func (h *HTTPCommunicator) postJSON(path string, data interface{}) (
	resp *http.Response, retryFail bool, err error) {
	retriablePost := util.RetriableFunc(
		func() error {
			resp, err = h.tryPostJSON(path, data)
			if err == nil && resp.StatusCode == http.StatusOK {
				return nil
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				h.Logger.Logf(slogger.ERROR, "received 409 conflict error")
				return HTTPConflictError
			}
			if err != nil {
				h.Logger.Logf(slogger.ERROR, "HTTP Post failed on '%v': %v",
					path, err)
				return util.RetriableError{err}
			} else {
				h.Logger.Logf(slogger.ERROR, "bad response '%v' posting to "+
					"'%v'", resp.StatusCode, path)
				return util.RetriableError{fmt.Errorf("unexpected status "+
					"code: %v", resp.StatusCode)}
			}
		},
	)
	retryFail, err = util.Retry(retriablePost, h.MaxAttempts, h.RetrySleep)
	return resp, retryFail, err
}

// GetProjectConfig loads the communicator's task's project from the API server.
func (h *HTTPCommunicator) GetProjectRef() (*model.ProjectRef, error) {
	projectRef := &model.ProjectRef{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.tryGet("project_ref")
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				// Something very wrong, fail now with no retry.
				return fmt.Errorf("conflict - wrong secret!")
			}
			if err != nil {
				// Some generic error trying to connect - try again
				return util.RetriableError{err}
			}
			if resp == nil {
				return util.RetriableError{fmt.Errorf("empty response")}
			} else {
				err = util.ReadJSONInto(resp.Body, projectRef)
				if err != nil {
					return util.RetriableError{err}
				}
				return nil
			}
		},
	)

	retryFail, err := util.Retry(retriableGet, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return nil, fmt.Errorf("getting project ref failed after %v tries: %v", h.MaxAttempts, err)
	}
	return projectRef, nil
}

// tryGithubPost posts the data to the Github api endpoint with the url given
func tryGithubPost(url string, oauthToken string, data interface{}) (resp *http.Response, err error) {
	evergreen.Logger.Logf(slogger.ERROR, "Attempting GitHub API POST at ‘%v’", url)
	retriableGet := util.RetriableFunc(
		func() (retryError error) {
			resp, err = githubRequest("POST", url, oauthToken, data)
			if err != nil {
				evergreen.Logger.Logf(slogger.ERROR, "failed trying to call github POST on %v: %v", url, err)
				return util.RetriableError{err}
			}
			if resp.StatusCode == http.StatusUnauthorized {
				err = fmt.Errorf("Calling github POST on %v failed: got 'unauthorized' response", url)
				evergreen.Logger.Logf(slogger.ERROR, err.Error())
				return err
			}
			if resp.StatusCode != http.StatusOK {
				err = fmt.Errorf("Calling github POST on %v got a bad response code: %v", url, resp.StatusCode)
			}
			// read the results
			rateMessage, loglevel := getGithubRateLimit(resp.Header)
			evergreen.Logger.Logf(loglevel, "Github API response: %v. %v", resp.Status, rateMessage)
			return nil
		},
	)

	retryFail, err := util.Retry(retriableGet, NumGithubRetries, GithubSleepTimeSecs*time.Second)
	if err != nil {
		// couldn't post it
		if retryFail {
			evergreen.Logger.Logf(slogger.ERROR, "Github POST on %v used up all retries.")
		}
		return nil, err
	}

	return
}

func tryGithubGet(oauthToken, url string) (resp *http.Response, err error) {
	evergreen.Logger.Logf(slogger.INFO, "Attempting GitHub API call at ‘%v’", url)
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err = githubRequest("GET", url, oauthToken, nil)
			if err != nil {
				evergreen.Logger.Logf(slogger.ERROR, "failed trying to call github GET on %v: %v", url, err)
				return util.RetriableError{err}
			}
			if resp.StatusCode == http.StatusUnauthorized {
				err = fmt.Errorf("Calling github GET on %v failed: got 'unauthorized' response", url)
				evergreen.Logger.Logf(slogger.ERROR, err.Error())
				return err
			}
			if resp.StatusCode != http.StatusOK {
				err = fmt.Errorf("Calling github GET on %v got a bad response code: %v", url, resp.StatusCode)
			}
			// read the results
			rateMessage, _ := getGithubRateLimit(resp.Header)
			evergreen.Logger.Logf(slogger.DEBUG, "Github API repsonse: %v. %v", resp.Status, rateMessage)
			return nil
		},
	)

	retryFail, err := util.Retry(retriableGet, NumGithubRetries, GithubSleepTimeSecs*time.Second)
	if err != nil {
		// couldn't get it
		if retryFail {
			evergreen.Logger.Logf(slogger.ERROR, "Github GET on %v used up all retries.", err)
		}
		return nil, err
	}

	return
}

// Log sends a batch of log messages for the task's logs to the API server.
func (h *HTTPCommunicator) Log(messages []model.LogMessage) error {
	outgoingData := model.TaskLog{
		TaskId:       h.TaskId,
		Timestamp:    time.Now(),
		MessageCount: len(messages),
		Messages:     messages,
	}

	retriableLog := util.RetriableFunc(
		func() error {
			resp, err := h.TryPostJSON("log", outgoingData)
			if resp != nil {
				defer resp.Body.Close()
			}
			if err != nil {
				return util.RetriableError{err}
			}
			if resp.StatusCode == http.StatusInternalServerError {
				return util.RetriableError{fmt.Errorf("http status %v response body %v", resp.StatusCode, resp.Body)}
			}
			return nil
		},
	)
	retryFail, err := util.Retry(retriableLog, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return fmt.Errorf("logging failed after %vtries: %v",
			h.MaxAttempts, err)
	}
	return err
}

func (jsc *JSONSendCommand) Execute(log plugin.Logger, com plugin.PluginCommunicator, conf *model.TaskConfig, stop chan bool) error {
	if jsc.File == "" {
		return fmt.Errorf("'file' param must not be blank")
	}
	if jsc.DataName == "" {
		return fmt.Errorf("'name' param must not be blank")
	}

	errChan := make(chan error)
	go func() {
		// attempt to open the file
		fileLoc := filepath.Join(conf.WorkDir, jsc.File)
		jsonFile, err := os.Open(fileLoc)
		if err != nil {
			errChan <- fmt.Errorf("Couldn't open json file: '%v'", err)
			return
		}

		jsonData := map[string]interface{}{}
		err = util.ReadJSONInto(jsonFile, &jsonData)
		if err != nil {
			errChan <- fmt.Errorf("File contained invalid json: %v", err)
			return
		}

		retriablePost := util.RetriableFunc(
			func() error {
				log.LogTask(slogger.INFO, "Posting JSON")
				resp, err := com.TaskPostJSON(fmt.Sprintf("data/%v", jsc.DataName), jsonData)
				if resp != nil {
					defer resp.Body.Close()
				}
				if err != nil {
					return util.RetriableError{err}
				}
				if resp.StatusCode != http.StatusOK {
					return util.RetriableError{fmt.Errorf("unexpected status code %v", resp.StatusCode)}
				}
				return nil
			},
		)

		_, err = util.Retry(retriablePost, 10, 3*time.Second)
		errChan <- err
	}()

	select {
	case err := <-errChan:
		if err != nil {
			log.LogTask(slogger.ERROR, "Sending json data failed: %v", err)
		}
		return err
	case <-stop:
		log.LogExecution(slogger.INFO, "Received abort signal, stopping.")
		return nil
	}
}

// FetchExpansionVars loads expansions for a communicator's task from the API server.
func (h *HTTPCommunicator) FetchExpansionVars() (*apimodels.ExpansionVars, error) {
	resultVars := &apimodels.ExpansionVars{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.tryGet("fetch_vars")
			if resp != nil {
				defer resp.Body.Close()
			}
			if err != nil {
				// Some generic error trying to connect - try again
				h.Logger.Logf(slogger.ERROR, "failed trying to call fetch GET: %v", err)
				return util.RetriableError{err}
			}
			if resp.StatusCode == http.StatusUnauthorized {
				err = fmt.Errorf("fetching expansions failed: got 'unauthorized' response.")
				h.Logger.Logf(slogger.ERROR, err.Error())
				return err
			}
			if resp.StatusCode != http.StatusOK {
				err = fmt.Errorf("failed trying fetch GET, got bad response code: %v", resp.StatusCode)
				h.Logger.Logf(slogger.ERROR, err.Error())
				return util.RetriableError{err}
			}
			if resp == nil {
				err = fmt.Errorf("empty response fetching expansions")
				h.Logger.Logf(slogger.ERROR, err.Error())
				return util.RetriableError{err}
			}

			// got here safely, so all is good - read the results
			err = util.ReadJSONInto(resp.Body, resultVars)
			if err != nil {
				err = fmt.Errorf("failed to read vars from response: %v", err)
				h.Logger.Logf(slogger.ERROR, err.Error())
				return err
			}
			return nil
		},
	)

	retryFail, err := util.Retry(retriableGet, 10, 1*time.Second)
	if err != nil {
		// stop trying to make fetch happen, it's not going to happen
		if retryFail {
			h.Logger.Logf(slogger.ERROR, "Fetching vars used up all retries.")
		}
		return nil, err
	}
	return resultVars, err
}

// GetProjectConfig loads the communicator's task's project from the API server.
func (h *HTTPCommunicator) GetProjectConfig() (*model.Project, error) {
	projectConfig := &model.Project{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.tryGet("version")
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				// Something very wrong, fail now with no retry.
				return fmt.Errorf("conflict - wrong secret!")
			}
			if err != nil {
				// Some generic error trying to connect - try again
				return util.RetriableError{err}
			}
			if resp == nil {
				return util.RetriableError{fmt.Errorf("empty response")}
			} else {
				v := &version.Version{}
				err = util.ReadJSONInto(resp.Body, v)
				if err != nil {
					h.Logger.Errorf(slogger.ERROR,
						"unable to read project version response: %v\n", err)
					return util.RetriableError{fmt.Errorf("unable to read "+
						"project version response: %v\n", err)}
				}
				err = model.LoadProjectInto([]byte(v.Config), v.Project, projectConfig)
				if err != nil {
					h.Logger.Errorf(slogger.ERROR,
						"unable to unmarshal project config: %v\n", err)
					return util.RetriableError{fmt.Errorf("unable to "+
						"unmarshall project config: %v\n", err)}
				}
				return nil
			}
		},
	)

	retryFail, err := util.Retry(retriableGet, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return nil, fmt.Errorf("getting project configuration failed after %v "+
			"tries: %v", h.MaxAttempts, err)
	}
	return projectConfig, nil
}

// GetVersion loads the communicator's task's version from the API server.
func (h *HTTPCommunicator) GetVersion() (*version.Version, error) {
	v := &version.Version{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.TryGet("version")
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil {
				if resp.StatusCode == http.StatusConflict {
					// Something very wrong, fail now with no retry.
					return fmt.Errorf("conflict - wrong secret!")
				}
				if resp.StatusCode != http.StatusOK {
					msg, _ := ioutil.ReadAll(resp.Body) // ignore ReadAll error
					return util.RetriableError{
						fmt.Errorf("bad status code %v: %v", resp.StatusCode, string(msg)),
					}
				}
			}
			if err != nil {
				// Some generic error trying to connect - try again
				return util.RetriableError{err}
			}
			if resp == nil {
				return util.RetriableError{fmt.Errorf("empty response")}
			} else {
				err = util.ReadJSONInto(resp.Body, v)
				if err != nil {
					h.Logger.Errorf(slogger.ERROR,
						"unable to read project version response: %v\n", err)
					return fmt.Errorf("unable to read project version response: %v\n", err)
				}
				return nil
			}
		},
	)

	retryFail, err := util.Retry(retriableGet, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return nil, fmt.Errorf("getting project configuration failed after %v "+
			"tries: %v", h.MaxAttempts, err)
	}
	return v, nil
}

// GetDistro returns the distro for the communicator's task.
func (h *HTTPCommunicator) GetDistro() (*distro.Distro, error) {
	d := &distro.Distro{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.tryGet("distro")
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				// Something very wrong, fail now with no retry.
				return fmt.Errorf("conflict - wrong secret!")
			}
			if err != nil {
				// Some generic error trying to connect - try again
				return util.RetriableError{err}
			}
			if resp == nil {
				return util.RetriableError{fmt.Errorf("empty response")}
			} else {
				err = util.ReadJSONInto(resp.Body, d)
				if err != nil {
					h.Logger.Errorf(slogger.ERROR,
						"unable to read distro response: %v\n", err)
					return util.RetriableError{err}
				}
				return nil
			}
		},
	)

	retryFail, err := util.Retry(retriableGet, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return nil, fmt.Errorf("getting distro failed after %v tries: %v", h.MaxAttempts, err)
	}
	return d, nil
}

// GetTask returns the communicator's task.
func (h *HTTPCommunicator) GetTask() (*task.Task, error) {
	task := &task.Task{}
	retriableGet := util.RetriableFunc(
		func() error {
			resp, err := h.tryGet("")
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				// Something very wrong, fail now with no retry.
				return fmt.Errorf("conflict - wrong secret!")
			}
			if err != nil {
				// Some generic error trying to connect - try again
				return util.RetriableError{err}
			}
			if resp == nil {
				return util.RetriableError{fmt.Errorf("empty response")}
			} else {
				err = util.ReadJSONInto(resp.Body, task)
				if err != nil {
					fmt.Printf("error3, retrying: %v\n", err)
					return util.RetriableError{err}
				}
				return nil
			}
		},
	)

	retryFail, err := util.Retry(retriableGet, h.MaxAttempts, h.RetrySleep)
	if retryFail {
		return nil, fmt.Errorf("getting task failed after %v tries: %v",
			h.MaxAttempts, err)
	}
	return task, nil
}

// SendJSONResults is responsible for sending the
// specified file to the API Server
func (self *AttachTaskFilesCommand) SendTaskFiles(taskConfig *model.TaskConfig,
	pluginLogger plugin.Logger, pluginCom plugin.PluginCommunicator) error {

	// log each file attachment
	for name, link := range self.Files {
		pluginLogger.LogTask(slogger.INFO,
			"Attaching file: %v -> %v", name, link)
	}

	retriableSendFile := util.RetriableFunc(
		func() error {
			resp, err := pluginCom.TaskPostJSON(
				AttachTaskFilesAPIEndpoint,
				self.Files.Array(),
			)
			if resp != nil {
				defer resp.Body.Close()
			}
			if resp != nil && resp.StatusCode == http.StatusConflict {
				body, _ := ioutil.ReadAll(resp.Body)
				msg := fmt.Sprintf(
					"secret conflict while posting task files: %v", string(body))
				pluginLogger.LogTask(slogger.ERROR, msg)
				return fmt.Errorf(msg)
			}
			if resp != nil && resp.StatusCode == http.StatusBadRequest {
				body, _ := ioutil.ReadAll(resp.Body)
				msg := fmt.Sprintf(
					"error posting task files (%v): %v", resp.StatusCode, string(body))
				pluginLogger.LogTask(slogger.ERROR, msg)
				return fmt.Errorf(msg)
			}
			if resp != nil && resp.StatusCode != http.StatusOK {
				body, _ := ioutil.ReadAll(resp.Body)
				msg := fmt.Sprintf("error posting task files (%v): %v",
					resp.StatusCode, string(body))
				pluginLogger.LogExecution(slogger.WARN, msg)
				return util.RetriableError{err}
			}
			if err != nil {
				msg := fmt.Sprintf("error posting files: %v", err)
				pluginLogger.LogExecution(slogger.WARN, msg)
				return util.RetriableError{fmt.Errorf(msg)}
			}
			return nil
		},
	)

	retryFail, err := util.Retry(retriableSendFile, AttachResultsPostRetries,
		AttachResultsRetrySleepSec)

	if retryFail {
		return fmt.Errorf("Attach files failed after %v tries: %v",
			AttachResultsPostRetries, err)
	}
	if err != nil {
		return fmt.Errorf("Attach files failed: %v", err)
	}

	pluginLogger.LogExecution(slogger.INFO, "API attach files call succeeded")
	return nil
}