chore: adding instrumentation for connect

examples/connect/README.md

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+# Overview
+
+OpenTelemetry Connect Instrumentation allows the user to automatically collect trace data and export them to the backend of choice (Collector Exporter), to give observability to distributed systems.
+
+This is a simple example that demonstrates tracing calls made to Connect API. The example shows key aspects of tracing such as
+- Root Span (on Client)
+- Child Span (on Client)
+- Span Events
+- Span Attributes
+
+## Installation
+
+```sh
+$ # from this directory
+$ npm install
+```
+
+## Run the Application
+
+### Collector - docker container
+
+ - Run docker container with collector
+
+   ```sh
+   # from this directory
+   $ npm run docker:start
+   ```
+
+### Server
+
+ - Run the server
+
+   ```sh
+   # from this directory
+   $ npm run server
+   ```
+
+ - Run the client
+
+   ```sh
+   # from this directory
+   npm run client
+   ```
+
+#### Zipkin UI
+Go to Zipkin with your browser [http://localhost:9411/]()
+
+<p align="center"><img src="images/trace1.png?raw=true"/></p>
+
+## Useful links
+- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
+- For more information on OpenTelemetry for Node.js, visit: <https://github.com/open-telemetry/opentelemetry-js/tree/main/packages/opentelemetry-node>
+
+## LICENSE
+
+Apache License 2.0

examples/connect/client.js

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+'use strict';
+
+// eslint-disable-next-line import/order
+const tracing = require('./tracing')('example-connect-client');
+const tracer = tracing.tracer;
+const api = require('@opentelemetry/api');
+const axios = require('axios').default;
+
+function makeRequest() {
+  tracing.log('starting');
+  const span = tracer.startSpan('client.makeRequest()', {
+    kind: api.SpanKind.CLIENT,
+  });
+
+  api.context.with(api.trace.setSpan(api.ROOT_CONTEXT, span), async () => {
+    try {
+      const res = await axios.post('http://localhost:8080/run_test');
+      tracing.log('status:', res.statusText);
+      span.setStatus({ code: api.SpanStatusCode.OK });
+    } catch (e) {
+      tracing.log('failed:', e.message);
+      span.setStatus({ code: api.SpanStatusCode.ERROR, message: e.message });
+    }
+    span.end();
+    tracing.log('forcing spans to be exported');
+    await tracing.provider.shutdown();
+    tracing.log('all spans exported successfully.');
+  });
+}
+
+makeRequest();

examples/connect/docker/collector-config.yaml

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+receivers:
+  otlp:
+    protocols:
+      grpc:
+      http:
+        cors_allowed_origins:
+        - http://*
+        - https://*
+
+exporters:
+  zipkin:
+    endpoint: "http://zipkin-all-in-one:9411/api/v2/spans"
+  prometheus:
+    endpoint: "0.0.0.0:9464"
+
+processors:
+  batch:
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      exporters: [zipkin]
+      processors: [batch]
+    metrics:
+      receivers: [otlp]
+      exporters: [prometheus]
+      processors: [batch]

examples/connect/docker/docker-compose.yaml

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+version: "3"
+services:
+  # Collector
+  collector:
+    image: otel/opentelemetry-collector:0.30.0
+#    image: otel/opentelemetry-collector:latest
+    command: ["--config=/conf/collector-config.yaml", "--log-level=DEBUG"]
+    volumes:
+      - ./collector-config.yaml:/conf/collector-config.yaml
+    ports:
+      - "9464:9464"
+      - "4317:4317"
+      - "55681:55681"
+    depends_on:
+      - zipkin-all-in-one
+
+  # Zipkin
+  zipkin-all-in-one:
+    image: openzipkin/zipkin:latest
+    ports:
+      - "9411:9411"

examples/connect/package.json

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+{
+  "name": "express-connect",
+  "private": true,
+  "version": "0.23.0",
+  "description": "Example of Connect integration with OpenTelemetry",
+  "main": "index.js",
+  "scripts": {
+    "client": "node ./client.js",
+    "docker:start": "cd ./docker && docker-compose down && docker-compose up",
+    "docker:stop": "cd ./docker && docker-compose down",
+    "server": "node ./server.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com/open-telemetry/opentelemetry-js.git"
+  },
+  "keywords": [
+    "opentelemetry",
+    "express",
+    "tracing"
+  ],
+  "engines": {
+    "node": ">=8"
+  },
+  "files": [
+    "build/src/**/*.js",
+    "build/src/**/*.map",
+    "build/src/**/*.d.ts",
+    "doc",
+    "LICENSE",
+    "README.md"
+  ],
+  "author": "OpenTelemetry Authors",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/open-telemetry/opentelemetry-js/issues"
+  },
+  "dependencies": {
+    "@opentelemetry/api": "^1.0.1",
+    "@opentelemetry/exporter-jaeger": "^0.23.0",
+    "@opentelemetry/exporter-zipkin": "^0.23.0",
+    "@opentelemetry/exporter-collector": "^0.23.0",
+    "@opentelemetry/instrumentation": "^0.23.0",
+    "@opentelemetry/instrumentation-connect": "^0.23.0",
+    "@opentelemetry/instrumentation-http": "^0.23.0",
+    "@opentelemetry/node": "^0.23.0",
+    "@opentelemetry/resources": "^0.23.0",
+    "@opentelemetry/semantic-conventions": "^0.23.0",
+    "@opentelemetry/tracing": "^0.23.0",
+    "axios": "^0.21.1",
+    "cross-env": "^7.0.3",
+    "connect": "^3.7.0"
+  },
+  "homepage": "https://github.com/open-telemetry/opentelemetry-js#readme",
+  "devDependencies": {}
+}

examples/connect/server.js

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+'use strict';
+
+// eslint-disable-next-line
+const tracing = require('./tracing')('example-connect-server');
+
+// Require in rest of modules
+const connect = require('connect');
+const axios = require('axios');
+
+// Setup express
+const app = connect();
+const PORT = 8080;
+
+app.use(function middleware1(req, res, next) {
+  next();
+});
+
+app.use((req, res, next) => {
+  next();
+});
+
+app.use('/run_test', async (req, res) => {
+  const result = await axios.get('https://raw.githubusercontent.com/open-telemetry/opentelemetry-js/main/package.json');
+  tracing.log('sending response');
+  res.end(`OK ${result.data.version}`);
+  if (tracing.connectInstrumentation.isEnabled()) {
+    tracing.log('disabling connect');
+    tracing.connectInstrumentation.disable();
+  } else {
+    tracing.log('enabling connect');
+    tracing.connectInstrumentation.enable();
+  }
+});
+
+app.listen(PORT);

examples/connect/tracing.js

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+'use strict';
+
+const opentelemetry = require('@opentelemetry/api');
+
+const { diag, DiagConsoleLogger, DiagLogLevel } = opentelemetry;
+diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.INFO);
+
+const { Resource } = require('@opentelemetry/resources');
+const { ResourceAttributes: SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
+const { registerInstrumentations } = require('@opentelemetry/instrumentation');
+const { NodeTracerProvider } = require('@opentelemetry/node');
+const { SimpleSpanProcessor } = require('@opentelemetry/tracing');
+const { CollectorTraceExporter } = require('@opentelemetry/exporter-collector');
+
+const { ConnectInstrumentation } = require('@opentelemetry/instrumentation-connect');
+const { HttpInstrumentation } = require('@opentelemetry/instrumentation-http');
+
+function log() {
+  const args = Array.from(arguments) || [];
+  args.unshift(new Date());
+  console.log.apply(this, args);
+}
+
+module.exports = (serviceName) => {
+  const provider = new NodeTracerProvider({
+    resource: new Resource({
+      [SemanticResourceAttributes.SERVICE_NAME]: serviceName,
+    }),
+  });
+  const connectInstrumentation = new ConnectInstrumentation();
+  registerInstrumentations({
+    tracerProvider: provider,
+    instrumentations: [
+      // Connect instrumentation expects HTTP layer to be instrumented
+      HttpInstrumentation,
+      connectInstrumentation,
+    ],
+  });
+
+  const exporter = new CollectorTraceExporter();
+
+  provider.addSpanProcessor(new SimpleSpanProcessor(exporter));
+
+  // Initialize the OpenTelemetry APIs to use the NodeTracerProvider bindings
+  provider.register({});
+  return {
+    log,
+    connectInstrumentation,
+    provider,
+    tracer: opentelemetry.trace.getTracer('connect-example'),
+  }
+};

plugins/node/opentelemetry-instrumentation-connect/.eslintignore

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+build
+coverage

plugins/node/opentelemetry-instrumentation-connect/.eslintrc.js

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+module.exports = {
+    "env": {
+        "mocha": true,
+        "node": true
+    },
+    ...require('../../../eslint.config.js')
+}

plugins/node/opentelemetry-instrumentation-connect/.npmignore

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+/bin
+/coverage
+/doc
+/test