example

gomemcache instrumentation example

A simple example to demonstrate gomemcache client tracing instrumentation. It consists of two containers - memcached-server, which initializes and runs the Memcached server for this example, and gomemcache-client, which is the instrumented client.

In the example, the client invokes function doMemcacheOperations(), which is wrapped in a span. From within the function, the client will do a few example operations (add, get, delete with an intentional error) and cleans up the entries by calling DeleteAll.

These instructions expect you to have docker-compose installed.

Running the example

1. From within the example directory, bring up the project by running:

   docker-compose up --detach
   

2. The instrumentation works with a stdout exporter, meaning the spans should be visible in the output of the gomemcache-container. To inspect the output, you can run:

   docker-compose logs gomemcache-client
   

   In the log, total of 5 spans should appear - the parent span test-operations and 4 child spans, each corresponding to one client operation. Additionally, the Delete operation span should also include StatusCode and StatusMessage, as this operation intentionally leads to an error.

3. After inspecting the client logs, the example can be cleaned up by running:

   docker-compose down