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task_client_request.go
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task_client_request.go
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package director
import (
"fmt"
"net/http"
"time"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
)
type TaskClientRequest struct {
clientRequest ClientRequest
taskReporter TaskReporter
taskCheckStepDuration time.Duration
}
func NewTaskClientRequest(
clientRequest ClientRequest,
taskReporter TaskReporter,
taskCheckStepDuration time.Duration,
) TaskClientRequest {
return TaskClientRequest{
clientRequest: clientRequest,
taskReporter: taskReporter,
taskCheckStepDuration: taskCheckStepDuration,
}
}
type taskShortResp struct {
ID int // 165
State string // e.g. "queued", "processing", "done", "error", "cancelled"
}
func (r taskShortResp) IsRunning() bool {
return r.State == "queued" || r.State == "processing" || r.State == "cancelling"
}
func (r taskShortResp) IsSuccessfullyDone() bool {
return r.State == "done"
}
func (r TaskClientRequest) GetResult(path string) (int, []byte, error) {
var taskResp taskShortResp
err := r.clientRequest.Get(path, &taskResp)
if err != nil {
return 0, nil, err
}
respBody, err := r.waitForResult(taskResp)
return taskResp.ID, respBody, err
}
func (r TaskClientRequest) PostResult(path string, payload []byte, f func(*http.Request)) ([]byte, error) {
var taskResp taskShortResp
err := r.clientRequest.Post(path, payload, f, &taskResp)
if err != nil {
return nil, err
}
return r.waitForResult(taskResp)
}
func (r TaskClientRequest) PutResult(path string, payload []byte, f func(*http.Request)) ([]byte, error) {
var taskResp taskShortResp
err := r.clientRequest.Put(path, payload, f, &taskResp)
if err != nil {
return nil, err
}
return r.waitForResult(taskResp)
}
func (r TaskClientRequest) DeleteResult(path string) ([]byte, error) {
var taskResp taskShortResp
err := r.clientRequest.Delete(path, &taskResp)
if err != nil {
return nil, err
}
return r.waitForResult(taskResp)
}
func (r TaskClientRequest) WaitForCompletion(id int, type_ string, taskReporter TaskReporter) error {
taskReporter.TaskStarted(id)
var taskResp taskShortResp
var outputOffset int
defer func() {
taskReporter.TaskFinished(id, taskResp.State)
}()
taskPath := fmt.Sprintf("/tasks/%d", id)
for {
err := r.clientRequest.Get(taskPath, &taskResp)
if err != nil {
return bosherr.WrapError(err, "Getting task state")
}
// retrieve output *after* getting state to make sure
// it's complete in case of task being finished
outputOffset, err = r.reportOutputChunk(taskResp.ID, outputOffset, type_, taskReporter)
if err != nil {
return bosherr.WrapError(err, "Getting task output")
}
if taskResp.IsRunning() {
time.Sleep(r.taskCheckStepDuration)
continue
}
if taskResp.IsSuccessfullyDone() {
return nil
}
msgFmt := "Expected task '%d' to succeed but state is '%s'"
return bosherr.Errorf(msgFmt, taskResp.ID, taskResp.State)
}
}
func (r TaskClientRequest) waitForResult(taskResp taskShortResp) ([]byte, error) {
err := r.WaitForCompletion(taskResp.ID, "event", r.taskReporter)
if err != nil {
return nil, err
}
resultPath := fmt.Sprintf("/tasks/%d/output?type=result", taskResp.ID)
respBody, _, err := r.clientRequest.RawGet(resultPath, nil, nil)
if err != nil {
return nil, err
}
return respBody, nil
}
type taskReporterWriter struct {
id int
totalLen int
taskReporter TaskReporter
}
var _ ShouldTrackDownload = &taskReporterWriter{}
func (w *taskReporterWriter) Write(buf []byte) (int, error) {
bufLen := len(buf)
if bufLen > 0 {
w.taskReporter.TaskOutputChunk(w.id, buf)
}
w.totalLen += bufLen
return bufLen, nil
}
func (w taskReporterWriter) ShouldTrackDownload() bool { return false }
func (r TaskClientRequest) reportOutputChunk(id, offset int, type_ string, taskReporter TaskReporter) (int, error) {
outputPath := fmt.Sprintf("/tasks/%d/output?type=%s", id, type_)
setHeaders := func(req *http.Request) {
req.Header.Add("Range", fmt.Sprintf("bytes=%d-", offset))
}
writer := &taskReporterWriter{id, 0, taskReporter}
_, resp, err := r.clientRequest.RawGet(outputPath, writer, setHeaders)
if err != nil {
if resp != nil && resp.StatusCode == http.StatusRequestedRangeNotSatisfiable {
return offset, nil
}
return 0, err
}
return offset + writer.totalLen, nil
}