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index.js
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index.js
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"use strict";
require("colors");
require("events").prototype.inspect = () => {
return "EventEmitter {}";
};
let fs = require("fs");
let net = require("net");
let grpc = require("grpc");
let loader = require("@grpc/proto-loader");
let fmt = require("util").format;
let repl = require("repl");
let inquirer = require("inquirer");
let _eval = require("eval");
let vm = require("vm");
let protobuf = require("protobufjs");
function createUnixSocketProxy(unixAddr, cb) {
let server = net.createServer(conn => {
let unixConn = net.createConnection(unixAddr);
unixConn.on("error", () => {
conn.end();
});
conn.pipe(unixConn);
unixConn.pipe(conn);
conn.unref();
unixConn.unref();
});
server.listen(0, "localhost", () => {
server.unref();
let port = server.address().port;
console.log("Proxying UNIX socket", unixAddr, "via port", port);
cb(null, port);
});
}
function prepareClient(service, args, options) {
if (args.address.startsWith("unix:")) {
createUnixSocketProxy(args.address.substr(5), (err, tcpPort) => {
if (err) return console.error("Unable to prepare proxy:", err);
args.address = "localhost:" + tcpPort;
init(service, args, options);
});
return;
}
init(service, args, options);
}
function createClient(args, options) {
if (!args.address) {
throw new Error("Address should be valid");
}
let file = {
root: args.directory ? args.directory : process.cwd(),
file: args.proto
};
let packageDefinition = loader.loadSync(file.file, {});
let parsed = grpc.loadPackageDefinition(packageDefinition);
// It's possible the proto has no `package defined`
if (foundServiceClient(parsed)) {
parsed = { unknown: parsed };
}
let services = [];
findService(parsed).forEach(def => {
let desc = {};
desc.package = def.package;
desc.name = def.serviceName;
desc.fqn = `${desc.package}.${desc.name}`;
desc.def = def.def;
services.push(desc);
});
if (args.service) {
let matcher = new RegExp(args.service, "i");
services = services.filter(
s => matcher.test(s.name) || matcher.test(s.fqn)
);
}
if (services.length === 0) {
console.error("Unable to find any service in proto file");
} else if (services.length === 1) {
return prepareClient(services[0], args, options);
} else {
inquirer
.prompt([
{
type: "list",
name: "service",
message: "What service would you like to connect to?",
choices: services.map(s => s.fqn)
}
])
.then(function(answers) {
let service = services.find(s => s.fqn === answers.service);
prepareClient(service, args, options);
})
.catch(err => {
console.error(err);
});
}
}
// Only check top-level properties for a service
function foundServiceClient(obj) {
return Object.keys(obj).some(key => obj[key].service) > 0;
}
// Recursively search a parsed protos definition for the first service
function findService(def, n) {
let keys = Object.keys(def);
let found = [];
let m = n || 0;
if (m > 5) return [];
for (let i = 0; i < keys.length; i++) {
let propName = keys[i];
let propValue = def[propName];
if (typeof propValue === "object") {
findService(propValue, m++).forEach(res => {
res.package = `${propName}${res.package ? "." + res.package : ""}`;
found.push(res);
});
} else if (propValue.service) {
found.push({ serviceName: propName, def: propValue });
}
}
return found;
}
function init(service, args, options) {
let address = args.address;
let ev = loadEval(args);
let creds = createCredentials(options);
let client = new service.def(address, creds);
function loadVars(table, displayPrompt, newLine) {
table.grpc = grpc;
table.client = client;
table.printReply = printReply.bind(null, displayPrompt, newLine);
table.pr = table.printReply;
table.streamReply = streamReply.bind(null, displayPrompt, newLine);
table.sr = table.streamReply;
table.createMetadata = createMetadata;
table.cm = createMetadata;
table.printMetadata = printMetadata.bind(null, displayPrompt, newLine);
table.pm = table.printMetadata;
}
if (ev && ev.length > 0) {
let scope = {};
loadGlobals(scope);
loadVars(scope, () => {}, () => {});
new vm.Script(ev, { displayErrors: true }); // We only use this to get nice compile errors
_eval(ev, scope);
} else {
printUsage(
service.package,
service.name,
address,
service.def.service,
args
).then(() => {
console.log("");
let replOpts = {
prompt: getPrompt(service.name, address),
ignoreUndefined: true,
replMode: repl.REPL_MODE_MAGIC
};
let rs = repl.start(replOpts);
loadVars(rs.context, rs.displayPrompt.bind(rs), console.log);
});
}
}
function loadEval(args) {
if (args.eval) {
return args.eval;
} else if (args.exec) {
return fs.readFileSync(args.exec);
} else {
return undefined;
}
}
function loadGlobals(ctx) {
for (let prop in global) {
ctx[prop] = global[prop];
}
}
function createCredentials(options) {
if (options.insecure) {
return grpc.credentials.createInsecure();
}
if (!options.rootCert) {
return grpc.credentials.createSsl();
}
let rootCert = undefined;
let privateKey = undefined;
let certChain = undefined;
try {
if (options.rootCert) {
rootCert = fs.readFileSync(options.rootCert);
}
if (options.privateKey) {
privateKey = fs.readFileSync(options.privateKey);
}
if (options.certChain) {
certChain = fs.readFileSync(options.certChain);
}
} catch (e) {
console.error("Unable to load custom SSL certs: " + e);
process.exit(1);
}
return grpc.credentials.createSsl(rootCert, privateKey, certChain);
}
function createMetadata(metadata) {
if (metadata instanceof grpc.Metadata) {
return metadata;
}
var meta = new grpc.Metadata();
for (var k in metadata) {
var v = metadata[k];
if (typeof v !== "string") {
v = v.toString();
}
meta.add(k, v);
}
return meta;
}
function printUsage(pkg, serviceName, address, service, args) {
return protobuf.load(args.proto).then(root => {
let def = root.lookup(serviceName);
console.log(
"\nConnecting to %s.%s on %s. Available globals:\n",
pkg,
serviceName,
address
);
console.log(
" " + "client".red + " - the client connection to %s",
serviceName
);
Object.keys(def.methods).map(name => {
let method = def.methods[name];
let callback = method.responseStream ? "" : ", callback";
let returnPrefix = method.responseStream ? "stream ".grey : "";
console.log(
` %s (%s${callback}) %s (%s)`,
name.green,
method.requestType,
"returns".gray,
`${returnPrefix}${method.responseType}`
);
});
console.log();
function printCmd(cmd, desc, alias) {
console.log(
" " + cmd.red + " - " + desc + " (alias: " + alias.red + ")"
);
}
printCmd("printReply", "function to easily print a unary call reply", "pr");
printCmd(
"streamReply",
"function to easily print stream call replies",
"sr"
);
printCmd(
"createMetadata",
"convert JS objects into grpc metadata instances",
"cm"
);
printCmd(
"printMetadata",
"function to easily print a unary call's metadata",
"pm"
);
});
}
function getPrompt(serviceName, address) {
return serviceName.blue + "@" + address + "> ";
}
function printReply(displayPrompt, newLine, err, reply) {
newLine();
if (err) {
if (err.metadata) {
err.metadata = err.metadata.getMap();
}
console.log("Error: ".red, err);
} else {
console.log(JSON.stringify(reply, false, " "));
displayPrompt();
}
}
function printMetadata(displayPrompt, newLine, metadata) {
newLine();
let obj = {
Metadata: metadata.getMap()
};
console.log(JSON.stringify(obj, false, " "));
displayPrompt();
}
function streamReply(displayPrompt, newLine, reply) {
newLine();
console.log(JSON.stringify(reply, false, " "));
displayPrompt();
}
module.exports = createClient;