/*

 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "logging/log.hpp"

#include "memory/allocation.inline.hpp"

void LogWriteHelper::write_large(LogTagSet& lts,

                                 LogLevelType level,

                                 const char* prefix,

                                 size_t prefix_len,

                                 size_t msg_len,

                                 const char* fmt,

                                 va_list args) {

  size_t newbuf_len = prefix_len + msg_len + 1;

  char* newbuf = NEW_C_HEAP_ARRAY(char, newbuf_len, mtLogging);

  memcpy(newbuf, prefix, prefix_len);

  int ret = os::log_vsnprintf(newbuf + prefix_len, newbuf_len - prefix_len, fmt, args);

  assert(ret >= 0, "Log message buffer issue");

  lts.log(level, newbuf);

  FREE_C_HEAP_ARRAY(char, newbuf);

}

/////////////// Unit tests ///////////////

#ifndef PRODUCT

#include "logging/log.hpp"

#include "logging/logConfiguration.hpp"

#include "logging/logOutput.hpp"

#include "memory/resourceArea.hpp"

#define assert_str_eq(s1, s2) \

  assert(strcmp(s1, s2) == 0, "Expected '%s' to equal '%s'", s1, s2)

#define assert_char_in(c, s) \

  assert(strchr(s, c) != NULL, "Expected '%s' to contain character '%c'", s, c)

#define assert_char_not_in(c, s) \

  assert(strchr(s, c) == NULL, "Expected '%s' to *not* contain character '%c'", s, c)

class TestLogFile {

 private:

  char file_name[256];

  void set_name(const char* test_name) {

    const char* tmpdir = os::get_temp_directory();

    int pos = jio_snprintf(file_name, sizeof(file_name), "%s%svmtest.%s.%d.log", tmpdir, os::file_separator(), test_name, os::current_process_id());

    assert(pos > 0, "too small log file name buffer");

    assert((size_t)pos < sizeof(file_name), "too small log file name buffer");

  }

 public:

  TestLogFile(const char* test_name) {

    set_name(test_name);

    remove(name());

  }

  ~TestLogFile() {

    remove(name());

  }

  const char* name() {

    return file_name;

  }

};

class TestLogSavedConfig {

 private:

  char* _saved_config;

  char* _new_output;

  LogHandle(logging) _log;

 public:

  TestLogSavedConfig(const char* apply_output = NULL, const char* apply_setting = NULL) : _new_output(0) {

    _saved_config = os::strdup_check_oom(LogOutput::Stdout->config_string());

    bool success = LogConfiguration::parse_log_arguments("stdout", "all=off", NULL, NULL, _log.error_stream());

    assert(success, "test unable to turn all off");

    if (apply_output) {

      _new_output = os::strdup_check_oom(apply_output);

      bool success = LogConfiguration::parse_log_arguments(_new_output, apply_setting,  NULL, NULL, _log.error_stream());

      assert(success, "test unable to apply test log configuration");

    }

  }

  ~TestLogSavedConfig() {

    if (_new_output) {

      bool success = LogConfiguration::parse_log_arguments(_new_output, "all=off", NULL, NULL, _log.error_stream());

      assert(success, "test unable to turn all off");

      os::free(_new_output);

    }

    bool success = LogConfiguration::parse_log_arguments("stdout", _saved_config, NULL, NULL, _log.error_stream());

    assert(success, "test unable to restore log configuration");

    os::free(_saved_config);

  }

};

void Test_configure_stdout() {

  ResourceMark rm;

  LogOutput* stdoutput = LogOutput::Stdout;

  TestLogSavedConfig tlsc;

  // Enable 'logging=info', verifying it has been set

  LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(logging));

  assert_str_eq("logging=info,", stdoutput->config_string());

  assert(log_is_enabled(Info, logging), "logging was not properly enabled");

  // Enable 'gc=debug' (no wildcard), verifying no other tags are enabled

  LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(gc));

  // No '+' character means only single tags are enabled, and no combinations

  assert_char_not_in('+', stdoutput->config_string());

  assert(log_is_enabled(Debug, gc), "logging was not properly enabled");

  // Enable 'gc*=trace' (with wildcard), verifying at least one tag combination is enabled (gc+...)

  LogConfiguration::configure_stdout(LogLevel::Trace, false, LOG_TAGS(gc));

  assert_char_in('+', stdoutput->config_string());

  assert(log_is_enabled(Trace, gc), "logging was not properly enabled");

  // Disable 'gc*' and 'logging', verifying all logging is properly disabled

  LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(gc));

  LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(logging));

  assert_str_eq("all=off", stdoutput->config_string());

}

static int Test_logconfiguration_subscribe_triggered = 0;

static void Test_logconfiguration_subscribe_helper() {

  Test_logconfiguration_subscribe_triggered++;

}

void Test_logconfiguration_subscribe() {

  ResourceMark rm;

  LogHandle(logging) log;

  TestLogSavedConfig log_cfg("stdout", "logging+test=trace");

  LogConfiguration::register_update_listener(&Test_logconfiguration_subscribe_helper);

  LogConfiguration::parse_log_arguments("stdout", "logging=trace", NULL, NULL, log.error_stream());

  assert(Test_logconfiguration_subscribe_triggered == 1, "subscription not triggered (1)");

  LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(gc));

  assert(Test_logconfiguration_subscribe_triggered == 2, "subscription not triggered (2)");

  LogConfiguration::disable_logging();

  assert(Test_logconfiguration_subscribe_triggered == 3, "subscription not triggered (3)");

  // We need to renable stderr error logging since "disable_logging" disable it all.

  // TestLogSavedConfig log_cfg will only renable stdout for us.

  LogConfiguration::parse_log_arguments("stderr", "all=warning", NULL, NULL, log.error_stream());

  assert(Test_logconfiguration_subscribe_triggered == 4, "subscription not triggered (3)");

}

#define LOG_PREFIX_STR "THE_PREFIX "

#define LOG_LINE_STR "a log line"

size_t Test_log_prefix_prefixer(char* buf, size_t len) {

  int ret = jio_snprintf(buf, len, LOG_PREFIX_STR);

  assert(ret > 0, "Failed to print prefix. Log buffer too small?");

  return (size_t) ret;

}

void Test_log_prefix() {

  ResourceMark rm;

  TestLogFile log_file("log_prefix");

  TestLogSavedConfig log_cfg(log_file.name(), "logging+test=trace");

  log_trace(logging, test)(LOG_LINE_STR);

  FILE* fp = fopen(log_file.name(), "r");

  assert(fp, "File read error");

  char output[1024];

  if (fgets(output, 1024, fp) != NULL) {

    assert(strstr(output, LOG_PREFIX_STR LOG_LINE_STR), "logging prefix error");

  }

  fclose(fp);

}

void Test_log_big() {

  char big_msg[4096] = {0};

  char Xchar = '~';

  ResourceMark rm;

  TestLogFile log_file("log_big");

  TestLogSavedConfig log_cfg(log_file.name(), "logging+test=trace");

  memset(big_msg, Xchar, sizeof(big_msg) - 1);

  log_trace(logging, test)("%s", big_msg);

  FILE* fp = fopen(log_file.name(), "r");

  assert(fp, "File read error");

  char output[sizeof(big_msg)+128 /*decorators*/ ];

  if (fgets(output, sizeof(output), fp) != NULL) {

    assert(strstr(output, LOG_PREFIX_STR), "logging prefix error");

    size_t count = 0;

    for (size_t ps = 0 ; output[ps + count] != '\0'; output[ps + count] == Xchar ? count++ : ps++);

    assert(count == (sizeof(big_msg) - 1) , "logging msg error");

  }

  fclose(fp);

}

void Test_logtagset_duplicates() {

  for (LogTagSet* ts = LogTagSet::first(); ts != NULL; ts = ts->next()) {

    char ts_name[512];

    ts->label(ts_name, sizeof(ts_name), ",");

    // verify that NO_TAG is never followed by a real tag

    for (size_t i = 0; i < LogTag::MaxTags; i++) {

      if (ts->tag(i) == LogTag::__NO_TAG) {

        for (i++; i < LogTag::MaxTags; i++) {

          assert(ts->tag(i) == LogTag::__NO_TAG,

                 "NO_TAG was followed by a real tag (%s) in tagset %s",

                 LogTag::name(ts->tag(i)), ts_name);

        }

      }

    }

    // verify that there are no duplicate tagsets (same tags in different order)

    for (LogTagSet* other = ts->next(); other != NULL; other = other->next()) {

      if (ts->ntags() != other->ntags()) {

        continue;

      }

      bool equal = true;

      for (size_t i = 0; i < ts->ntags(); i++) {

        LogTagType tag = ts->tag(i);

        if (!other->contains(tag)) {

          equal = false;

          break;

        }

      }

      // Since tagsets are implemented using template arguments, using both of

      // the (logically equivalent) tagsets (t1, t2) and (t2, t1) somewhere will

      // instantiate two different LogTagSetMappings. This causes multiple

      // tagset instances to be created for the same logical set. We want to

      // avoid this to save time, memory and prevent any confusion around it.

      if (equal) {

        char other_name[512];

        other->label(other_name, sizeof(other_name), ",");

        assert(false, "duplicate LogTagSets found: '%s' vs '%s' "

               "(tags must always be specified in the same order for each tagset)",

               ts_name, other_name);

      }

    }

  }

}

#endif // PRODUCT