DGuhr · Feb 25, 2022
@@ -86,6 +86,17 @@ Be aware that you need to escape characters when invoking commands containing sp
 <@kc.start parameters="\"\'%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c{3.}] (%t) %s%e%n\'\""/>
 The example above abbreviates the category name, which could get rather long in some cases, to three characters by setting `[%c{3.}]` in the template instead of the default `[%c]`.
 
+== Logging in JSON format
+To use structured JSON log output, run the following command:
+
+<@kc.start parameters="--log-json-enabled=true"/>
+
+.Example Log Message
+[source, json]
+----
+{"timestamp":"2022-02-25T10:31:32.452+01:00","sequence":8442,"loggerClassName":"org.jboss.logging.Logger","loggerName":"io.quarkus","level":"INFO","message":"Keycloak 18.0.0-SNAPSHOT on JVM (powered by Quarkus 2.7.2.Final) started in 3.253s. Listening on: http://0.0.0.0:8080","threadName":"main","threadId":1,"mdc":{},"ndc":"","hostName":"host-name","processName":"QuarkusEntryPoint","processId":36946}
+----
+
 == Configuring raw quarkus logging properties
 At the time of writing, the logging features of the quarkus based Keycloak are basic, yet powerful. Nevertheless, expect more to come and feel free to join the https://github.com/keycloak/keycloak/discussions/8870[discussion] at GitHub.
 

@@ -78,6 +78,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-smallrye-metrics-deployment</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-logging-json-deployment</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkiverse.vault</groupId>
             <artifactId>quarkus-vault-deployment</artifactId>

@@ -79,6 +79,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-smallrye-metrics</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-logging-json</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.wildfly.security</groupId>
             <artifactId>wildfly-elytron</artifactId>

@@ -2,6 +2,7 @@
 
 import static org.keycloak.quarkus.runtime.integration.QuarkusPlatform.addInitializationException;
 
+import java.util.Arrays;
 import java.util.Locale;
 import java.util.function.BiFunction;
 import java.util.logging.Level;
@@ -69,6 +70,13 @@ public String apply(String value, ConfigSourceInterceptorContext configSourceInt
                         .defaultValue("%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c] (%t) %s%e%n")
                         .description("The format of log entries. If the format has spaces in it, you need to escape the value such as \"<format>\".")
                         .paramLabel("format")
+                        .build(),
+                builder().from("log-json-enabled")
+                        .to("quarkus.log.console.json")
+                        .defaultValue(Boolean.FALSE.toString())
+                        .description("Enable or disable logging to console using structured JSON.")
+                        .paramLabel(Boolean.TRUE + "|" + Boolean.FALSE)
+                        .expectedValues(Arrays.asList(Boolean.TRUE.toString(), Boolean.FALSE.toString()))
                         .build()
         };
     }

@@ -10,6 +10,7 @@ metrics-enabled=false
 
 # Default, and insecure, and non-production grade configuration for the development profile
 %dev.http-enabled=true
+%dev.log-json-enabled=false
 %dev.hostname-strict=false
 %dev.hostname-strict-https=false
 %dev.cache=local

@@ -21,11 +21,17 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.List;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.approvaltests.Approvals;
 import io.quarkus.test.junit.main.LaunchResult;
 
 public interface CLIResult extends LaunchResult {
 
+    static ObjectMapper objectMapper = new ObjectMapper();
+
     static Object create(List<String> outputStream, List<String> errStream, int exitCode) {
         return new CLIResult() {
             @Override
@@ -97,4 +103,19 @@ default void assertLocalCache() {
     default void assertClusteredCache() {
         assertTrue(isClustered());
     }
+
+    default void assertJsonLogDefaultsApplied() throws JsonProcessingException {
+        String[] split = getOutput().split(System.lineSeparator());
+        for (String l: split) {
+            if (!l.trim().startsWith("{")) {
+                //we ignore non-json output for now. Problem is the build does not know about the runtime configuration,
+                // so when invoking start-dev and a build is done, the output is not json but unstructured console output
+                continue;
+            }
+            JsonNode json = objectMapper.readTree(l);
+            assertTrue(json.has("timestamp"));
+            assertTrue(json.has("message"));
+            assertTrue(json.has("level"));
+        }
+    }
 }
@@ -20,9 +20,8 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import com.fasterxml.jackson.core.JsonProcessingException;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.TestMethodOrder;
 import org.keycloak.it.junit5.extension.CLIResult;
 import org.keycloak.it.junit5.extension.DistributionTest;
 import org.keycloak.it.junit5.extension.RawDistOnly;
@@ -32,7 +31,6 @@
 
 @DistributionTest(reInstall = DistributionTest.ReInstall.NEVER)
 @RawDistOnly(reason = "Too verbose for docker and enough to check raw dist")
-@TestMethodOrder(OrderAnnotation.class)
 public class LoggingDistTest {
 
     @Test
@@ -77,4 +75,21 @@ void testSetLogFormat(LaunchResult result) {
         assertFalse(cliResult.getOutput().contains("(keycloak-cache-init)"));
         cliResult.assertStartedDevMode();
     }
+
+    @Test
+    @Launch({ "start-dev", "--log-json-enabled=true" })
+    void testJsonFormatApplied(LaunchResult result) throws JsonProcessingException {
+        CLIResult cliResult = (CLIResult) result;
+        cliResult.assertJsonLogDefaultsApplied();
+        cliResult.assertStartedDevMode();
+    }
+
+    @Test
+    @Launch({ "start-dev", "--log-level=off,org.keycloak:debug,org.infinispan:info", "--log-json-enabled=true" })
+    void testLogLevelSettingsAppliedWhenJsonEnabled(LaunchResult result) {
+        CLIResult cliResult = (CLIResult) result;
+        assertFalse(cliResult.getOutput().contains("\"loggerName\":\"io.quarkus\",\"level\":\"INFO\")"));
+        assertTrue(cliResult.getOutput().contains("\"loggerName\":\"org.keycloak.quarkus.runtime.storage.database.jpa.QuarkusJpaConnectionProviderFactory\",\"level\":\"DEBUG\""));
+        assertTrue(cliResult.getOutput().contains("\"loggerName\":\"org.infinispan.CONTAINER\",\"level\":\"INFO\""));
+    }
 }
@@ -106,6 +106,8 @@ Logging:
                      The format of log entries. If the format has spaces in it, you need to escape
                        the value such as "<format>". Default: %d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c]
                        (%t) %s%e%n.
+--log-json-enabled <true|false>
+                     Enable or disable logging to console using structured JSON. Default: false.
 --log-level <category:level>
                      The log level of the root category or a comma-separated list of individual
                        categories and their levels. For the root category, you don't need to

@@ -148,6 +148,8 @@ Logging:
                      The format of log entries. If the format has spaces in it, you need to escape
                        the value such as "<format>". Default: %d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c]
                        (%t) %s%e%n.
+--log-json-enabled <true|false>
+                     Enable or disable logging to console using structured JSON. Default: false.
 --log-level <category:level>
                      The log level of the root category or a comma-separated list of individual
                        categories and their levels. For the root category, you don't need to

@@ -109,6 +109,8 @@ Logging:
                      The format of log entries. If the format has spaces in it, you need to escape
                        the value such as "<format>". Default: %d{yyyy-MM-dd HH:mm:ss,SSS} %-5p [%c]
                        (%t) %s%e%n.
+--log-json-enabled <true|false>
+                     Enable or disable logging to console using structured JSON. Default: false.
 --log-level <category:level>
                      The log level of the root category or a comma-separated list of individual
                        categories and their levels. For the root category, you don't need to