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Logger.java
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/**
* Copyright 2012-2021 The Feign Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package feign;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.logging.FileHandler;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
import static feign.Util.*;
/**
* Simple logging abstraction for debug messages. Adapted from {@code retrofit.RestAdapter.Log}.
*/
public abstract class Logger {
protected static String methodTag(String configKey) {
return '[' + configKey.substring(0, configKey.indexOf('(')) + "] ";
}
/**
* Override to log requests and responses using your own implementation. Messages will be http
* request and response text.
*
* @param configKey value of {@link Feign#configKey(Class, java.lang.reflect.Method)}
* @param format {@link java.util.Formatter format string}
* @param args arguments applied to {@code format}
*/
protected abstract void log(String configKey, String format, Object... args);
/**
* Override to filter out request headers.
*
* @param header header name
* @return true to log a request header
*/
protected boolean shouldLogRequestHeader(String header) {
return true;
}
/**
* Override to filter out response headers.
*
* @param header header name
* @return true to log a response header
*/
protected boolean shouldLogResponseHeader(String header) {
return true;
}
protected void logRequest(String configKey, Level logLevel, Request request) {
log(configKey, "---> %s %s HTTP/1.1", request.httpMethod().name(), request.url());
if (logLevel.ordinal() >= Level.HEADERS.ordinal()) {
for (String field : request.headers().keySet()) {
if (shouldLogRequestHeader(field)) {
for (String value : valuesOrEmpty(request.headers(), field)) {
log(configKey, "%s: %s", field, value);
}
}
}
int bodyLength = 0;
if (request.body() != null) {
bodyLength = request.length();
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
String bodyText =
request.charset() != null
? new String(request.body(), request.charset())
: null;
log(configKey, ""); // CRLF
log(configKey, "%s", bodyText != null ? bodyText : "Binary data");
}
}
log(configKey, "---> END HTTP (%s-byte body)", bodyLength);
}
}
protected void logRetry(String configKey, Level logLevel) {
log(configKey, "---> RETRYING");
}
protected Response logAndRebufferResponse(String configKey,
Level logLevel,
Response response,
long elapsedTime)
throws IOException {
String reason =
response.reason() != null && logLevel.compareTo(Level.NONE) > 0 ? " " + response.reason()
: "";
int status = response.status();
log(configKey, "<--- HTTP/1.1 %s%s (%sms)", status, reason, elapsedTime);
if (logLevel.ordinal() >= Level.HEADERS.ordinal()) {
for (String field : response.headers().keySet()) {
if (shouldLogResponseHeader(field)) {
for (String value : valuesOrEmpty(response.headers(), field)) {
log(configKey, "%s: %s", field, value);
}
}
}
int bodyLength = 0;
if (response.body() != null && !(status == 204 || status == 205)) {
// HTTP 204 No Content "...response MUST NOT include a message-body"
// HTTP 205 Reset Content "...response MUST NOT include an entity"
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
log(configKey, ""); // CRLF
}
byte[] bodyData = Util.toByteArray(response.body().asInputStream());
bodyLength = bodyData.length;
if (logLevel.ordinal() >= Level.FULL.ordinal() && bodyLength > 0) {
log(configKey, "%s", decodeOrDefault(bodyData, UTF_8, "Binary data"));
}
log(configKey, "<--- END HTTP (%s-byte body)", bodyLength);
return response.toBuilder().body(bodyData).build();
} else {
log(configKey, "<--- END HTTP (%s-byte body)", bodyLength);
}
}
return response;
}
protected IOException logIOException(String configKey,
Level logLevel,
IOException ioe,
long elapsedTime) {
log(configKey, "<--- ERROR %s: %s (%sms)", ioe.getClass().getSimpleName(), ioe.getMessage(),
elapsedTime);
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
StringWriter sw = new StringWriter();
ioe.printStackTrace(new PrintWriter(sw));
log(configKey, "%s", sw.toString());
log(configKey, "<--- END ERROR");
}
return ioe;
}
/**
* Controls the level of logging.
*/
public enum Level {
/**
* No logging.
*/
NONE,
/**
* Log only the request method and URL and the response status code and execution time.
*/
BASIC,
/**
* Log the basic information along with request and response headers.
*/
HEADERS,
/**
* Log the headers, body, and metadata for both requests and responses.
*/
FULL
}
/**
* Logs to System.err.
*/
public static class ErrorLogger extends Logger {
@Override
protected void log(String configKey, String format, Object... args) {
System.err.printf(methodTag(configKey) + format + "%n", args);
}
}
/**
* Logs to the category {@link Logger} at {@link java.util.logging.Level#FINE}, if loggable.
*/
public static class JavaLogger extends Logger {
final java.util.logging.Logger logger;
/**
* @deprecated Use {@link #JavaLogger(String)} or {@link #JavaLogger(Class)} instead.
*
* This constructor can be used to create just one logger. Example =
* {@code Logger.JavaLogger().appendToFile("logs/first.log")}
*
* If you create multiple loggers for multiple clients and provide different files
* to write log - you'll have unexpected behavior - all clients will write same log
* to each file.
*
* That's why this constructor will be removed in future.
*/
@Deprecated
public JavaLogger() {
logger = java.util.logging.Logger.getLogger(Logger.class.getName());
}
/**
* Constructor for JavaLogger class
*
* @param loggerName a name for the logger. This should be a dot-separated name and should
* normally be based on the package name or class name of the subsystem, such as java.net
* or javax.swing
*/
public JavaLogger(String loggerName) {
logger = java.util.logging.Logger.getLogger(loggerName);
}
/**
* Constructor for JavaLogger class
*
* @param clazz the returned logger will be named after clazz
*/
public JavaLogger(Class<?> clazz) {
logger = java.util.logging.Logger.getLogger(clazz.getName());
}
@Override
protected void logRequest(String configKey, Level logLevel, Request request) {
if (logger.isLoggable(java.util.logging.Level.FINE)) {
super.logRequest(configKey, logLevel, request);
}
}
@Override
protected Response logAndRebufferResponse(String configKey,
Level logLevel,
Response response,
long elapsedTime)
throws IOException {
if (logger.isLoggable(java.util.logging.Level.FINE)) {
return super.logAndRebufferResponse(configKey, logLevel, response, elapsedTime);
}
return response;
}
@Override
protected void log(String configKey, String format, Object... args) {
if (logger.isLoggable(java.util.logging.Level.FINE)) {
logger.fine(String.format(methodTag(configKey) + format, args));
}
}
/**
* Helper that configures java.util.logging to sanely log messages at FINE level without
* additional formatting.
*/
public JavaLogger appendToFile(String logfile) {
logger.setLevel(java.util.logging.Level.FINE);
try {
FileHandler handler = new FileHandler(logfile, true);
handler.setFormatter(new SimpleFormatter() {
@Override
public String format(LogRecord record) {
return String.format("%s%n", record.getMessage()); // NOPMD
}
});
logger.addHandler(handler);
} catch (IOException e) {
throw new IllegalStateException("Could not add file handler.", e);
}
return this;
}
}
public static class NoOpLogger extends Logger {
@Override
protected void logRequest(String configKey, Level logLevel, Request request) {}
@Override
protected Response logAndRebufferResponse(String configKey,
Level logLevel,
Response response,
long elapsedTime)
throws IOException {
return response;
}
@Override
protected void log(String configKey, String format, Object... args) {}
}
}