Add slf4j logback settings and initial logstash config (#12)

backend/build.gradle

@@ -24,6 +24,12 @@ dependencies {
 //  compile "io.springfox:springfox-swagger2:2.8.0"
 //  compile "javax.xml.bind:jaxb-api:2.3.0"
 
+  compile "net.logstash.logback:logstash-logback-encoder:4.11"
+  compile "ch.qos.logback:logback-classic:$logbackVersion"
+  compile "ch.qos.logback:logback-core:$logbackVersion"
+  compile "ch.qos.logback:logback-access:$logbackVersion"
+  compile "org.slf4j:slf4j-api:$slf4jVersion"
+
   compile "com.google.protobuf:protobuf-java-util:$protocVersion"
   compile "org.eclipse.jgit:org.eclipse.jgit:$jgitVersion"
 

backend/src/main/java/castro/backend/Application.java

@@ -1,5 +1,7 @@
 package castro.backend;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -19,7 +21,10 @@
 @SpringBootApplication
 //@EnableSwagger2
 public class Application {
+  private static final Logger logger = LoggerFactory.getLogger(Application.class);
+
   public static void main(String[] args) {
+    logger.debug("Hello, Castro.");
     SpringApplication.run(Application.class, args);
   }
 

backend/src/main/java/castro/backend/controllers/RepositoryApiController.java

@@ -13,6 +13,7 @@ public class RepositoryApiController implements RepositoryApi {
 
   @Override
   public Repository repositoryImpl(String id) {
+    logger.debug("Repository {}", id);
     return Repository.newBuilder().setDomain("github.com").setMainBranch("master").setRepositoryId(id).build();
   }
 

backend/src/main/resources/logback.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
+        <destination>127.0.0.1:5000</destination>
+
+        <!-- encoder is required -->
+        <encoder class="net.logstash.logback.encoder.LogstashEncoder" />
+    </appender>
+
+    <root level="DEBUG">
+        <appender-ref ref="STDOUT" />
+        <appender-ref ref="LOGSTASH" />
+    </root>
+
+</configuration>

config/logstash/config/logstash.yml

@@ -0,0 +1,2 @@
+node:
+  name: "dev"

config/logstash/pipeline/logstash.conf

@@ -0,0 +1,15 @@
+input {
+  tcp {
+    port => 5000
+    codec => "json"
+  }
+}
+
+output {
+  elasticsearch {
+    hosts => [ "elasticsearch:9200" ]
+  }
+  stdout {
+    codec => json
+  }
+}

docker-compose.yaml

@@ -9,4 +9,17 @@ services:
       # - 9300:9300  // when using tcp port
     environment:
       ES_JAVA_OPTS: "-Xms768m -Xmx768m"
+    restart: on-failure
+
+  logstash:
+    image: 'elastic/logstash:6.3.0'
+    volumes:
+      - ./config/logstash/config/logstash.yml:/usr/share/logstash/config/logstash.yml
+      - ./config/logstash/pipeline/:/usr/share/logstash/pipeline/
+    ports:
+      - "5000:5000"
+    environment:
+      LS_JAVA_OPTS: "-Xmx256m -Xms256m"
+    depends_on:
+      - elasticsearch
     restart: on-failure

gradle.properties

@@ -6,3 +6,6 @@ yarnVersion = 1.6.0
 
 protocVersion = 3.5.1
 jgitVersion = 5.0.0.201805301535-rc2
+
+slf4jVersion = 1.7.25
+logbackVersion = 1.2.3