如何将数据从gRPC拦截器传递到服务方法调用? [英] How to pass data from gRPC interceptor to service method call?

问题描述

我需要从我的ServerAuthIntereptor中传递一些数据以进行呼叫.

I need to pass some data from my ServerAuthIntereptor to call.

ServerAuthInterceptor:

ServerAuthInterceptor:

// used in context parameters map
private static final String AUTH_CONTEXT = "authContext";
private static final Context.Key<Object> AUTH_CONTEXT_KEY = Context.key(AUTH_CONTEXT);

// ...

@Override
public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
    ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {

    // check credentials from header

    // remember account and session token for usage later (eg. in logout)
    AuthContext authContext = new AuthContext();
    authContext.account = account;
    authContext.sessionToken = sessionToken;

    logger.info("Call {} allowed (account={}, authContext={})",
        new Object[] { call, account, authContext });

    Context context = Context
        .current()
        .withValue(AUTH_CONTEXT_KEY, authContext);

    return Contexts.interceptCall(context, call, headers, next);
}

// ...

/**
 * To be used from services
 * @return
 */
public static Account getCurrentContextAccount() {
    AuthContext authContext = (AuthContext) Context.current().key(AUTH_CONTEXT).get();
    return authContext.account;
}

在某些服务方法实现中，我尝试从当前上下文访问存储的"authContext":

In some service method implementation i try to access that stored 'authContext' from current context:

@Override
public void list(ListRequest request, StreamObserver<ListResponse> responseObserver) {
    logger.info("Starting list({}) ...", request);

     // ...

     account = ServerAuthInterceptor.getCurrentContextAccount();

但是authContext是null. 有时它可以工作，所以我相信它与线程(本地)有关.

But authContext is null. It's working sometimes so i believe it's related to threads(locals).

做这件事的正确方法是什么?

What is proper way to do it?

推荐答案

由于某些原因，它不适用于AuthContext类，但是如果我分别传递2个上下文值，则它可以工作:

For some reason it does not work fot AuthContext class, but it works if i pass 2 context values separately:

ServerAuthInterceptor:

ServerAuthInterceptor:

Context context = Context
        .current()
        .withValue(AUTH_TOKEN_KEY, sessionToken)
        .withValue(AUTH_ACCOUNT_KEY, account);

服务电话:

/**
 * To be used from services
 * @return
 */
public static Account getCurrentContextAccount() {
    return (Account) AUTH_ACCOUNT_KEY.get();
}

/**
 * To be used from services
 * @return
 */
public static String getCurrentContextSessionToken() {
    return (String) AUTH_TOKEN_KEY.get();
}

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