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SLF4J Simple binding for AWS Lambda
package io.microlam.slf4j.simple;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Properties;
import org.slf4j.helpers.Util;
import io.microlam.slf4j.simple.OutputChoice.OutputChoiceType;
/**
* This class holds configuration values for {@link SimpleLogger}. The
* values are computed at runtime. See {@link SimpleLogger} documentation for
* more information.
*
*
* @author Ceki Gülcü
* @author Scott Sanders
* @author Rod Waldhoff
* @author Robert Burrell Donkin
* @author Cédrik LIME
* @author Frank Afriat
*
* @since 1.7.25
*/
public class SimpleLoggerConfiguration {
enum NewlineMethod {
None, Manual;
}
private static final String CONFIGURATION_FILE = "simplelogger.properties";
static int DEFAULT_LOG_LEVEL_DEFAULT = SimpleLogger.LOG_LEVEL_INFO;
int defaultLogLevel = DEFAULT_LOG_LEVEL_DEFAULT;
private static final boolean SHOW_DATE_TIME_DEFAULT = false;
boolean showDateTime = SHOW_DATE_TIME_DEFAULT;
private static final String DATE_TIME_FORMAT_STR_DEFAULT = null;
private static String dateTimeFormatStr = DATE_TIME_FORMAT_STR_DEFAULT;
DateFormat dateFormatter = null;
private static final boolean SHOW_THREAD_NAME_DEFAULT = true;
boolean showThreadName = SHOW_THREAD_NAME_DEFAULT;
private static final boolean SHOW_AWS_REQUEST_ID_DEFAULT = true;
boolean showAWSRequestId = SHOW_AWS_REQUEST_ID_DEFAULT;
final static boolean SHOW_LOG_NAME_DEFAULT = true;
boolean showLogName = SHOW_LOG_NAME_DEFAULT;
private static final boolean SHOW_SHORT_LOG_NAME_DEFAULT = false;
boolean showShortLogName = SHOW_SHORT_LOG_NAME_DEFAULT;
private static final boolean LEVEL_IN_BRACKETS_DEFAULT = false;
boolean levelInBrackets = LEVEL_IN_BRACKETS_DEFAULT;
private static String LOG_FILE_DEFAULT = "LAMBDA";
private String logFile = LOG_FILE_DEFAULT;
OutputChoice outputChoice = null;
private static final boolean CACHE_OUTPUT_STREAM_DEFAULT = false;
private boolean cacheOutputStream = CACHE_OUTPUT_STREAM_DEFAULT;
private static final String WARN_LEVELS_STRING_DEFAULT = "WARN";
String warnLevelString = WARN_LEVELS_STRING_DEFAULT;
private static final String NEWLINE_METHOD_DEFAULT = "Auto";
NewlineMethod newlineMethod = NewlineMethod.None;
private final Properties properties = new Properties();
void init() {
loadProperties();
String defaultLogLevelString = getStringProperty(SimpleLogger.DEFAULT_LOG_LEVEL_KEY, null);
if (defaultLogLevelString != null)
defaultLogLevel = stringToLevel(defaultLogLevelString);
showLogName = getBooleanProperty(SimpleLogger.SHOW_LOG_NAME_KEY, SimpleLoggerConfiguration.SHOW_LOG_NAME_DEFAULT);
showShortLogName = getBooleanProperty(SimpleLogger.SHOW_SHORT_LOG_NAME_KEY, SHOW_SHORT_LOG_NAME_DEFAULT);
showDateTime = getBooleanProperty(SimpleLogger.SHOW_DATE_TIME_KEY, SHOW_DATE_TIME_DEFAULT);
showThreadName = getBooleanProperty(SimpleLogger.SHOW_THREAD_NAME_KEY, SHOW_THREAD_NAME_DEFAULT);
showAWSRequestId = getBooleanProperty(SimpleLogger.SHOW_AWS_REQUEST_ID_KEY, SHOW_AWS_REQUEST_ID_DEFAULT);
dateTimeFormatStr = getStringProperty(SimpleLogger.DATE_TIME_FORMAT_KEY, DATE_TIME_FORMAT_STR_DEFAULT);
levelInBrackets = getBooleanProperty(SimpleLogger.LEVEL_IN_BRACKETS_KEY, LEVEL_IN_BRACKETS_DEFAULT);
warnLevelString = getStringProperty(SimpleLogger.WARN_LEVEL_STRING_KEY, WARN_LEVELS_STRING_DEFAULT);
logFile = getStringProperty(SimpleLogger.LOG_FILE_KEY, logFile);
cacheOutputStream = getBooleanProperty(SimpleLogger.CACHE_OUTPUT_STREAM_STRING_KEY, CACHE_OUTPUT_STREAM_DEFAULT);
outputChoice = computeOutputChoice(logFile, cacheOutputStream);
String newlineMethodStr = getStringProperty(SimpleLogger.NEWLINE_METHOD_KEY, NEWLINE_METHOD_DEFAULT);
newlineMethod = stringToNewlineMethod(newlineMethodStr);
if (dateTimeFormatStr != null) {
try {
dateFormatter = new SimpleDateFormat(dateTimeFormatStr);
} catch (IllegalArgumentException e) {
Util.report("Bad date format in " + CONFIGURATION_FILE + "; will output relative time", e);
}
}
}
private void loadProperties() {
// Add props from the resource simplelogger.properties
InputStream in = AccessController.doPrivileged(new PrivilegedAction() {
public InputStream run() {
ClassLoader threadCL = Thread.currentThread().getContextClassLoader();
if (threadCL != null) {
return threadCL.getResourceAsStream(CONFIGURATION_FILE);
} else {
return ClassLoader.getSystemResourceAsStream(CONFIGURATION_FILE);
}
}
});
if (null != in) {
try {
properties.load(in);
} catch (java.io.IOException e) {
// ignored
} finally {
try {
in.close();
} catch (java.io.IOException e) {
// ignored
}
}
}
}
String getStringProperty(String name, String defaultValue) {
String prop = getStringProperty(name);
return (prop == null) ? defaultValue : prop;
}
boolean getBooleanProperty(String name, boolean defaultValue) {
String prop = getStringProperty(name);
return (prop == null) ? defaultValue : "true".equalsIgnoreCase(prop);
}
String getStringProperty(String name) {
String prop = null;
String prop2 = null;
try {
prop = System.getProperty(name);
prop2 = (prop != null)?null:((name.indexOf('.') >= 0)?System.getProperty(name.replace(".", "_")):null);
} catch (SecurityException e) {
; // Ignore
}
return (prop == null) ? ((prop2 != null)?prop2:properties.getProperty(name)) : prop;
}
static int stringToLevel(String levelStr) {
if ("trace".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_TRACE;
} else if ("debug".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_DEBUG;
} else if ("info".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_INFO;
} else if ("warn".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_WARN;
} else if ("error".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_ERROR;
} else if ("off".equalsIgnoreCase(levelStr)) {
return SimpleLogger.LOG_LEVEL_OFF;
}
// assume INFO by default
return SimpleLogger.LOG_LEVEL_INFO;
}
static NewlineMethod stringToNewlineMethod(String newlineMethodStr) {
String lowercase = newlineMethodStr.toLowerCase();
switch(lowercase) {
case "none": return NewlineMethod.None;
case "auto": {
String mode = System.getenv("_LAMBDA_TELEMETRY_LOG_FD");
return (mode == null)?NewlineMethod.Manual:NewlineMethod.None;
}
case "manual": return NewlineMethod.Manual;
default : return NewlineMethod.None;
}
}
private static OutputChoice computeOutputChoice(String logFile, boolean cacheOutputStream) {
if ("System.err".equalsIgnoreCase(logFile))
if (cacheOutputStream)
return new OutputChoice(OutputChoiceType.CACHED_SYS_ERR);
else
return new OutputChoice(OutputChoiceType.SYS_ERR);
else if ("System.out".equalsIgnoreCase(logFile)) {
if (cacheOutputStream)
return new OutputChoice(OutputChoiceType.CACHED_SYS_OUT);
else
return new OutputChoice(OutputChoiceType.SYS_OUT);
} else if ("LAMBDA".equalsIgnoreCase(logFile)) {
return new OutputChoice(OutputChoiceType.LAMBDA);
}
else {
try {
FileOutputStream fos = new FileOutputStream(logFile);
PrintStream printStream = new PrintStream(fos);
return new OutputChoice(printStream);
} catch (FileNotFoundException e) {
Util.report("Could not open [" + logFile + "]. Defaulting to System.err", e);
return new OutputChoice(OutputChoiceType.SYS_ERR);
}
}
}
}
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