Scott Baker | 2d89798 | 2019-09-24 11:50:08 -0700 | [diff] [blame] | 1 | // +build !appengine |
| 2 | |
| 3 | /* |
| 4 | * |
| 5 | * Copyright 2018 gRPC authors. |
| 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | * you may not use this file except in compliance with the License. |
| 9 | * You may obtain a copy of the License at |
| 10 | * |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | * |
| 13 | * Unless required by applicable law or agreed to in writing, software |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | * See the License for the specific language governing permissions and |
| 17 | * limitations under the License. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | // Package syscall provides functionalities that grpc uses to get low-level operating system |
| 22 | // stats/info. |
| 23 | package syscall |
| 24 | |
| 25 | import ( |
| 26 | "fmt" |
| 27 | "net" |
| 28 | "syscall" |
| 29 | "time" |
| 30 | |
| 31 | "golang.org/x/sys/unix" |
| 32 | "google.golang.org/grpc/grpclog" |
| 33 | ) |
| 34 | |
| 35 | // GetCPUTime returns the how much CPU time has passed since the start of this process. |
| 36 | func GetCPUTime() int64 { |
| 37 | var ts unix.Timespec |
| 38 | if err := unix.ClockGettime(unix.CLOCK_PROCESS_CPUTIME_ID, &ts); err != nil { |
| 39 | grpclog.Fatal(err) |
| 40 | } |
| 41 | return ts.Nano() |
| 42 | } |
| 43 | |
| 44 | // Rusage is an alias for syscall.Rusage under linux non-appengine environment. |
| 45 | type Rusage syscall.Rusage |
| 46 | |
| 47 | // GetRusage returns the resource usage of current process. |
| 48 | func GetRusage() (rusage *Rusage) { |
| 49 | rusage = new(Rusage) |
| 50 | syscall.Getrusage(syscall.RUSAGE_SELF, (*syscall.Rusage)(rusage)) |
| 51 | return |
| 52 | } |
| 53 | |
| 54 | // CPUTimeDiff returns the differences of user CPU time and system CPU time used |
| 55 | // between two Rusage structs. |
| 56 | func CPUTimeDiff(first *Rusage, latest *Rusage) (float64, float64) { |
| 57 | f := (*syscall.Rusage)(first) |
| 58 | l := (*syscall.Rusage)(latest) |
| 59 | var ( |
| 60 | utimeDiffs = l.Utime.Sec - f.Utime.Sec |
| 61 | utimeDiffus = l.Utime.Usec - f.Utime.Usec |
| 62 | stimeDiffs = l.Stime.Sec - f.Stime.Sec |
| 63 | stimeDiffus = l.Stime.Usec - f.Stime.Usec |
| 64 | ) |
| 65 | |
| 66 | uTimeElapsed := float64(utimeDiffs) + float64(utimeDiffus)*1.0e-6 |
| 67 | sTimeElapsed := float64(stimeDiffs) + float64(stimeDiffus)*1.0e-6 |
| 68 | |
| 69 | return uTimeElapsed, sTimeElapsed |
| 70 | } |
| 71 | |
| 72 | // SetTCPUserTimeout sets the TCP user timeout on a connection's socket |
| 73 | func SetTCPUserTimeout(conn net.Conn, timeout time.Duration) error { |
| 74 | tcpconn, ok := conn.(*net.TCPConn) |
| 75 | if !ok { |
| 76 | // not a TCP connection. exit early |
| 77 | return nil |
| 78 | } |
| 79 | rawConn, err := tcpconn.SyscallConn() |
| 80 | if err != nil { |
| 81 | return fmt.Errorf("error getting raw connection: %v", err) |
| 82 | } |
| 83 | err = rawConn.Control(func(fd uintptr) { |
| 84 | err = syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int(timeout/time.Millisecond)) |
| 85 | }) |
| 86 | if err != nil { |
| 87 | return fmt.Errorf("error setting option on socket: %v", err) |
| 88 | } |
| 89 | |
| 90 | return nil |
| 91 | } |
| 92 | |
| 93 | // GetTCPUserTimeout gets the TCP user timeout on a connection's socket |
| 94 | func GetTCPUserTimeout(conn net.Conn) (opt int, err error) { |
| 95 | tcpconn, ok := conn.(*net.TCPConn) |
| 96 | if !ok { |
| 97 | err = fmt.Errorf("conn is not *net.TCPConn. got %T", conn) |
| 98 | return |
| 99 | } |
| 100 | rawConn, err := tcpconn.SyscallConn() |
| 101 | if err != nil { |
| 102 | err = fmt.Errorf("error getting raw connection: %v", err) |
| 103 | return |
| 104 | } |
| 105 | err = rawConn.Control(func(fd uintptr) { |
| 106 | opt, err = syscall.GetsockoptInt(int(fd), syscall.IPPROTO_TCP, unix.TCP_USER_TIMEOUT) |
| 107 | }) |
| 108 | if err != nil { |
| 109 | err = fmt.Errorf("error getting option on socket: %v", err) |
| 110 | return |
| 111 | } |
| 112 | |
| 113 | return |
| 114 | } |