如何将元数据添加到Node.js grpc调用 [英] How to add metadata to nodejs grpc call

问题描述

我想知道如何将元数据添加到nodejs grpc函数调用中.在与客户建立联系时，我可以使用频道凭据

I'd like to know how to add metadata to a nodejs grpc function call. I can use channel credentials when making the client with

var client = new proto.Document('some.address:8000',
    grpc.credentials.createInsecure()
)

使用client.Send(doc, callback)时发送，但是go grpc服务器在呼叫元数据中查找我必须设置的标识信息.我尝试将grpc.credentials.combineChannelCredentials与不安全的连接和grpc.Metadata实例一起使用，但找不到正确的方法.

Which are send when using client.Send(doc, callback), but the go grpc server looks in the call metadata for identification information which I have to set. I tried using grpc.credentials.combineChannelCredentials with the insecure connection and a grpc.Metadata instance but I can't find the right way to do it.

我遇到的错误是TypeError: compose's first argument must be a CallCredentials object.我试图跟进它，但是它陷入了使我迷失的C代码中，我看不到必须提供comebineChannelCredentials的javascript类型来实现我想要的功能，并且文档在如何实现方面有些稀疏实现这一目标.

The error I run into is TypeError: compose's first argument must be a CallCredentials object. I tried to follow it down but it goes into c code which loses me, I can't see what javascript type I have to give to comebineChannelCredentials to achieve what I'm looking for and the docs are a little sparse on how to achieve this.

推荐答案

您可以将元数据作为可选参数直接传递给方法调用.因此，例如，您可以执行以下操作:

You can pass metadata directly as an optional argument to a method call. So, for example, you could do this:

var meta = new grpc.Metadata();
meta.add('key', 'value');
client.send(doc, meta, callback);

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