Add streamer config, tests

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

reddit/streamer.go

@@ -0,0 +1,44 @@
+package reddit
+
+import "time"
+
+const defaultStreamInterval = time.Second * 5
+
+type streamConfig struct {
+	Interval       time.Duration
+	DiscardInitial bool
+	MaxRequests    int
+}
+
+// StreamOpt is a configuration option to configure a stream.
+type StreamOpt func(*streamConfig)
+
+// StreamInterval sets the frequency at which data will be fetched for the stream.
+// If the duration is 0 or less, it will not be set and the default will be used.
+func StreamInterval(v time.Duration) StreamOpt {
+	return func(c *streamConfig) {
+		if v > 0 {
+			c.Interval = v
+		}
+	}
+}
+
+// StreamDiscardInitial will discard data from the first fetch for the stream.
+func StreamDiscardInitial(c *streamConfig) {
+	c.DiscardInitial = true
+}
+
+// StreamMaxRequests sets a limit on the number of times data is fetched for a stream.
+// If less than or equal to 0, it is assumed to be infinite.
+func StreamMaxRequests(v int) StreamOpt {
+	return func(c *streamConfig) {
+		if v > 0 {
+			c.MaxRequests = v
+		}
+	}
+}
+
+// Streamer streams data to the client.
+// type Streamer interface {
+// 	Stream() (<-chan *rootListing, <-chan error, func())
+// }