README
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WebSocket adapter
WebSocket adapter provides an WebSocket API for sending and receiving messages through the platform.
Configuration
The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.
| Variable | Description | Default |
|---|---|---|
| MF_WS_ADAPTER_PORT | Service WS port | 8190 |
| MF_BROKER_URL | Message broker instance URL | nats://localhost:4222 |
| MF_WS_ADAPTER_LOG_LEVEL | Log level for the WS Adapter | error |
| MF_WS_ADAPTER_CLIENT_TLS | Flag that indicates if TLS should be turned on | false |
| MF_WS_ADAPTER_CA_CERTS | Path to trusted CAs in PEM format | |
| MF_JAEGER_URL | Jaeger server URL | localhost:6831 |
| MF_THINGS_AUTH_GRPC_URL | Things service Auth gRPC URL | localhost:8181 |
| MF_THINGS_AUTH_GRPC_TIMEOUT | Things service Auth gRPC request timeout in seconds | 1s |
Deployment
The service is distributed as Docker container. Check the ws-adapter service section in docker-compose to see how the service is deployed.
Running this service outside of container requires working instance of the message broker service. To start the service outside of the container, execute the following shell script:
# download the latest version of the service
git clone https://github.com/MainfluxLabs/mainflux
cd mainflux
# compile the ws
make ws
# copy binary to bin
make install
# set the environment variables and run the service
MF_Broker_URL=[Message broker instance URL] \
MF_WS_ADAPTER_PORT=[Service WS port] \
MF_WS_ADAPTER_LOG_LEVEL=[WS adapter log level] \
MF_WS_ADAPTER_CLIENT_TLS=[Flag that indicates if TLS should be turned on] \
MF_WS_ADAPTER_CA_CERTS=[Path to trusted CAs in PEM format] \
MF_JAEGER_URL=[Jaeger server URL] \
MF_THINGS_AUTH_GRPC_URL=[Things service Auth gRPC URL] \
MF_THINGS_AUTH_GRPC_TIMEOUT=[Things service Auth gRPC request timeout in seconds] \
$GOBIN/mainfluxlabs-ws
Usage
For more information about service capabilities and its usage, please check out the WebSocket paragraph in the Getting Started guide.
Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
var ( // ErrFailedMessagePublish indicates that message publishing failed. ErrFailedMessagePublish = errors.New("failed to publish message") // ErrFailedSubscription indicates that client couldn't subscribe to specified channel ErrFailedSubscription = errors.New("failed to subscribe to a channel") // ErrFailedUnsubscribe indicates that client couldn't unsubscribe from specified channel ErrFailedUnsubscribe = errors.New("failed to unsubscribe from a channel") // ErrFailedConnection indicates that service couldn't connect to message broker. ErrFailedConnection = errors.New("failed to connect to message broker") // ErrInvalidConnection indicates that client couldn't subscribe to message broker ErrInvalidConnection = errors.New("nats: invalid connection") ErrUnauthorizedAccess = errors.New("missing or invalid credentials provided") // ErrEmptyTopic indicate absence of thingKey in the request ErrEmptyTopic = errors.New("empty topic") // ErrEmptyID indicate absence of channelID in the request ErrEmptyID = errors.New("empty id") )
Functions ¶
This section is empty.
Types ¶
type Client ¶
type Client struct {
// contains filtered or unexported fields
}
Client handles messaging and websocket connection
type Service ¶
type Service interface {
// Publish Message
Publish(ctx context.Context, thingKey string, msg protomfx.Message) error
// Subscribe subscribes to a channel with specified id.
Subscribe(ctx context.Context, thingKey, chanID, subtopic string, client *Client) error
// Unsubscribe method is used to stop observing resource.
Unsubscribe(ctx context.Context, thingKey, chanID, subtopic string) error
}
Service specifies web socket service API.
Source Files
Directories