src/lib/lttng-ust-java-agent/jni/log4j/lttng_ust_log4j2.c

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2016-2022 EfficiOS Inc.
   5  * Copyright (C) 2016 Alexandre Montplaisir <alexmonthy@efficios.com>
   6  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  */
   8
   9 #define _LGPL_SOURCE
  10 #include "org_lttng_ust_agent_log4j2_LttngLog4j2Api.h"
  11 #include "lttng_ust_log4j_tp.h"
  12 #include "../common/lttng_ust_context.h"
  13
  14 /*
  15  * Those are an exact map from the class org.apache.log4j.Level.
  16  */
  17 enum loglevel_log4j1 {
  18         LOGLEVEL_LOG4J1_OFF              = INT32_MAX,
  19         LOGLEVEL_LOG4J1_FATAL            = 50000,
  20         LOGLEVEL_LOG4J1_ERROR            = 40000,
  21         LOGLEVEL_LOG4J1_WARN             = 30000,
  22         LOGLEVEL_LOG4J1_INFO             = 20000,
  23         LOGLEVEL_LOG4J1_DEBUG            = 10000,
  24         LOGLEVEL_LOG4J1_TRACE            = 5000,
  25         LOGLEVEL_LOG4J1_ALL              = INT32_MIN,
  26 };
  27
  28 /*
  29  * Those are an exact map from the class
  30  * org.apache.logging.log4j.spi.StandardLevel.
  31  */
  32 enum loglevel_log4j2 {
  33         LOGLEVEL_LOG4J2_OFF              = 0,
  34         LOGLEVEL_LOG4J2_FATAL            = 100,
  35         LOGLEVEL_LOG4J2_ERROR            = 200,
  36         LOGLEVEL_LOG4J2_WARN             = 300,
  37         LOGLEVEL_LOG4J2_INFO             = 400,
  38         LOGLEVEL_LOG4J2_DEBUG            = 500,
  39         LOGLEVEL_LOG4J2_TRACE            = 600,
  40         LOGLEVEL_LOG4J2_ALL              = INT32_MAX,
  41 };
  42
  43 /*
  44  * The integer values of the loglevels has obviously changed in log4j2,
  45  * translate them to the values of log4j1 since they are exposed in the API of
  46  * lttng-tools.
  47  *
  48  * Custom loglevels might pose a problem when using ranges.
  49  */
  50 static jint loglevel_2x_to_1x(jint loglevel)
  51 {
  52         switch (loglevel) {
  53         case LOGLEVEL_LOG4J2_OFF:
  54                 return LOGLEVEL_LOG4J1_OFF;
  55         case LOGLEVEL_LOG4J2_FATAL:
  56                 return LOGLEVEL_LOG4J1_FATAL;
  57         case LOGLEVEL_LOG4J2_ERROR:
  58                 return LOGLEVEL_LOG4J1_ERROR;
  59         case LOGLEVEL_LOG4J2_WARN:
  60                 return LOGLEVEL_LOG4J1_WARN;
  61         case LOGLEVEL_LOG4J2_INFO:
  62                 return LOGLEVEL_LOG4J1_INFO;
  63         case LOGLEVEL_LOG4J2_DEBUG:
  64                 return LOGLEVEL_LOG4J1_DEBUG;
  65         case LOGLEVEL_LOG4J2_TRACE:
  66                 return LOGLEVEL_LOG4J1_TRACE;
  67         case LOGLEVEL_LOG4J2_ALL:
  68                 return LOGLEVEL_LOG4J1_ALL;
  69         default:
  70                 /* Handle custom loglevels. */
  71                 return loglevel;
  72         }
  73 }
  74
  75 /*
  76  * Tracepoint used by Java applications using the log4j 2.x handler.
  77  */
  78 JNIEXPORT void JNICALL Java_org_lttng_ust_agent_log4j2_LttngLog4j2Api_tracepointWithContext(JNIEnv *env,
  79                                                 jobject jobj __attribute__((unused)),
  80                                                 jstring message,
  81                                                 jstring loggerName,
  82                                                 jstring className,
  83                                                 jstring methodName,
  84                                                 jstring fileName,
  85                                                 jint lineNumber,
  86                                                 jlong timeStamp,
  87                                                 jint logLevel,
  88                                                 jstring threadName,
  89                                                 jbyteArray context_info_entries,
  90                                                 jbyteArray context_info_strings)
  91 {
  92         jboolean iscopy;
  93         const char *msg_cstr = (*env)->GetStringUTFChars(env, message, &iscopy);
  94         const char *logger_name_cstr = (*env)->GetStringUTFChars(env, loggerName, &iscopy);
  95         const char *class_name_cstr = (*env)->GetStringUTFChars(env, className, &iscopy);
  96         const char *method_name_cstr = (*env)->GetStringUTFChars(env, methodName, &iscopy);
  97         const char *file_name_cstr = (*env)->GetStringUTFChars(env, fileName, &iscopy);
  98         const char *thread_name_cstr = (*env)->GetStringUTFChars(env, threadName, &iscopy);
  99         signed char *context_info_entries_array;
 100         signed char *context_info_strings_array;
 101
 102         /*
 103          * Write these to the TLS variables, so that the UST callbacks in
 104          * lttng_ust_context.c can access them.
 105          */
 106         context_info_entries_array = (*env)->GetByteArrayElements(env, context_info_entries, &iscopy);
 107         lttng_ust_context_info_tls.ctx_entries = (struct lttng_ust_jni_ctx_entry *) context_info_entries_array;
 108         lttng_ust_context_info_tls.ctx_entries_len = (*env)->GetArrayLength(env, context_info_entries);
 109         context_info_strings_array = (*env)->GetByteArrayElements(env, context_info_strings, &iscopy);
 110         lttng_ust_context_info_tls.ctx_strings = context_info_strings_array;
 111         lttng_ust_context_info_tls.ctx_strings_len = (*env)->GetArrayLength(env, context_info_strings);
 112
 113         lttng_ust_tracepoint(lttng_log4j, event, msg_cstr, logger_name_cstr,
 114                    class_name_cstr, method_name_cstr, file_name_cstr,
 115                    lineNumber, timeStamp, loglevel_2x_to_1x(logLevel), thread_name_cstr);
 116
 117         lttng_ust_context_info_tls.ctx_entries = NULL;
 118         lttng_ust_context_info_tls.ctx_entries_len = 0;
 119         lttng_ust_context_info_tls.ctx_strings = NULL;
 120         lttng_ust_context_info_tls.ctx_strings_len = 0;
 121         (*env)->ReleaseStringUTFChars(env, message, msg_cstr);
 122         (*env)->ReleaseStringUTFChars(env, loggerName, logger_name_cstr);
 123         (*env)->ReleaseStringUTFChars(env, className, class_name_cstr);
 124         (*env)->ReleaseStringUTFChars(env, methodName, method_name_cstr);
 125         (*env)->ReleaseStringUTFChars(env, fileName, file_name_cstr);
 126         (*env)->ReleaseStringUTFChars(env, threadName, thread_name_cstr);
 127         (*env)->ReleaseByteArrayElements(env, context_info_entries, context_info_entries_array, 0);
 128         (*env)->ReleaseByteArrayElements(env, context_info_strings, context_info_strings_array, 0);
 129 }