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feat(zfs-localpv): vendor packages for zfs-localpv

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Signed-off-by: Pawan <pawan@mayadata.io>
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Pawan 2019-09-12 12:31:03 +05:30 • committed by Kiran Mova
parent 8d81b8b9c6
commit 8a4ed4e7b8
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Apache License
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you may not use this file except in compliance with the License.
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distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package buffer
// RingGrowing is a growing ring buffer.
// Not thread safe.
type RingGrowing struct {
data []interface{}
n int // Size of Data
beg int // First available element
readable int // Number of data items available
}
// NewRingGrowing constructs a new RingGrowing instance with provided parameters.
func NewRingGrowing(initialSize int) *RingGrowing {
return &RingGrowing{
data: make([]interface{}, initialSize),
n: initialSize,
}
}
// ReadOne reads (consumes) first item from the buffer if it is available, otherwise returns false.
func (r *RingGrowing) ReadOne() (data interface{}, ok bool) {
if r.readable == 0 {
return nil, false
}
r.readable--
element := r.data[r.beg]
r.data[r.beg] = nil // Remove reference to the object to help GC
if r.beg == r.n-1 {
// Was the last element
r.beg = 0
} else {
r.beg++
}
return element, true
}
// WriteOne adds an item to the end of the buffer, growing it if it is full.
func (r *RingGrowing) WriteOne(data interface{}) {
if r.readable == r.n {
// Time to grow
newN := r.n * 2
newData := make([]interface{}, newN)
to := r.beg + r.readable
if to <= r.n {
copy(newData, r.data[r.beg:to])
} else {
copied := copy(newData, r.data[r.beg:])
copy(newData[copied:], r.data[:(to%r.n)])
}
r.beg = 0
r.data = newData
r.n = newN
}
r.data[(r.readable+r.beg)%r.n] = data
r.readable++
}

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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package exec provides an injectable interface and implementations for running commands.
package exec // import "k8s.io/utils/exec"

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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package exec
import (
"context"
"io"
osexec "os/exec"
"syscall"
"time"
)
// ErrExecutableNotFound is returned if the executable is not found.
var ErrExecutableNotFound = osexec.ErrNotFound
// Interface is an interface that presents a subset of the os/exec API. Use this
// when you want to inject fakeable/mockable exec behavior.
type Interface interface {
// Command returns a Cmd instance which can be used to run a single command.
// This follows the pattern of package os/exec.
Command(cmd string, args ...string) Cmd
// CommandContext returns a Cmd instance which can be used to run a single command.
//
// The provided context is used to kill the process if the context becomes done
// before the command completes on its own. For example, a timeout can be set in
// the context.
CommandContext(ctx context.Context, cmd string, args ...string) Cmd
// LookPath wraps os/exec.LookPath
LookPath(file string) (string, error)
}
// Cmd is an interface that presents an API that is very similar to Cmd from os/exec.
// As more functionality is needed, this can grow. Since Cmd is a struct, we will have
// to replace fields with get/set method pairs.
type Cmd interface {
// Run runs the command to the completion.
Run() error
// CombinedOutput runs the command and returns its combined standard output
// and standard error. This follows the pattern of package os/exec.
CombinedOutput() ([]byte, error)
// Output runs the command and returns standard output, but not standard err
Output() ([]byte, error)
SetDir(dir string)
SetStdin(in io.Reader)
SetStdout(out io.Writer)
SetStderr(out io.Writer)
SetEnv(env []string)
// StdoutPipe and StderrPipe for getting the process' Stdout and Stderr as
// Readers
StdoutPipe() (io.ReadCloser, error)
StderrPipe() (io.ReadCloser, error)
// Start and Wait are for running a process non-blocking
Start() error
Wait() error
// Stops the command by sending SIGTERM. It is not guaranteed the
// process will stop before this function returns. If the process is not
// responding, an internal timer function will send a SIGKILL to force
// terminate after 10 seconds.
Stop()
}
// ExitError is an interface that presents an API similar to os.ProcessState, which is
// what ExitError from os/exec is. This is designed to make testing a bit easier and
// probably loses some of the cross-platform properties of the underlying library.
type ExitError interface {
String() string
Error() string
Exited() bool
ExitStatus() int
}
// Implements Interface in terms of really exec()ing.
type executor struct{}
// New returns a new Interface which will os/exec to run commands.
func New() Interface {
return &executor{}
}
// Command is part of the Interface interface.
func (executor *executor) Command(cmd string, args ...string) Cmd {
return (*cmdWrapper)(osexec.Command(cmd, args...))
}
// CommandContext is part of the Interface interface.
func (executor *executor) CommandContext(ctx context.Context, cmd string, args ...string) Cmd {
return (*cmdWrapper)(osexec.CommandContext(ctx, cmd, args...))
}
// LookPath is part of the Interface interface
func (executor *executor) LookPath(file string) (string, error) {
return osexec.LookPath(file)
}
// Wraps exec.Cmd so we can capture errors.
type cmdWrapper osexec.Cmd
var _ Cmd = &cmdWrapper{}
func (cmd *cmdWrapper) SetDir(dir string) {
cmd.Dir = dir
}
func (cmd *cmdWrapper) SetStdin(in io.Reader) {
cmd.Stdin = in
}
func (cmd *cmdWrapper) SetStdout(out io.Writer) {
cmd.Stdout = out
}
func (cmd *cmdWrapper) SetStderr(out io.Writer) {
cmd.Stderr = out
}
func (cmd *cmdWrapper) SetEnv(env []string) {
cmd.Env = env
}
func (cmd *cmdWrapper) StdoutPipe() (io.ReadCloser, error) {
r, err := (*osexec.Cmd)(cmd).StdoutPipe()
return r, handleError(err)
}
func (cmd *cmdWrapper) StderrPipe() (io.ReadCloser, error) {
r, err := (*osexec.Cmd)(cmd).StderrPipe()
return r, handleError(err)
}
func (cmd *cmdWrapper) Start() error {
err := (*osexec.Cmd)(cmd).Start()
return handleError(err)
}
func (cmd *cmdWrapper) Wait() error {
err := (*osexec.Cmd)(cmd).Wait()
return handleError(err)
}
// Run is part of the Cmd interface.
func (cmd *cmdWrapper) Run() error {
err := (*osexec.Cmd)(cmd).Run()
return handleError(err)
}
// CombinedOutput is part of the Cmd interface.
func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
out, err := (*osexec.Cmd)(cmd).CombinedOutput()
return out, handleError(err)
}
func (cmd *cmdWrapper) Output() ([]byte, error) {
out, err := (*osexec.Cmd)(cmd).Output()
return out, handleError(err)
}
// Stop is part of the Cmd interface.
func (cmd *cmdWrapper) Stop() {
c := (*osexec.Cmd)(cmd)
if c.Process == nil {
return
}
c.Process.Signal(syscall.SIGTERM)
time.AfterFunc(10*time.Second, func() {
if !c.ProcessState.Exited() {
c.Process.Signal(syscall.SIGKILL)
}
})
}
func handleError(err error) error {
if err == nil {
return nil
}
switch e := err.(type) {
case *osexec.ExitError:
return &ExitErrorWrapper{e}
case *osexec.Error:
if e.Err == osexec.ErrNotFound {
return ErrExecutableNotFound
}
}
return err
}
// ExitErrorWrapper is an implementation of ExitError in terms of os/exec ExitError.
// Note: standard exec.ExitError is type *os.ProcessState, which already implements Exited().
type ExitErrorWrapper struct {
*osexec.ExitError
}
var _ ExitError = &ExitErrorWrapper{}
// ExitStatus is part of the ExitError interface.
func (eew ExitErrorWrapper) ExitStatus() int {
ws, ok := eew.Sys().(syscall.WaitStatus)
if !ok {
panic("can't call ExitStatus() on a non-WaitStatus exitErrorWrapper")
}
return ws.ExitStatus()
}
// CodeExitError is an implementation of ExitError consisting of an error object
// and an exit code (the upper bits of os.exec.ExitStatus).
type CodeExitError struct {
Err error
Code int
}
var _ ExitError = CodeExitError{}
func (e CodeExitError) Error() string {
return e.Err.Error()
}
func (e CodeExitError) String() string {
return e.Err.Error()
}
// Exited is to check if the process has finished
func (e CodeExitError) Exited() bool {
return true
}
// ExitStatus is for checking the error code
func (e CodeExitError) ExitStatus() int {
return e.Code
}

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Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

22
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Additional IP Rights Grant (Patents)
"This implementation" means the copyrightable works distributed by
Google as part of the Go project.
Google hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section)
patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of Go, where such license applies only to those patent
claims, both currently owned or controlled by Google and acquired in
the future, licensable by Google that are necessarily infringed by this
implementation of Go. This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation. If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this
implementation of Go constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for this implementation of Go
shall terminate as of the date such litigation is filed.

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vendor/k8s.io/utils/integer/integer.go generated vendored Normal file
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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package integer
// IntMax returns the maximum of the params
func IntMax(a, b int) int {
if b > a {
return b
}
return a
}
// IntMin returns the minimum of the params
func IntMin(a, b int) int {
if b < a {
return b
}
return a
}
// Int32Max returns the maximum of the params
func Int32Max(a, b int32) int32 {
if b > a {
return b
}
return a
}
// Int32Min returns the minimum of the params
func Int32Min(a, b int32) int32 {
if b < a {
return b
}
return a
}
// Int64Max returns the maximum of the params
func Int64Max(a, b int64) int64 {
if b > a {
return b
}
return a
}
// Int64Min returns the minimum of the params
func Int64Min(a, b int64) int64 {
if b < a {
return b
}
return a
}
// RoundToInt32 rounds floats into integer numbers.
func RoundToInt32(a float64) int32 {
if a < 0 {
return int32(a - 0.5)
}
return int32(a + 0.5)
}

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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package io
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
)
// ErrLimitReached means that the read limit is reached.
var ErrLimitReached = errors.New("the read limit is reached")
// ConsistentRead repeatedly reads a file until it gets the same content twice.
// This is useful when reading files in /proc that are larger than page size
// and kernel may modify them between individual read() syscalls.
func ConsistentRead(filename string, attempts int) ([]byte, error) {
return consistentReadSync(filename, attempts, nil)
}
// consistentReadSync is the main functionality of ConsistentRead but
// introduces a sync callback that can be used by the tests to mutate the file
// from which the test data is being read
func consistentReadSync(filename string, attempts int, sync func(int)) ([]byte, error) {
oldContent, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
for i := 0; i < attempts; i++ {
if sync != nil {
sync(i)
}
newContent, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
if bytes.Compare(oldContent, newContent) == 0 {
return newContent, nil
}
// Files are different, continue reading
oldContent = newContent
}
return nil, fmt.Errorf("could not get consistent content of %s after %d attempts", filename, attempts)
}
// ReadAtMost reads up to `limit` bytes from `r`, and reports an error
// when `limit` bytes are read.
func ReadAtMost(r io.Reader, limit int64) ([]byte, error) {
limitedReader := &io.LimitedReader{R: r, N: limit}
data, err := ioutil.ReadAll(limitedReader)
if err != nil {
return data, err
}
if limitedReader.N <= 0 {
return data, ErrLimitReached
}
return data, nil
}

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/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package keymutex
import (
"hash/fnv"
"runtime"
"sync"
)
// NewHashed returns a new instance of KeyMutex which hashes arbitrary keys to
// a fixed set of locks. `n` specifies number of locks, if n <= 0, we use
// number of cpus.
// Note that because it uses fixed set of locks, different keys may share same
// lock, so it's possible to wait on same lock.
func NewHashed(n int) KeyMutex {
if n <= 0 {
n = runtime.NumCPU()
}
return &hashedKeyMutex{
mutexes: make([]sync.Mutex, n),
}
}
type hashedKeyMutex struct {
mutexes []sync.Mutex
}
// Acquires a lock associated with the specified ID.
func (km *hashedKeyMutex) LockKey(id string) {
km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Lock()
}
// Releases the lock associated with the specified ID.
func (km *hashedKeyMutex) UnlockKey(id string) error {
km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Unlock()
return nil
}
func (km *hashedKeyMutex) hash(id string) uint32 {
h := fnv.New32a()
h.Write([]byte(id))
return h.Sum32()
}

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/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package keymutex
// KeyMutex is a thread-safe interface for acquiring locks on arbitrary strings.
type KeyMutex interface {
// Acquires a lock associated with the specified ID, creates the lock if one doesn't already exist.
LockKey(id string)
// Releases the lock associated with the specified ID.
// Returns an error if the specified ID doesn't exist.
UnlockKey(id string) error
}

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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package path
import (
"errors"
"os"
)
// LinkTreatment is the base type for constants used by Exists that indicate
// how symlinks are treated for existence checks.
type LinkTreatment int
const (
// CheckFollowSymlink follows the symlink and verifies that the target of
// the symlink exists.
CheckFollowSymlink LinkTreatment = iota
// CheckSymlinkOnly does not follow the symlink and verfies only that they
// symlink itself exists.
CheckSymlinkOnly
)
// ErrInvalidLinkTreatment indicates that the link treatment behavior requested
// is not a valid behavior.
var ErrInvalidLinkTreatment = errors.New("unknown link behavior")
// Exists checks if specified file, directory, or symlink exists. The behavior
// of the test depends on the linkBehaviour argument. See LinkTreatment for
// more details.
func Exists(linkBehavior LinkTreatment, filename string) (bool, error) {
var err error
if linkBehavior == CheckFollowSymlink {
_, err = os.Stat(filename)
} else if linkBehavior == CheckSymlinkOnly {
_, err = os.Lstat(filename)
} else {
return false, ErrInvalidLinkTreatment
}
if os.IsNotExist(err) {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
// ReadDirNoStat returns a string of files/directories contained
// in dirname without calling lstat on them.
func ReadDirNoStat(dirname string) ([]string, error) {
if dirname == "" {
dirname = "."
}
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
defer f.Close()
return f.Readdirnames(-1)
}

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Copyright (c) 2012 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

22
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Additional IP Rights Grant (Patents)
"This implementation" means the copyrightable works distributed by
Google as part of the Go project.
Google hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section)
patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of Go, where such license applies only to those patent
claims, both currently owned or controlled by Google and acquired in
the future, licensable by Google that are necessarily infringed by this
implementation of Go. This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation. If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this
implementation of Go constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for this implementation of Go
shall terminate as of the date such litigation is filed.

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/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package trace
import (
"bytes"
"fmt"
"math/rand"
"time"
"k8s.io/klog"
)
// Field is a key value pair that provides additional details about the trace.
type Field struct {
Key string
Value interface{}
}
func (f Field) format() string {
return fmt.Sprintf("%s:%v", f.Key, f.Value)
}
func writeFields(b *bytes.Buffer, l []Field) {
for i, f := range l {
b.WriteString(f.format())
if i < len(l)-1 {
b.WriteString(",")
}
}
}
type traceStep struct {
stepTime time.Time
msg string
fields []Field
}
// Trace keeps track of a set of "steps" and allows us to log a specific
// step if it took longer than its share of the total allowed time
type Trace struct {
name string
fields []Field
startTime time.Time
steps []traceStep
}
// New creates a Trace with the specified name. The name identifies the operation to be traced. The
// Fields add key value pairs to provide additional details about the trace, such as operation inputs.
func New(name string, fields ...Field) *Trace {
return &Trace{name: name, startTime: time.Now(), fields: fields}
}
// Step adds a new step with a specific message. Call this at the end of an execution step to record
// how long it took. The Fields add key value pairs to provide additional details about the trace
// step.
func (t *Trace) Step(msg string, fields ...Field) {
if t.steps == nil {
// traces almost always have less than 6 steps, do this to avoid more than a single allocation
t.steps = make([]traceStep, 0, 6)
}
t.steps = append(t.steps, traceStep{stepTime: time.Now(), msg: msg, fields: fields})
}
// Log is used to dump all the steps in the Trace
func (t *Trace) Log() {
// an explicit logging request should dump all the steps out at the higher level
t.logWithStepThreshold(0)
}
func (t *Trace) logWithStepThreshold(stepThreshold time.Duration) {
var buffer bytes.Buffer
tracenum := rand.Int31()
endTime := time.Now()
totalTime := endTime.Sub(t.startTime)
buffer.WriteString(fmt.Sprintf("Trace[%d]: %q ", tracenum, t.name))
if len(t.fields) > 0 {
writeFields(&buffer, t.fields)
buffer.WriteString(" ")
}
buffer.WriteString(fmt.Sprintf("(started: %v) (total time: %v):\n", t.startTime, totalTime))
lastStepTime := t.startTime
for _, step := range t.steps {
stepDuration := step.stepTime.Sub(lastStepTime)
if stepThreshold == 0 || stepDuration > stepThreshold || klog.V(4) {
buffer.WriteString(fmt.Sprintf("Trace[%d]: [%v] [%v] ", tracenum, step.stepTime.Sub(t.startTime), stepDuration))
buffer.WriteString(step.msg)
if len(step.fields) > 0 {
buffer.WriteString(" ")
writeFields(&buffer, step.fields)
}
buffer.WriteString("\n")
}
lastStepTime = step.stepTime
}
stepDuration := endTime.Sub(lastStepTime)
if stepThreshold == 0 || stepDuration > stepThreshold || klog.V(4) {
buffer.WriteString(fmt.Sprintf("Trace[%d]: [%v] [%v] END\n", tracenum, endTime.Sub(t.startTime), stepDuration))
}
klog.Info(buffer.String())
}
// LogIfLong is used to dump steps that took longer than its share
func (t *Trace) LogIfLong(threshold time.Duration) {
if time.Since(t.startTime) >= threshold {
// if any step took more than it's share of the total allowed time, it deserves a higher log level
stepThreshold := threshold / time.Duration(len(t.steps)+1)
t.logWithStepThreshold(stepThreshold)
}
}
// TotalTime can be used to figure out how long it took since the Trace was created
func (t *Trace) TotalTime() time.Duration {
return time.Since(t.startTime)
}