feat(data-point): implement opentracing interface

documentation/examples/opentracing/opentracing-example.js

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+/* eslint-disable */
+
+const DataPoint = require("@data-point/core");
+const DPModel = require("@data-point/core/model");
+const DPIfThenElse = require("@data-point/core/ifThenElse");
+const DPMap = require("@data-point/core/map");
+
+const DPOpenTracing = require("@data-point/tracers/opentracing");
+const initTracer = require("jaeger-client").initTracer;
+
+const fs = require("fs");
+
+const myModel = DPModel({
+  name: "myModel",
+
+  uid: acc => `${acc.reducer.id}${acc.value.a.b}`,
+
+  value: [
+    "$a.b",
+    input => input.toUpperCase(),
+    DPIfThenElse({
+      if: input => input === "FOO",
+      then: () => {
+        // return "yes foo!!";
+        throw new Error("ohh");
+      },
+      else: input => `foo no! got ${input}`
+    })
+  ],
+
+  catch(acc) {
+    console.log(acc);
+    return "its ok";
+  },
+
+  params: {
+    ttl: "20h"
+  }
+});
+
+async function main() {
+  const datapoint = DataPoint();
+
+  const store = new Map();
+
+  datapoint.cache.get = (uid, acc) => {
+    return store.get(uid);
+  };
+
+  datapoint.cache.set = (uid, acc) => {
+    return store.set(uid, acc.value);
+  };
+
+  const input = [
+    {
+      a: {
+        b: "foo"
+      }
+    },
+    {
+      a: {
+        b: "bar"
+      }
+    },
+    {
+      a: {
+        b: "baz"
+      }
+    }
+  ];
+
+  const config = {
+    serviceName: "data-point-test",
+    reporter: {
+      logSpans: true,
+      agentHost: "localhost",
+      agentPort: 6832
+    },
+    sampler: {
+      type: "probabilistic",
+      param: 1.0
+    }
+  };
+
+  const options = {
+    tags: {
+      "data-point-test.version": "1.1.2"
+    }
+  };
+
+  const openTracer = initTracer(config, options);
+
+  const tracer = DPOpenTracing(openTracer);
+
+  result = await datapoint.resolve(input, DPMap(myModel), {
+    tracer
+  });
+
+  openTracer.close();
+}
+
+main();

documentation/examples/opentracing/package.json

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+{
+  "name": "@data-point/opentracing-example",
+  "main": "opentracing-example.js",
+  "private": true,
+  "version": "1.0.0",
+  "devDependencies": {
+    "@data-point/core": "^6.0.0",
+    "@data-point/tracers": "^1.0.0",
+    "jaeger-client": "^3.15.0"
+  }
+}

packages/data-point-tracers/opentracing/index.js

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+module.exports = require("./opentracing").OpenTracing.create;

packages/data-point-tracers/opentracing/opentracing.js

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+class OpenTracing {
+  constructor(tracer) {
+    this.tracer = tracer;
+  }
+
+  static create(tracer) {
+    return new OpenTracing(tracer);
+  }
+
+  start(dpSpan) {
+    const isRoot = dpSpan.root === true;
+
+    let oTspan;
+
+    if (isRoot) {
+      oTspan = this.tracer.startSpan(dpSpan.name);
+    } else {
+      const parentSpan = dpSpan.parent;
+      oTspan = this.tracer.startSpan(dpSpan.name, {
+        childOf: parentSpan.data.span.context()
+      });
+    }
+
+    // eslint-disable-next-line no-param-reassign
+    dpSpan.data.span = oTspan;
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  error(dpSpan, error) {
+    // marks the span as an error
+    dpSpan.data.span.setTag("error", "true");
+    dpSpan.data.span.log({
+      "error.description": error.message,
+      "error.stack": error.stack
+    });
+  }
+
+  // eslint-disable-next-line class-methods-use-this
+  finish(dpSpan) {
+    dpSpan.data.span.finish();
+  }
+}
+
+module.exports = {
+  OpenTracing
+};

packages/data-point-tracers/opentracing/opentracing.test.js

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+const { OpenTracing } = require("./opentracing");
+
+const mockOpenTraceSpan = {
+  context: jest.fn(() => "context"),
+  setTag: jest.fn(),
+  log: jest.fn(),
+  finish: jest.fn()
+};
+
+const mockOpenTrace = {
+  startSpan: jest.fn(() => mockOpenTraceSpan)
+};
+
+function createSpan() {
+  return {
+    name: "name",
+    parent: {},
+    data: {}
+  };
+}
+
+afterEach(() => {
+  jest.clearAllMocks();
+});
+
+describe("OpenTracing", () => {
+  describe("constructor", () => {
+    it("should set tracer", () => {
+      const result = new OpenTracing("tracer");
+      expect(result).toHaveProperty("tracer", "tracer");
+    });
+  });
+
+  describe("create", () => {
+    it("should create a new OpenTracing instance", () => {
+      const result = OpenTracing.create("tracer");
+      expect(result).toBeInstanceOf(OpenTracing);
+      expect(result).toHaveProperty("tracer", "tracer");
+    });
+  });
+
+  describe("start", () => {
+    it("should create a new root span", () => {
+      const result = new OpenTracing(mockOpenTrace);
+      const span = createSpan();
+      span.root = true;
+      result.start(span);
+      expect(mockOpenTrace.startSpan).toBeCalledTimes(1);
+      expect(mockOpenTrace.startSpan).toBeCalledWith("name");
+      // store span on `data` property
+      expect(span.data).toHaveProperty("span", mockOpenTraceSpan);
+    });
+
+    it("should create a new child span", () => {
+      const result = new OpenTracing(mockOpenTrace);
+      const span = createSpan();
+      span.parent = createSpan();
+      span.parent.data.span = mockOpenTraceSpan;
+
+      result.start(span);
+      expect(mockOpenTrace.startSpan).toBeCalledTimes(1);
+      expect(mockOpenTrace.startSpan).toBeCalledWith("name", {
+        childOf: mockOpenTraceSpan.context()
+      });
+      // store span on `data` property
+      expect(span.data).toHaveProperty("span", mockOpenTraceSpan);
+    });
+  });
+
+  describe("error", () => {
+    function callErrorAPI(error) {
+      const result = new OpenTracing(mockOpenTrace);
+      const span = createSpan();
+      span.data.span = mockOpenTraceSpan;
+      result.error(span, error);
+      return span;
+    }
+    it("should set tag with error === 'true'", () => {
+      const error = new Error("test");
+      const span = callErrorAPI(error);
+      expect(span.data.span.setTag).toBeCalledWith("error", "true");
+    });
+
+    it("should add error to log", () => {
+      const error = new Error("test");
+      const span = callErrorAPI(error);
+      expect(span.data.span.log).toBeCalledWith({
+        "error.description": error.message,
+        "error.stack": error.stack
+      });
+    });
+  });
+
+  describe("finish", () => {
+    it("should call span.finish()", () => {
+      const result = new OpenTracing(mockOpenTrace);
+      const span = createSpan();
+      span.data.span = mockOpenTraceSpan;
+      result.finish(span);
+      expect(span.data.span.finish).toBeCalled();
+    });
+  });
+});

packages/data-point-tracers/package.json

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+{
+  "name": "@data-point/tracers",
+  "main": "index.js",
+  "version": "1.0.0",
+  "private": true
+}