fix(api-logs,sdk-logs): allow AnyValue attributes for logs and handle circular references

experimental/CHANGELOG.md

@@ -20,6 +20,7 @@ For notes on migrating to 2.x / 0.200.x see [the upgrade guide](doc/upgrade-to-2
   * user-facing: `LogRecord` class is now not exported anymore. A newly exported interface `SdkLogRecord` is used in its place.
 * refactor: Removed `api-events` and `sdk-events` [#5737](https://github.com/open-telemetry/opentelemetry-js/pull/5737) @svetlanabrennan
 * chore: Regenerated certs [#5752](https://github.com/open-telemetry/opentelemetry-js/pull/5752) @svetlanabrennan
+* fix(api-logs,sdk-logs): allow AnyValue attributes for logs and handle circular references [#5765](https://github.com/open-telemetry/opentelemetry-js/pull/5765) @alec2435
 
 ## 0.202.0
 

experimental/packages/api-logs/src/index.ts

@@ -20,6 +20,7 @@ export { SeverityNumber } from './types/LogRecord';
 export type { LogAttributes, LogBody, LogRecord } from './types/LogRecord';
 export type { LoggerOptions } from './types/LoggerOptions';
 export type { AnyValue, AnyValueMap } from './types/AnyValue';
+export { isLogAttributeValue } from './utils/validation';
 export { NOOP_LOGGER, NoopLogger } from './NoopLogger';
 export { NOOP_LOGGER_PROVIDER, NoopLoggerProvider } from './NoopLoggerProvider';
 export { ProxyLogger } from './ProxyLogger';

experimental/packages/api-logs/src/utils/validation.ts

@@ -0,0 +1,77 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AnyValue } from '../types/AnyValue';
+
+/**
+ * Validates if a value is a valid AnyValue for Log Attributes according to OpenTelemetry spec.
+ * Log Attributes support a superset of standard Attributes and must support:
+ * - Scalar values: string, boolean, signed 64 bit integer, or double precision floating point
+ * - Byte arrays (Uint8Array)
+ * - Arrays of any values (heterogeneous arrays allowed)
+ * - Maps from string to any value (nested objects)
+ * - Empty values (null/undefined)
+ * 
+ * @param val - The value to validate
+ * @returns true if the value is a valid AnyValue, false otherwise
+ */
+export function isLogAttributeValue(val: unknown): val is AnyValue {
+  return isLogAttributeValueInternal(val, new WeakSet());
+}
+
+function isLogAttributeValueInternal(val: unknown, visited: WeakSet<object>): val is AnyValue {
+  // null and undefined are explicitly allowed
+  if (val == null) {
+    return true;
+  }
+
+  // Scalar values
+  if (typeof val === 'string' || typeof val === 'number' || typeof val === 'boolean') {
+    return true;
+  }
+
+  // Byte arrays
+  if (val instanceof Uint8Array) {
+    return true;
+  }
+
+  // For objects and arrays, check for circular references
+  if (typeof val === 'object') {
+    if (visited.has(val as object)) {
+      // Circular reference detected - reject it
+      return false;
+    }
+    visited.add(val as object);
+
+    // Arrays (can contain any AnyValue, including heterogeneous)
+    if (Array.isArray(val)) {
+      return val.every(item => isLogAttributeValueInternal(item, visited));
+    }
+
+    // Only accept plain objects (not built-in objects like Date, RegExp, Error, etc.)
+    // Check if it's a plain object by verifying its constructor is Object or it has no constructor
+    const obj = val as Record<string, unknown>;
+    if (obj.constructor !== Object && obj.constructor !== undefined) {
+      return false;
+    }
+
+    // Objects/Maps (including empty objects)
+    // All object properties must be valid AnyValues
+    return Object.values(obj).every(item => isLogAttributeValueInternal(item, visited));
+  }
+
+  return false;
+} 

experimental/packages/api-logs/test/common/utils/validation.test.ts

@@ -0,0 +1,255 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as assert from 'assert';
+import { isLogAttributeValue } from '../../../src/utils/validation';
+
+describe('isLogAttributeValue', () => {
+  describe('should accept scalar values', () => {
+    it('should accept strings', () => {
+      assert.strictEqual(isLogAttributeValue('test'), true);
+      assert.strictEqual(isLogAttributeValue(''), true);
+      assert.strictEqual(isLogAttributeValue('multi\nline'), true);
+      assert.strictEqual(isLogAttributeValue('unicode: 🎉'), true);
+    });
+
+    it('should accept numbers', () => {
+      assert.strictEqual(isLogAttributeValue(42), true);
+      assert.strictEqual(isLogAttributeValue(0), true);
+      assert.strictEqual(isLogAttributeValue(-123), true);
+      assert.strictEqual(isLogAttributeValue(3.14159), true);
+      assert.strictEqual(isLogAttributeValue(Number.MAX_SAFE_INTEGER), true);
+      assert.strictEqual(isLogAttributeValue(Number.MIN_SAFE_INTEGER), true);
+      assert.strictEqual(isLogAttributeValue(Infinity), true);
+      assert.strictEqual(isLogAttributeValue(-Infinity), true);
+      assert.strictEqual(isLogAttributeValue(NaN), true);
+    });
+
+    it('should accept booleans', () => {
+      assert.strictEqual(isLogAttributeValue(true), true);
+      assert.strictEqual(isLogAttributeValue(false), true);
+    });
+  });
+
+  describe('should accept null and undefined values', () => {
+    it('should accept null', () => {
+      assert.strictEqual(isLogAttributeValue(null), true);
+    });
+
+    it('should accept undefined', () => {
+      assert.strictEqual(isLogAttributeValue(undefined), true);
+    });
+  });
+
+  describe('should accept byte arrays', () => {
+    it('should accept Uint8Array', () => {
+      assert.strictEqual(isLogAttributeValue(new Uint8Array([1, 2, 3])), true);
+      assert.strictEqual(isLogAttributeValue(new Uint8Array(0)), true);
+      assert.strictEqual(isLogAttributeValue(new Uint8Array([255, 0, 128])), true);
+    });
+  });
+
+  describe('should accept arrays', () => {
+    it('should accept homogeneous arrays', () => {
+      assert.strictEqual(isLogAttributeValue(['a', 'b', 'c']), true);
+      assert.strictEqual(isLogAttributeValue([1, 2, 3]), true);
+      assert.strictEqual(isLogAttributeValue([true, false]), true);
+    });
+
+    it('should accept heterogeneous arrays', () => {
+      assert.strictEqual(isLogAttributeValue(['string', 42, true]), true);
+      assert.strictEqual(isLogAttributeValue([null, undefined, 'test']), true);
+      assert.strictEqual(isLogAttributeValue(['test', new Uint8Array([1, 2])]), true);
+    });
+
+    it('should accept nested arrays', () => {
+      assert.strictEqual(isLogAttributeValue([['a', 'b'], [1, 2]]), true);
+      assert.strictEqual(isLogAttributeValue([[1, 2, 3], ['nested', 'array']]), true);
+    });
+
+    it('should accept arrays with null/undefined', () => {
+      assert.strictEqual(isLogAttributeValue([null, 'test', undefined]), true);
+      assert.strictEqual(isLogAttributeValue([]), true);
+    });
+
+    it('should accept arrays with objects', () => {
+      assert.strictEqual(isLogAttributeValue([{ key: 'value' }, 'string']), true);
+    });
+  });
+
+  describe('should accept objects/maps', () => {
+    it('should accept simple objects', () => {
+      assert.strictEqual(isLogAttributeValue({ key: 'value' }), true);
+      assert.strictEqual(isLogAttributeValue({ num: 42, bool: true }), true);
+    });
+
+    it('should accept empty objects', () => {
+      assert.strictEqual(isLogAttributeValue({}), true);
+    });
+
+    it('should accept nested objects', () => {
+      const nested = {
+        level1: {
+          level2: {
+            deep: 'value',
+            number: 123
+          }
+        }
+      };
+      assert.strictEqual(isLogAttributeValue(nested), true);
+    });
+
+    it('should accept objects with arrays', () => {
+      const obj = {
+        strings: ['a', 'b'],
+        numbers: [1, 2, 3],
+        mixed: ['str', 42, true]
+      };
+      assert.strictEqual(isLogAttributeValue(obj), true);
+    });
+
+    it('should accept objects with null/undefined values', () => {
+      assert.strictEqual(isLogAttributeValue({ nullVal: null, undefVal: undefined }), true);
+    });
+
+    it('should accept objects with byte arrays', () => {
+      assert.strictEqual(isLogAttributeValue({ bytes: new Uint8Array([1, 2, 3]) }), true);
+    });
+  });
+
+  describe('should accept complex combinations', () => {
+    it('should accept deeply nested structures', () => {
+      const complex = {
+        scalars: {
+          str: 'test',
+          num: 42,
+          bool: true
+        },
+        arrays: {
+          homogeneous: ['a', 'b', 'c'],
+          heterogeneous: [1, 'two', true, null],
+          nested: [[1, 2], ['a', 'b']]
+        },
+        bytes: new Uint8Array([255, 254, 253]),
+        nullish: {
+          nullValue: null,
+          undefinedValue: undefined
+        },
+        empty: {}
+      };
+      assert.strictEqual(isLogAttributeValue(complex), true);
+    });
+
+    it('should accept arrays of complex objects', () => {
+      const arrayOfObjects = [
+        { name: 'obj1', value: 123 },
+        { name: 'obj2', nested: { deep: 'value' } },
+        { bytes: new Uint8Array([1, 2, 3]) }
+      ];
+      assert.strictEqual(isLogAttributeValue(arrayOfObjects), true);
+    });
+  });
+
+  describe('should reject invalid values', () => {
+    it('should reject functions', () => {
+      assert.strictEqual(isLogAttributeValue(() => {}), false);
+      assert.strictEqual(isLogAttributeValue(function() {}), false);
+    });
+
+    it('should reject symbols', () => {
+      assert.strictEqual(isLogAttributeValue(Symbol('test')), false);
+      assert.strictEqual(isLogAttributeValue(Symbol.for('test')), false);
+    });
+
+    it('should reject Date objects', () => {
+      assert.strictEqual(isLogAttributeValue(new Date()), false);
+    });
+
+    it('should reject RegExp objects', () => {
+      assert.strictEqual(isLogAttributeValue(/test/), false);
+    });
+
+    it('should reject Error objects', () => {
+      assert.strictEqual(isLogAttributeValue(new Error('test')), false);
+    });
+
+    it('should reject class instances', () => {
+      class TestClass {
+        value = 'test';
+      }
+      assert.strictEqual(isLogAttributeValue(new TestClass()), false);
+    });
+
+    it('should reject arrays containing invalid values', () => {
+      assert.strictEqual(isLogAttributeValue(['valid', () => {}]), false);
+      assert.strictEqual(isLogAttributeValue([Symbol('test'), 'valid']), false);
+      assert.strictEqual(isLogAttributeValue([new Date()]), false);
+    });
+
+    it('should reject objects containing invalid values', () => {
+      assert.strictEqual(isLogAttributeValue({ valid: 'test', invalid: () => {} }), false);
+      assert.strictEqual(isLogAttributeValue({ symbol: Symbol('test') }), false);
+      assert.strictEqual(isLogAttributeValue({ date: new Date() }), false);
+    });
+
+    it('should reject deeply nested invalid values', () => {
+      const nested = {
+        level1: {
+          level2: {
+            valid: 'value',
+            invalid: Symbol('test')
+          }
+        }
+      };
+      assert.strictEqual(isLogAttributeValue(nested), false);
+    });
+
+    it('should reject arrays with nested invalid values', () => {
+      const nestedArray = [
+        ['valid', 'array'],
+        ['has', Symbol('invalid')]
+      ];
+      assert.strictEqual(isLogAttributeValue(nestedArray), false);
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle circular references gracefully', () => {
+      const circular: any = { a: 'test' };
+      circular.self = circular;
+
+      // This should not throw an error, though it might return false
+      // The exact behavior isn't specified in the OpenTelemetry spec
+      const result = isLogAttributeValue(circular);
+      assert.strictEqual(typeof result, 'boolean');
+    });
+
+    it('should handle very deep nesting', () => {
+      let deep: any = 'bottom';
+      for (let i = 0; i < 100; i++) {
+        deep = { level: i, nested: deep };
+      }
+
+      const result = isLogAttributeValue(deep);
+      assert.strictEqual(typeof result, 'boolean');
+    });
+
+    it('should handle large arrays', () => {
+      const largeArray = new Array(1000).fill('test');
+      assert.strictEqual(isLogAttributeValue(largeArray), true);
+    });
+  });
+});