cloudfoundry-incubator/eirini

package stager

import (
    "context"
    "encoding/json"
    "net/url"

    "code.cloudfoundry.org/eirini/models/cf"
    "code.cloudfoundry.org/lager"
    "code.cloudfoundry.org/runtimeschema/cc_messages"
    "github.com/pkg/errors"
)

//counterfeiter:generate . CallbackClient

type CallbackClient interface {
    Post(ctx context.Context, url string, data interface{}) error
}

type CallbackStagingCompleter struct {
    logger         lager.Logger
    callbackClient CallbackClient
}

func NewCallbackStagingCompleter(logger lager.Logger, callbackClient CallbackClient) *CallbackStagingCompleter {
    return &CallbackStagingCompleter{
        logger:         logger,
        callbackClient: callbackClient,
    }
}

func (s *CallbackStagingCompleter) CompleteStaging(ctx context.Context, taskCompletedRequest cf.StagingCompletedRequest) error {
    l := s.logger.Session("complete-staging", lager.Data{"task-guid": taskCompletedRequest.TaskGUID})

    callbackURI, err := s.getCallbackURI(taskCompletedRequest)
    if err != nil {
        l.Error("failed-to-parse-callback-uri", err)

        return err
    }

    _, err = url.Parse(callbackURI)
    if err != nil {
        l.Error("failed-to-parse-callback-request", err)
    }

    response := s.constructStagingResponse(taskCompletedRequest)

    return errors.Wrap(s.callbackClient.Post(ctx, callbackURI, response), "callback-response-unsuccessful")
}

func (s *CallbackStagingCompleter) constructStagingResponse(taskCompletedRequest cf.StagingCompletedRequest) cc_messages.StagingResponseForCC {
    var response cc_messages.StagingResponseForCC

    if taskCompletedRequest.Failed {
        response.Error = &cc_messages.StagingError{
            Id:      cc_messages.STAGING_ERROR,
            Message: taskCompletedRequest.FailureReason,
        }
    } else {
        result := json.RawMessage([]byte(taskCompletedRequest.Result))
        response.Result = &result
    }

    return response
}

func (s *CallbackStagingCompleter) getCallbackURI(taskCompletedRequest cf.StagingCompletedRequest) (string, error) {
    var annotation cc_messages.StagingTaskAnnotation
    if err := json.Unmarshal([]byte(taskCompletedRequest.Annotation), &annotation); err != nil {
        s.logger.Error("failed-to-parse-annotation", err)

        return "", errors.Wrap(err, "failed to parse annotation")
    }

    return annotation.CompletionCallback, nil
}