http

README

HTTP adapter

HTTP adapter provides an HTTP API for sending 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
MG_HTTP_ADAPTER_LOG_LEVEL	Log level for the HTTP Adapter (debug, info, warn, error)	info
MG_HTTP_ADAPTER_HOST	Service HTTP host	""
MG_HTTP_ADAPTER_PORT	Service HTTP port	80
MG_HTTP_ADAPTER_SERVER_CERT	Path to the PEM encoded server certificate file	""
MG_HTTP_ADAPTER_SERVER_KEY	Path to the PEM encoded server key file	""
MG_THINGS_AUTH_GRPC_URL	Things service Auth gRPC URL	localhost:7000
MG_THINGS_AUTH_GRPC_TIMEOUT	Things service Auth gRPC request timeout in seconds	1s
MG_THINGS_AUTH_GRPC_CLIENT_CERT	Path to the PEM encoded things service Auth gRPC client certificate file	""
MG_THINGS_AUTH_GRPC_CLIENT_KEY	Path to the PEM encoded things service Auth gRPC client key file	""
MG_THINGS_AUTH_GRPC_SERVER_CERTS	Path to the PEM encoded things server Auth gRPC server trusted CA certificate file	""
MG_MESSAGE_BROKER_URL	Message broker instance URL	nats://localhost:4222
MG_JAEGER_URL	Jaeger server URL	http://localhost:14268/api/traces
MG_JAEGER_TRACE_RATIO	Jaeger sampling ratio	1.0
MG_SEND_TELEMETRY	Send telemetry to magistrala call home server	true
MG_HTTP_ADAPTER_INSTANCE_ID	Service instance ID	""

Deployment

The service itself is distributed as Docker container. Check the http-adapter service section in docker-compose to see how service is deployed.

Running this service outside of container requires working instance of the message broker service, things service and Jaeger server. 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/absmach/magistrala

cd magistrala

# compile the http
make http

# copy binary to bin
make install

# set the environment variables and run the service
MG_HTTP_ADAPTER_LOG_LEVEL=info \
MG_HTTP_ADAPTER_HOST=localhost \
MG_HTTP_ADAPTER_PORT=80 \
MG_HTTP_ADAPTER_SERVER_CERT="" \
MG_HTTP_ADAPTER_SERVER_KEY="" \
MG_THINGS_AUTH_GRPC_URL=localhost:7000 \
MG_THINGS_AUTH_GRPC_TIMEOUT=1s \
MG_THINGS_AUTH_GRPC_CLIENT_CERT="" \
MG_THINGS_AUTH_GRPC_CLIENT_KEY="" \
MG_THINGS_AUTH_GRPC_SERVER_CERTS="" \
MG_MESSAGE_BROKER_URL=nats://localhost:4222 \
MG_JAEGER_URL=http://localhost:14268/api/traces \
MG_JAEGER_TRACE_RATIO=1.0 \
MG_SEND_TELEMETRY=true \
MG_HTTP_ADAPTER_INSTANCE_ID="" \
$GOBIN/magistrala-http

Setting MG_HTTP_ADAPTER_SERVER_CERT and MG_HTTP_ADAPTER_SERVER_KEY will enable TLS against the service. The service expects a file in PEM format for both the certificate and the key.

Setting MG_THINGS_AUTH_GRPC_CLIENT_CERT and MG_THINGS_AUTH_GRPC_CLIENT_KEY will enable TLS against the things service. The service expects a file in PEM format for both the certificate and the key. Setting MG_THINGS_AUTH_GRPC_SERVER_CERTS will enable TLS against the things service trusting only those CAs that are provided. The service expects a file in PEM format of trusted CAs.

Usage

HTTP Authorization request header contains the credentials to authenticate a Thing. The authorization header can be a plain Thing key or a Thing key encoded as a password for Basic Authentication. In case the Basic Authentication schema is used, the username is ignored. For more information about service capabilities and its usage, please check out the API documentation.

Documentation

Overview

Package http contains the domain concept definitions needed to support Magistrala HTTP Adapter functionality.

Index

• Constants
• Variables
• func NewHandler(publisher messaging.Publisher, logger *slog.Logger, ...) session.Handler

Constants

const (
	LogInfoConnected = "connected with thing_key %s"
	// ThingPrefix represents the key prefix for Thing authentication scheme.
	ThingPrefix      = "Thing "
	LogInfoPublished = "published with client_id %s to the topic %s"
)

Log message formats.

Variables

var (
	ErrMalformedSubtopic         = errors.New("malformed subtopic")
	ErrClientNotInitialized      = errors.New("client is not initialized")
	ErrMalformedTopic            = errors.New("malformed topic")
	ErrMissingTopicPub           = errors.New("failed to publish due to missing topic")
	ErrMissingTopicSub           = errors.New("failed to subscribe due to missing topic")
	ErrFailedConnect             = errors.New("failed to connect")
	ErrFailedPublish             = errors.New("failed to publish")
	ErrFailedParseSubtopic       = errors.New("failed to parse subtopic")
	ErrFailedPublishConnectEvent = errors.New("failed to publish connect event")
	ErrFailedPublishToMsgBroker  = errors.New("failed to publish to magistrala message broker")
)

Error wrappers for MQTT errors.

Functions

func NewHandler

func NewHandler(publisher messaging.Publisher, logger *slog.Logger, authClient magistrala.AuthzServiceClient) session.Handler

NewHandler creates new Handler entity.