读取 Javascript 中的本地 BSON 文件

Question

I have an HTML 5 game. I'm using webpack/typescript for development.

There is some data I have which I was including by using require like the following

    const dataJson = require('scripts/data/data.json');

I would like to do the equivalent, except with bson. I tried the naive approach of doing something like this

    const dataJson = require('scripts/data/data.bson');

but this of course fails since there is no loader (won't compile with currently no loaders are configured to process this file. ).

I'd like to then include the file locally, load the file and then deserialize the bson. Or I'd like to embed the bson like when using require . This is some tool generated data, so it will be in a data file.

I haven't been able to figure it out. I've tried the following. But this results in the result containing either the bits of File or what looks like the content type (if done as readAsDataURL ).

What I have tried

    const file = new File(['data'], 'assets/data.bson', { type: 'application/bson' });
    const reader = new FileReader();
    reader.onload=(theFile) => {
        if (theFile.target) {
            console.log(theFile.target.result);
        }

    } ;
    reader.readAsDataURL(file);
    //reader.readAsBinaryString(file);

What is the correct method to load a local binary file? Presumably, once I have the data, I can just call deserialize from the bson package.

Okay, I'm adding some corrections here. My method to read the files is wrong. I know understand File will actually create a file. So when this is passed to FileReader it gets the value of the both bits passed in.

I have since discovered I can get the local files 2 ways. I can use XMLHttpRequest as well as the raw-loader loader.

However once I do this. I cannot seem to convert the contents into JSON using bson . Any variant of deserialize , serialize , parse , or stringify has some issue.

Does anyone happen to have the correct method to convert the BSON contents into either a Javascript Object?

Note that the BSON is generated from python using pymongo . My code to generate the BSON is the following.

            with open(args.output_bson, 'wb') as fp:
                encoded = bson.encode(data_meta.to_dict())
                fp.write(encoded)

to_dict is a dictionary. I output both the JSON (using json ) and BSON.

I also tested the file with bsondump and it does indeed convert to JSON. So it does appear the file I've loaded is valid.

Answer 1

you can use bson

then call:

BSON.deserialize(theFile.target.result);