5.8 KiB
5.8 KiB
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_LOG_LEVEL | Cassandra service log level | debug |
| MF_CASSANDRA_READER_HTTP_HOST | Cassandra service HTTP host | localhost |
| MF_CASSANDRA_READER_HTTP_PORT | Cassandra service HTTP port | 9003 |
| MF_CASSANDRA_READER_HTTP_SERVER_CERT | Cassandra service HTTP server cert | "" |
| MF_CASSANDRA_READER_HTTP_SERVER_KEY | Cassandra service HTTP server key | "" |
| MF_CASSANDRA_CLUSTER | Cassandra cluster comma separated addresses | localhost |
| MF_CASSANDRA_USER | Cassandra DB username | mainflux |
| MF_CASSANDRA_PASS | Cassandra DB password | mainflux |
| MF_CASSANDRA_KEYSPACE | Cassandra keyspace name | messages |
| MF_CASSANDRA_PORT | Cassandra DB port | 9042 |
| MF_THINGS_AUTH_GRPC_URL | Things service Auth gRPC URL | localhost:7000 |
| MF_THINGS_AUTH_GRPC_TIMEOUT | Things service Auth gRPC request timeout in seconds | 1 |
| MF_THINGS_AUTH_GRPC_CLIENT_TLS | Things service Auth gRPC TLS enabled | false |
| MF_THINGS_AUTH_GRPC_CA_CERTS | Things service Auth gRPC CA certificates | "" |
| MF_AUTH_GRPC_URL | Users service gRPC URL | localhost:7001 |
| MF_AUTH_GRPC_TIMEOUT | Users service gRPC request timeout in seconds | 1s |
| MF_AUTH_GRPC_CLIENT_TLS | Users service gRPC TLS enabled | false |
| MF_AUTH_GRPC_CA_CERT | Users service gRPC CA certificates | "" |
| MF_JAEGER_URL | Jaeger server URL | http://jaeger:14268/api/traces |
| MF_SEND_TELEMETRY | Send telemetry to mainflux call home server | true |
| MF_CASSANDRA_READER_INSTANCE_ID | Cassandra Reader instance ID | "" |
Deployment
The service itself is distributed as Docker container. Check the cassandra-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 cassandra
make cassandra-reader
# copy binary to bin
make install
# Set the environment variables and run the service
MF_CASSANDRA_READER_LOG_LEVEL=[Cassandra Service log level] \
MF_CASSANDRA_READER_HTTP_HOST=[Cassandra Service HTTP host] \
MF_CASSANDRA_READER_HTTP_PORT=[Cassandra Service HTTP port] \
MF_CASSANDRA_READER_HTTP_SERVER_CERT=[Cassandra Service HTTP server cert] \
MF_CASSANDRA_READER_HTTP_SERVER_KEY=[Cassandra Service HTTP server key] \
MF_CASSANDRA_CLUSTER=[Cassandra cluster comma separated addresses] \
MF_CASSANDRA_KEYSPACE=[Cassandra keyspace name] \
MF_CASSANDRA_USER=[Cassandra DB username] \
MF_CASSANDRA_PASS=[Cassandra DB password] \
MF_CASSANDRA_PORT=[Cassandra DB port] \
MF_THINGS_AUTH_GRPC_URL=[Things service Auth gRPC URL] \
MF_THINGS_AUTH_GRPC_TIMEOUT=[Things service Auth gRPC request timeout in seconds] \
MF_THINGS_AUTH_GRPC_CLIENT_TLS=[Things service Auth gRPC TLS enabled] \
MF_THINGS_AUTH_GRPC_CA_CERTS=[Things service Auth gRPC CA certificates] \
MF_AUTH_GRPC_URL=[Users service gRPC URL] \
MF_AUTH_GRPC_TIMEOUT=[Users service gRPC request timeout in seconds] \
MF_AUTH_GRPC_CLIENT_TLS=[Users service gRPC TLS enabled] \
MF_AUTH_GRPC_CA_CERT=[Users service gRPC CA certificates] \
MF_JAEGER_URL=[Jaeger server URL] \
MF_SEND_TELEMETRY=[Send telemetry to mainflux call home server] \
MF_CASSANDRA_READER_INSTANCE_ID=[Cassandra Reader instance ID] \
$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.
Note: Cassandra Reader doesn't support searching substrings from string_value, due to inefficient searching as the current data model is not suitable for this type of queries.