Vendor dependencies with dep

vendor/github.com/ncw/swift/watchdog_reader.go

@@ -0,0 +1,55 @@
+package swift
+
+import (
+	"io"
+	"time"
+)
+
+var watchdogChunkSize = 1 << 20 // 1 MiB
+
+// An io.Reader which resets a watchdog timer whenever data is read
+type watchdogReader struct {
+	timeout   time.Duration
+	reader    io.Reader
+	timer     *time.Timer
+	chunkSize int
+}
+
+// Returns a new reader which will kick the watchdog timer whenever data is read
+func newWatchdogReader(reader io.Reader, timeout time.Duration, timer *time.Timer) *watchdogReader {
+	return &watchdogReader{
+		timeout:   timeout,
+		reader:    reader,
+		timer:     timer,
+		chunkSize: watchdogChunkSize,
+	}
+}
+
+// Read reads up to len(p) bytes into p
+func (t *watchdogReader) Read(p []byte) (int, error) {
+	//read from underlying reader in chunks not larger than t.chunkSize
+	//while resetting the watchdog timer before every read; the small chunk
+	//size ensures that the timer does not fire when reading a large amount of
+	//data from a slow connection
+	start := 0
+	end := len(p)
+	for start < end {
+		length := end - start
+		if length > t.chunkSize {
+			length = t.chunkSize
+		}
+
+		resetTimer(t.timer, t.timeout)
+		n, err := t.reader.Read(p[start : start+length])
+		start += n
+		if n == 0 || err != nil {
+			return start, err
+		}
+	}
+
+	resetTimer(t.timer, t.timeout)
+	return start, nil
+}
+
+// Check it satisfies the interface
+var _ io.Reader = &watchdogReader{}