1 files changed, 215 insertions, 0 deletions
diff --git a/src/lib/log/logger_level_impl.cc b/src/lib/log/logger_level_impl.cc
new file mode 100644
index 0000000..a4aba73
--- /dev/null
+++ b/src/lib/log/logger_level_impl.cc
@@ -0,0 +1,215 @@
+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <algorithm>
+#include <string.h>
+#include <iostream>
+#include <boost/lexical_cast.hpp>
+
+#include <log4cplus/logger.h>
+
+#include <log/logger_level.h>
+#include <log/logger_level_impl.h>
+#include <log/logimpl_messages.h>
+#include <log/macros.h>
+
+using namespace log4cplus;
+using namespace std;
+
+namespace {
+isc::log::Logger logger("log");
+}
+
+namespace isc {
+namespace log {
+
+// Convert Kea level to a log4cplus logging level.
+log4cplus::LogLevel
+LoggerLevelImpl::convertFromBindLevel(const Level& level) {
+
+    // Kea logging levels are small integers so we can do a table lookup
+    static const log4cplus::LogLevel log4cplus_levels[] = {
+        log4cplus::NOT_SET_LOG_LEVEL,
+        log4cplus::DEBUG_LOG_LEVEL,
+        log4cplus::INFO_LOG_LEVEL,
+        log4cplus::WARN_LOG_LEVEL,
+        log4cplus::ERROR_LOG_LEVEL,
+        log4cplus::FATAL_LOG_LEVEL,
+        log4cplus::OFF_LOG_LEVEL
+    };
+
+    // ... with compile-time checks to ensure that table indexes are correct.
+    BOOST_STATIC_ASSERT(static_cast<int>(DEFAULT) == 0);
+    BOOST_STATIC_ASSERT(static_cast<int>(DEBUG) == 1);
+    BOOST_STATIC_ASSERT(static_cast<int>(INFO) == 2);
+    BOOST_STATIC_ASSERT(static_cast<int>(WARN) == 3);
+    BOOST_STATIC_ASSERT(static_cast<int>(ERROR) == 4);
+    BOOST_STATIC_ASSERT(static_cast<int>(FATAL) == 5);
+    BOOST_STATIC_ASSERT(static_cast<int>(NONE) == 6);
+
+    // Do the conversion
+    if (level.severity == DEBUG) {
+
+        // Debug severity, so the log4cplus level returned depends on the
+        // debug level.  Silently limit the debug level to the range
+        // MIN_DEBUG_LEVEL to MAX_DEBUG_LEVEL (avoids the hassle of throwing
+        // and catching exceptions and besides, this is for debug information).
+        int limited = std::max(MIN_DEBUG_LEVEL,
+                               std::min(level.dbglevel, MAX_DEBUG_LEVEL));
+        LogLevel newlevel = static_cast<int>(DEBUG_LOG_LEVEL -
+                                            (limited - MIN_DEBUG_LEVEL));
+        return (static_cast<log4cplus::LogLevel>(newlevel));
+
+    } else {
+
+        // Can do a table lookup to speed things up.  There is no need to check
+        // that the index is out of range.  That the variable is of type
+        // isc::log::Severity ensures that it must be one of the Severity enum
+        // members - conversion of a numeric value to an enum is not permitted.
+        return (log4cplus_levels[level.severity]);
+    }
+}
+
+// Convert log4cplus logging level to Kea debug level.  It is up to the
+// caller to validate that the debug level is valid.
+Level
+LoggerLevelImpl::convertToBindLevel(const log4cplus::LogLevel loglevel) {
+
+    // Not easy to do a table lookup as the numerical values of log4cplus levels
+    // are quite high.
+    if (loglevel <= log4cplus::NOT_SET_LOG_LEVEL) {
+        return (Level(DEFAULT));
+
+    } else if (loglevel <= log4cplus::DEBUG_LOG_LEVEL) {
+
+        // Debug severity, so extract the debug level from the numeric value.
+        // If outside the limits, change the severity to the level above or
+        // below.
+        int dbglevel = MIN_DEBUG_LEVEL +
+                       static_cast<int>(log4cplus::DEBUG_LOG_LEVEL) -
+                       static_cast<int>(loglevel);
+        if (dbglevel > MAX_DEBUG_LEVEL) {
+            return (Level(DEFAULT));
+        } else if (dbglevel < MIN_DEBUG_LEVEL) {
+            return (Level(INFO));
+        }
+        return (Level(DEBUG, dbglevel));
+
+    } else if (loglevel <= log4cplus::INFO_LOG_LEVEL) {
+        return (Level(INFO));
+
+    } else if (loglevel <= log4cplus::WARN_LOG_LEVEL) {
+        return (Level(WARN));
+
+    } else if (loglevel <= log4cplus::ERROR_LOG_LEVEL) {
+        return (Level(ERROR));
+
+    } else if (loglevel <= log4cplus::FATAL_LOG_LEVEL) {
+        return (Level(FATAL));
+
+    }
+
+    return (Level(NONE));
+}
+
+
+// Convert string to appropriate logging level
+log4cplus::LogLevel
+LoggerLevelImpl::logLevelFromString(const log4cplus::tstring& level) {
+
+    std::string name = level;       // Get to known type
+    size_t length = name.size();    // Length of the string
+
+    if (length < 5) {
+
+        // String can't possibly start DEBUG so we don't know what it is.
+        // As per documentation, return NOT_SET level.
+        return (NOT_SET_LOG_LEVEL);
+    } else {
+        if (strncasecmp(name.c_str(), "DEBUG", 5) == 0) {
+
+            // String starts "DEBUG" (or "debug" or any case mixture).  The
+            // rest of the string - if any - should be a number.
+            if (length == 5) {
+
+                // It is plain "DEBUG".  Take this as level 0.
+                return (DEBUG_LOG_LEVEL);
+            } else {
+
+                // Try converting the remainder to an integer.  The "5" is
+                // the length of the string "DEBUG".  Note that if the number
+                // is outside the range of debug levels, it is coerced to the
+                // nearest limit.  Thus a level of DEBUG509 will end up as
+                // if DEBUG99 has been specified.
+                try {
+                    int dbglevel = boost::lexical_cast<int>(name.substr(5));
+                    if (dbglevel < MIN_DEBUG_LEVEL) {
+                        LOG_WARN(logger, LOGIMPL_BELOW_MIN_DEBUG).arg(dbglevel)
+                            .arg(MIN_DEBUG_LEVEL);
+                        dbglevel = MIN_DEBUG_LEVEL;
+
+                    } else if (dbglevel > MAX_DEBUG_LEVEL) {
+                        LOG_WARN(logger, LOGIMPL_ABOVE_MAX_DEBUG).arg(dbglevel)
+                            .arg(MAX_DEBUG_LEVEL);
+                        dbglevel = MAX_DEBUG_LEVEL;
+
+                    }
+                    return convertFromBindLevel(Level(DEBUG, dbglevel));
+                }
+                catch (const boost::bad_lexical_cast&) {
+                    LOG_ERROR(logger, LOGIMPL_BAD_DEBUG_STRING).arg(name);
+                    return (NOT_SET_LOG_LEVEL);
+                }
+            }
+        } else {
+
+            // Unknown string - return default.  Log4cplus will call any other
+            // registered conversion functions to interpret it.
+            return (NOT_SET_LOG_LEVEL);
+        }
+    }
+}
+
+// Convert logging level to string.  If the level is a valid debug level,
+// return the string DEBUG, else return the empty string.
+#if LOG4CPLUS_VERSION < LOG4CPLUS_MAKE_VERSION(2, 0, 0)
+LoggerLevelImpl::LogLevelString
+#else
+const LoggerLevelImpl::LogLevelString&
+#endif
+LoggerLevelImpl::logLevelToString(log4cplus::LogLevel level) {
+    Level bindlevel = convertToBindLevel(level);
+    Severity& severity = bindlevel.severity;
+    int& dbglevel = bindlevel.dbglevel;
+    static LoggerLevelImpl::LogLevelString debug_ = tstring("DEBUG");
+    static LoggerLevelImpl::LogLevelString empty_ = tstring();
+
+    if ((severity == DEBUG) &&
+        ((dbglevel >= MIN_DEBUG_LEVEL) && (dbglevel <= MAX_DEBUG_LEVEL))) {
+        return (debug_);
+    }
+
+    // Unknown, so return empty string for log4cplus to try other conversion
+    // functions.
+    return (empty_);
+}
+
+// Initialization.  Register the conversion functions with the LogLevelManager.
+void
+LoggerLevelImpl::init() {
+
+    // Get the singleton log-level manager.
+    LogLevelManager& manager = getLogLevelManager();
+
+    // Register the conversion functions
+    manager.pushFromStringMethod(LoggerLevelImpl::logLevelFromString);
+    manager.pushToStringMethod(LoggerLevelImpl::logLevelToString);
+}
+
+} // namespace log
+} // namespace isc