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Query Agent

C++ server that performs Pattern Matching queries.

Build

To build the Query Agent, run the following command from the project root:

make build-all

This will generate the binaries for all components in the das/src/bin directory.

Prerequisites

Before running the Query Agent, ensure that the following environment variables are properly exported:

  • MongoDB

    • DAS_MONGODB_HOSTNAME
    • DAS_MONGODB_PORT
    • DAS_MONGODB_USERNAME
    • DAS_MONGODB_PASSWORD

  • Redis

    • DAS_REDIS_HOSTNAME
    • DAS_REDIS_PORT
    • DAS_USE_REDIS_CLUSTER (set to true if using Redis Cluster)

  • Attention Broker

    • DAS_ATTENTION_BROKER_ADDRESS (optional, defaults to localhost if not provided)
    • DAS_ATTENTION_BROKER_PORT (optional, defaults to 37007 if not provided)

You can export these variables by including them in your shell configuration file or by running:

export DAS_MONGODB_HOSTNAME="localhost"
export DAS_MONGODB_PORT="27017"
export DAS_MONGODB_USERNAME="your-username"
export DAS_MONGODB_PASSWORD="your-password"
export DAS_REDIS_HOSTNAME="localhost"
export DAS_REDIS_PORT="6379"
export DAS_USE_REDIS_CLUSTER=false
export DAS_ATTENTION_BROKER_ADDRESS="localhost"
export DAS_ATTENTION_BROKER_PORT="37007"

Before running the Query Agent, you need to start the Attention Broker. For more information on how to set up and run the Attention Broker, refer to attention-broker.md.

Usage

You might not be able to execute the binary directly from your machine. To simplify this process, we provide a command to run the service inside a container:

  • Run the Query Agent using the following command: 
    make run-query-agent
  • The default port for the Attention Broker is 35700.
  • If successful, you should see a message like this: 
    Connected to (NON-CLUSTER) Redis at localhost:6379
Connected to MongoDB at localhost:27017
Connected to AttentionBroker at localhost:37007
SynchronousGRPC listening on localhost:35700
#############################     REQUEST QUEUE EMPTY     ##################################