David Culbreth
9072c93fe4
Includes: - 3 Node.js actions (hello, http_example, read_counter) - 1 counter trigger type - 1 counter sensor (Node.js, keystore-backed, per-rule state) - 1 example rule (count_and_log) - package.json with node-fetch and amqplib - README with full usage documentation
76 lines
2.2 KiB
YAML
76 lines
2.2 KiB
YAML
# Counter Sensor
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# Emits incrementing counter events, storing state in the Attune keystore
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#
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# Each subscribing rule gets its own independent counter, keyed by rule ref.
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# The sensor listens for rule lifecycle events via RabbitMQ and manages
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# per-rule timer loops that emit one event per second (configurable).
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ref: nodejs_example.counter_sensor
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label: "Counter Sensor"
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description: "Emits periodic counter events with per-rule state stored in the Attune keystore"
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enabled: true
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# Sensor runner type
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runner_type: nodejs
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# Entry point for sensor execution
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entry_point: counter_sensor.js
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# Trigger types this sensor monitors
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trigger_types:
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- nodejs_example.counter
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# Sensor configuration schema
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parameters:
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type: object
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properties:
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default_interval_seconds:
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type: integer
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description: "Default interval between counter emissions (in seconds)"
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default: 1
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minimum: 1
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maximum: 3600
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key_prefix:
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type: string
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description: "Prefix for counter keys in the Attune keystore"
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default: "nodejs_example.counter"
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# Poll interval (how often the sensor checks for events)
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poll_interval: 1
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# Tags for categorization
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tags:
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- counter
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- nodejs
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- example
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- keystore
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# Metadata
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meta:
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builtin: false
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system: false
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description: |
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The counter sensor demonstrates a stateful Node.js sensor that integrates
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with the Attune keystore. It maintains a separate monotonically-increasing
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counter for each subscribing rule, persisting the value in the keystore
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so that counters survive sensor restarts.
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Features exercised:
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- Node.js sensor lifecycle (startup, rule subscription, shutdown)
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- RabbitMQ integration (amqplib) for rule lifecycle events
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- Attune keystore API for persistent state (GET/PUT/POST /api/v1/keys)
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- Per-rule scoped state via keystore key naming
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- Periodic event emission via POST /events API
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- Graceful shutdown with timer cleanup
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# Documentation
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examples:
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- description: "Counter firing every second (default)"
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trigger_type: nodejs_example.counter
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trigger_config: {}
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- description: "Counter firing every 5 seconds"
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trigger_type: nodejs_example.counter
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trigger_config:
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interval_seconds: 5
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