package client import ( "bytes" "encoding/json" "fmt" "io" "io/ioutil" "net/http" "net/url" "strconv" "github.com/drone/drone/model" "github.com/drone/drone/queue" "golang.org/x/net/context" "golang.org/x/net/context/ctxhttp" "golang.org/x/oauth2" ) const ( pathPull = "%s/api/queue/pull" pathWait = "%s/api/queue/wait/%d" pathStream = "%s/api/queue/stream/%d" pathPush = "%s/api/queue/status/%d" ) type client struct { client *http.Client base string // base url } // NewClient returns a client at the specified url. func NewClient(uri string) Client { return &client{http.DefaultClient, uri} } // NewClientToken returns a client at the specified url that // authenticates all outbound requests with the given token. func NewClientToken(uri, token string) Client { config := new(oauth2.Config) auther := config.Client(oauth2.NoContext, &oauth2.Token{AccessToken: token}) return &client{auther, uri} } // Pull pulls work from the server queue. func (c *client) Pull() (*queue.Work, error) { out := new(queue.Work) uri := fmt.Sprintf(pathPull, c.base) err := c.post(uri, nil, out) return out, err } // Push pushes an update to the server. func (c *client) Push(p *queue.Work) error { uri := fmt.Sprintf(pathPush, c.base, p.Job.ID) err := c.post(uri, p, nil) return err } // Stream streams the build logs to the server. func (c *client) Stream(id int64, rc io.ReadCloser) error { uri := fmt.Sprintf(pathStream, c.base, id) err := c.post(uri, rc, nil) return err } // Wait watches and waits for the build to cancel or finish. func (c *client) Wait(id int64) *Wait { ctx, cancel := context.WithCancel(context.Background()) return &Wait{id, c, ctx, cancel} } type Wait struct { id int64 client *client ctx context.Context cancel context.CancelFunc } func (w *Wait) Done() (*model.Job, error) { uri := fmt.Sprintf(pathWait, w.client.base, w.id) req, err := w.client.createRequest(uri, "POST", nil) if err != nil { return nil, err } res, err := ctxhttp.Do(w.ctx, w.client.client, req) if err != nil { return nil, err } defer res.Body.Close() job := &model.Job{} err = json.NewDecoder(res.Body).Decode(&job) if err != nil { return nil, err } return job, nil } func (w *Wait) Cancel() { w.cancel() } // // http request helper functions // // helper function for making an http GET request. func (c *client) get(rawurl string, out interface{}) error { return c.do(rawurl, "GET", nil, out) } // helper function for making an http POST request. func (c *client) post(rawurl string, in, out interface{}) error { return c.do(rawurl, "POST", in, out) } // helper function for making an http PUT request. func (c *client) put(rawurl string, in, out interface{}) error { return c.do(rawurl, "PUT", in, out) } // helper function for making an http PATCH request. func (c *client) patch(rawurl string, in, out interface{}) error { return c.do(rawurl, "PATCH", in, out) } // helper function for making an http DELETE request. func (c *client) delete(rawurl string) error { return c.do(rawurl, "DELETE", nil, nil) } // helper function to make an http request func (c *client) do(rawurl, method string, in, out interface{}) error { // executes the http request and returns the body as // and io.ReadCloser body, err := c.open(rawurl, method, in, out) if err != nil { return err } defer body.Close() // if a json response is expected, parse and return // the json response. if out != nil { return json.NewDecoder(body).Decode(out) } return nil } // helper function to open an http request func (c *client) open(rawurl, method string, in, out interface{}) (io.ReadCloser, error) { uri, err := url.Parse(rawurl) if err != nil { return nil, err } // creates a new http request to bitbucket. req, err := http.NewRequest(method, uri.String(), nil) if err != nil { return nil, err } // if we are posting or putting data, we need to // write it to the body of the request. if in != nil { rc, ok := in.(io.ReadCloser) if ok { req.Body = rc req.Header.Set("Content-Type", "plain/text") } else { inJson, err := json.Marshal(in) if err != nil { return nil, err } buf := bytes.NewBuffer(inJson) req.Body = ioutil.NopCloser(buf) req.ContentLength = int64(len(inJson)) req.Header.Set("Content-Length", strconv.Itoa(len(inJson))) req.Header.Set("Content-Type", "application/json") } } resp, err := c.client.Do(req) if err != nil { return nil, err } if resp.StatusCode > http.StatusPartialContent { defer resp.Body.Close() out, _ := ioutil.ReadAll(resp.Body) return nil, fmt.Errorf(string(out)) } return resp.Body, nil } // createRequest is a helper function that builds an http.Request. func (c *client) createRequest(rawurl, method string, in interface{}) (*http.Request, error) { uri, err := url.Parse(rawurl) if err != nil { return nil, err } // if we are posting or putting data, we need to // write it to the body of the request. var buf io.ReadWriter if in != nil { buf = new(bytes.Buffer) err := json.NewEncoder(buf).Encode(in) if err != nil { return nil, err } } // creates a new http request to bitbucket. req, err := http.NewRequest(method, uri.String(), buf) if err != nil { return nil, err } if in != nil { req.Header.Set("Content-Type", "application/json") } return req, nil }