feat(src): generic exponent plugin

Signed-off-by: Paz Barda <paz.barda@intel.com>

README.md

@@ -21,6 +21,7 @@
 - [SCI-O](./src/lib/sci-o/README.md)
 - [Shell](./src/lib/shell/README.md)
 - [Sum](./src/lib/sum/README.md)
+- [Exponent](./src/lib/exponent/README.md)
 - [TDP Finder](./src/lib/tdp-finder/README.md)
 
 ## Contributing

src/__tests__/unit/lib/exponent/index.test.ts

@@ -0,0 +1,118 @@
+import {Exponent} from '../../../../lib';
+
+import {ERRORS} from '../../../../util/errors';
+
+const {InputValidationError} = ERRORS;
+
+describe('lib/exponent: ', () => {
+  describe('Exponent: ', () => {
+    const globalConfig = {
+      'input-parameter': 'energy/base',
+      exponent: 3,
+      'output-parameter': 'energy',
+    };
+    const exponent = Exponent(globalConfig);
+
+    describe('init: ', () => {
+      it('successfully initalized.', () => {
+        expect(exponent).toHaveProperty('metadata');
+        expect(exponent).toHaveProperty('execute');
+      });
+    });
+
+    describe('execute(): ', () => {
+      it('successfully applies Exponent strategy to given input.', async () => {
+        expect.assertions(1);
+
+        const expectedResult = [
+          {
+            duration: 3600,
+            'energy/base': 2,
+            energy: 8,
+            timestamp: '2021-01-01T00:00:00Z',
+          },
+        ];
+
+        const result = await exponent.execute([
+          {
+            duration: 3600,
+            'energy/base': 2,
+            timestamp: '2021-01-01T00:00:00Z',
+          },
+        ]);
+
+        expect(result).toStrictEqual(expectedResult);
+      });
+
+      it('throws an error on missing params in input.', async () => {
+        const expectedMessage =
+          'Exponent: energy/base is missing from the input array.';
+
+        expect.assertions(1);
+
+        try {
+          await exponent.execute([
+            {
+              duration: 3600,
+              timestamp: '2021-01-01T00:00:00Z',
+            },
+          ]);
+        } catch (error) {
+          expect(error).toStrictEqual(
+            new InputValidationError(expectedMessage)
+          );
+        }
+      });
+
+      it('throws an error on input param value not numeric.', async () => {
+        const expectedMessage = 'Exponent: i-am-not-a-number is not numeric.';
+
+        expect.assertions(1);
+
+        try {
+          await exponent.execute([
+            {
+              duration: 3600,
+              'energy/base': 'i-am-not-a-number',
+              timestamp: '2021-01-01T00:00:00Z',
+            },
+          ]);
+        } catch (error) {
+          expect(error).toStrictEqual(
+            new InputValidationError(expectedMessage)
+          );
+        }
+      });
+
+      it('returns a result with input params not related to energy.', async () => {
+        expect.assertions(1);
+        const newConfig = {
+          'input-parameter': 'carbon/base',
+          exponent: 4,
+          'output-parameter': 'carbon',
+        };
+        const exponent = Exponent(newConfig);
+
+        const data = [
+          {
+            duration: 3600,
+            timestamp: '2021-01-01T00:00:00Z',
+            'carbon/base': 2,
+          },
+        ];
+        const response = await exponent.execute(data);
+
+        const expectedResult = [
+          {
+            duration: 3600,
+            'carbon/base': 2,
+            carbon: 16,
+            timestamp: '2021-01-01T00:00:00Z',
+          },
+        ];
+
+        expect(response).toEqual(expectedResult);
+      });
+    });
+  });
+});

src/lib/exponent/README.md

@@ -0,0 +1,98 @@
+# Exponent
+
+`exponent` is a generic plugin for calculating exponent of an input param (as base) and another (as the exponent) in an `input` array.
+
+You provide the names of the values you want to use for the exponent calculation, and a name to use to add the exponent result to the output array.
+
+For example, you use `cpu/energy` as base and `network/energy` as and name the result `energy`. `energy` would then be added to every observation in your input array as `cpu/energy` raised by the exponent `network/energy`.
+
+## Parameters
+
+### Plugin config
+
+Three parameters are required in global config: `input-parameter`, `exponent` and `output-parameter`.
+
+`input-parameter`: a string defining the base. Must match an existing key in the `inputs` array
+`exponent`: a number defining the exponent.
+`output-parameter`: a string defining the name to use to add the result of the exponent to the output array.
+
+### Inputs
+
+`input-parameter` and `exponent` must be available in the input array.
+
+## Returns
+
+- `output-parameter`: `input-parameter` raised by `exponent` with the parameter name defined by `output-parameter` in global config.
+
+## Calculation
+
+```pseudocode
+output = input ^ exponent
+```
+
+## Implementation
+
+To run the plugin, you must first create an instance of `Exponent`. Then, you can call `execute()`.
+
+```typescript
+import {Exponent} from '@grnsft/if-plugins';
+
+const config = {
+  inputParameter: ['cpu/energy'],
+  exponent: 2
+  outputParameter: 'energy',
+};
+
+const exponent = Exponent(config);
+const result = await exponent.execute([
+  {
+    duration: 3600,
+    timestamp: '2021-01-01T00:00:00Z',
+    'cpu/energy': 0.1,
+    'energy': 0.01,
+  },
+]);
+```
+
+## Example manifest
+
+IF users will typically call the plugin as part of a pipeline defined in a manifest file. In this case, instantiating the plugin is handled by and does not have to be done explicitly by the user. The following is an example manifest that calls `exponent`:
+
+```yaml
+name: exponent demo
+description:
+tags:
+initialize:
+  outputs:
+    - yaml
+  plugins:
+    exponent:
+      method: Exponent
+      path: '@grnsft/if-plugins'
+      global-config:
+        input-parameter: 'cpu/energy'
+        exponent: 2
+        output-parameter: 'energy'
+tree:
+  children:
+    child:
+      pipeline:
+        - exponent
+      config:
+        exponent:
+      inputs:
+        - timestamp: 2023-08-06T00:00
+          duration: 3600
+          cpu/energy: 0.001
+          network/energy: 0.001
+```
+
+You can run this example by saving it as `./manifests/examples/test/exponent.yml` and executing the following command from the project root:
+
+```sh
+npm i -g @grnsft/if
+npm i -g @grnsft/if-plugins
+ie --manifest ./manifests/examples/test/exponent.yml --output ./examples/outputs/exponent.yml
+```
+
+The results will be saved to a new `yaml` file in `./examples/outputs`.

src/lib/exponent/index.ts

@@ -0,0 +1,98 @@
+import {z} from 'zod';
+
+import {ERRORS} from '../../util/errors';
+import {buildErrorMessage} from '../../util/helpers';
+import {validate} from '../../util/validations';
+
+import {PluginInterface} from '../../interfaces';
+import {PluginParams} from '../../types/common';
+import {ExponentConfig} from './types';
+
+const {InputValidationError} = ERRORS;
+
+export const Exponent = (globalConfig: ExponentConfig): PluginInterface => {
+  const errorBuilder = buildErrorMessage(Exponent.name);
+  const metadata = {
+    kind: 'execute',
+  };
+
+  /**
+   * Checks global config value are valid.
+   */
+  const validateGlobalConfig = () => {
+    const globalConfigSchema = z.object({
+      'input-parameter': z.string().min(1),
+      exponent: z.number().min(1),
+      'output-parameter': z.string().min(1),
+    });
+
+    return validate<z.infer<typeof globalConfigSchema>>(
+      globalConfigSchema,
+      globalConfig
+    );
+  };
+
+  /**
+   * Checks for required fields in input.
+   */
+  const validateSingleInput = (input: PluginParams, inputParameter: string) => {
+    validateParamExists(input, inputParameter);
+    validateNumericString(input[inputParameter]);
+  };
+
+  const validateParamExists = (input: PluginParams, param: string) => {
+    if (input[param] === undefined) {
+      throw new InputValidationError(
+        errorBuilder({
+          message: `${param} is missing from the input array`,
+        })
+      );
+    }
+  };
+
+  const validateNumericString = (str: string) => {
+    if (typeof str !== 'number') {
+      throw new InputValidationError(
+        errorBuilder({
+          message: `${str} is not numeric`,
+        })
+      );
+    }
+  };
+
+  /**
+   * Calculate the input param raised by to the power of the given exponent.
+   */
+  const execute = async (inputs: PluginParams[]): Promise<PluginParams[]> => {
+    const {
+      'input-parameter': inputParameter,
+      exponent: exponent,
+      'output-parameter': outputParameter,
+    } = validateGlobalConfig();
+    return inputs.map(input => {
+      validateSingleInput(input, inputParameter);
+
+      return {
+        ...input,
+        [outputParameter]: calculateExponent(input, inputParameter, exponent),
+      };
+    });
+  };
+
+  /**
+   * Calculates the input param raised by the power of a given exponent.
+   */
+  const calculateExponent = (
+    input: PluginParams,
+    inputParameter: string,
+    exponent: number
+  ) => {
+    const base = input[inputParameter];
+    return Math.pow(base, exponent);
+  };
+
+  return {
+    metadata,
+    execute,
+  };
+};

src/lib/exponent/types.ts

@@ -0,0 +1,5 @@
+export type ExponentConfig = {
+  'input-parameter': string;
+  exponent: number;
+  'output-parameter': string;
+};

src/lib/index.ts

@@ -14,3 +14,4 @@ export {Sum} from './sum';
 export {Coefficient} from './coefficient';
 export {Divide} from './divide';
 export {Regex} from './regex';
+export {Exponent} from './exponent';