Add initial load spans example (#35)

Author: draffensperger

examples/initial_load/README.md

@@ -0,0 +1,68 @@
+# OpenCensus Web example server for initial load spans
+
+This example server renders a simple hello page and writes both the server-side
+and client side spans for the initial page load to the [OpenCensus agent](https://github.com/census-instrumentation/opencensus-service).
+
+## Running locally
+
+### Step 1: Install and run the OpenCensus agent
+
+To run this example in local development mode, you will need to run the [OpenCensus
+agent](https://github.com/census-instrumentation/opencensus-service).
+
+First set your `GOPATH` environment variable and then install the agent by
+running:
+
+```bash
+go get -d github.com/census-instrumentation/opencensus-service
+```
+
+Then create a `config.yaml` file following the
+[Configuration](https://github.com/census-instrumentation/opencensus-service#config) instructions for the agent. You will need to have the `opencensus` receiver set up on the default port of `55678`, and you will need at least one exporter so you can see the traces that are generated. For example, your config file could look like this:
+
+```yaml
+receivers:
+  opencensus:
+    address: "127.0.0.1:55678"
+
+exporters:
+  # Pick and configure an exporter e.g. stackdriver, zipkin, aws-xray, honeycomb
+```
+Then in the same folder as your `config.yaml` run the agent with this command:
+
+```bash
+go run github.com/census-instrumentation/opencensus-service/cmd/ocagent
+```
+
+### Step 2: Run the local webpack server
+
+Then within your `opencensus-web` folder run the local webpack server for the
+`opencensus-all` package to serve the OpenCensus web scripts:
+
+```bash
+cd packages/opencensus-web-all
+npm run start:webpack-server
+```
+
+That will start the webpack development server on `localhost:8080`.
+
+### Step 3: Run this example server
+
+Now you can run this example server with the following commands from within your
+`opencensus-web` folder:
+
+```bash
+cd examples/initial_load
+go run server.go
+```
+
+Now visit http://localhost:8000/index.html in your browser to see the hello
+world page render. If you look in the browser developer tools network tab, you
+should see an XHR that writes trace spans to the OpenCensus agent. Then go to
+the trace viewer for the exporter you set up and view the trace of your initial
+page load. It will be named `Nav./index.html` (or just `Nav./` if you left off
+the actual `index.html` part when you visited the URL).
+
+## Deploying to Kubernetes
+
+TODO(draffensperger): develop example Kubernetes deployment instructions.

examples/initial_load/go.mod

@@ -0,0 +1,9 @@
+module github.com/opencensus-web/examples/initial_load
+
+go 1.11
+
+require (
+	contrib.go.opencensus.io/exporter/ocagent v0.4.9
+	github.com/grpc-ecosystem/grpc-gateway v1.8.5 // indirect
+	go.opencensus.io v0.19.2
+)

examples/initial_load/go.sum

@@ -0,0 +1,145 @@
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examples/initial_load/index.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>OpenCensus Web Hello World</title>
+    <!-- Load bootstrap to see a resource load span -->
+    <link
+      href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css"
+      rel="stylesheet"
+      integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB"
+      crossorigin="anonymous">
+  </head>
+  <body>
+    <h1>OpenCensus Web Hello World!</h1>
+
+    <p>This example demonstrates client side browser spans in the same trace as
+    server side spans for an initial page load.</p>
+
+    <p>Because the browser does not send a trace context header for the initial
+    page load, the server generates the parent trace context and sends it back
+    in the HTML template in a <code>&lt;script&gt;</code> tag by setting the
+    global <code>traceparent</code> variable according to the
+    <a href="https://www.w3.org/TR/trace-context/">W3C Draft Trace Context</a> standard.</p>
+
+    <script>
+      traceparent = "{{.Traceparent}}";
+      ocwAgent = "{{.AgentEndpoint}}";
+    </script>
+    <script src="{{.OcwScriptEndpoint}}/initial-load-all.js" async></script>
+    <footer>
+      The <code>traceparent</code> value received from server was
+      <code>"{{.Traceparent}}"</code>.
+    </footer>
+  </body>
+</html>