feat(docker): added StreamFormatReader

src/docker/containers.v

@@ -168,6 +168,21 @@ pub fn remove_container(id string) ?bool {
 	return res.status_code == 204
 }
 
+pub fn (mut d DockerDaemon) get_container_logs(id string) ?&StreamFormatReader {
+	d.send_request('GET', urllib.parse('/v1.41/containers/$id/logs?stdout=true&stderr=true')?)?
+	head := d.read_response_head()?
+
+	if head.status_code != 200 {
+		content_length := head.header.get(http.CommonHeader.content_length)?.int()
+		body := d.read_response_body(content_length)?
+		data := json.decode(DockerError, body)?
+
+		return error(data.message)
+	}
+
+	return d.get_stream_format_reader()
+}
+
 // get_container_logs retrieves the logs for a Docker container, both stdout &
 // stderr.
 pub fn get_container_logs(id string) ?string {

src/docker/socket.v

@@ -123,3 +123,10 @@ pub fn (mut d DockerDaemon) get_chunked_response_reader() &ChunkedResponseReader
 
 	return r
 }
+
+pub fn (mut d DockerDaemon) get_stream_format_reader() &StreamFormatReader {
+	r := new_chunked_response_reader(d.reader)
+	r2 := new_stream_format_reader(r)
+
+	return r2
+}

src/docker/stream.v

@@ -8,9 +8,6 @@ import encoding.hex
 struct ChunkedResponseReader {
 mut:
 	reader              io.Reader
-	// buf []u8
-	// offset int
-	// len int
 	bytes_left_in_chunk u64
 	end_of_stream       bool
 	started             bool
@@ -97,3 +94,57 @@ fn (mut r ChunkedResponseReader) read_chunk_size() ?u64 {
 
 	return num
 }
+
+struct StreamFormatReader {
+	stdout bool
+	stderr bool
+	stdin  bool
+mut:
+	reader              io.Reader
+	bytes_left_in_chunk u32
+	end_of_stream       bool
+}
+
+pub fn new_stream_format_reader(reader io.Reader) &StreamFormatReader {
+	r := &StreamFormatReader{
+		reader: reader
+	}
+
+	return r
+}
+
+pub fn (mut r StreamFormatReader) read(mut buf []u8) ?int {
+	if r.end_of_stream {
+		return none
+	}
+
+	if r.bytes_left_in_chunk == 0 {
+		r.bytes_left_in_chunk = r.read_chunk_size()?
+
+		if r.end_of_stream {
+			return none
+		}
+	}
+
+	mut c := 0
+
+	if buf.len > r.bytes_left_in_chunk {
+		c = r.reader.read(mut buf[..r.bytes_left_in_chunk])?
+	} else {
+		c = r.reader.read(mut buf)?
+	}
+
+	r.bytes_left_in_chunk -= u32(c)
+
+	return c
+}
+
+fn (mut r StreamFormatReader) read_chunk_size() ?u32 {
+	mut buf := []u8{len: 8}
+
+	r.reader.read(mut buf)?
+
+	num := binary.big_endian_u32(buf[4..])
+
+	return num
+}