TCP connection. exit early
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return nil
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}
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rawConn, err := tcpconn.SyscallConn()
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if err != nil {
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return fmt.Errorf("error getting raw connection: %v", err)
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}
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err = rawConn.Control(func(fd uintptr) {
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err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(timeout/time.Millisecond))
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})
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if err != nil {
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return fmt.Errorf("error setting option on socket: %v", err)
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}
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return nil
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}
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// GetTCPUserTimeout gets the TCP user timeout on a connection's socket
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func GetTCPUserTimeout(conn net.Conn) (opt int, err error) {
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tcpconn, ok := conn.(*net.TCPConn)
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if !ok {
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err = fmt.Errorf("conn is not *net.TCPConn. got %T", conn)
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return
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}
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rawConn, err := tcpconn.SyscallConn()
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if err != nil {
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err = fmt.Errorf("error getting raw connection: %v", err)
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return
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}
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err = rawConn.Control(func(fd uintptr) {
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opt, err = syscall.GetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT)
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})
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if err != nil {
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err = fmt.Errorf("error getting option on socket: %v", err)
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return
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}
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return
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}
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