feat(docker): error when HTTP requests fail

src/build/build.v

@@ -56,6 +56,7 @@ pub fn create_build_image(base_image string) ?string {
 
 	// This loop waits until the container has stopped, so we can remove it after
 	for {
+	println('wot')
 		data := dd.inspect_container(id)?
 
 		if !data.state.running {

src/docker/containers.v

@@ -5,6 +5,10 @@ import net.urllib
 import time
 import net.http
 
+struct DockerError {
+	message string
+}
+
 struct Container {
 	id    string   [json: Id]
 	names []string [json: Names]
@@ -12,7 +16,13 @@ struct Container {
 
 pub fn (mut d DockerDaemon) containers() ?[]Container {
 	d.send_request('GET', urllib.parse('/v1.41/containers/json')?)?
-	_, res := d.read_response()?
+	head, res := d.read_response()?
+
+	if head.status_code != 200 {
+		data := json.decode(DockerError, res)?
+
+		return error(data.message)
+	}
 
 	data := json.decode([]Container, res)?
 
@@ -37,18 +47,28 @@ pub:
 
 pub fn (mut d DockerDaemon) create_container(c NewContainer) ?CreatedContainer {
 	d.send_request_with_json('POST', urllib.parse('/v1.41/containers/create')?, c)?
-	_, res := d.read_response()?
+	head, res := d.read_response()?
+
+	if head.status_code != 201 {
+		data := json.decode(DockerError, res)?
+
+		return error(data.message)
+	}
 
 	data := json.decode(CreatedContainer, res)?
 
 	return data
 }
 
-pub fn (mut d DockerDaemon) start_container(id string) ?bool {
+pub fn (mut d DockerDaemon) start_container(id string) ? {
 	d.send_request('POST', urllib.parse('/v1.41/containers/$id/start')?)?
-	head := d.read_response_head() ?
+	head, body := d.read_response() ?
 
-	return head.status_code == 204
+	if head.status_code != 204 {
+		data := json.decode(DockerError, body)?
+
+		return error(data.message)
+	}
 }
 
 // create_container creates a container defined by the given configuration. If
@@ -94,7 +114,9 @@ pub fn (mut d DockerDaemon) inspect_container(id string) ?ContainerInspect {
 	head, body := d.read_response()?
 
 	if head.status_code != 200 {
-		return error('Failed to inspect container.')
+		data := json.decode(DockerError, body)?
+
+		return error(data.message)
 	}
 
 	mut data := json.decode(ContainerInspect, body)?
@@ -130,7 +152,13 @@ pub fn inspect_container(id string) ?ContainerInspect {
 
 pub fn (mut d DockerDaemon) remove_container(id string) ? {
 	d.send_request('DELETE', urllib.parse('/v1.41/containers/$id')?)?
-	head := d.read_response_head() ?
+	head, body := d.read_response() ?
+
+	if head.status_code != 204 {
+		data := json.decode(DockerError, body)?
+
+		return error(data.message)
+	}
 }
 
 // remove_container removes a container with a given ID.

src/docker/socket.v

@@ -50,6 +50,8 @@ pub fn (mut d DockerDaemon) send_request_with_json<T>(method string, url urllib.
 
 // read_response_head consumes the socket's contents until it encounters
 // '\r\n\r\n', after which it parses the response as an HTTP response.
+// Importantly, this function never consumes past the HTTP separator, so the
+// body can be read fully later on.
 pub fn (mut d DockerDaemon) read_response_head() ?http.Response {
 	mut c := 0
 	mut buf := []u8{len: 4}
@@ -88,6 +90,10 @@ pub fn (mut d DockerDaemon) read_response_head() ?http.Response {
 }
 
 pub fn (mut d DockerDaemon) read_response_body(length int) ?string {
+	if length == 0 {
+		return ''
+	}
+
 	mut buf := []u8{len: docker.buf_len}
 	mut c := 0
 	mut builder := strings.new_builder(docker.buf_len)

src/docker/stream.v

@@ -0,0 +1,9 @@
+module docker
+
+import io
+
+struct ChunkedResponseStream {
+	reader io.Reader
+}
+
+