[UPDATE] Only one error log

modules/infrastructure/log-writer/build.gradle

@@ -14,7 +14,6 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.17.2'
 
     runtimeOnly 'com.mysql:mysql-connector-j:8.3.0'
-    compileOnly 'jakarta.annotation:jakarta.annotation-api:2.1.1'
 
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/SystemValidator.java

@@ -53,7 +53,7 @@ private void checkRegularly(){
     }
 
     private void checkCommandInstalled(String command) {
-        List<String> results = new TransientProcess("which " + command).results();
+        List<String> results = new TransientProcess("which " + command).resultList();
         if (results.isEmpty() || !results.get(0).contains("/")) {
             throw new IllegalStateException(command + "가 설치되지 않았습니다.");
         }
@@ -78,7 +78,7 @@ private void checkNetworkInterfaces(List<NetworkInterface> system, List<NetworkI
     private List<NetworkInterface> getSystemNetworkInterfaces() {
         List<NetworkInterface> interfaces = new ArrayList<>();
 
-        List<String> iwconfigOutput = new TransientProcess("iwconfig").results();
+        List<String> iwconfigOutput = new TransientProcess("iwconfig").resultList();
 
         String currentName = null;
         String currentEssid = null;

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/ContinuousProcess.java

@@ -13,22 +13,23 @@
 public class ContinuousProcess {
     protected Process process;
     protected NonBlockingBufferedReader br;
+    //기본 생성자를 호출했을 땐 ebr이 null일 수 있다.
+    @Nullable
+    protected NonBlockingBufferedReader ebr = null;
 
+    //sub class에서 자신만의 Process를 정의하고 싶을 때 사용
+    //super()는 생성자의 첫 번째 줄에 있어야 하기 때문에 만든 것임
     public ContinuousProcess() {}
 
-    public ContinuousProcess(Process process) {
-        this.process = process;
-        this.br = new NonBlockingBufferedReader(new BufferedReader(new InputStreamReader(process.getInputStream())));
-    }
     public ContinuousProcess(String command) {
         this(command, null);
     }
     public ContinuousProcess(String command, @Nullable String sudoPassword) {
         try {
             this.process = new ProcessBuilder(command.split(" "))
-                    .redirectErrorStream(true)
                     .start();
             this.br = new NonBlockingBufferedReader(new BufferedReader(new InputStreamReader(this.process.getInputStream())));
+            this.ebr = new NonBlockingBufferedReader(new BufferedReader(new InputStreamReader(this.process.getErrorStream())));
             if (sudoPassword==null) return;
             Writer writer = new OutputStreamWriter(this.process.getOutputStream());
             writer.write(sudoPassword + System.lineSeparator());
@@ -37,7 +38,6 @@ public ContinuousProcess(String command, @Nullable String sudoPassword) {
             throw new RuntimeException(command + " 실행 실패");
         }
     }
-
     /**
      * @return 프로세스의 출력에서 한 줄을 읽어들인다.
      * 읽을 줄이 없을경우 null을 출력한다.
@@ -49,6 +49,30 @@ public String readLine(){
             throw new RuntimeException(e);
         }
     }
+
+    /**
+     * @return 프로세스의 에러 출력에서 한 줄을 읽어들인다.
+     * 읽을 줄이 없을경우 null을 출력한다.
+     */
+    public String readErrorLine(){
+        if (this.ebr == null)
+            throw new RuntimeException("error stream을 초기화하지 않았습니다!");
+        try {
+            return this.ebr.readLine();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public String readErrorLines(){
+        StringBuilder sb = new StringBuilder();
+        String line;
+        while((line = readErrorLine()) != null){
+            sb.append(line).append("\n");
+        }
+        return sb.toString();
+    }
+
     public boolean isAlive(){
         return this.process.isAlive();
     }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/common/process/TransientProcess.java

@@ -11,16 +11,15 @@
 
 //실행 후 종료되어 모든 출력을 얻는 프로세스
 //출력 스트림을 통한 프로세스와의 상호작용은 없다.
+
 public class TransientProcess {
+
     protected BufferedReader br;
+    protected BufferedReader ebr;
     protected Process process;
 
     public TransientProcess() {}
 
-    public TransientProcess(Process process){
-        this.process = process;
-        this.br = new BufferedReader(new InputStreamReader(process.getInputStream()));
-    }
     public TransientProcess(String command){
         this(command, null);
     }
@@ -30,6 +29,7 @@ public TransientProcess(String command, @Nullable String sudoPassword) {
                     .redirectErrorStream(true)
                     .start();
             this.br = new BufferedReader(new InputStreamReader(process.getInputStream()));
+            this.ebr = new BufferedReader(new InputStreamReader(process.getErrorStream()));
             if (sudoPassword==null) return;
             Writer writer = new OutputStreamWriter(this.process.getOutputStream());
             writer.write(sudoPassword + System.lineSeparator());
@@ -39,12 +39,28 @@ public TransientProcess(String command, @Nullable String sudoPassword) {
         }
     }
 
+    public String resultString(){
+        return resultString(this.br);
+    }
+
+    public List<String> resultList(){
+        return resultList(this.br);
+    }
+
+    public String errorResultString(){
+        return resultString(this.ebr);
+    }
+
+    public List<String> errorResultList(){
+        return resultList(this.ebr);
+    }
+
     //종료되었을 때 출력을 얻는다.
     //종료되지 않았다면 블로킹된다.
     //출력이 없는 프로세스의 경우 빈 리스트를 출력한다.
-    public List<String> results(){
+    private List<String> resultList(BufferedReader br){
+        waitTermination();
         List<String> logs = new ArrayList<>();
-
         try {
             String line;
             while((line = br.readLine()) != null){
@@ -53,7 +69,31 @@ public List<String> results(){
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
-
         return logs;
     }
+
+    //결과를 하나의 String으로 반환
+    private String resultString(BufferedReader br){
+        waitTermination();
+        StringBuilder sb = new StringBuilder();
+        try {
+            int size=1024;
+            char[] buff = new char[size];
+            int read;
+            while((read = br.read(buff, 0, size)) != -1){
+                sb.append(buff, 0, read);
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return sb.toString();
+    }
+
+    public void waitTermination(){
+        try {
+            process.waitFor();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
 }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogProcess.java

@@ -2,29 +2,10 @@
 
 import com.whoz_in.log_writer.common.process.TransientProcess;
 import com.whoz_in.log_writer.managed.ManagedInfo;
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
 
 public class ArpLogProcess extends TransientProcess {
     public ArpLogProcess(ManagedInfo info, String password) {
-        try {
-            //TODO: error 처리 로직 수정
-            super.process = new ProcessBuilder(info.command().split(" "))
-                    //arp-scan 실행할 때마다 아래와 같은 오류가 떠서 일단 Error Stream 출력 안하도록 했음
-                    // WARNING: Cannot open MAC/Vendor file ieee-oui.txt: Permission denied
-//                    .redirectError(Redirect.INHERIT)
-                    .start();
-            super.br = new BufferedReader(new InputStreamReader(process.getInputStream()));
-            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));
-            bw.write(password);
-            bw.newLine();
-            bw.flush();
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
+        super(info.command(), password);
     }
 
 }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/arp/ArpLogWriter.java

@@ -14,6 +14,7 @@
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+//TODO: 에러 로그 어떻게 관리할지 생각. 일단 TransientProcess라서 구현 안함
 @Slf4j
 @Component
 public class ArpLogWriter {
@@ -38,7 +39,7 @@ private void scan() {
         List<ManagedLog> logs= arpList.stream()
                 .flatMap(arpInfo-> {
                     ArpLogProcess proc = new ArpLogProcess(arpInfo, sudoPassword); //프로세스 실행
-                    List<String> lines = proc.results(); //프로세스의 모든 출력 가져오기
+                    List<String> lines = proc.resultList(); //프로세스의 모든 출력 가져오기
                     Set<ManagedLog> procLogs = lines.stream() //출력 라인들을 ManagedLog 변환하며 ssid도 넣어줌
                             .filter(parser::validate)
                             .map(line->{
@@ -54,6 +55,7 @@ private void scan() {
                     따라서 Arp-scan의 경우 무조건 1개 이상의 결과가 나오므로 0개라면 실행 실패라고 판단한다.
                      */
                     if (procLogs.isEmpty()) {
+                        //SystemValidator가 시스템의 네트워크 인터페이스가 올바른지 검증하기 때문에 여기서는 warn으로 로깅
                         log.warn("[managed - arp({})] 실행 실패 : ERROR", arpInfo.ssid());
                         return Stream.empty();
                     }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogProcess.java

@@ -1,29 +1,11 @@
 package com.whoz_in.log_writer.managed.mdns;
 
 import com.whoz_in.log_writer.common.process.ContinuousProcess;
-import com.whoz_in.log_writer.common.util.NonBlockingBufferedReader;
 import com.whoz_in.log_writer.managed.ManagedInfo;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
-import java.io.Writer;
-import java.lang.ProcessBuilder.Redirect;
 
 public class MdnsLogProcess extends ContinuousProcess {
 
     public MdnsLogProcess(ManagedInfo info, String sudoPassword) {
-        try {
-            super.process = new ProcessBuilder(info.command().split(" "))
-                    .redirectError(Redirect.INHERIT)
-                    .start();
-            super.br = new NonBlockingBufferedReader(new BufferedReader(new InputStreamReader(this.process.getInputStream())));
-            Writer writer = new OutputStreamWriter(this.process.getOutputStream());
-            writer.write(sudoPassword + System.lineSeparator());
-            writer.flush();
-        } catch (IOException e) {
-
-            throw new RuntimeException(info.command() + " 실행 실패");
-        }
+        super(info.command(), sudoPassword);
     }
 }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/managed/mdns/MdnsLogWriter.java

@@ -7,16 +7,17 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+//TODO: tshark가 종료되지 않더라도 오류가 발생할 수 있으려나? 이 경우에도 로깅이 필요하긴 함
 @Slf4j
 @Component
 public class MdnsLogWriter {
     private final Map<ManagedInfo, MdnsLogProcess> processes;
+    private final Map<ManagedInfo, Boolean> wasDead;
     private final MdnsLogParser parser;
     private final ManagedLogDAO dao;
     private final String sudoPassword;
@@ -25,11 +26,13 @@ public MdnsLogWriter(ManagedLogDAO dao, MdnsLogParser parser, NetworkConfig conf
         this.dao = dao;
         this.parser = parser;
         this.sudoPassword = sudoPassword;
-        this.processes = config.getMdnsList().parallelStream()
-                .collect(Collectors.toMap(
-                        managedInfo -> managedInfo,
-                        managedInfo -> new MdnsLogProcess(managedInfo, sudoPassword)
-                ));
+        this.processes = new HashMap<>();
+        this.wasDead = new HashMap<>();
+        config.getMdnsList().parallelStream()
+                .forEach(managedInfo -> {
+                    this.processes.put(managedInfo, new MdnsLogProcess(managedInfo, sudoPassword));
+                    this.wasDead.put(managedInfo, false);
+                });
     }
 
     @Scheduled(initialDelay = 10000, fixedDelay = 10000)
@@ -39,7 +42,10 @@ private void writeLogs() {
                     ManagedInfo managedInfo = entry.getKey();
                     MdnsLogProcess process = entry.getValue();
                     boolean alive = process.isAlive();
-                    if (!alive) log.error("[managed - mdns({})] dead", managedInfo.ssid());
+                    if (!alive && wasDead.get(managedInfo).equals(Boolean.FALSE)) {
+                        wasDead.put(managedInfo, true);
+                        log.error("[managed - mdns({})] dead :\n{}", managedInfo.ssid(), process.readErrorLines());
+                    }
                     return alive;})
                 .flatMap(entry -> {
                     ManagedInfo managedInfo = entry.getKey();

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/ChannelHopper.java

@@ -25,7 +25,7 @@ public ChannelHopper(NetworkInterface monitor, @Value("${sudo_password}") String
     @Scheduled(initialDelay = 5000, fixedDelay = 1000)
     public void hop(){
         if (!channelsToHop.iterator().hasNext()) {
-            Set<Integer> channels = new TransientProcess("nmcli -f SSID,CHAN dev wifi").results()
+            Set<Integer> channels = new TransientProcess("nmcli -f SSID,CHAN dev wifi").resultList()
                     .stream()
                     .map(line -> line.trim().split("\\s+"))
                     .filter(split -> (split.length == 2) && split[1].matches("\\d+"))

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogProcess.java

@@ -1,32 +1,12 @@
 package com.whoz_in.log_writer.monitor;
 
 import com.whoz_in.log_writer.common.process.ContinuousProcess;
-import com.whoz_in.log_writer.common.util.NonBlockingBufferedReader;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
-import java.io.Writer;
-import java.lang.ProcessBuilder.Redirect;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
 public final class MonitorLogProcess extends ContinuousProcess {
 
     public MonitorLogProcess(MonitorInfo info, String sudoPassword) {
-        try {
-            super.process = new ProcessBuilder(info.command().split(" "))
-                    .redirectError(Redirect.INHERIT)
-                    .start();
-            super.br = new NonBlockingBufferedReader(new BufferedReader(new InputStreamReader(process.getInputStream())));
-
-            Writer writer = new OutputStreamWriter(process.getOutputStream());
-            writer.write(sudoPassword + System.lineSeparator());
-            writer.flush();
-        } catch (IOException e) {
-            String message = info.command() + " 실행 실패";
-            log.error(message);
-            throw new RuntimeException(message);
-        }
+        super(info.command(), sudoPassword);
     }
 }

modules/infrastructure/log-writer/src/main/java/com/whoz_in/log_writer/monitor/MonitorLogWriter.java

@@ -12,6 +12,7 @@
 @Component
 public class MonitorLogWriter {
     private MonitorLogProcess process; //교체될 수 있으므로 final X
+    private Boolean wasDead = false;
     private final MonitorLogParser parser;
     private final MonitorLogDAO repo;
     private final String sudoPassword;
@@ -27,7 +28,10 @@ public MonitorLogWriter(MonitorLogParser parser, MonitorLogDAO repo, NetworkConf
     @Scheduled(initialDelay = 10000, fixedDelay = 10000)
     private void saveLogs(){
         if (!process.isAlive()) {
-            log.error("[monitor] dead");
+            if (wasDead.equals(Boolean.FALSE)) {
+                log.error("[monitor] dead:\n{}", process.readErrorLines());
+                wasDead = true;
+            }
             return;
         }
         Set<String> macs = new HashSet<>();