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FeignException.java
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/*
* Copyright 2012-2023 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.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static feign.Util.*;
import static java.lang.String.format;
/**
* Origin exception type for all Http Apis.
*/
public class FeignException extends RuntimeException {
private static final String EXCEPTION_MESSAGE_TEMPLATE_NULL_REQUEST =
"request should not be null";
private static final long serialVersionUID = 0;
private final int status;
private byte[] responseBody;
private Map<String, Collection<String>> responseHeaders;
private final Request request;
protected FeignException(int status, String message, Throwable cause) {
super(message, cause);
this.status = status;
this.request = null;
}
protected FeignException(int status, String message, Throwable cause, byte[] responseBody,
Map<String, Collection<String>> responseHeaders) {
super(message, cause);
this.status = status;
this.responseBody = responseBody;
this.responseHeaders = caseInsensitiveCopyOf(responseHeaders);
this.request = null;
}
protected FeignException(int status, String message) {
super(message);
this.status = status;
this.request = null;
}
protected FeignException(int status, String message, byte[] responseBody,
Map<String, Collection<String>> responseHeaders) {
super(message);
this.status = status;
this.responseBody = responseBody;
this.responseHeaders = caseInsensitiveCopyOf(responseHeaders);
this.request = null;
}
protected FeignException(int status, String message, Request request, Throwable cause) {
super(message, cause);
this.status = status;
this.request = checkRequestNotNull(request);
}
protected FeignException(int status, String message, Request request, Throwable cause,
byte[] responseBody, Map<String, Collection<String>> responseHeaders) {
super(message, cause);
this.status = status;
this.responseBody = responseBody;
this.responseHeaders = caseInsensitiveCopyOf(responseHeaders);
this.request = checkRequestNotNull(request);
}
protected FeignException(int status, String message, Request request) {
super(message);
this.status = status;
this.request = checkRequestNotNull(request);
}
protected FeignException(int status, String message, Request request, byte[] responseBody,
Map<String, Collection<String>> responseHeaders) {
super(message);
this.status = status;
this.responseBody = responseBody;
this.responseHeaders = caseInsensitiveCopyOf(responseHeaders);
this.request = checkRequestNotNull(request);
}
private Request checkRequestNotNull(Request request) {
return checkNotNull(request, EXCEPTION_MESSAGE_TEMPLATE_NULL_REQUEST);
}
public int status() {
return this.status;
}
/**
* The Response Body, if present.
*
* @return the body of the response.
* @deprecated use {@link #responseBody()} instead.
*/
@Deprecated
public byte[] content() {
return this.responseBody;
}
/**
* The Response body.
*
* @return an Optional wrapping the response body.
*/
public Optional<ByteBuffer> responseBody() {
if (this.responseBody == null) {
return Optional.empty();
}
return Optional.of(ByteBuffer.wrap(this.responseBody));
}
public Map<String, Collection<String>> responseHeaders() {
if (this.responseHeaders == null) {
return Collections.emptyMap();
}
return responseHeaders;
}
public Request request() {
return this.request;
}
public boolean hasRequest() {
return (this.request != null);
}
public String contentUTF8() {
if (responseBody != null) {
return new String(responseBody, UTF_8);
} else {
return "";
}
}
static FeignException errorReading(Request request, Response response, IOException cause) {
return new FeignException(
response.status(),
format("%s reading %s %s", cause.getMessage(), request.httpMethod(), request.url()),
request,
cause,
request.body(),
request.headers());
}
public static FeignException errorStatus(String methodKey, Response response) {
return errorStatus(methodKey, response, null, null);
}
public static FeignException errorStatus(String methodKey,
Response response,
Integer maxBodyBytesLength,
Integer maxBodyCharsLength) {
byte[] body = {};
try {
if (response.body() != null) {
body = Util.toByteArray(response.body().asInputStream());
}
} catch (IOException ignored) { // NOPMD
}
String message = new FeignExceptionMessageBuilder()
.withResponse(response)
.withMethodKey(methodKey)
.withMaxBodyBytesLength(maxBodyBytesLength)
.withMaxBodyCharsLength(maxBodyCharsLength)
.withBody(body).build();
return errorStatus(response.status(), message, response.request(), body, response.headers());
}
private static FeignException errorStatus(int status,
String message,
Request request,
byte[] body,
Map<String, Collection<String>> headers) {
if (isClientError(status)) {
return clientErrorStatus(status, message, request, body, headers);
}
if (isServerError(status)) {
return serverErrorStatus(status, message, request, body, headers);
}
return new FeignException(status, message, request, body, headers);
}
private static boolean isClientError(int status) {
return status >= 400 && status < 500;
}
private static FeignClientException clientErrorStatus(int status,
String message,
Request request,
byte[] body,
Map<String, Collection<String>> headers) {
switch (status) {
case 400:
return new BadRequest(message, request, body, headers);
case 401:
return new Unauthorized(message, request, body, headers);
case 403:
return new Forbidden(message, request, body, headers);
case 404:
return new NotFound(message, request, body, headers);
case 405:
return new MethodNotAllowed(message, request, body, headers);
case 406:
return new NotAcceptable(message, request, body, headers);
case 409:
return new Conflict(message, request, body, headers);
case 410:
return new Gone(message, request, body, headers);
case 415:
return new UnsupportedMediaType(message, request, body, headers);
case 429:
return new TooManyRequests(message, request, body, headers);
case 422:
return new UnprocessableEntity(message, request, body, headers);
default:
return new FeignClientException(status, message, request, body, headers);
}
}
private static boolean isServerError(int status) {
return status >= 500 && status <= 599;
}
private static FeignServerException serverErrorStatus(int status,
String message,
Request request,
byte[] body,
Map<String, Collection<String>> headers) {
switch (status) {
case 500:
return new InternalServerError(message, request, body, headers);
case 501:
return new NotImplemented(message, request, body, headers);
case 502:
return new BadGateway(message, request, body, headers);
case 503:
return new ServiceUnavailable(message, request, body, headers);
case 504:
return new GatewayTimeout(message, request, body, headers);
default:
return new FeignServerException(status, message, request, body, headers);
}
}
static FeignException errorExecuting(Request request, IOException cause) {
final Long nonRetryable = null;
return new RetryableException(
-1,
format("%s executing %s %s", cause.getMessage(), request.httpMethod(), request.url()),
request.httpMethod(),
cause,
nonRetryable, request);
}
public static class FeignClientException extends FeignException {
public FeignClientException(int status, String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(status, message, request, body, headers);
}
}
public static class BadRequest extends FeignClientException {
public BadRequest(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(400, message, request, body, headers);
}
}
public static class Unauthorized extends FeignClientException {
public Unauthorized(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(401, message, request, body, headers);
}
}
public static class Forbidden extends FeignClientException {
public Forbidden(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(403, message, request, body, headers);
}
}
public static class NotFound extends FeignClientException {
public NotFound(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(404, message, request, body, headers);
}
}
public static class MethodNotAllowed extends FeignClientException {
public MethodNotAllowed(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(405, message, request, body, headers);
}
}
public static class NotAcceptable extends FeignClientException {
public NotAcceptable(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(406, message, request, body, headers);
}
}
public static class Conflict extends FeignClientException {
public Conflict(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(409, message, request, body, headers);
}
}
public static class Gone extends FeignClientException {
public Gone(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(410, message, request, body, headers);
}
}
public static class UnsupportedMediaType extends FeignClientException {
public UnsupportedMediaType(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(415, message, request, body, headers);
}
}
public static class TooManyRequests extends FeignClientException {
public TooManyRequests(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(429, message, request, body, headers);
}
}
public static class UnprocessableEntity extends FeignClientException {
public UnprocessableEntity(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(422, message, request, body, headers);
}
}
public static class FeignServerException extends FeignException {
public FeignServerException(int status, String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(status, message, request, body, headers);
}
}
public static class InternalServerError extends FeignServerException {
public InternalServerError(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(500, message, request, body, headers);
}
}
public static class NotImplemented extends FeignServerException {
public NotImplemented(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(501, message, request, body, headers);
}
}
public static class BadGateway extends FeignServerException {
public BadGateway(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(502, message, request, body, headers);
}
}
public static class ServiceUnavailable extends FeignServerException {
public ServiceUnavailable(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(503, message, request, body, headers);
}
}
public static class GatewayTimeout extends FeignServerException {
public GatewayTimeout(String message, Request request, byte[] body,
Map<String, Collection<String>> headers) {
super(504, message, request, body, headers);
}
}
private static class FeignExceptionMessageBuilder {
private static final int MAX_BODY_BYTES_LENGTH = 400;
private static final int MAX_BODY_CHARS_LENGTH = 200;
private Response response;
private byte[] body;
private String methodKey;
private Integer maxBodyBytesLength;
private Integer maxBodyCharsLength;
public FeignExceptionMessageBuilder withResponse(Response response) {
this.response = response;
return this;
}
public FeignExceptionMessageBuilder withBody(byte[] body) {
this.body = body;
return this;
}
public FeignExceptionMessageBuilder withMethodKey(String methodKey) {
this.methodKey = methodKey;
return this;
}
public FeignExceptionMessageBuilder withMaxBodyBytesLength(Integer length) {
this.maxBodyBytesLength = length;
return this;
}
public FeignExceptionMessageBuilder withMaxBodyCharsLength(Integer length) {
this.maxBodyCharsLength = length;
return this;
}
public String build() {
StringBuilder result = new StringBuilder();
if (maxBodyBytesLength == null) {
maxBodyBytesLength = MAX_BODY_BYTES_LENGTH;
}
if (maxBodyCharsLength == null) {
maxBodyCharsLength = MAX_BODY_CHARS_LENGTH;
}
if (response.reason() != null) {
result.append(format("[%d %s]", response.status(), response.reason()));
} else {
result.append(format("[%d]", response.status()));
}
result.append(format(" during [%s] to [%s] [%s]", response.request().httpMethod(),
response.request().url(), methodKey));
result.append(format(": [%s]", getBodyAsString(body, response.headers())));
return result.toString();
}
private String getBodyAsString(byte[] body, Map<String, Collection<String>> headers) {
Charset charset = getResponseCharset(headers);
if (charset == null) {
charset = Util.UTF_8;
}
return getResponseBody(body, charset);
}
private String getResponseBody(byte[] body, Charset charset) {
if (body.length < maxBodyBytesLength) {
return new String(body, charset);
}
return getResponseBodyPreview(body, charset);
}
private String getResponseBodyPreview(byte[] body, Charset charset) {
try {
Reader reader = new InputStreamReader(new ByteArrayInputStream(body), charset);
CharBuffer result = CharBuffer.allocate(maxBodyCharsLength);
reader.read(result);
reader.close();
((Buffer) result).flip();
return result + "... (" + body.length + " bytes)";
} catch (IOException e) {
return e + ", failed to parse response";
}
}
private static Charset getResponseCharset(Map<String, Collection<String>> headers) {
Collection<String> strings = headers.get("content-type");
if (strings == null || strings.isEmpty()) {
return null;
}
Pattern pattern = Pattern.compile(".*charset=([^\\s|^;]+).*");
Matcher matcher = pattern.matcher(strings.iterator().next());
if (!matcher.lookingAt()) {
return null;
}
String group = matcher.group(1);
if (!Charset.isSupported(group)) {
return null;
}
return Charset.forName(group);
}
}
}