feat(opentelemetry-sampler-aws-xray): add x-ray remote sampler

packages/opentelemetry-remote-sampler-aws-xray/LICENSE

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packages/opentelemetry-remote-sampler-aws-xray/README.md

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+# AWS X-Ray Remote Sampler

packages/opentelemetry-remote-sampler-aws-xray/package.json

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+{
+  "name": "@opentelemetry/remote-sampler-aws-xray",
+  "version": "0.34.0",
+  "description": "OpenTelemetry remote sampler for AWS X-Ray",
+  "keywords": [
+    "aws",
+    "nodejs",
+    "opentelemetry"
+  ],
+  "license": "Apache-2.0",
+  "author": "OpenTelemetry Authors",
+  "bugs": {
+    "url": "https://github.com/open-telemetry/opentelemetry-js-contrib/issues"
+  },
+  "main": "build/src/index.js",
+  "types": "build/src/index.d.ts",
+  "files": [
+    "build/src/**/*.js",
+    "build/src/**/*.js.map",
+    "build/src/**/*.d.ts",
+    "doc",
+    "LICENSE",
+    "README.md"
+  ],
+  "repository": "open-telemetry/opentelemetry-js-contrib",
+  "scripts": {
+    "clean": "rimraf build/*",
+    "compile": "tsc -p .",
+    "lint": "eslint . --ext .ts",
+    "lint:fix": "eslint . --ext .ts --fix",
+    "precompile": "tsc --version && lerna run version:update --scope @opentelemetry/remote-sampler-aws-xray --include-dependencies",
+    "prewatch": "npm run precompile",
+    "prepare": "npm run compile",
+    "tdd": "npm run test -- --watch-extensions ts --watch",
+    "test": "nyc ts-mocha -p tsconfig.json --require '@opentelemetry/contrib-test-utils' 'test/**/*.test.ts'",
+    "test-all-versions": "tav",
+    "version:update": "node ../../scripts/version-update.js",
+    "watch": "tsc -w"
+  },
+  "peerDependencies": {
+    "@opentelemetry/api": "^1.3.0"
+  },
+  "dependencies": {
+    "@opentelemetry/core": "^1.8.0",
+    "@opentelemetry/instrumentation": "^0.35.1",
+    "@opentelemetry/semantic-conventions": "^1.0.0",
+    "@opentelemetry/propagation-utils": "^0.29.2"
+  },
+  "devDependencies": {
+    "@opentelemetry/api": "^1.3.0",
+    "@opentelemetry/contrib-test-utils": "^0.33.1",
+    "@opentelemetry/sdk-trace-base": "^1.8.0",
+    "@types/mocha": "8.2.3",
+    "@types/node": "18.11.7",
+    "@types/sinon": "10.0.6",
+    "eslint": "8.7.0",
+    "expect": "29.2.0",
+    "gts": "3.1.0",
+    "mocha": "7.2.0",
+    "nock": "13.2.1",
+    "nyc": "15.1.0",
+    "rimraf": "4.2.0",
+    "sinon": "15.0.1",
+    "test-all-versions": "5.0.1",
+    "ts-mocha": "10.0.0",
+    "typescript": "4.3.4"
+  },
+  "engines": {
+    "node": ">=14"
+  }
+}

packages/opentelemetry-remote-sampler-aws-xray/src/index.ts

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+/*
+ * 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.
+ */
+export * from './remote-sampler';
+export * from './remote-sampler.types';

packages/opentelemetry-remote-sampler-aws-xray/src/remote-sampler.ts

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+/*
+ * 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 { Sampler, SamplingDecision, SamplingResult } from '@opentelemetry/sdk-trace-base';
+import { SamplingRule } from './remote-sampler.types';
+import axios from 'axios';
+
+const DEFAULT_INTERVAL = 5 * 60 * 1000;// 5 minutes on sampling rules fetch (default polling interval)
+
+
+// IN PROGRESS - SKELETON CLASS 
+export class AWSXRayRemoteSampler implements Sampler {
+    private _pollingInterval: number;
+    private _endpoint: string;
+    private _samplingRulesEndpoint: string;
+
+    constructor(endpoint: string, pollingInterval: number = DEFAULT_INTERVAL) {
+
+        if (pollingInterval <= 0 || !Number.isInteger(pollingInterval)) {
+            throw new TypeError('pollingInterval must be a positive integer');
+        }
+
+        this._pollingInterval = pollingInterval;
+        this._endpoint = endpoint;
+        this._samplingRulesEndpoint = "/GetSamplingRules";
+
+        // execute first get Sampling rules update using polling interval
+        this.getSamplingRules();
+    }
+
+    shouldSample(): SamplingResult {
+        // Implementation to be added
+        return { decision: SamplingDecision.NOT_RECORD };
+    }
+
+    toString(): string {
+        return `AWSXRayRemoteSampler`;
+    }
+
+    getEndpoint(): string {
+        return this._endpoint;
+    }
+
+    getPollingInterval(): number {
+        return this._pollingInterval;
+    }
+
+
+    // fetch sampling rules every polling interval
+    public async getSamplingRules(): Promise<void> {
+        const endpoint = this._endpoint + this._samplingRulesEndpoint;
+
+        setInterval(async () => {
+            const samplingRules: SamplingRule[] = []; // reset rules array
+
+            const headers = {
+                headers: {
+                    'Content-Type': 'application/json',
+                }
+            };
+
+            try {
+                const response = await axios.post(endpoint, null, headers);
+                const responseJson = response.data;
+
+                responseJson?.SamplingRuleRecords.forEach((record: any) => {
+                    if (record.SamplingRule) {
+                        samplingRules.push(record.SamplingRule);
+                    }
+                });
+            } catch (error) {
+                // Log error
+                console.log("Error fetching sampling rules: ", error);
+            }
+        }, this._pollingInterval);
+
+    }
+
+}