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JavaAgent-Plugin-Scripting_kr.md

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Scouter Plugin Guide

English Korean

Javaagent Plugin

  • Default File Location : ${directory of scouter.agent.jar}/plugin
  • 또는 설정 가능 -> plugin_dir=/aaa/bbb/ccc/plugin
  • plugin 파일에 java 코드 기록시 런타임에 동적으로 코드를 컴파일하여 로딩, 바로 적용됨
  • Plugin 종류
    • Http-service
    • Service
    • HttpCall
    • Capture
    • JDBC-Pool

Http-service Plugin(httpservice.plug)

  1. void start(WrContext $ctx, WrRequest $req, WrResponse $res) : Http Service 시작 시점
  2. void end(WrContext $ctx, WrRequest $req, WrResponse $res) : Http Service 종료 시점
  3. boolean reject(WrContext $ctx, WrRequest $req, WrResponse $res) : Http Service 시작 시점에 reject 조건 (default : false)

Service Plugin(service.plug)

hook_service_patterns 에 정의된 method 에서 호출됨

  1. void start(WrContext $ctx, HookArgs $hook) : Service 시작 시점
  2. void end(WrContext $ctx) : Service 종료 시점

HttpCall Plugin(httpcall.plug)

  1. void call(WrContext $ctx, WrHttpCallRequest $req) : Http Call 요청 시점

Capture Plugin(capture.plug)

hook_args_patterns, hook_return_patterns, hook_constructor_patterns 에 정의된 method 에서 호출됨

  1. void capArgs(WrContext $ctx, HookArgs $hook) : Method 시작 시점
  2. void capReturn(WrContext $ctx, HookReturn $hook) : Method Return 시점
  3. void capThis(WrContext $ctx, String $class, String $desc, Object $this) : Constructor 생성 시점

JDBC-Pool Plugin(jdbcpool.plug)

  1. String url(WrContext $ctx, String $msg, Object $pool) : DB Connection URL 요청 시점

API

Common API

  • void log(Object c) : Logger를 통한 log
  • void println(Object c) : System.out를 통한 log
  • Object getFieldValue(Object o, String fieldName) : get field value as object of 'o'
  • Object invokeMethod(Object o, String methodName) : invoke the method
  • Object invokeMethod(Object o, String methodName, Object[] args) : invoke the method with args
  • Object invokeMethod(Object o, String methodName, Class[] argTypes, Object[] args) : invoke the method with args
  • Object newInstance(String className) : new instance of the class
  • Object newInstance(String className, ClassLoader loader) : new instance of the class from the classloader
  • Object newInstance(String className, Object[] args) : new instance of the class with arguments
  • Object newInstance(String className, ClassLoader loader, Object[] args) : new instance of the class with arguments from the classloader
  • Object newInstance(String className, ClassLoader loader, Class[] argTypes, Object[] args) : new instance of the class with arguments from the classloader
  • String toString(Object o) : Object 를 toString 하여 반환
  • String toString(Object o, String def) : Object 를 toString 하여 반환, null 이면 default string 반환
  • void alert(char level, String title, String message) : Alert 을 보냄 (level : i|w|e|f as info, warn, error, fatal).
  • Class[] makeArgTypes(Class class0, Class class1, ..., classN) : assemble argument types array to call the reflection method invokeMethod()
  • Object[] makeArgs(Object obj0, Object obj1, ..., objN) : assemble arguments array to call the reflection method invokeMethod()

WrContext class API

  • String service() : Service Name 을 반환
  • void service(String name) : Service Name 을 set
  • int serviceHash() : Service Hash 값을 반환
  • void remoteIp(String ip) : Remote IP 을 set
  • String remoteIp() : Remote IP를 반환
  • void error(String err) : 임의의 error 를 주입
  • boolean isError() : 에러 체크
  • void group(String group) : 임의의 group을 set
  • String group() : Group을 반환
  • void login(String id) : 임의의 사용자 ID 를 set
  • String login() : 사용자 ID를 반환
  • void desc(String desc) : 임의의 Desc를 set
  • String desc() : Desc를 반환
  • String httpMethod() : Http Method를 반환
  • String httpQuery() : Http Query를 반환
  • String httpContentType() : Http Content-type을 반환
  • String userAgent() : User-Agent를 반환
  • void profile(String msg) : Msg 를 profile에 기록
  • void hashProfile(String msg, int value, int elapsed) : profile a message as hash value to the XLog profile
  • parameterizedProfile(int level, String msgFormat, int elapsed, String[] params) : profile a message format with parameters.
    • message example : "Hello, my name is %s and my age is %s"
    • level : 0-debug, 1-info, 2-warn, 3-error, 4-fatal
  • long txid() : txid 를 반환
  • long gxid() : gxid 를 반환
  • TraceContext inner() : context를 반환

WrRequest class API

  • String getCookie(String key) : Cookie 값을 반환
  • String getRequestURI() : Request URI를 반환
  • String getRemoteAddr() : Remote Address를 반환
  • String getMethod() : Method 를 반환
  • String getQueryString() : Query String을 반환
  • String getParameter(String key) : Parameter를 반환
  • Object getAttribute(String key) : Attribute를 반환
  • String getHeader(String key) : Header값을 반환
  • Enumeration getParameterNames() : Parameter 값들을 반환
  • Enumeration getHeaderNames() : HeaderName들을 반환
  • WrSession getSession() : WrSession객체를 반환
  • Set getSessionNames() : Session Name들을 반환
  • Object getSessionAttribute(String key) : Session 값을 반환
  • Object inner() : Request Object를 반환
  • boolean isOk() : Plugin 상태 확인
  • Throwable error() : Error 확인

WrResponse class API

  • PrintWriter getWriter() : Writer를 반환
  • String getContentType() : Content-type을 반환
  • String getCharacterEncoding() : Character-encoding을 반환
  • Object inner() : Response Object를 반환
  • boolean isOk() : Plugin 상태 확인
  • Throwable error() : Error 확인

WrSession class API

  • getAttribute(String key) : Attribute를 반환
  • Enumeration getAttributeNames() : Attribute Names를 반환
  • Object inner() : Session Object를 반환
  • boolean isOk() : Plugin 상태 확인
  • Throwable error() : Error 확인

WrHttpCallRequest class API

  • void header(Object key, Object value) : Header값 추가
  • Object inner() : Request Object를 반환
  • boolean isOk() : Plugin 상태 확인
  • Throwable error() : Error 확인

HookArgs class API

  • String getClassName() : Class 이름 반환
  • String getMethodName() : Method 이름 반환
  • String getMethodDesc() : Method 의 Desc 반환
  • Object getThis() : this object 반환
  • Object[] getArgs() : Arguments 반환
  • int getArgCount() : Argument 갯수 반환

HookReturn class API

  • String getClassName() : Class 이름 반환
  • String getMethodName() : Method 이름 반환
  • String getMethodDesc() : Method 의 Desc 반환
  • Object getThis() : this object 반환
  • Object getReturn() : Return 값 반환