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/**
* Copyright 2012-2019 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 example.github;
import feign.*;
import feign.codec.Decoder;
import feign.codec.Encoder;
import feign.codec.ErrorDecoder;
import feign.gson.GsonDecoder;
import feign.gson.GsonEncoder;
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
/**
* Inspired by {@code com.example.retrofit.GitHubClient}
*/
public class GitHubExample {
private static final String GITHUB_TOKEN = "GITHUB_TOKEN";
interface GitHub {
class Repository {
String name;
}
class Contributor {
String login;
}
class Issue {
Issue() {
}
String title;
String body;
List<String> assignees;
int milestone;
List<String> labels;
}
@RequestLine("GET /users/{username}/repos?sort=full_name")
List<Repository> repos(@Param("username") String owner);
@RequestLine("GET /repos/{owner}/{repo}/contributors")
List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
@RequestLine("POST /repos/{owner}/{repo}/issues")
void createIssue(Issue issue, @Param("owner") String owner, @Param("repo") String repo);
/** Lists all contributors for all repos owned by a user. */
default List<String> contributors(String owner) {
return repos(owner).stream()
.flatMap(repo -> contributors(owner, repo.name).stream())
.map(c -> c.login)
.distinct()
.collect(Collectors.toList());
}
static GitHub connect() {
Decoder decoder = new GsonDecoder();
Encoder encoder = new GsonEncoder();
return Feign.builder()
.encoder(encoder)
.decoder(decoder)
.errorDecoder(new GitHubErrorDecoder(decoder))
.logger(new Logger.ErrorLogger())
.logLevel(Logger.Level.BASIC)
.requestInterceptor(template -> {
if (System.getenv().containsKey(GITHUB_TOKEN)) {
System.out.println("Detected Authorization token from environment variable");
template.header(
"Authorization",
"token " + System.getenv(GITHUB_TOKEN));
}
})
.target(GitHub.class, "https://api.github.com");
}
}
static class GitHubClientError extends RuntimeException {
private String message; // parsed from json
@Override
public String getMessage() {
return message;
}
}
public static void main(String... args) {
GitHub github = GitHub.connect();
System.out.println("Let's fetch and print a list of the contributors to this org.");
List<String> contributors = github.contributors("openfeign");
for (String contributor : contributors) {
System.out.println(contributor);
}
System.out.println("Now, let's cause an error.");
try {
github.contributors("openfeign", "some-unknown-project");
} catch (GitHubClientError e) {
System.out.println(e.getMessage());
}
System.out.println("Now, try to create an issue - which will also cause an error.");
try {
GitHub.Issue issue = new GitHub.Issue();
issue.title = "The title";
issue.body = "Some Text";
github.createIssue(issue, "OpenFeign", "SomeRepo");
} catch (GitHubClientError e) {
System.out.println(e.getMessage());
}
}
static class GitHubErrorDecoder implements ErrorDecoder {
final Decoder decoder;
final ErrorDecoder defaultDecoder = new ErrorDecoder.Default();
GitHubErrorDecoder(Decoder decoder) {
this.decoder = decoder;
}
@Override
public Exception decode(String methodKey, Response response) {
try {
// must replace status by 200 other GSONDecoder returns null
response = response.toBuilder().status(200).build();
return (Exception) decoder.decode(response, GitHubClientError.class);
} catch (IOException fallbackToDefault) {
return defaultDecoder.decode(methodKey, response);
}
}
}
}