@hyperledger/cactus-plugin-keychain-memory

@hyperledger/cactus-plugin-keychain-memory

Prometheus Exporter

This class creates a prometheus exporter, which scrapes the transactions (total transaction count) for the use cases incorporating the use of Keychain memory plugin.

Usage

The prometheus exporter object is initialized in the PluginKeychainMemory class constructor itself, so instantiating the object of the PluginKeychainMemory class, gives access to the exporter object. You can also initialize the prometheus exporter object seperately and then pass it to the IPluginKeychainMemoryOptions interface for PluginKeychainMemory constructor.

getPrometheusMetricsV1 function returns the prometheus exporter metrics, currently displaying the total key count, which currently updates everytime a new key is added/removed from the list of total keys.

Prometheus Integration

To use Prometheus with this exporter make sure to install Prometheus main component. Once Prometheus is setup, the corresponding scrape_config needs to be added to the prometheus.yml

- job_name: 'keychain_memory_exporter'
  metrics_path: api/v1/plugins/@hyperledger/cactus-plugin-keychain-memory/get-prometheus-exporter-metrics
  scrape_interval: 5s
  static_configs:
    - targets: ['{host}:{port}']

Here the host:port is where the prometheus exporter metrics are exposed. The test cases (For example, packages/cactus-plugin-keychain-memory/src/test/typescript/unit/plugin-keychain-memory.test.ts) exposes it over 0.0.0.0 and a random port(). The random port can be found in the running logs of the test case and looks like (42379 in the below mentioned URL) Metrics URL: http://0.0.0.0:42379/api/v1/plugins/@hyperledger/cactus-plugin-keychain-memory/get-prometheus-exporter-metrics

Once edited, you can start the prometheus service by referencing the above edited prometheus.yml file. On the prometheus graphical interface (defaulted to http://localhost:9090), choose Graph from the menu bar, then select the Console tab. From the Insert metric at cursor drop down, select cactus_keychain_memory_total_key_count and click execute

Helper code

response.type.ts

This file contains the various responses of the metrics.

data-fetcher.ts

This file contains functions encasing the logic to process the data points

metrics.ts

This file lists all the prometheus metrics and what they are used for.