feat(flagd-core): add bulk evaluation method (#1010)

Signed-off-by: Michael Beemer <beeme1mr@users.noreply.github.com>
Co-authored-by: Todd Baert <todd.baert@dynatrace.com>

libs/shared/flagd-core/src/lib/__snapshots__/flagd-core.spec.ts.snap

@@ -0,0 +1,111 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`flagd-core resolving falsy variant values should resolve all flags 1`] = `
+[
+  {
+    "flagKey": "myBoolFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": false,
+    "variant": "off",
+  },
+  {
+    "flagKey": "myStringFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": "",
+    "variant": "key1",
+  },
+  {
+    "flagKey": "myFloatFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": 0,
+    "variant": "zero",
+  },
+  {
+    "flagKey": "myIntFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": 0,
+    "variant": "zero",
+  },
+  {
+    "flagKey": "myObjectFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": {},
+    "variant": "object1",
+  },
+  {
+    "flagKey": "fibAlgo",
+    "flagMetadata": {},
+    "reason": "DEFAULT",
+    "value": "recursive",
+    "variant": "recursive",
+  },
+  {
+    "flagKey": "targetedFlag",
+    "flagMetadata": {},
+    "reason": "DEFAULT",
+    "value": "AAA",
+    "variant": "first",
+  },
+]
+`;
+
+exports[`flagd-core resolving truthy variant values should resolve all flags 1`] = `
+[
+  {
+    "flagKey": "myBoolFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": true,
+    "variant": "on",
+  },
+  {
+    "flagKey": "myStringFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": "val1",
+    "variant": "key1",
+  },
+  {
+    "flagKey": "myFloatFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": 1.23,
+    "variant": "one",
+  },
+  {
+    "flagKey": "myIntFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": 1,
+    "variant": "one",
+  },
+  {
+    "flagKey": "myObjectFlag",
+    "flagMetadata": {},
+    "reason": "STATIC",
+    "value": {
+      "key": "val",
+    },
+    "variant": "object1",
+  },
+  {
+    "flagKey": "fibAlgo",
+    "flagMetadata": {},
+    "reason": "DEFAULT",
+    "value": "recursive",
+    "variant": "recursive",
+  },
+  {
+    "flagKey": "targetedFlag",
+    "flagMetadata": {},
+    "reason": "DEFAULT",
+    "value": "AAA",
+    "variant": "first",
+  },
+]
+`;

libs/shared/flagd-core/src/lib/flagd-core.spec.ts

@@ -38,6 +38,11 @@ describe('flagd-core resolving', () => {
       expect(resolved.reason).toBe(StandardResolutionReasons.STATIC);
       expect(resolved.variant).toBe('object1');
     });
+
+    it('should resolve all flags', () => {
+      const resolved = core.resolveAll({}, console);
+      expect(resolved).toMatchSnapshot();
+    });
   });
 
   describe('falsy variant values', () => {
@@ -76,6 +81,11 @@ describe('flagd-core resolving', () => {
       expect(resolved.reason).toBe(StandardResolutionReasons.STATIC);
       expect(resolved.variant).toBe('object1');
     });
+
+    it('should resolve all flags', () => {
+      const resolved = core.resolveAll({}, console);
+      expect(resolved).toMatchSnapshot();
+    });
   });
 });
 
@@ -157,6 +167,12 @@ describe('flagd-core validations', () => {
   it('should validate variant', () => {
     expect(() => core.resolveStringEvaluation('myStringFlag', 'hello', {}, console)).toThrow(TypeMismatchError);
   });
+
+  it('should only resolve enabled flags', () => {
+    const resolved = core.resolveAll({}, console);
+    expect(resolved).toHaveLength(1);
+    expect(resolved[0]).toHaveProperty('flagKey', 'myStringFlag');
+  });
 });
 
 describe('flagd-core common flag definitions', () => {

libs/shared/flagd-core/src/lib/flagd-core.ts

@@ -12,6 +12,7 @@ import {
   Logger,
   SafeLogger,
   DefaultLogger,
+  EvaluationDetails,
 } from '@openfeature/core';
 import { Targeting } from './targeting/targeting';
 import { FeatureFlag } from './feature-flag';
@@ -121,6 +122,32 @@ export class FlagdCore implements Storage {
     return this.resolve('object', flagKey, defaultValue, evalCtx, logger);
   }
 
+  /**
+   * Resolve the flag evaluation for all enabled flags.
+   * @param evalCtx - The evaluation context to be used for targeting.
+   * @param logger - The logger to be used to troubleshoot targeting errors. Overrides the default logger.
+   * @returns - The list of evaluation details for all enabled flags.
+   */
+  resolveAll(evalCtx?: EvaluationContext, logger?: Logger): EvaluationDetails<JsonValue>[] {
+    const values: EvaluationDetails<JsonValue>[] = [];
+    for (const [key, flag] of this.getFlags()) {
+      try {
+        if (flag.state === 'DISABLED') {
+          continue;
+        }
+        const result = this.evaluate(key, evalCtx, logger);
+        values.push({
+          ...result,
+          flagKey: key,
+          flagMetadata: Object.freeze(result.flagMetadata ?? {}),
+        });
+      } catch (e) {
+        this._logger.error(`Error resolving flag ${key}: ${(e as Error).message}`);
+      }
+    }
+    return values;
+  }
+
   /**
    * Resolves the value of a flag based on the specified type type.
    * @template T - The type of the flag value.
@@ -141,6 +168,25 @@ export class FlagdCore implements Storage {
     evalCtx: EvaluationContext = {},
     logger?: Logger,
   ): ResolutionDetails<T> {
+    const { value, reason, variant } = this.evaluate(flagKey, evalCtx, logger);
+
+    if (typeof value !== type) {
+      throw new TypeMismatchError(
+        `Evaluated type of the flag ${flagKey} does not match. Expected ${type}, got ${typeof value}`,
+      );
+    }
+
+    return {
+      value: value as T,
+      reason,
+      variant,
+    };
+  }
+
+  /**
+   * Evaluates the flag and returns the resolved value regardless of the type.
+   */
+  private evaluate(flagKey: string, evalCtx: EvaluationContext = {}, logger?: Logger): ResolutionDetails<JsonValue> {
     logger ??= this._logger;
     const flag = this._storage.getFlag(flagKey);
     // flag exist check
@@ -188,14 +234,8 @@ export class FlagdCore implements Storage {
       throw new GeneralError(`Variant ${variant} not found in flag with key ${flagKey}`);
     }
 
-    if (typeof resolvedVariant !== type) {
-      throw new TypeMismatchError(
-        `Evaluated type of the flag ${flagKey} does not match. Expected ${type}, got ${typeof resolvedVariant}`,
-      );
-    }
-
     return {
-      value: resolvedVariant as T,
+      value: resolvedVariant,
       reason,
       variant,
     };