问题
In my application I implemented Retrofit to call WebServices and I'm using OkHttp to use Interceptor and Authenticator. Some requests need token, and I have implemented Authenticator interface to handle the refresh (following the official documentation). But I have the following issue : time to time in my app I have to call more than one request at once. Because of that, for one of them I will have the 401 error.
Here is my code for request calls :
public static <S> S createServiceAuthentication(Class<S> serviceClass, boolean hasPagination) {
final String jwt = JWT.getJWTValue(); //Get jwt value from Realm
if (hasPagination) {
Gson gson = new GsonBuilder().
registerTypeAdapter(Pagination.class, new PaginationTypeAdapter()).create();
builder =
new Retrofit.Builder()
.baseUrl(APIConstant.API_URL)
.addConverterFactory(GsonConverterFactory.create(gson));
}
OkHttpClient.Builder httpClient =
new OkHttpClient.Builder();
httpClient.addInterceptor(new AuthenticationInterceptor(jwt));
httpClient.authenticator(new Authenticator() {
@Override
public Request authenticate(Route route, Response response) throws IOException {
if (responseCount(response) >= 2) {
// If both the original call and the call with refreshed token failed,
// it will probably keep failing, so don't try again.
return null;
}
if (jwt.equals(response.request().header("Authorization"))) {
return null; // If we already failed with these credentials, don't retry.
}
APIRest apiRest = createService(APIRest.class, false);
Call<JWTResponse> call = apiRest.refreshToken(new JWTBody(jwt));
try {
retrofit2.Response<JWTResponse> refreshTokenResponse = call.execute();
if (refreshTokenResponse.isSuccessful()) {
JWT.storeJwt(refreshTokenResponse.body().getJwt());
return response.request().newBuilder()
.header(CONTENT_TYPE, APPLICATION_JSON)
.header(ACCEPT, APPLICATION)
.header(AUTHORIZATION, "Bearer " + refreshTokenResponse.body().getJwt())
.build();
} else {
return null;
}
} catch (IOException e) {
return null;
}
}
});
builder.client(httpClient.build());
retrofit = builder.build();
return retrofit.create(serviceClass);
}
private static int responseCount(Response response) {
int result = 1;
while ((response = response.priorResponse()) != null) {
result++;
}
return result;
}
The issue is simple, the first request will refresh the token successfully but others will failed because they will try to refresh a token already refreshed. The WebService return an error 500. Is there any elegant solution to avoid this ?
Thank you !
回答1:
If I understand your issue, some requests are sent while the token is being updated, this gives you an error.
You could try to prevent all the requests while a token is being updated (with a 'synchronized' object) but this will not cover the case of an already sent request.
Since the issue is difficult to avoid completely, maybe the right approach here is to have a good fallback behavior. Handling the error you get when you've made a request during a token update by re-running the request with the updated token for instance.
回答2:
Write Service.
public class TokenService extends Service {
private static final String TAG = "HelloService";
private boolean isRunning = false;
OkHttpClient client;
JSONObject jsonObject;
public static String URL_LOGIN = "http://server.yoursite";
String phone_number, password;
@Override
public void onCreate() {
Log.i(TAG, "Service onCreate");
jsonObject = new JSONObject();
client = new OkHttpClient();
SharedPreferences pref_phone = getSharedPreferences("Full_Phone", MODE_PRIVATE);
phone_number = pref_phone.getString("Phone", "");
SharedPreferences pref_password = getSharedPreferences("User_Password", MODE_PRIVATE);
password = pref_password.getString("Password", "");
isRunning = true;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i(TAG, "Service onStartCommand");
try {
jsonObject.put("phone_number", phone_number);
jsonObject.put("password", password);
} catch (JSONException e) {
e.printStackTrace();
}
new Thread(new Runnable() {
@Override
public void run() {
for (; ; ) {
try {
Thread.sleep(1000 * 60 * 2);
} catch (Exception e) {
}
if (isRunning) {
AsyncTaskRunner myTask = new AsyncTaskRunner();
myTask.execute();
} else {
Log.d("CHECK__", "Check internet connection");
}
}
}
}).start();
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent arg0) {
Log.i(TAG, "Service onBind");
return null;
}
@Override
public void onDestroy() {
isRunning = false;
Log.i(TAG, "Service onDestroy");
}
String post(String url, JSONObject login) {
try {
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, login.toString());
okhttp3.Request request = new okhttp3.Request.Builder()
.url(url)
.post(body)
.build();
okhttp3.Response response = client.newCall(request).execute();
try {
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return "";
}
String response;
private class AsyncTaskRunner extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
}
@Override
protected String doInBackground(String... params) {
try {
response = post(
URL_LOGIN, jsonObject);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
Log.d("---OKHTTP---", response);
}
}
}
来源：https://stackoverflow.com/questions/44386722/okhttp-and-retrofit-refresh-token-with-concurrent-requests