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Cassandra reader

Cassandra reader provides message repository implementation for Cassandra.

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_CASSANDRA_READER_PORT	Service HTTP port	8180
MF_CASSANDRA_READER_DB_CLUSTER	Cassandra cluster comma separated addresses	127.0.0.1
MF_CASSANDRA_READER_DB_USER	Cassandra DB username
MF_CASSANDRA_READER_DB_PASS	Cassandra DB password
MF_CASSANDRA_READER_DB_KEYSPACE	Cassandra keyspace name	messages
MF_CASSANDRA_READER_DB_PORT	Cassandra DB port	9042
MF_CASSANDRA_READER_CLIENT_TLS	Flag that indicates if TLS should be turned on	false
MF_CASSANDRA_READER_CA_CERTS	Path to trusted CAs in PEM format
MF_CASSANDRA_READER_SERVER_CERT	Path to server certificate in pem format
MF_CASSANDRA_READER_SERVER_KEY	Path to server key 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	1

Deployment

  version: "3.7"
  cassandra-reader:
    image: mainflux/cassandra-reader:[version]
    container_name: [instance name]
    expose:
      - [Service HTTP port]
    restart: on-failure
    environment:
      MF_CASSANDRA_READER_PORT: [Service HTTP port]
      MF_CASSANDRA_READER_DB_CLUSTER: [Cassandra cluster comma separated addresses]
      MF_CASSANDRA_READER_DB_KEYSPACE: [Cassandra keyspace name]
      MF_CASSANDRA_READER_DB_USER: [Cassandra DB username]
      MF_CASSANDRA_READER_DB_PASS: [Cassandra DB password]
      MF_CASSANDRA_READER_DB_PORT: [Cassandra DB port]
      MF_CASSANDRA_READER_CLIENT_TLS: [Flag that indicates if TLS should be turned on]
      MF_CASSANDRA_READER_CA_CERTS: [Path to trusted CAs in PEM format]
      MF_CASSANDRA_READER_SERVER_CERT: [String path to server cert in pem format]
      MF_CASSANDRA_READER_SERVER_KEY: [String path to server key 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]
    ports:
      - [host machine port]:[configured HTTP port]

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 cassandra
make cassandra-reader

# copy binary to bin
make install

# Set the environment variables and run the service
MF_CASSANDRA_READER_PORT=[Service HTTP port] \
MF_CASSANDRA_READER_DB_CLUSTER=[Cassandra cluster comma separated addresses] \
MF_CASSANDRA_READER_DB_KEYSPACE=[Cassandra keyspace name] \
MF_CASSANDRA_READER_DB_USER=[Cassandra DB username] \
MF_CASSANDRA_READER_DB_PASS=[Cassandra DB password] \
MF_CASSANDRA_READER_DB_PORT=[Cassandra DB port] \
MF_CASSANDRA_READER_CLIENT_TLS=[Flag that indicates if TLS should be turned on] \
MF_CASSANDRA_READER_CA_CERTS=[Path to trusted CAs in PEM format] \
MF_CASSANDRA_READER_SERVER_CERT=[Path to server pem certificate file] \
MF_CASSANDRA_READER_SERVER_KEY=[Path to server pem key file] \
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-cassandra-reader

Using docker-compose

This service can be deployed using docker containers. Docker compose file is available in <project_root>/docker/addons/cassandra-reader/docker-compose.yml. In order to run all Mainflux core services, as well as mentioned optional ones, execute following command:

docker-compose -f docker/docker-compose.yml up -d
./docker/addons/cassandra-writer/init.sh
docker-compose -f docker/addons/casandra-reader/docker-compose.yml up -d

Usage

Service exposes HTTP API for fetching messages.

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