Implement automatic Test Visibility instrumentation for .NET projects

README.md

@@ -248,7 +248,7 @@ pipeline {
         datadog(testVisibility: [ 
             enabled: true, 
             serviceName: "my-service", // the name of service or library being tested
-            languages: ["JAVA"], // languages that should be instrumented (available options are "JAVA", "JAVASCRIPT", "PYTHON")
+            languages: ["JAVA"], // languages that should be instrumented (available options are "JAVA", "JAVASCRIPT", "PYTHON", "DOTNET")
             additionalVariables: ["my-var": "value"]  // additional tracer configuration settings (optional)
         ])
     }

src/main/java/org/datadog/jenkins/plugins/datadog/apm/DatadogTracerConfigurator.java

@@ -35,6 +35,7 @@ public class DatadogTracerConfigurator {
 
     public DatadogTracerConfigurator() {
         configurators = new EnumMap<>(TracerLanguage.class);
+        configurators.put(TracerLanguage.DOTNET, new DotnetConfigurator());
         configurators.put(TracerLanguage.JAVA, new JavaConfigurator());
         configurators.put(TracerLanguage.JAVASCRIPT, new JavascriptConfigurator());
         configurators.put(TracerLanguage.PYTHON, new PythonConfigurator());

src/main/java/org/datadog/jenkins/plugins/datadog/apm/DotnetConfigurator.java

@@ -0,0 +1,36 @@
+package org.datadog.jenkins.plugins.datadog.apm;
+
+import hudson.FilePath;
+import hudson.model.Node;
+import hudson.model.TaskListener;
+import java.io.File;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public class DotnetConfigurator implements TracerConfigurator {
+    private static final int GET_DOTNET_VERSION_TIMEOUT_MILLIS = 30_000;
+    private static final int INSTALL_TRACER_TIMEOUT_MILLIS = 300_000;
+    private static final int SHOW_TRACER_VARS_TIMEOUT_MILLIS = 30_000;
+
+    @Override
+    public Map<String, String> configure(DatadogTracerJobProperty<?> tracerConfig, Node node, FilePath workspacePath, Map<String, String> envs, TaskListener listener) throws Exception {
+        String dotnetVersion = workspacePath.act(new ShellCommandCallable(Collections.emptyMap(), GET_DOTNET_VERSION_TIMEOUT_MILLIS, "dotnet", "--version"));
+        listener.getLogger().println("[datadog] Configuring DD .NET tracer: got .NET version " + dotnetVersion + " from " + workspacePath + " on " + node);
+
+        String installTracerOutput = workspacePath.act(new ShellCommandCallable(Collections.emptyMap(), INSTALL_TRACER_TIMEOUT_MILLIS, "dotnet", "tool", "update", "--tool-path", workspacePath.getRemote(), "dd-trace"));
+        listener.getLogger().println("[datadog] Configuring DD .NET tracer: tracer installed in " + workspacePath + " on " + node + "; output: " + installTracerOutput);
+
+        String tracerVarOutput = workspacePath.act(new ShellCommandCallable(Collections.emptyMap(), SHOW_TRACER_VARS_TIMEOUT_MILLIS, workspacePath.getRemote() + File.separator + "dd-trace", "ci", "configure", "jenkins"));
+
+        Map<String, String> variables = new HashMap<>();
+        for (String line : tracerVarOutput.split("\n")) {
+            if (!line.contains("=")) {
+                continue;
+            }
+            String[] tokens = line.split("=");
+            variables.put(tokens[0], tokens.length == 2 ? tokens[1] : "");
+        }
+        return variables;
+    }
+}

src/main/java/org/datadog/jenkins/plugins/datadog/apm/JavascriptConfigurator.java

@@ -34,7 +34,7 @@ public Map<String, String> configure(DatadogTracerJobProperty<?> tracerConfig, N
 
         Map<String, String> variables = new HashMap<>();
         variables.put("DD_TRACE_PATH", tracerPath.toString());
-        variables.put("NODE_OPTIONS", PropertyUtils.prepend(envs, "NODE_OPTIONS", "-r $DD_TRACE_PATH/ci/init"));
+        variables.put("NODE_OPTIONS", PropertyUtils.prepend(envs, "NODE_OPTIONS", String.format("-r %s/ci/init", tracerPath)));
         return variables;
     }
 }

src/main/java/org/datadog/jenkins/plugins/datadog/apm/TracerLanguage.java

@@ -1,6 +1,7 @@
 package org.datadog.jenkins.plugins.datadog.apm;
 
 public enum TracerLanguage {
+    DOTNET(".NET"),
     JAVA("Java"),
     JAVASCRIPT("JS"),
     PYTHON("Python");

src/main/resources/org/datadog/jenkins/plugins/datadog/apm/DatadogTracerJobProperty/help-languages.html

@@ -37,4 +37,9 @@
         If these variables are overridden inside the job (with their existing value being discarded rather than preserved),
         the injection will not happen.
     </p>
+
+    <strong>.NET</strong>
+    <p>
+        The plugin assumes that <code>dotnet</code> and <code>dotnet tool</code> are available on the node that executes the job.
+    </p>
 </div>