我创建了一个非常简单的书店，其中包含书籍、客户和主要服务。这个特殊的问题涉及到 main 和 books 服务。
我目前正在发出一个名为“createBook”的 gRPC 请求，它会在我们的数据库中创建一本书，以及控制台日志。
在没有 docker 的情况下运行 gRPC 服务器（booksServer）时，该过程运行顺利。
但是一旦我使用 docker，gRPC 请求似乎没有进入 gRPC 服务器......
“使用 docker”是指使用 docker 来运行 booksServer。（如下所示）
结果：没有 Docker
As you can see, without docker, the request is fulfilled, and everything works as it should.
Our gRPC client makes a call to the gRPC server (in which metadata is created) and the metadata is also sent back to the client.
(Scroll down to see the gRPC server file with the method called "getBooks".)
图书服务器（没有 docker）
*** Notice the console logs in the booksServer!!! ***
让我运行 booksServer（使用 docker）
（下面的Dockerfile）
FROM node:12.14.0
WORKDIR /usr/src/app
COPY package*.json ./
COPY . /usr/src/app
RUN npm install
RUN npm install nodemon -g
EXPOSE 30043
CMD ["nodemon", "booksServer.js"
Here's my main service docker file too which initiates the request:
FROM node:12.14.0
WORKDIR /usr/src/app
COPY package*.json ./
COPY . /usr/src/app
# COPY wait-for-it.sh .
# RUN chmod +x /wait-for-it.sh
RUN npm install
EXPOSE 4555
CMD ["node", "main.js"]
^^^ Notice how when dockerfile is used to run booksServer
it doesn't go/run inside the booksServer file
***It does NOT produce any console.logs when I fire off a gRPC requesst***
这就是 booksServer.js 文件的样子
这是书根
//use this for bookInitiator
const path = require('path');
const PROTO_PATH = path.join(__dirname, "../protos/books.proto");
const grpc = require("grpc");
const protoLoader = require("@grpc/proto-loader");
const packageDefinition = protoLoader.loadSync(PROTO_PATH, {
keepCase: true,
longs: String,
enums: String,
arrays: true
});
const BooksService = grpc.loadPackageDefinition(packageDefinition).BooksService;
// potential issues to fix 1) making localhost port dynamic 2) docker containerization may cause conflict
const client = new BooksService (
"172.17.0.2:30043",
grpc.credentials.createInsecure()
);
console.log("Creating stub inside booksStub");
module.exports = client;
这是 gRPC 服务器文件（带有绑定的端口）。
// const PROTO_PATH = "../protos/books.proto";
const path = require('path');
const PROTO_PATH = path.join(__dirname, './protos/books.proto');
const grpc = require("grpc");
const protoLoader = require("@grpc/proto-loader");
const express = require("express");
const controller = require("./booksController.js");
const app = express();
app.use(express.json());
const packageDefinition = protoLoader.loadSync(PROTO_PATH, {
keepCase: true,
longs: String,
enums: String,
arrays: true,
});
const booksProto = grpc.loadPackageDefinition(packageDefinition);
const { v4: uuidv4 } = require("uuid");
const server = new grpc.Server();
server.addService(booksProto.BooksService.service, {
CreateBook: (call, callback) => {
console.log("call to CreateBook");
//sample will take the call information from the client(stub)
const book = {
title: call.request.title,
author: call.request.author,
numberOfPages: call.request.numberOfPages,
publisher: call.request.publisher,
id: call.request.id,
};
controller.createBook(book);
let meta = new grpc.Metadata();
meta.add("response", "none");
console.log("metadata in createBook...: ", meta);
call.sendMetadata(meta);
callback(
null,
//bookmodel.create
{
title: `completed for: ${call.request.title}`,
author: `completed for: ${call.request.author}`,
numberOfPages: `completed for: ${call.request.numberOfPages}`,
publisher: `completed for: ${call.request.publisher}`,
id: `completed for: ${call.request.id}`,
}
);
},
GetBooks: (call, callback) => {
console.log("call to GetBooks");
// read from database
let meta = new grpc.Metadata();
meta.add('response', 'none');
call.sendMetadata(meta);
controller.getBooks(callback);
}
});
server.bind("0.0.0.0:30043", grpc.ServerCredentials.createInsecure());
console.log("booksServer.js running at 0.0.0.0:30043");
console.log("Inside Books Server!");
console.log("call from books server");
server.start();
horus.js（定制的简单追踪工具），抓取追踪抓取某个请求的旅程并将其作为元数据发送回 gRPC 客户端
const fs = require("fs");
const grpc = require("grpc");
const path = require("path");
class horus {
constructor(name) {
this.serviceName = name; // represents the name of the microservices
this.startTime = null;
this.endTime = null;
this.request = {};
this.targetService = null; // represents the location to which the request was made
this.allRequests = []; // array which stores all requests
this.timeCompleted = null;
this.call;
}
static getReqId() {
// primitive value - number of millisecond since midnight January 1, 1970 UTC
// add service name/ initials to the beginning of reqId?
return new Date().valueOf();
}
// start should be invoked before the request is made
// start begins the timer and initializes the request as pending
start(targetService, call) {
this.startTime = Number(process.hrtime.bigint());
this.request[targetService] = "pending"; // {books: 'pending', responseTime: 'pending'}
this.request.responseTime = "pending";
this.targetService = targetService;
this.call = call;
this.request.requestId = horus.getReqId();
}
// end should be invoked when the request has returned
end() {
this.endTime = Number(process.hrtime.bigint());
this.request.responseTime = (
(this.endTime - this.startTime) /
1000000
).toFixed(3); //converting into ms.
this.sendResponse();
this.request.timeCompleted = this.getCurrentTime();
}
// grabTrace accepts inserts trace into request
// trace represents the "journey" of the request
// trace expects metaData to be 'none when the server made no additional requests
// trace expects metaData to be the request object generated by the server otherwise
// in gRPC, the trace must be sent back as meta data. objects should be converted with JSON.parse
grabTrace(metaData) {
//console.log("incoming meta data ", metaData);
console.log("Inside Grab Trace Method.");
console.log("Metadata inside grabTrace: ", metaData);
if (metaData === "none" || metaData === undefined) this.request[this.targetService] = "none";
else {
metaData = JSON.parse(metaData);
this.request[this.targetService] = metaData;
}
this.allRequests.push(this.request);
this.sendResponse();
}
// displayRequests logs to the console all stored requests
// setTimeout builds in deliberate latency since metadata may be sent before or after a request is done processing
displayRequests() {
console.log("\n\n");
console.log("Logging all requests from : ", this.serviceName);
this.allRequests.forEach((request) => {
console.log("\n");
console.log(request);
});
console.log("\n\n");
}
// sends response via metadata if service is in the middle of a chain
sendResponse() {
if (
this.request.responseTime === "pending" ||
this.request[this.targetService] === "pending" ||
this.call === undefined
)
return;
console.log("Inside send response");
let meta = new grpc.Metadata();
meta.add("response", JSON.stringify(this.request));
console.log('meta in send response: ', meta)
this.call.sendMetadata(meta);
}
writeToFile() {
console.log("call to writeToFile");
console.log("logging request obj ", this.request);
let strRequests = "";
for (let req of this.allRequests) {
// First write to file - contains Total
// subsequent - chained requests
strRequests += `Request ID: ${req.requestId}\n`;
strRequests += `"${
Object.keys(req)[0]
}" service -> Response received in ${Object.values(req)[1]} ms (Total)\n`;
strRequests += `Timestamp: ${req.timeCompleted}\n`;
// while we don't hit an empty object on the 1st key, go inside
// add numbering in order for nested requests inside original?!
let innerObj = Object.values(req)[0];
while (innerObj !== "none") {
strRequests += `"${
Object.keys(innerObj)[0]
}" service -> Response received in ${Object.values(innerObj)[1]} ms\n`;
strRequests += `Timestamp: ${innerObj.timeCompleted}\n`;
innerObj = Object.values(innerObj)[0];
}
strRequests +=
"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
}
console.log('strRequests', strRequests)
fs.writeFile(this.serviceName + 'data' + '.txt', strRequests, { flag: "a+" }, (err) => {
if (err) {
console.error(err);
}
}); //'a+' is append mode
}
module.exports = horus;
main.js（发起 gRPC 客户端请求）
const path = require('path');
// const grpc = require("grpc");
const customersStub = require("./stubs/customersStub.js");
const booksStub = require("./stubs/booksStub.js");
const horusTracer = require(path.join(__dirname, "./horus/horus.js"));
//In master branch
console.log("Stub is Inside main service!!!");
const book = {
title: "ITttttt",
author: "Stephen King",
numberOfPages: 666,
publisher: "Random House",
id: 200,
};
const bookId = {
id: 200
}
const customer = {
id: 123,
name: "Lily",
age: 23,
address: "Blablabla",
favBookId: 100
};
const customerId = {
id: 123
}
let ht = new horusTracer("main");
function CreateBook () {
ht.start('books')
booksStub.CreateBook(book, (error, response) => {
if (error) console.log("there was an error ", error);
ht.end();
ht.displayRequests();
ht.writeToFile();
}).on('metadata', (metadata) => {
console.log("Before grab trace is invoked!");
ht.grabTrace(metadata.get('response')[0]);
});
}
}
CreateBook(); //Works
我认为是什么问题。
Edit: murgatroid99 mentioned that it was a networking issue with docker!
~~~~~~~~~
I initially thought this was a networking issue, but I don't think it is
because all my docker files are running on the default bridge network.
So they all technically can communicate with one another...
Is it something wrong with nodemon interacting with Docker?
Does the server not output the console logs...?
Is the server actually running and working...?
Do I need a reverse proxy like nginx?
``