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Logger.java
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/*
* Copyright 2013 Netflix, Inc.
*
* 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.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;
import java.util.logging.FileHandler;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
import static feign.Util.UTF_8;
import static feign.Util.ensureClosed;
import static feign.Util.valuesOrEmpty;
/**
* Simple logging abstraction for debug messages. Adapted from {@code retrofit.RestAdapter.Log}.
*/
public abstract class Logger {
/**
* 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 the category {@link Logger} at {@link java.util.logging.Level#FINE}.
*/
public static class ErrorLogger extends Logger {
final java.util.logging.Logger logger = java.util.logging.Logger.getLogger(Logger.class.getName());
@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 = java.util.logging.Logger.getLogger(Logger.class.getName());
@Override void logRequest(String configKey, Level logLevel, Request request) {
if (logger.isLoggable(java.util.logging.Level.FINE)) {
super.logRequest(configKey, logLevel, request);
}
}
@Override
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) {
logger.fine(String.format(methodTag(configKey) + format, args));
}
/**
* helper that configures jul 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 void logRequest(String configKey, Level logLevel, Request request) {
}
@Override
Response logAndRebufferResponse(String configKey, Level logLevel, Response response, long elapsedTime) throws IOException {
return response;
}
@Override
protected void log(String configKey, String format, Object... args) {
}
}
/**
* 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(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);
void logRequest(String configKey, Level logLevel, Request request) {
log(configKey, "---> %s %s HTTP/1.1", request.method(), request.url());
if (logLevel.ordinal() >= Level.HEADERS.ordinal()) {
for (String field : request.headers().keySet()) {
for (String value : valuesOrEmpty(request.headers(), field)) {
log(configKey, "%s: %s", field, value);
}
}
int bytes = 0;
if (request.body() != null) {
bytes = request.body().getBytes(UTF_8).length;
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
log(configKey, ""); // CRLF
log(configKey, "%s", request.body());
}
}
log(configKey, "---> END HTTP (%s-byte body)", bytes);
}
}
void logRetry(String configKey, Level logLevel) {
log(configKey, "---> RETRYING");
}
Response logAndRebufferResponse(String configKey, Level logLevel, Response response, long elapsedTime) throws IOException {
log(configKey, "<--- HTTP/1.1 %s %s (%sms)", response.status(), response.reason(), elapsedTime);
if (logLevel.ordinal() >= Level.HEADERS.ordinal()) {
for (String field : response.headers().keySet()) {
for (String value : valuesOrEmpty(response.headers(), field)) {
log(configKey, "%s: %s", field, value);
}
}
if (response.body() != null) {
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
log(configKey, ""); // CRLF
}
BufferedReader reader = new BufferedReader(response.body().asReader());
try {
StringBuilder buffered = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
buffered.append(line);
if (logLevel.ordinal() >= Level.FULL.ordinal()) {
log(configKey, "%s", line);
}
}
String bodyAsString = buffered.toString();
log(configKey, "<--- END HTTP (%s-byte body)", bodyAsString.getBytes(UTF_8).length);
return Response.create(response.status(), response.reason(), response.headers(), bodyAsString);
} finally {
ensureClosed(reader);
}
}
}
return response;
}
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, sw.toString());
log(configKey, "<--- END ERROR");
}
return ioe;
}
static String methodTag(String configKey) {
return new StringBuilder().append('[').append(configKey.substring(0, configKey.indexOf('('))).append("] ").toString();
}
}