We Keep Coding

Is there a way to get a variable or function from one file to another file in javascript?

I have a file for my Blockchain called gale.js, and I need the Blockchain variable to get into my miner.js file:
let galeCoin = new Blockchain(); // My Blockchain
Can I access this variable from my miner.js file so I can run the minePendingTransactions() function from the Blockchain class
var galeCoin = /* the coin imported from the gale.js file */
var minerAdress = "0xOTUYboIUYEO5C274OUIYGo8isYOCYW6o87TO"; // SHA256 Hash for the miner
while (true) {
minePendingTransactions(minerAdress); // mine (forever)
}
I would also like to access this variable in my user.js file:
var galeCoin = /* the coin imported from the gale.js file */
var userAdress = galeCoin.newAdress(); // A new adress for the user
// I will add the code here later...
And many other files!
But I can't seen to access the variable from the other files!
I tried this:
let galeCoin = new Blockchain();
export { galeCoin };
import { galeCoin } from './gale.js'
but that gives me this error when I run miner.js using node miner.js:
node:internal/modules/cjs/loader:936
throw err;
^
Error: Cannot find module 'gale.js'
Require stack:
- /Users/Movies/Desktop/devProjects/Blockchain/SecondTry/miner.js
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.<anonymous> (/Users/Movies/Desktop/devProjects/Blockchain/SecondTry/miner.js:1:1)
at Module._compile (node:internal/modules/cjs/loader:1101:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
code: 'MODULE_NOT_FOUND',
requireStack: [ '/Users/Movies/Desktop/devProjects/Blockchain/SecondTry/miner.js' ]
}
I dont understand the error message
I need help as soon as posible!
NOTE: My files are in /Users/Movies/Desktop/devProjects/Blockchain/SecondTry/

Try using the following to import galeCoin from gale.js:
var {galeCoin} = require('./gale.js');
You'll also need to export the galeCoin object from gale.js. You can use the following (append somewhere at the end of gale.js):
module.exports = {galeCoin};
Then you're going to want to run npm install gale.js to ensure that module is added to the node_modules directory. For this you're going to want to make sure the node_modules is in the same director as miner.js. If it is not, npm -g install gale.js.
I should note, I'm assuming you're using node.js, which from the error you threw, seems to be the case.
I hope this was helpful:)

Try :
export let galeCoin = new Blockchain();
//add export statement at the beginning of the line where you declare your variable
You can read about it here: https://javascript.info/import-export

IISNode caching old file names and I can't seem to update it

Hello and thank you in advance.
This may be a rather simple scenario, however, I am new to Nodejs.
I have a main script which I am calling from javascript using IISNode. Everything has worked great until I decided to rename a dependency file.
Files involved:
embed.js <- main script
dev2.js <- required custom script by embed.js
which reads this json file
fred.json renamed to chartio.json
embed.js code relevant to issue:
var http = require('http');
var jwt = require('jwt-simple');
var dashinfo = require('./dev2');
var ORGANIZATION_SECRET = dashinfo.getkey();
var ORG_ID = dashinfo.getorgid();
dev2.js code relevant to issue:
var mariadb = require('mariadb');
var connectioninfo = require('./chartio.json');
module.exports = {
getkey: function () {
return connectioninfo.connection.apikey;
},
getorgid: function () {
return connectioninfo.connection.orgid;
},
and finally, I have my charti0.json file which I cannot post due to sensitive data.
I assure you that everything was working until I renamed fred.json to chartio.json.
I have looked online to see if there is a way to clear the cache but I couldn't find anything that seemed to work, though I am a novice. I also looked at logs. I tried running this in IE and Chrome
This is what I see logged from the error:
Application has thrown an uncaught exception and is terminated:
Error: Cannot find module './fred.json'
Require stack:
- C:\xxx\xxx\GPS411\node\dev2.js
- C:\xxx\xxx\GPS411\node\embed.js
- C:\Program Files (x86)\iisnode\interceptor.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:794:15)
at Function.Module._load (internal/modules/cjs/loader.js:687:27)
at Module.require (internal/modules/cjs/loader.js:849:19)
at require (internal/modules/cjs/helpers.js:74:18)
at Object.<anonymous> (C:\Omnitracs\sylectus-trunk\GPS411\node\dev2.js:3:22)
at Module._compile (internal/modules/cjs/loader.js:956:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Module.require (internal/modules/cjs/loader.js:849:19)

Folks, I was able to get this working by doing an old fashion workstation reboot. I changed the filename again to test if the issue returns and it seems to recognize the file changes now. I guess I was just stuck in cache-land, but now I'm free. Thanks for your consideration.

Plain text SASL authentication in gremlin-javascript

I'm trying to connect to a Gremlin server with the JavaScript driver variant.
Up to package version 2.7.0, this is done easily by passing options to Gremlin.createClient() as in this example for Azure Cosmos DB:
const client = Gremlin.createClient(
config.port,
config.endpoint,
{
"session": false,
"ssl": true,
"user": `/dbs/${config.database}/colls/${config.collection}`,
"password": config.primaryKey
}
);
In newer versions of the package I can't get it done. The official docs suggest using gremlin.driver.auth.PlainTextSaslAuthenticator. However, that method seems to be not implemented in the package and returns TypeError: Cannot read property 'PlainTextSaslAuthenticator' of undefined
My test code (same config.js as in the working example):
const gremlin = require("gremlin");
const config = require("./config");
const Graph = gremlin.structure.Graph;
const DriverRemoteConnection = gremlin.driver.DriverRemoteConnection;
const graph = new Graph();
const authenticator = new gremlin.driver.auth.PlainTextSaslAuthenticator(
`/dbs/${config.database}/colls/${config.collection}`,
config.primaryKey
);
const g = graph.traversal().withRemote(new DriverRemoteConnection(`ws://${config.endpoint}:${config.port}`, { authenticator });
Return:
C:\repos\gremlin-test\index.js:9
const authenticator = new gremlin.driver.auth.PlainTextSaslAuthenticator(
^
TypeError: Cannot read property 'PlainTextSaslAuthenticator' of undefined
at Object.<anonymous> (C:\repos\gremlin-test\index.js:9:47)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Function.Module.runMain (module.js:693:10)
at startup (bootstrap_node.js:191:16)
at bootstrap_node.js:612:3
Anyone know a solution to this?

I've not got too much experience with Gremlin.js, but I just downloaded it and have manually searched through all of its files - I can't find any trace of a PlainTextSaslAuthenticator function or its declaration.
This could mean one of two three -
Its function has been (accidentally) removed
It uses a third party package that has been (accidentally) removed
It has not been added to the package yet
Upon a swift Google search, I found this link which seems to show it being added to /lib/driver/auth, but that directory doesn't seem to exist in the package I got through npm install gremlin. Perhaps it is yet to be released?
I would therefore suggest you raise an issue on Github, but it seems that repository you linked doesn't allow for issues to be raised. So perhaps email/contact the author?
EDIT:
Thanks to Stephen for the link - the code hasn't been merged to the package yet. Keep track of it here.

Not able to access another module's function in NodeJS

To break it down and simplify it a bit: Imagine I have three files in my project. One main.js, and two modules: moduleA.js and moduleB.js.
main.js accesses moduleA.js which calls a function from moduleB.js. Now moduleB.js finds out that it needs an information that is only available in moduleA.js. Of course moduleB.js tries to access a function in moduleA.js which is technically able to give this information to moduleB.js but there is an error.
Here is the simplified code.
main.js
var a = require("./moduleA.js");
console.log(a.respond());
moduleA.js
var b = require("./moduleB.js");
module.exports = {
respond: function(){
return b.returnAnswerForModuleA();
},
getSomeInformationOnlyAvailableInA: function(){
return "This is the information we need!";
}
};
moduleB.js
var a = require("./moduleA.js");
module.exports = {
returnAnswerForModuleA: function(){
return a.getSomeInformationOnlyAvailableInA()
}
};
Here is the error message:
/Users/Tim/Code/ChatBot/test/moduleB.js:5
return a.getSomeInformationOnlyAvailableInA()
^
TypeError: a.getSomeInformationOnlyAvailableInA is not a function
at Object.module.exports.returnAnswerForModuleA (/Users/Tim/Code/ChatBot/test/moduleB.js:5:16)
at Object.module.exports.respond (/Users/Tim/Code/ChatBot/test/moduleA.js:5:18)
at Object.<anonymous> (/Users/Tim/Code/ChatBot/test/main.js:3:15)
at Module._compile (module.js:425:26)
at Object.Module._extensions..js (module.js:432:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:311:12)
at Function.Module.runMain (module.js:457:10)
at startup (node.js:136:18)
at node.js:972:3
Why cannot I access moduleA.js from moduleB.js?
To restructure my code is not really an option!
Thanks for help!

This looks like an issue with circular dependencies in node.js where a circular dependency causes one module to be resolved as an empty object (thus causing the error you see). See these articles which explain:
Node.js and circular dependencies
Circular dependencies in Node.js
The first article offers two possible solutions: "delaying invocation of dependency until runtime" and "replace circular dependency with dependency injection".
I think you can work around the circular issue by changing module B to this:
var moduleA;
module.exports = {
returnAnswerForModuleA: function(){
if (!moduleA) {
moduleA = require("./moduleA.js");
}
return moduleA.getSomeInformationOnlyAvailableInA()
}
};
This delays the loading of module A in module B until runtime by which time, it is already successfully loaded and in the module cache, thus avoiding the circular dependency.

Node JS is says method isn't there when it clearly is

Alright, so I've created a test project to show off this error. The error being that Node JS can't find my getStr function in my Another object.
This is the code:
test.js
var Another = require('./another.js');
var Other = require('./other.js');
var otherStr = Other.getStr();
console.log(otherStr);
other.js
var Another = require('./another.js');
var str = Another.getStr();
another.js
var Other = require('./other.js');
var str = "other String";
exports.getStr = function(){
return str;
}
And this is my output:
C:\Users\Admin\Desktop\JS DEV\NODE DEV\server\test>node test.js
C:\Users\Admin\Desktop\JS DEV\NODE DEV\server\test\other.js:3
var str = Another.getStr();
^
TypeError: Object #<Object> has no method 'getStr'
at Object.<anonymous> (C:\Users\Admin\Desktop\JS DEV\NODE DEV\server\test\ot
her.js:3:19)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object.<anonymous> (C:\Users\Admin\Desktop\JS DEV\NODE DEV\server\test\an
other.js:1:75)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
C:\Users\Admin\Desktop\JS DEV\NODE DEV\server\test>
So how do I get Node JS to see Another's getStr function in Other?

What you're dealing with here is a circular dependency. Node.js will let you load modules in a circular way but you need to design your code to account for it. Generally speaking, a circular dependency is a sign that the design is suffering from some flaw. In the code you've shown in the question, another requires other but does nothing with it. So the simplest fix would be to change another so that it does not require other.
If you have to keep the circular dependency for some reason or you want to experiment with circular dependencies for learning purposes, then this would be another possible fix:
var str = "other String";
exports.getStr = function(){
return str;
}
var Other = require('./other');
// Actually do something with Other down here.
By the time other is required another will at least have getStr available. So this takes care of the immediate issue. Note however that your other module does not export anything so your test.js file will still fail at var otherStr = Other.getStr(); Probably you forgot to add this:
exports.getStr = function(){
return str;
}
(Note: I've modified the require call so that it requires other without the .js suffix. Generally, you don't want to put suffixes in your require calls. You want to put a module name which Node can resolve to a file, a package, or something else.)