Postgres writer

Postgres writer provides message repository implementation for Postgres.

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_POSTGRES_WRITER_LOG_LEVEL	Service log level	info
MG_POSTGRES_WRITER_CONFIG_PATH	Config file path with Message broker subjects list, payload type and content-type	/config.toml
MG_POSTGRES_WRITER_HTTP_HOST	Service HTTP host	localhost
MG_POSTGRES_WRITER_HTTP_PORT	Service HTTP port	9010
MG_POSTGRES_WRITER_HTTP_SERVER_CERT	Service HTTP server certificate path	""
MG_POSTGRES_WRITER_HTTP_SERVER_KEY	Service HTTP server key	""
MG_POSTGRES_HOST	Postgres DB host	postgres
MG_POSTGRES_PORT	Postgres DB port	5432
MG_POSTGRES_USER	Postgres user	magistrala
MG_POSTGRES_PASS	Postgres password	magistrala
MG_POSTGRES_NAME	Postgres database name	messages
MG_POSTGRES_SSL_MODE	Postgres SSL mode	disabled
MG_POSTGRES_SSL_CERT	Postgres SSL certificate path	""
MG_POSTGRES_SSL_KEY	Postgres SSL key	""
MG_POSTGRES_SSL_ROOT_CERT	Postgres SSL root certificate path	""
MG_MESSAGE_BROKER_URL	Message broker instance URL	nats://localhost:4222
MG_JAEGER_URL	Jaeger server URL	http://jaeger:14268/api/traces
MG_SEND_TELEMETRY	Send telemetry to magistrala call home server	true
MG_POSTGRES_WRITER_INSTANCE_ID	Service instance ID	""

Deployment

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

To start the service, execute the following shell script:

# download the latest version of the service
git clone https://github.com/absmach/magistrala

cd magistrala

# compile the postgres writer
make postgres-writer

# copy binary to bin
make install

# Set the environment variables and run the service
MG_POSTGRES_WRITER_LOG_LEVEL=[Service log level] \
MG_POSTGRES_WRITER_CONFIG_PATH=[Config file path with Message broker subjects list, payload type and content-type] \
MG_POSTGRES_WRITER_HTTP_HOST=[Service HTTP host] \
MG_POSTGRES_WRITER_HTTP_PORT=[Service HTTP port] \
MG_POSTGRES_WRITER_HTTP_SERVER_CERT=[Service HTTP server cert] \
MG_POSTGRES_WRITER_HTTP_SERVER_KEY=[Service HTTP server key] \
MG_POSTGRES_HOST=[Postgres host] \
MG_POSTGRES_PORT=[Postgres port] \
MG_POSTGRES_USER=[Postgres user] \
MG_POSTGRES_PASS=[Postgres password] \
MG_POSTGRES_NAME=[Postgres database name] \
MG_POSTGRES_SSL_MODE=[Postgres SSL mode] \
MG_POSTGRES_SSL_CERT=[Postgres SSL cert] \
MG_POSTGRES_SSL_KEY=[Postgres SSL key] \
MG_POSTGRES_SSL_ROOT_CERT=[Postgres SSL Root cert] \
MG_MESSAGE_BROKER_URL=[Message broker instance URL] \
MG_JAEGER_URL=[Jaeger server URL] \
MG_SEND_TELEMETRY=[Send telemetry to magistrala call home server] \
MG_POSTGRES_WRITER_INSTANCE_ID=[Service instance ID] \

$GOBIN/magistrala-postgres-writer

Usage

Starting service will start consuming normalized messages in SenML format.