Fix otel log format issue #3123

data-prepper-plugins/otel-proto-common/src/main/java/org/opensearch/dataprepper/plugins/otel/codec/OTelProtoCodec.java

@@ -26,6 +26,7 @@
 import io.opentelemetry.proto.trace.v1.Status;
 import org.apache.commons.codec.DecoderException;
 import org.apache.commons.codec.binary.Hex;
+import org.apache.commons.lang3.tuple.Pair;
 import org.opensearch.dataprepper.model.log.JacksonOtelLog;
 import org.opensearch.dataprepper.model.log.OpenTelemetryLog;
 import org.opensearch.dataprepper.model.metric.Bucket;
@@ -643,17 +644,9 @@ public static Object convertAnyValue(final AnyValue value) {
              * as Json string.
              */
             case ARRAY_VALUE:
-                try {
-                    return OBJECT_MAPPER.writeValueAsString(value.getArrayValue().getValuesList().stream()
-                            .map(OTelProtoCodec::convertAnyValue)
-                            .collect(Collectors.toList()));
-                } catch (JsonProcessingException e) {
-                    throw new RuntimeException(e);
-                }
             case KVLIST_VALUE:
                 try {
-                    return OBJECT_MAPPER.writeValueAsString(value.getKvlistValue().getValuesList().stream()
-                            .collect(Collectors.toMap(i -> REPLACE_DOT_WITH_AT.apply(i.getKey()), i -> convertAnyValue(i.getValue()))));
+                    return OBJECT_MAPPER.writeValueAsString(asPlanObject(value));
                 } catch (JsonProcessingException e) {
                     throw new RuntimeException(e);
                 }
@@ -662,6 +655,33 @@ public static Object convertAnyValue(final AnyValue value) {
         }
     }
 
+    private static Object asPlanObject(AnyValue anyValue){
+        switch (anyValue.getValueCase()) {
+            case VALUE_NOT_SET:
+            case STRING_VALUE:
+                return anyValue.getStringValue();
+            case BOOL_VALUE:
+                return anyValue.getBoolValue();
+            case INT_VALUE:
+                return anyValue.getIntValue();
+            case DOUBLE_VALUE:
+                return anyValue.getDoubleValue();
+            case ARRAY_VALUE:
+                return anyValue.getArrayValue().getValuesList()
+                        .stream()
+                        .map(OTelProtoCodec::asPlanObject)
+                        .collect(Collectors.toList());
+            case KVLIST_VALUE:
+                return anyValue.getKvlistValue().getValuesList()
+                        .stream()
+                        .map(
+                                keyValue -> Pair.of(keyValue.getKey(), asPlanObject(keyValue.getValue()))
+                        )
+                        .collect(Collectors.toMap(i -> REPLACE_DOT_WITH_AT.apply(i.getKey()), Pair::getValue));
+        }
+        return null;
+    }
+
     /**
      * Converts the keys of all attributes in the {@link NumberDataPoint}.
      * Also, casts the underlying data into its actual type

data-prepper-plugins/otel-proto-common/src/test/java/org/opensearch/dataprepper/plugins/otel/codec/OTelProtoCodecTest.java

@@ -89,6 +89,7 @@ public class OTelProtoCodecTest {
 
     private static final String TEST_REQUEST_LOGS_IS_JSON_FILE = "test-request-log-is.json";
 
+    private static final String TEST_REQUEST_COMPLEX_LOGS_JSON_FILE = "test-request-complex-log.json";
 
     private static final Long TIME = TimeUnit.MILLISECONDS.toNanos(ZonedDateTime.of(
             LocalDateTime.of(2020, 5, 24, 14, 1, 0),
@@ -427,6 +428,15 @@ public void testParseExportLogsServiceRequest_ScopedLogs() throws IOException {
             validateLog(logs.get(0));
         }
 
+        @Test
+        public void testParseExportComplexLogsServiceRequest_ScopedLogs() throws IOException {
+            final ExportLogsServiceRequest exportLogsServiceRequest = buildExportLogsServiceRequestFromJsonFile(TEST_REQUEST_COMPLEX_LOGS_JSON_FILE);
+            List<OpenTelemetryLog> logs = decoderUnderTest.parseExportLogsServiceRequest(exportLogsServiceRequest);
+
+            assertThat(logs.size() , is(equalTo(1)));
+            assertThat(logs.get(0).getBody(), is("{\"key1\":\"value1\",\"key2\":\"value2\",\"key3\":{\"nestedKey1\":\"nestedValue1\"}}"));
+        }
+
         @Test
         public void testParseExportLogsServiceRequest_InstrumentationLibraryLogs() throws IOException {
             final ExportLogsServiceRequest exportLogsServiceRequest = buildExportLogsServiceRequestFromJsonFile(TEST_REQUEST_LOGS_IS_JSON_FILE);

data-prepper-plugins/otel-proto-common/src/test/resources/test-request-complex-log.json

@@ -0,0 +1,57 @@
+{
+  "resourceLogs": [{
+    "resource": {
+      "attributes": [{
+        "key": "service.name",
+        "value": {
+          "stringValue": "service"
+        }
+      }]
+    },
+    "scopeLogs": [{
+      "logRecords": [{
+        "timeUnixNano": "1590328800000000000",
+        "severityNumber": "SEVERITY_NUMBER_DEBUG",
+        "body": {
+          "kvlistValue": {
+            "values": [{
+              "key": "key1",
+              "value": {
+                "stringValue": "value1"
+              }
+            }, {
+              "key": "key2",
+              "value": {
+                "stringValue": "value2"
+              }
+            }, {
+              "key": "key3",
+              "value": {
+                "kvlistValue": {
+                  "values": [{
+                    "key": "nestedKey1",
+                    "value": {
+                      "stringValue": "nestedValue1"
+                    }
+                  }]
+                }
+              }
+            }]
+          }
+        },
+        "attributes": [{
+          "key": "statement.params",
+          "value": {
+            "stringValue": "us-east-1"
+          }
+        }],
+        "droppedAttributesCount": 3,
+        "flags": 1,
+        "traceId": "uhocI7QJO2M=",
+        "spanId": "LMg6yQ68Rpw=",
+        "observedTimeUnixNano": "1590328802000000000"
+      }]
+    }],
+    "schemaUrl": "schemaurl"
+  }]
+}