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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package mqtt | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "errors" | ||
| "time" | ||
|
|
||
| mqttLib "github.com/at-wat/mqtt-go" | ||
| ) | ||
|
|
||
| const ( | ||
| // It's not expected that sending a message will take a long time, | ||
| // so the keepalive is relatively short. | ||
| keepAlive = 30 | ||
| connectTimeout = 10 | ||
| ) | ||
|
|
||
| // mqttClient is a wrapper around the mqtt-go client, | ||
| // implements MQTT v3.1.1 protocol: http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html | ||
| type mqttClient struct { | ||
| client mqttLib.Client | ||
| } | ||
|
|
||
| func (c *mqttClient) Connect(ctx context.Context, brokerURL, clientID, username, password string, tlsCfg *tls.Config) error { | ||
| ctx, cancel := context.WithTimeout(ctx, connectTimeout*time.Second) | ||
| defer cancel() | ||
|
|
||
| dialer := &mqttLib.URLDialer{ | ||
| URL: brokerURL, | ||
| Options: []mqttLib.DialOption{ | ||
| mqttLib.WithTLSConfig(tlsCfg), | ||
| }, | ||
| } | ||
| cli, err := dialer.DialContext(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| c.client = cli | ||
|
|
||
| connectOpts := []mqttLib.ConnectOption{ | ||
| // The client only publishes messages and doesn't require the server to keep a session. | ||
| mqttLib.WithCleanSession(true), | ||
| mqttLib.WithKeepAlive(keepAlive), | ||
| mqttLib.WithUserNamePassword(username, password), | ||
| } | ||
|
|
||
| _, err = c.client.Connect(ctx, clientID, connectOpts...) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| func (c *mqttClient) Disconnect(ctx context.Context) error { | ||
| if c.client == nil { | ||
| return nil | ||
| } | ||
|
|
||
| return c.client.Disconnect(ctx) | ||
| } | ||
|
|
||
| func (c *mqttClient) Publish(ctx context.Context, message message) error { | ||
| if c.client == nil { | ||
| return errors.New("failed to publish: client is not connected to the broker") | ||
| } | ||
|
|
||
| return c.client.Publish(ctx, &mqttLib.Message{ | ||
| Topic: message.topic, | ||
| QoS: mqttLib.QoS0, | ||
| Retain: false, | ||
| Payload: message.payload, | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package mqtt | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
|
|
||
| mqttLib "github.com/at-wat/mqtt-go" | ||
| "github.com/stretchr/testify/mock" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| type mockMQTTLibClient struct { | ||
| mock.Mock | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Connect(ctx context.Context, clientID string, opts ...mqttLib.ConnectOption) (sessionPresent bool, err error) { | ||
| args := m.Called(ctx, clientID, opts) | ||
|
|
||
| return args.Bool(0), args.Error(1) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Disconnect(ctx context.Context) error { | ||
| args := m.Called(ctx) | ||
|
|
||
| return args.Error(0) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Publish(ctx context.Context, message *mqttLib.Message) error { | ||
| args := m.Called(ctx, message) | ||
|
|
||
| return args.Error(0) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Subscribe(ctx context.Context, subs ...mqttLib.Subscription) ([]mqttLib.Subscription, error) { | ||
| args := m.Called(ctx, subs) | ||
|
|
||
| return nil, args.Error(0) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Unsubscribe(ctx context.Context, subs ...string) error { | ||
| args := m.Called(ctx, subs) | ||
|
|
||
| return args.Error(0) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Ping(ctx context.Context) error { | ||
| args := m.Called(ctx) | ||
|
|
||
| return args.Error(0) | ||
| } | ||
|
|
||
| func (m *mockMQTTLibClient) Handle(handler mqttLib.Handler) { | ||
| m.Called(handler) | ||
| } | ||
|
|
||
| func TestMqttClientPublish(t *testing.T) { | ||
| testCases := []struct { | ||
| name string | ||
| topic string | ||
| payload []byte | ||
| }{ | ||
| { | ||
| name: "Simple publish", | ||
| topic: "test", | ||
| payload: []byte("test"), | ||
| }, | ||
| } | ||
|
|
||
| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| mc := new(mockMQTTLibClient) | ||
| c := &mqttClient{ | ||
| client: mc, | ||
| } | ||
|
|
||
| ctx := context.Background() | ||
| mc.On("Publish", ctx, &mqttLib.Message{ | ||
| Topic: tc.topic, | ||
| Payload: tc.payload, | ||
| QoS: mqttLib.QoS0, | ||
| Retain: false, | ||
| }).Return(nil) | ||
|
|
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| err := c.Publish(ctx, message{ | ||
| topic: tc.topic, | ||
| payload: tc.payload, | ||
| }) | ||
|
|
||
| require.NoError(t, err) | ||
| mc.AssertExpectations(t) | ||
| }) | ||
| } | ||
| } |
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