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feat(parameters): ability to set maxAge and decrypt via environment variables (#1384)
* feat: add env variables config for SSM/Parameters * tests: added unit tests * docs: updated docs with new env vars
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‎docs/index.md‎

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@@ -293,20 +293,22 @@ Core utilities such as Tracing, Logging, and Metrics will be available across al
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???+ info
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Explicit parameters take precedence over environment variables
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| Environment variable | Description | Utility | Default |
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| -------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ------------------------- | ------------------- |
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| **POWERTOOLS_SERVICE_NAME** | Sets service name used for tracing namespace, metrics dimension and structured logging | All | `service_undefined` |
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| **POWERTOOLS_METRICS_NAMESPACE** | Sets namespace used for metrics | [Metrics](./core/metrics) | `default_namespace` |
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| **POWERTOOLS_TRACE_ENABLED** | Explicitly disables tracing | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_RESPONSE** | Captures Lambda or method return as metadata. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_ERROR** | Captures Lambda or method exception as metadata. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_HTTPS_REQUESTS** | Captures HTTP(s) requests as segments. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_LOGGER_LOG_EVENT** | Logs incoming event | [Logger](./core/logger) | `false` |
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| **POWERTOOLS_LOGGER_SAMPLE_RATE** | Debug log sampling | [Logger](./core/logger) | `0` |
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| **POWERTOOLS_DEV** | Increase JSON indentation to ease debugging when running functions locally or in a non-production environment | [Logger](./core/logger) | `false` |
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| **LOG_LEVEL** | Sets logging level | [Logger](./core/logger) | `INFO` |
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Each Utility page provides information on example values and allowed values
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| Environment variable | Description | Utility | Default |
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| -------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ------------------------------------ | ------------------- |
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| **POWERTOOLS_SERVICE_NAME** | Sets service name used for tracing namespace, metrics dimension and structured logging | All | `service_undefined` |
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| **POWERTOOLS_METRICS_NAMESPACE** | Sets namespace used for metrics | [Metrics](./core/metrics) | `default_namespace` |
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| **POWERTOOLS_TRACE_ENABLED** | Explicitly disables tracing | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_RESPONSE** | Captures Lambda or method return as metadata. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_ERROR** | Captures Lambda or method exception as metadata. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_TRACER_CAPTURE_HTTPS_REQUESTS** | Captures HTTP(s) requests as segments. | [Tracer](./core/tracer) | `true` |
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| **POWERTOOLS_LOGGER_LOG_EVENT** | Logs incoming event | [Logger](./core/logger) | `false` |
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| **POWERTOOLS_LOGGER_SAMPLE_RATE** | Debug log sampling | [Logger](./core/logger) | `0` |
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| **POWERTOOLS_DEV** | Increase JSON indentation to ease debugging when running functions locally or in a non-production environment | [Logger](./core/logger) | `false` |
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| **LOG_LEVEL** | Sets logging level | [Logger](./core/logger) | `INFO` |
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| **POWERTOOLS_PARAMETERS_MAX_AGE** | Adjust how long values are kept in cache (in seconds) | [Parameters](./utilities/parameters) | `5` |
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| **POWERTOOLS_PARAMETERS_SSM_DECRYPT** | Sets whether to decrypt or not values retrieved from AWS Systems Manager Parameters Store | [Parameters](./utilities/parameters) | `false` |
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Each Utility page provides information on example values and allowed values.
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## Tenets
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‎docs/snippets/parameters/adjustingCacheTTL.ts‎

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@@ -3,12 +3,12 @@ import { SSMProvider } from '@aws-lambda-powertools/parameters/ssm';
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const parametersProvider = new SSMProvider();
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export const handler = async (): Promise<void> => {
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// Retrieve a single parameter
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const parameter = await parametersProvider.get('/my/parameter', { maxAge: 60 }); // 1 minute
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// Retrieve a single parameter and cache it for 1 minute
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const parameter = await parametersProvider.get('/my/parameter', { maxAge: 60 }); // (1)
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console.log(parameter);
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// Retrieve multiple parameters from a path prefix
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const parameters = await parametersProvider.getMultiple('/my/path/prefix', { maxAge: 120 }); // 2 minutes
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// Retrieve multiple parameters from a path prefix and cache them for 2 minutes
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const parameters = await parametersProvider.getMultiple('/my/path/prefix', { maxAge: 120 });
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for (const [ key, value ] of Object.entries(parameters || {})) {
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console.log(`${key}: ${value}`);
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}

‎docs/snippets/parameters/ssmProviderDecryptAndRecursive.ts‎

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@@ -3,7 +3,7 @@ import { SSMProvider } from '@aws-lambda-powertools/parameters/ssm';
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const parametersProvider = new SSMProvider();
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export const handler = async (): Promise<void> => {
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const decryptedValue = await parametersProvider.get('/my/encrypted/parameter', { decrypt: true });
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const decryptedValue = await parametersProvider.get('/my/encrypted/parameter', { decrypt: true }); // (1)
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console.log(decryptedValue);
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const noRecursiveValues = await parametersProvider.getMultiple('/my/path/prefix', { recursive: false });

‎docs/utilities/parameters.md‎

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### Adjusting cache TTL
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???+ tip
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`maxAge` parameter is also available in high level functions like `getParameter`, `getSecret`, etc.
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By default, the provider will cache parameters retrieved in-memory for 5 seconds.
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You can adjust how long values should be kept in cache by using the param `maxAge`, when using `get()` or `getMultiple()` methods across all providers.
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???+ tip
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If you want to set the same TTL for all parameters, you can set the `POWERTOOLS_PARAMETERS_MAX_AGE` environment variable. **This will override the default TTL of 5 seconds but can be overridden by the `maxAge` parameter**.
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```typescript hl_lines="7 11" title="Caching parameters values in memory for longer than 5 seconds"
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--8<-- "docs/snippets/parameters/adjustingCacheTTL.ts"
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```
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1. Options passed to `get()`, `getMultiple()`, and `getParametersByName()` will override the values set in `POWERTOOLS_PARAMETERS_MAX_AGE` environment variable.
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The `maxAge` parameter is also available in high level functions like `getParameter`, `getSecret`, etc.
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### Always fetching the latest
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If you'd like to always ensure you fetch the latest parameter from the store regardless if already available in cache, use the `forceFetch` parameter.
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| **decrypt** | `false` | Will automatically decrypt the parameter (see required [IAM Permissions](#iam-permissions)). |
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| **recursive** | `true` | For `getMultiple()` only, will fetch all parameter values recursively based on a path prefix. |
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If you want to always decrypt parameters, you can set the `POWERTOOLS_PARAMETERS_SSM_DECRYPT=true` environment variable. **This will override the default value of `false` but can be overridden by the `decrypt` parameter**.
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```typescript hl_lines="6 9" title="Example with get() and getMultiple()"
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--8<-- "docs/snippets/parameters/ssmProviderDecryptAndRecursive.ts"
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```
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1. Options passed to `get()`, `getMultiple()`, and `getParametersByName()` will override the values set in `POWERTOOLS_PARAMETERS_SSM_DECRYPT` environment variable.
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#### SecretsProvider
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```typescript hl_lines="4-5" title="Example with SecretsProvider for further extensibility"

‎package-lock.json‎

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‎packages/commons/src/config/ConfigService.ts‎

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*/
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public abstract getServiceName(): string;
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/**
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* It returns the value of the _X_AMZN_TRACE_ID environment variable.
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*
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* The AWS X-Ray Trace data available in the environment variable has this format:
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* `Root=1-5759e988-bd862e3fe1be46a994272793;Parent=557abcec3ee5a047;Sampled=1`,
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*
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* The actual Trace ID is: `1-5759e988-bd862e3fe1be46a994272793`.
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*
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* @returns {string|undefined}
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*/
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public abstract getXrayTraceId(): string | undefined;
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/**
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* It returns true if the string value represents a boolean true value.
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*
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* @param {string} value
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* @returns boolean
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*/
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public abstract isValueTrue(value: string): boolean;
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}
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export {

‎packages/commons/src/config/EnvironmentVariablesService.ts‎

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return xRayTraceId.split(';')[0].replace('Root=', '');
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}
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/**
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* It returns true if the string value represents a boolean true value.
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*
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* @param {string} value
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* @returns boolean
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*/
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public isValueTrue(value: string): boolean {
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const truthyValues: string[] = [ '1', 'y', 'yes', 't', 'true', 'on' ];
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return truthyValues.includes(value.toLowerCase());
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}
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export {

‎packages/commons/tests/unit/config/EnvironmentVariablesService.test.ts‎

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});
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describe('Method: isValueTrue', () => {
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const valuesToTest: Array<Array<string | boolean>> = [
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[ '1', true ],
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[ 'y', true ],
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[ 'yes', true ],
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[ 't', true ],
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[ 'TRUE', true ],
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[ 'on', true ],
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[ '', false ],
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[ 'false', false ],
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[ 'fasle', false ],
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[ 'somethingsilly', false ],
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[ '0', false ]
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];
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test.each(valuesToTest)('it takes string "%s" and returns %s', (input, output) => {
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// Prepare
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const service = new EnvironmentVariablesService();
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// Act
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const value = service.isValueTrue(input as string);
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// Assess
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expect(value).toBe(output);
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});
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});
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});

‎packages/logger/src/config/EnvironmentVariablesService.ts‎

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return this.isValueTrue(value);
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}
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* It returns true if the string value represents a boolean true value.
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‎packages/logger/tests/unit/config/EnvironmentVariablesService.test.ts‎

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describe('Method: isValueTrue', () => {
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const valuesToTest: Array<Array<string | boolean>> = [
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[ '1', true ],
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[ 'y', true ],
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[ 'yes', true ],
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[ 't', true ],
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[ 'TRUE', true ],
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[ 'on', true ],
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[ '', false ],
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[ 'false', false ],
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[ 'fasle', false ],
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[ '0', false ]
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];
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test.each(valuesToTest)('it takes string "%s" and returns %s', (input, output) => {
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// Prepare
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const service = new EnvironmentVariablesService();
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// Act
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const value = service.isValueTrue(input as string);
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expect(value).toBe(output);
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});
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});
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});

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