Refactoring: new packages console, http, Progress is interface.

aptly/interfaces.go

@@ -4,6 +4,7 @@ package aptly
 
 import (
 	"github.com/smira/aptly/utils"
+	"io"
 	"os"
 )
 
@@ -13,7 +14,7 @@ import (
 type PackagePool interface {
 	Path(filename string, hashMD5 string) (string, error)
 	RelativePath(filename string, hashMD5 string) (string, error)
-	FilepathList(progress *utils.Progress) ([]string, error)
+	FilepathList(progress Progress) ([]string, error)
 	Remove(path string) (size int64, err error)
 }
 
@@ -26,3 +27,30 @@ type PublishedStorage interface {
 	LinkFromPool(prefix string, component string, poolDirectory string, sourcePool PackagePool, sourcePath string) (string, error)
 	ChecksumsForFile(path string) (utils.ChecksumInfo, error)
 }
+
+// Progress is a progress displaying entity, it allows progress bars & simple prints
+type Progress interface {
+	// Writer interface to support progress bar ticking
+	io.Writer
+	// Start makes progress start its work
+	Start()
+	// Shutdown shuts down progress display
+	Shutdown()
+	// InitBar starts progressbar for count bytes or count items
+	InitBar(count int64, isBytes bool)
+	// ShutdownBar stops progress bar and hides it
+	ShutdownBar()
+	// AddBar increments progress for progress bar
+	AddBar(count int)
+	// Printf does printf but in safe manner: not overwriting progress bar
+	Printf(msg string, a ...interface{})
+}
+
+// Downloader is parallel HTTP fetcher
+type Downloader interface {
+	Download(url string, destination string, result chan<- error)
+	DownloadWithChecksum(url string, destination string, result chan<- error, expected utils.ChecksumInfo, ignoreMismatch bool)
+	Pause()
+	Resume()
+	Shutdown()
+}