IF features

This page simply lists the features of Impact Framework that are not plugins or CLI tools, along with a brief description, usage instruction and link to more detailed docs.

Typically these features are enabled using a piece of manifest config.

Aggregate

Aggregate collects and summarizes data across time or across components in your tree.

How to configure

Add the following config to your manifest (this example is for aggregating "cpu/utilization" values across both time and components):

aggregation:
  metrics:
    - 'cpu/utilization'
  type: both

Read more on aggregate

Explainer

The explainer lists the unit, description, aggregation method, and plugins of the parameter that is used in the manifest.

How to configure

You can toggle the explainer by adding the following config to your manifest:

explainer: true

You can override the parameter metadata provided in a plugin's source code by adding it to the plugin's initialize block, as follows:

explainer: true
plugins:
  'sum-carbon':
    path: 'builtin'
    method: Sum
    config:
      input-parameters:
        - carbon-operational
        - carbon-embodied
      output-parameter: carbon
    parameter-metadata:
      inputs:
        carbon-operational:
          description: "carbon emitted due to an application's execution"
          unit: 'gCO2eq'
          aggregation-method:
            time: sum
            component: sum,
        carbon-embodied:
          description: "carbon emitted during the production, distribution and disposal of a hardware component, scaled by the fraction of the component's lifespan being allocated to the application under investigation"
          unit: 'gCO2eq'
          aggregation-method:
            time: sum
            component: sum

Read more on explainer

Inline Arithmetic Expressions

Inline arithmetic expressions allow basic mathematical operations to be embedded directly within config parameters and inputs values in manifest files. This enables dynamic calculations using constants or input variables, eliminating the need for manual pre-calculation of parameters.

Supported Symbols and Operations:

• =: Indicates the start of an arithmetic expression.
• Supported operators: * (multiplication), + (addition), - (subtraction), / (division).

Syntax:

• To define an inline arithmetic expression, the string must start with an equal sign (=). For example:

  'input-parameter': '= 2 * carbon'
  This expression evaluates the multiplication of 2 by the value of the carbon parameter from the input.
• Arithmetic operations between two constants can also be defined without using the equal sign (=):

  coefficient: 2 * 2
  This expression evaluates the multiplication of 2 by 2 directly.
• If the parameter name contains symbols, it should be placed in the quotes. The expresion should look like:

  output-parameter: '= 2 * "carbon-product"'

Example:

config:
  'input-parameter': '= 2 * carbon'
  coefficient: 2 * 2
  'output-parameter': '= 2 * "carbon-product"'
---
inputs:
  - timestamp: 2023-08-06T00:00
    duration: 3600 * 60
    carbon: = 10 * "other-param
    other-param: 3

Plugin support

To enable inline arithmetic expressions in your plugin, specify it in your plugin’s definition function like this:

allowArithmeticExpressions: ['input-parameter'];

In the allowArithmeticExpressions array, list all parameters (whether in config, inputs, or outputs) that can contain arithmetic expressions. The calculations are handled internally (in the PluginFactory interface).

If your plugin doesn’t have specified parameters but has dynamic output parameters that should support evaluation, you can enable arithmeticExpressions with an empty array:

allowArithmeticExpressions: [];

To design your plugin with support for arithmetic expressions, you can use various utility functions.

• If your plugin's config parameters must be of type number, you can use the validateArithmeticExpression function from @grnsft/if-core/utils:

import {validateArithmeticExpression} from '@grnsft/if-core/utils';

// Plugin definition

configValidation: (config: ConfigParams) => {
    const configSchema = z.object({
      coefficient: z.preprocess(
        value => validateArithmeticExpression('coefficient', value, 'number'),
        z.number()
      ),
      'input-parameter': z.string().min(1),
      'output-parameter': z.string().min(1),
    });

    return validate<z.infer<typeof configSchema>>(
      configSchema as ZodType<any>,
      config
    );
  },

• If your config parameters contain arithmetic expressions like the following:

config:
  keep-existing: false
  from: = 4 * "if-size"
  to: 'if-repo-size'

But during implementation, you need to extract the pure parameter name (e.g., if-size), you can use the getParameterFromArithmeticExpression function:

import { getParameterFromArithmeticExpression } from '@grnsft/if-core/utils';

// Plugin definition

configValidation: (config: ConfigParams) => {
  const configSchema = z.object({
    'keep-existing': z.boolean(),
    from: z.string().min(1),
    to: z.string().min(1),
  });

  const extractedFrom = getParameterFromArithmeticExpression(config.from);
  const updatedConfig = config['keep-existing']
    ? config
    : { ...config, 'pure-from': extractedFrom };

  validate<z.infer<typeof configSchema>>(configSchema, updatedConfig);

  return updatedConfig;
};