Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/github.com/modern-go/concurrent/.gitignore b/vendor/github.com/modern-go/concurrent/.gitignore
new file mode 100644
index 0000000..3f2bc47
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/.gitignore
@@ -0,0 +1 @@
+/coverage.txt
diff --git a/vendor/github.com/modern-go/concurrent/.travis.yml b/vendor/github.com/modern-go/concurrent/.travis.yml
new file mode 100644
index 0000000..449e67c
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/.travis.yml
@@ -0,0 +1,14 @@
+language: go
+
+go:
+ - 1.8.x
+ - 1.x
+
+before_install:
+ - go get -t -v ./...
+
+script:
+ - ./test.sh
+
+after_success:
+ - bash <(curl -s https://codecov.io/bash)
diff --git a/vendor/github.com/modern-go/concurrent/LICENSE b/vendor/github.com/modern-go/concurrent/LICENSE
new file mode 100644
index 0000000..261eeb9
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/LICENSE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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diff --git a/vendor/github.com/modern-go/concurrent/README.md b/vendor/github.com/modern-go/concurrent/README.md
new file mode 100644
index 0000000..acab320
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/README.md
@@ -0,0 +1,49 @@
+# concurrent
+
+[](https://sourcegraph.com/github.com/modern-go/concurrent?badge)
+[](http://godoc.org/github.com/modern-go/concurrent)
+[](https://travis-ci.org/modern-go/concurrent)
+[](https://codecov.io/gh/modern-go/concurrent)
+[](https://goreportcard.com/report/github.com/modern-go/concurrent)
+[](https://raw.githubusercontent.com/modern-go/concurrent/master/LICENSE)
+
+* concurrent.Map: backport sync.Map for go below 1.9
+* concurrent.Executor: goroutine with explicit ownership and cancellable
+
+# concurrent.Map
+
+because sync.Map is only available in go 1.9, we can use concurrent.Map to make code portable
+
+```go
+m := concurrent.NewMap()
+m.Store("hello", "world")
+elem, found := m.Load("hello")
+// elem will be "world"
+// found will be true
+```
+
+# concurrent.Executor
+
+```go
+executor := concurrent.NewUnboundedExecutor()
+executor.Go(func(ctx context.Context) {
+ everyMillisecond := time.NewTicker(time.Millisecond)
+ for {
+ select {
+ case <-ctx.Done():
+ fmt.Println("goroutine exited")
+ return
+ case <-everyMillisecond.C:
+ // do something
+ }
+ }
+})
+time.Sleep(time.Second)
+executor.StopAndWaitForever()
+fmt.Println("executor stopped")
+```
+
+attach goroutine to executor instance, so that we can
+
+* cancel it by stop the executor with Stop/StopAndWait/StopAndWaitForever
+* handle panic by callback: the default behavior will no longer crash your application
\ No newline at end of file
diff --git a/vendor/github.com/modern-go/concurrent/executor.go b/vendor/github.com/modern-go/concurrent/executor.go
new file mode 100644
index 0000000..623dba1
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/executor.go
@@ -0,0 +1,14 @@
+package concurrent
+
+import "context"
+
+// Executor replace go keyword to start a new goroutine
+// the goroutine should cancel itself if the context passed in has been cancelled
+// the goroutine started by the executor, is owned by the executor
+// we can cancel all executors owned by the executor just by stop the executor itself
+// however Executor interface does not Stop method, the one starting and owning executor
+// should use the concrete type of executor, instead of this interface.
+type Executor interface {
+ // Go starts a new goroutine controlled by the context
+ Go(handler func(ctx context.Context))
+}
diff --git a/vendor/github.com/modern-go/concurrent/go_above_19.go b/vendor/github.com/modern-go/concurrent/go_above_19.go
new file mode 100644
index 0000000..aeabf8c
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/go_above_19.go
@@ -0,0 +1,15 @@
+//+build go1.9
+
+package concurrent
+
+import "sync"
+
+// Map is a wrapper for sync.Map introduced in go1.9
+type Map struct {
+ sync.Map
+}
+
+// NewMap creates a thread safe Map
+func NewMap() *Map {
+ return &Map{}
+}
diff --git a/vendor/github.com/modern-go/concurrent/go_below_19.go b/vendor/github.com/modern-go/concurrent/go_below_19.go
new file mode 100644
index 0000000..b9c8df7
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/go_below_19.go
@@ -0,0 +1,33 @@
+//+build !go1.9
+
+package concurrent
+
+import "sync"
+
+// Map implements a thread safe map for go version below 1.9 using mutex
+type Map struct {
+ lock sync.RWMutex
+ data map[interface{}]interface{}
+}
+
+// NewMap creates a thread safe map
+func NewMap() *Map {
+ return &Map{
+ data: make(map[interface{}]interface{}, 32),
+ }
+}
+
+// Load is same as sync.Map Load
+func (m *Map) Load(key interface{}) (elem interface{}, found bool) {
+ m.lock.RLock()
+ elem, found = m.data[key]
+ m.lock.RUnlock()
+ return
+}
+
+// Load is same as sync.Map Store
+func (m *Map) Store(key interface{}, elem interface{}) {
+ m.lock.Lock()
+ m.data[key] = elem
+ m.lock.Unlock()
+}
diff --git a/vendor/github.com/modern-go/concurrent/log.go b/vendor/github.com/modern-go/concurrent/log.go
new file mode 100644
index 0000000..9756fcc
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/log.go
@@ -0,0 +1,13 @@
+package concurrent
+
+import (
+ "os"
+ "log"
+ "io/ioutil"
+)
+
+// ErrorLogger is used to print out error, can be set to writer other than stderr
+var ErrorLogger = log.New(os.Stderr, "", 0)
+
+// InfoLogger is used to print informational message, default to off
+var InfoLogger = log.New(ioutil.Discard, "", 0)
\ No newline at end of file
diff --git a/vendor/github.com/modern-go/concurrent/test.sh b/vendor/github.com/modern-go/concurrent/test.sh
new file mode 100755
index 0000000..d1e6b2e
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/test.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+echo "" > coverage.txt
+
+for d in $(go list ./... | grep -v vendor); do
+ go test -coverprofile=profile.out -coverpkg=github.com/modern-go/concurrent $d
+ if [ -f profile.out ]; then
+ cat profile.out >> coverage.txt
+ rm profile.out
+ fi
+done
diff --git a/vendor/github.com/modern-go/concurrent/unbounded_executor.go b/vendor/github.com/modern-go/concurrent/unbounded_executor.go
new file mode 100644
index 0000000..05a77dc
--- /dev/null
+++ b/vendor/github.com/modern-go/concurrent/unbounded_executor.go
@@ -0,0 +1,119 @@
+package concurrent
+
+import (
+ "context"
+ "fmt"
+ "runtime"
+ "runtime/debug"
+ "sync"
+ "time"
+ "reflect"
+)
+
+// HandlePanic logs goroutine panic by default
+var HandlePanic = func(recovered interface{}, funcName string) {
+ ErrorLogger.Println(fmt.Sprintf("%s panic: %v", funcName, recovered))
+ ErrorLogger.Println(string(debug.Stack()))
+}
+
+// UnboundedExecutor is a executor without limits on counts of alive goroutines
+// it tracks the goroutine started by it, and can cancel them when shutdown
+type UnboundedExecutor struct {
+ ctx context.Context
+ cancel context.CancelFunc
+ activeGoroutinesMutex *sync.Mutex
+ activeGoroutines map[string]int
+ HandlePanic func(recovered interface{}, funcName string)
+}
+
+// GlobalUnboundedExecutor has the life cycle of the program itself
+// any goroutine want to be shutdown before main exit can be started from this executor
+// GlobalUnboundedExecutor expects the main function to call stop
+// it does not magically knows the main function exits
+var GlobalUnboundedExecutor = NewUnboundedExecutor()
+
+// NewUnboundedExecutor creates a new UnboundedExecutor,
+// UnboundedExecutor can not be created by &UnboundedExecutor{}
+// HandlePanic can be set with a callback to override global HandlePanic
+func NewUnboundedExecutor() *UnboundedExecutor {
+ ctx, cancel := context.WithCancel(context.TODO())
+ return &UnboundedExecutor{
+ ctx: ctx,
+ cancel: cancel,
+ activeGoroutinesMutex: &sync.Mutex{},
+ activeGoroutines: map[string]int{},
+ }
+}
+
+// Go starts a new goroutine and tracks its lifecycle.
+// Panic will be recovered and logged automatically, except for StopSignal
+func (executor *UnboundedExecutor) Go(handler func(ctx context.Context)) {
+ pc := reflect.ValueOf(handler).Pointer()
+ f := runtime.FuncForPC(pc)
+ funcName := f.Name()
+ file, line := f.FileLine(pc)
+ executor.activeGoroutinesMutex.Lock()
+ defer executor.activeGoroutinesMutex.Unlock()
+ startFrom := fmt.Sprintf("%s:%d", file, line)
+ executor.activeGoroutines[startFrom] += 1
+ go func() {
+ defer func() {
+ recovered := recover()
+ // if you want to quit a goroutine without trigger HandlePanic
+ // use runtime.Goexit() to quit
+ if recovered != nil {
+ if executor.HandlePanic == nil {
+ HandlePanic(recovered, funcName)
+ } else {
+ executor.HandlePanic(recovered, funcName)
+ }
+ }
+ executor.activeGoroutinesMutex.Lock()
+ executor.activeGoroutines[startFrom] -= 1
+ executor.activeGoroutinesMutex.Unlock()
+ }()
+ handler(executor.ctx)
+ }()
+}
+
+// Stop cancel all goroutines started by this executor without wait
+func (executor *UnboundedExecutor) Stop() {
+ executor.cancel()
+}
+
+// StopAndWaitForever cancel all goroutines started by this executor and
+// wait until all goroutines exited
+func (executor *UnboundedExecutor) StopAndWaitForever() {
+ executor.StopAndWait(context.Background())
+}
+
+// StopAndWait cancel all goroutines started by this executor and wait.
+// Wait can be cancelled by the context passed in.
+func (executor *UnboundedExecutor) StopAndWait(ctx context.Context) {
+ executor.cancel()
+ for {
+ oneHundredMilliseconds := time.NewTimer(time.Millisecond * 100)
+ select {
+ case <-oneHundredMilliseconds.C:
+ if executor.checkNoActiveGoroutines() {
+ return
+ }
+ case <-ctx.Done():
+ return
+ }
+ }
+}
+
+func (executor *UnboundedExecutor) checkNoActiveGoroutines() bool {
+ executor.activeGoroutinesMutex.Lock()
+ defer executor.activeGoroutinesMutex.Unlock()
+ for startFrom, count := range executor.activeGoroutines {
+ if count > 0 {
+ InfoLogger.Println("UnboundedExecutor is still waiting goroutines to quit",
+ "startFrom", startFrom,
+ "count", count)
+ return false
+ }
+ }
+ return true
+}