make Client an interface, make Message a plain structv0.0.3

1 files changed, 30 insertions, 0 deletions

diff --git a/api.go b/api.go
new file mode 100644
index 0000000..8397cb9
--- /dev/null
+++ b/api.go
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2020 Ethel Morgan
+//
+// SPDX-License-Identifier: MIT
+
+// Package catbus is a convenience wrapper around MQTT for use with Catbus.
+package catbus
+
+type (
+	MessageHandler func(Client, Message)
+
+	Message struct {
+		Payload   string
+		Retention Retention
+		Topic     string
+	}
+
+	Client interface {
+		Connect() error
+		Subscribe(topic string, f MessageHandler) error
+		Publish(topic string, retention Retention, payload string) error
+	}
+
+	// Retention is whether or not the MQTT broker should retain the message.
+	Retention bool
+)
+
+const (
+	Retain     = Retention(true)
+	DontRetain = Retention(false)
+)