/**
* Peeks up to {@code byteCount} bytes from the response body and returns them as a new response
* body. If fewer than {@code byteCount} bytes are in the response body, the full response body is
* returned. If more than {@code byteCount} bytes are in the response body, the returned value
* will be truncated to {@code byteCount} bytes.
*
* <p>It is an error to call this method after the body has been consumed.
*
* <p><strong>Warning:</strong> this method loads the requested bytes into memory. Most
* applications should set a modest limit on {@code byteCount}, such as 1 MiB.
*/
public ResponseBody peekBody(long byteCount) throws IOException {
BufferedSource source = body.source();
source.request(byteCount);
Buffer copy = source.buffer().clone();
// There may be more than byteCount bytes in source.buffer(). If there is, return a prefix.
Buffer result;
if (copy.size() > byteCount) {
result = new Buffer();
result.write(copy, byteCount);
copy.clear();
} else {
result = copy;
}
return ResponseBody.create(body.contentType(), result.size(), result);
}
@Override
public Response intercept(Chain chain) throws IOException {
Level level = this.level;
Request request = chain.request();
if (level == Level.NONE) {
return chain.proceed(request);
}
boolean logBody = level == Level.BODY;
boolean logHeaders = logBody || level == Level.HEADERS;
RequestBody requestBody = request.body();
boolean hasRequestBody = requestBody != null;
Connection connection = chain.connection();
Protocol protocol = connection != null ? connection.getProtocol() : Protocol.HTTP_1_1;
String requestStartMessage =
"--> " + request.method() + ' ' + requestPath(request.httpUrl()) + ' ' + protocol(protocol);
if (!logHeaders && hasRequestBody) {
requestStartMessage += " (" + requestBody.contentLength() + "-byte body)";
}
logger.log(requestStartMessage);
if (logHeaders) {
Headers headers = request.headers();
for (int i = 0, count = headers.size(); i < count; i++) {
logger.log(headers.name(i) + ": " + headers.value(i));
}
String endMessage = "--> END " + request.method();
if (logBody && hasRequestBody) {
Buffer buffer = new Buffer();
requestBody.writeTo(buffer);
Charset charset = UTF8;
MediaType contentType = requestBody.contentType();
if (contentType != null) {
contentType.charset(UTF8);
}
logger.log("");
logger.log(buffer.readString(charset));
endMessage += " (" + requestBody.contentLength() + "-byte body)";
}
logger.log(endMessage);
}
long startNs = System.nanoTime();
Response response = chain.proceed(request);
long tookMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs);
ResponseBody responseBody = response.body();
logger.log(
"<-- "
+ protocol(response.protocol())
+ ' '
+ response.code()
+ ' '
+ response.message()
+ " ("
+ tookMs
+ "ms"
+ (!logHeaders ? ", " + responseBody.contentLength() + "-byte body" : "")
+ ')');
if (logHeaders) {
Headers headers = response.headers();
for (int i = 0, count = headers.size(); i < count; i++) {
logger.log(headers.name(i) + ": " + headers.value(i));
}
String endMessage = "<-- END HTTP";
if (logBody) {
BufferedSource source = responseBody.source();
source.request(Long.MAX_VALUE); // Buffer the entire body.
Buffer buffer = source.buffer();
Charset charset = UTF8;
MediaType contentType = responseBody.contentType();
if (contentType != null) {
charset = contentType.charset(UTF8);
}
if (responseBody.contentLength() != 0) {
logger.log("");
logger.log(buffer.clone().readString(charset));
}
endMessage += " (" + buffer.size() + "-byte body)";
}
logger.log(endMessage);
}
return response;
}