Set 'env' to 'none' if not set or empty

dd-trace-core/src/main/java/datadog/trace/common/writer/ddintake/DDIntakeTraceInterceptor.java

@@ -47,9 +47,7 @@ private void process(DDSpan span) {
  span.setResourceName(span.getOperationName());
  }
 
- if (span.getTag("env") != null) {
- span.setTag("env", TraceUtils.normalizeEnv((String) span.getTag("env")));
- }
+ span.setTag("env", TraceUtils.normalizeEnv((String) span.getTag("env")));
 
  final short httpStatusCode = span.getHttpStatusCode();
  if (httpStatusCode != 0 && !isValidStatusCode(httpStatusCode)) {

dd-trace-core/src/test/groovy/datadog/trace/common/writer/ddintake/DDIntakeTraceInterceptorTest.groovy

@@ -72,4 +72,18 @@ class DDIntakeTraceInterceptorTest extends DDCoreSpecification {
  def span = trace[0]
  span.type == originalSpanType
  }
+
+ def "test default env setting"() {
+ setup:
+ tracer.buildSpan("my-operation-name").start().finish()
+ writer.waitForTraces(1)
+
+ expect:
+ def trace = writer.firstTrace()
+ trace.size() == 1
+
+ def span = trace[0]
+
+ span.getTag("env") == "none"
+ }
 }

internal-api/src/main/java/datadog/trace/util/TraceUtils.java

@@ -19,6 +19,7 @@ public class TraceUtils {
 
  static final String DEFAULT_SERVICE_NAME = "unnamed-service";
  static final String DEFAULT_OPERATION_NAME = "unnamed_operation";
+ static final String DEFAULT_ENV = "none";
 
  private static final Logger log = LoggerFactory.getLogger(TraceUtils.class);
 
@@ -73,7 +74,7 @@ public static CharSequence normalizeSpanType(final CharSequence spanType) {
 
  public static String normalizeEnv(final String env) {
  if (env == null || env.length() == 0) {
- return "";
+ return DEFAULT_ENV;
  }
 
  String e = truncate(env, MAX_ENV_LEN);

internal-api/src/test/groovy/datadog/trace/util/TraceUtilsTest.groovy

@@ -114,8 +114,8 @@ class TraceUtilsTest extends DDSpecification {
 
  where:
  env | expected
- null | ""
- "" | ""
+ null  | TraceUtils.DEFAULT_ENV
+ ""  | TraceUtils.DEFAULT_ENV
  "ok" | "ok"
  repeat("a",300)|repeat("a",200)
  }