C Distributed Tracing Example

This is an unsupported example. This project is provided AS-IS WITHOUT WARRANTY OR SUPPORT.

This repository contains two example application, used to illustrate instrumenting an application with the New Relic C SDK. The two applications are a client app written in C and a server app written in C++. The client will send an HTTP get request to the server application with a distributed trace payload. Either of these application can be replaced with an application written in an other New Relic supported language and instrumented with a New Relic agent.

Requirements

• gcc 4.9 or greater
• CMake 3.0 or greater
• g++ 7.3.1 or greater
• curl 7.29 or greater

The server application

Building and running the server

The server will require the following environment variables.

Var Name	Description	Required
NEW_RELIC_LICENSE_KEY	The New Relic License Key.	Required
NEW_RELIC_HOST	New Relic collector host. If NULL will be set to the default of collector.newrelic.com	Not required
SERVER_NEW_RELIC_APP_NAME	The New Relic app name that will appear in the UI.	Required

Run the following commands to build the server application.

1. Clone and compile the C SDK, there are more instructions here.
   1. Use the make dynamic command to create the libnewrelic.so
2. Copy libnewrelic.so to the server/ directory.
3. Copy libnewrelic.h to this projects root directory.
4. cmake .
5. make
6. Follow the directions in the C SDK repo to start the New Relic daemon.
7. ./server

The client application

Building and running the client

The client will require the following environment variables and there are no defaults.

Var Name	Description	Required
NEW_RELIC_LICENSE_KEY	The New Relic License Key.	Required
NEW_RELIC_HOST	New Relic collector host. If NULL will be set to the default of collector.newrelic.com	Not Required
CLIENT_NEW_RELIC_APP_NAME	The New Relic app name that will appear in the UI.	Required

Run the following commands to build the client application.

1. Clone and compile the C SDK, there are more instructions here.
2. Copy libnewrelic.h and libnewrelic.a to this projects root directory.
3. make
4. Follow the directions in the C SDK repo to start the New Relic daemon.
5. ./client.out