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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.Reader;
import java.text.SimpleDateFormat;
import java.util.logging.FileHandler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;
import static feign.Util.valuesOrEmpty;
/* Writes http headers and body. Plumb to your favorite log impl. */
public abstract class Wire {
/* logs to the category {@link Wire} at {@link Level#FINE}. */
public static class ErrorWire extends Wire {
final Logger logger = Logger.getLogger(Wire.class.getName());
@Override protected void log(Target<?> target, String format, Object... args) {
System.err.printf(format + "%n", args);
}
}
/* logs to the category {@link Wire} at {@link Level#FINE}, if loggable. */
public static class LoggingWire extends Wire {
final Logger logger = Logger.getLogger(Wire.class.getName());
@Override void wireRequest(Target<?> target, Request request) {
if (logger.isLoggable(Level.FINE)) {
super.wireRequest(target, request);
}
}
@Override Response wireAndRebufferResponse(Target<?> target, Response response) throws IOException {
if (logger.isLoggable(Level.FINE)) {
return super.wireAndRebufferResponse(target, response);
}
return response;
}
@Override protected void log(Target<?> target, String format, Object... args) {
logger.fine(String.format(format, args));
}
/* helper that configures jul to sanely log messages. */
public LoggingWire appendToFile(String logfile) {
final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
logger.setLevel(Level.FINE);
try {
FileHandler handler = new FileHandler(logfile, true);
handler.setFormatter(new SimpleFormatter() {
@Override
public String format(LogRecord record) {
String timestamp = sdf.format(new java.util.Date(record.getMillis())); // NOPMD
return String.format("%s %s%n", timestamp, record.getMessage()); // NOPMD
}
});
logger.addHandler(handler);
} catch (IOException e) {
throw new IllegalStateException("Could not add file handler.", e);
}
return this;
}
}
public static class NoOpWire extends Wire {
@Override void wireRequest(Target<?> target, Request request) {
}
@Override Response wireAndRebufferResponse(Target<?> target, Response response) throws IOException {
return response;
}
@Override
protected void log(Target<?> target, String format, Object... args) {
}
}
/**
* Override to log requests and responses using your own implementation.
* Messages will be http request and response text.
*
* @param target useful if using MDC (Mapped Diagnostic Context) loggers
* @param format {@link java.util.Formatter format string}
* @param args arguments applied to {@code format}
*/
protected abstract void log(Target<?> target, String format, Object... args);
void wireRequest(Target<?> target, Request request) {
log(target, ">> %s %s HTTP/1.1", request.method(), request.url());
for (String field : request.headers().keySet()) {
for (String value : valuesOrEmpty(request.headers(), field)) {
log(target, ">> %s: %s", field, value);
}
}
if (request.body() != null) {
log(target, ">> "); // CRLF
log(target, ">> %s", request.body());
}
}
Response wireAndRebufferResponse(Target<?> target, Response response) throws IOException {
log(target, "<< HTTP/1.1 %s %s", response.status(), response.reason());
for (String field : response.headers().keySet()) {
for (String value : valuesOrEmpty(response.headers(), field)) {
log(target, "<< %s: %s", field, value);
}
}
if (response.body() != null) {
log(target, "<< "); // CRLF
Reader body = response.body().asReader();
try {
StringBuilder buffered = new StringBuilder();
BufferedReader reader = new BufferedReader(body);
String line;
while ((line = reader.readLine()) != null) {
buffered.append(line);
log(target, "<< %s", line);
}
return Response.create(response.status(), response.reason(), response.headers(), buffered.toString());
} finally {
try {
body.close();
} catch (IOException suppressed) { // NOPMD
}
}
}
return response;
}
}