Mainflux.mainflux/readers/postgres

Postgres reader

Postgres reader 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
MF_POSTGRES_READER_LOG_LEVEL	Service log level	info
MF_POSTGRES_READER_PORT	Service HTTP port	9009
MF_POSTGRES_READER_CLIENT_TLS	TLS mode flag	false
MF_POSTGRES_READER_CA_CERTS	Path to trusted CAs in PEM format
MF_POSTGRES_READER_DB_HOST	Postgres DB host	postgres
MF_POSTGRES_READER_DB_PORT	Postgres DB port	5432
MF_POSTGRES_READER_DB_USER	Postgres user	mainflux
MF_POSTGRES_READER_DB_PASS	Postgres password	mainflux
MF_POSTGRES_READER_DB	Postgres database name	messages
MF_POSTGRES_READER_DB_SSL_MODE	Postgres SSL mode	disabled
MF_POSTGRES_READER_DB_SSL_CERT	Postgres SSL certificate path	""
MF_POSTGRES_READER_DB_SSL_KEY	Postgres SSL key	""
MF_POSTGRES_READER_DB_SSL_ROOT_CERT	Postgres SSL root certificate path	""
MF_JAEGER_URL	Jaeger server URL	localhost:6831
MF_THINGS_AUTH_GRPC_URL	Things service Auth gRPC URL	localhost:7000
MF_THINGS_AUTH_GRPC_TIMEOUT	Things service Auth gRPC timeout in seconds	1s
MF_AUTH_GRPC_URL	Users service gRPC URL	localhost:7001
MF_AUTH_GRPC_TIMEOUT	Users service gRPC request timeout in seconds	1s
MF_SEND_TELEMETRY	Send telemetry to mainflux call home server	true

Deployment

The service itself is distributed as Docker container. Check the postgres-reader 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/mainflux/mainflux

cd mainflux

# compile the postgres writer
make postgres-writer

# copy binary to bin
make install

# Set the environment variables and run the service
MF_POSTGRES_READER_LOG_LEVEL=[Service log level] \
MF_POSTGRES_READER_PORT=[Service HTTP port] \
MF_POSTGRES_READER_CLIENT_TLS =[TLS mode flag] \
MF_POSTGRES_READER_CA_CERTS=[Path to trusted CAs in PEM format] \
MF_POSTGRES_READER_DB_HOST=[Postgres host] \
MF_POSTGRES_READER_DB_PORT=[Postgres port] \
MF_POSTGRES_READER_DB_USER=[Postgres user] \
MF_POSTGRES_READER_DB_PASS=[Postgres password] \
MF_POSTGRES_READER_DB=[Postgres database name] \
MF_POSTGRES_READER_DB_SSL_MODE=[Postgres SSL mode] \
MF_POSTGRES_READER_DB_SSL_CERT=[Postgres SSL cert] \
MF_POSTGRES_READER_DB_SSL_KEY=[Postgres SSL key] \
MF_POSTGRES_READER_DB_SSL_ROOT_CERT=[Postgres SSL Root cert] \
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/mainflux-postgres-reader

Usage

Starting service will start consuming normalized messages in SenML format.

Comparator Usage Guide:

Comparator	Usage	Example
eq	Return values that are equal to the query	eq["active"] -> "active"
ge	Return values that are substrings of the query	ge["tiv"] -> "active" and "tiv"
gt	Return values that are substrings of the query and not equal to the query	gt["tiv"] -> "active"
le	Return values that are superstrings of the query	le["active"] -> "tiv"
lt	Return values that are superstrings of the query and not equal to the query	lt["active"] -> "active" and "tiv"

Official docs can be found here.