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request.go
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/
request.go
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package cmd
import (
"fmt"
"os"
"sync"
"time"
"github.com/exoscale/egoscale"
"github.com/hashicorp/go-multierror"
"github.com/vbauerster/mpb/v4"
"github.com/vbauerster/mpb/v4/decor"
)
const (
parallelTask = 20
)
type task struct {
egoscale.Command
string
}
type taskStatus struct {
id int
jobStatus egoscale.JobStatusType
}
type taskResponse struct {
resp interface{}
error
}
func asyncTasks(tasks []task) []taskResponse {
// init results
responses := make([]taskResponse, len(tasks))
// create task Progress
taskBars := make([]*mpb.Bar, len(tasks))
maximum := 1 << 30
var taskWG sync.WaitGroup
progress := mpb.NewWithContext(gContext,
mpb.WithOutput(os.Stderr),
mpb.WithWaitGroup(&taskWG),
mpb.ContainerOptOn(mpb.WithOutput(nil), func() bool { return gQuiet }),
)
taskWG.Add(len(tasks))
var workerWG sync.WaitGroup
workerWG.Add(len(tasks))
workerSem := make(chan int, parallelTask)
max := 50 * time.Millisecond
// exec task and init bars
for i, task := range tasks {
c := make(chan taskStatus)
switch cmd := task.Command.(type) {
case egoscale.AsyncCommand:
go execTask(cmd, task.string, i, c, &responses[i], workerSem, &workerWG)
default:
go execSyncTask(task, i, c, &responses[i], workerSem, &workerWG)
}
taskBars[i] = progress.AddSpinner(int64(maximum),
mpb.SpinnerOnLeft,
mpb.PrependDecorators(
// simple name decorator
decor.Name(task.string),
),
mpb.AppendDecorators(decor.OnComplete(decor.Elapsed(decor.ET_STYLE_GO), "done")),
)
// listen for bar progress
go func(channel chan taskStatus, idx int) {
defer taskWG.Done()
defer close(channel)
start := time.Now()
// for select + sleep
for {
select {
case status := <-channel:
if status.jobStatus != egoscale.Pending {
taskBars[idx].IncrBy(maximum, time.Since(start))
return
}
case <-time.After(max):
// do nothing
}
taskBars[idx].IncrBy(1, time.Since(start))
}
}(c, i)
}
workerWG.Wait()
progress.Wait()
return responses
}
func execTask(task egoscale.AsyncCommand, message string, id int, c chan taskStatus, resp *taskResponse, sem chan int, wg *sync.WaitGroup) {
defer wg.Done()
sem <- 1
response := cs.Response(task)
var errorReq error
cs.AsyncRequestWithContext(gContext, task, func(jobResult *egoscale.AsyncJobResult, err error) bool {
if err != nil {
errorReq = err
return false
}
if jobResult.JobStatus != egoscale.Pending {
if errR := jobResult.Result(response); errR != nil {
errorReq = errR
}
return false
}
c <- taskStatus{id, egoscale.Pending}
return true
})
if errorReq == nil {
(*resp).resp = response
c <- taskStatus{id, egoscale.Success}
} else {
c <- taskStatus{id, egoscale.Failure}
(*resp).error = fmt.Errorf("failure %s: %s", message, errorReq)
}
<-sem
}
// filterErrors return all task with an error
func filterErrors(tasks []taskResponse) []error {
var r []error
for _, task := range tasks {
if task.error != nil {
r = append(r, task.error)
}
}
return r
}
func execSyncTask(task task, id int, c chan taskStatus, resp *taskResponse, sem chan int, wg *sync.WaitGroup) {
defer wg.Done()
sem <- 1
_, ok := cs.Response(task.Command).(*egoscale.BooleanResponse)
if ok {
if err := cs.BooleanRequestWithContext(gContext, task.Command); err != nil {
c <- taskStatus{id, egoscale.Failure}
(*resp).error = fmt.Errorf("failure %s: %s", task.string, err)
return
}
c <- taskStatus{id, egoscale.Success}
<-sem
return
}
result, err := cs.RequestWithContext(gContext, task.Command)
if err != nil {
c <- taskStatus{id, egoscale.Failure}
(*resp).error = fmt.Errorf("failure %s: %s", task.string, err)
return
}
(*resp).resp = result
c <- taskStatus{id, egoscale.Success}
<-sem
}
// asyncRequest if no response expected send nil
func asyncRequest(cmd egoscale.AsyncCommand, msg string) (interface{}, error) {
response := cs.Response(cmd)
if !gQuiet {
fmt.Fprint(os.Stderr, msg)
}
var errorReq error
cs.AsyncRequestWithContext(gContext, cmd, func(jobResult *egoscale.AsyncJobResult, err error) bool {
if !gQuiet {
fmt.Fprint(os.Stderr, ".")
}
if err != nil {
errorReq = err
return false
}
if jobResult.JobStatus == egoscale.Pending {
return true
}
if errR := jobResult.Result(response); errR != nil {
errorReq = errR
return false
}
if !gQuiet {
fmt.Fprintln(os.Stderr, " success")
}
return false
})
if errorReq != nil && !gQuiet {
fmt.Fprintln(os.Stderr, " failure")
}
return response, errorReq
}
// forEachZone executes the function f for each specified zone, and return a multierror.Error containing all
// errors that may have occurred during execution.
func forEachZone(zones []string, f func(zone string) error) error {
meg := new(multierror.Group)
for _, zone := range zones {
zone := zone
meg.Go(func() error {
return f(zone)
})
}
return meg.Wait().ErrorOrNil()
}