Merge pull request #3 from mikegray/mike.migr8

Initial migration from singularity CLI

.gitignore

@@ -1 +1,2 @@
 *~
+vendor/

client/build.go

@@ -0,0 +1,112 @@
+// Copyright (c) 2018-2019, Sylabs Inc. All rights reserved.
+// This software is licensed under a 3-clause BSD license. Please consult the
+// LICENSE.md file distributed with the sources of this project regarding your
+// rights to use or distribute this software.
+
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/golang/glog"
+	"github.com/gorilla/websocket"
+	jsonresp "github.com/sylabs/json-resp"
+)
+
+// Build submits a build job to the Build Service. The context controls the
+// lifetime of the request.
+func (c *Client) SubmitBuild(ctx context.Context, d Definition, libraryRef string, libraryURL string) (rd ResponseData, err error) {
+
+	b, err := json.Marshal(RequestData{
+		Definition: d,
+		LibraryRef: libraryRef,
+		LibraryURL: libraryURL,
+	})
+	if err != nil {
+		return
+	}
+
+	req, err := c.newRequest(http.MethodPost, "/v1/build", "", bytes.NewReader(b))
+	if err != nil {
+		return
+	}
+	req = req.WithContext(ctx)
+	req.Header.Set("Content-Type", "application/json")
+	glog.V(2).Infof("Sending build request to %s", req.URL.String())
+
+	res, err := c.HTTPClient.Do(req)
+	if err != nil {
+		return
+	}
+	defer res.Body.Close()
+
+	err = jsonresp.ReadResponse(res.Body, &rd)
+	if err == nil {
+		glog.V(2).Infof("Build response - id: %s, wsurl: %s, libref: %s",
+			rd.ID, rd.WSURL, rd.LibraryRef)
+	}
+	return
+}
+
+// StreamOutput reads log output from the websocket URL. The context controls
+// the lifetime of the request.
+func (c *Client) StreamOutput(ctx context.Context, wsURL string) error {
+	h := http.Header{}
+	c.setRequestHeaders(h)
+
+	ws, resp, err := websocket.DefaultDialer.Dial(wsURL, h)
+	if err != nil {
+		glog.V(2).Infof("websocket dial err - %s, partial response: %+v", err, resp)
+		return err
+	}
+	defer ws.Close()
+
+	for {
+		// Check if context has expired
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+
+		// Read from websocket
+		mt, msg, err := ws.ReadMessage()
+		if err != nil {
+			if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
+				return nil
+			}
+			glog.V(2).Infof("websocket read message err - %s", err)
+			return err
+		}
+
+		// Print to terminal
+		switch mt {
+		case websocket.TextMessage:
+			fmt.Printf("%s", msg)
+		case websocket.BinaryMessage:
+			fmt.Print("Ignoring binary message")
+		}
+	}
+}
+
+// GetBuildStatus gets the status of a build from the Remote Build Service
+func (c *Client) GetBuildStatus(ctx context.Context, buildID string) (rd ResponseData, err error) {
+	req, err := c.newRequest(http.MethodGet, "/v1/build/"+buildID, "", nil)
+	if err != nil {
+		return
+	}
+	req = req.WithContext(ctx)
+
+	res, err := c.HTTPClient.Do(req)
+	if err != nil {
+		return
+	}
+	defer res.Body.Close()
+
+	err = jsonresp.ReadResponse(res.Body, &rd)
+	return
+}