Javascript console that exposes Filecoin API

[elmattic]

Summary of changes

Changes introduced in this pull request:

• Add builtin Javascript console for interacting with the Filecoin JSON-RPC API

Run it with:

$ ./target/release/forest-cli --token $TOKEN attach                                            
Welcome to the Forest Javascript console!

To exit, press ctrl-d or type :quit
> showWallet()
Address                                         Balance
f12k7gkx5buk4rwe53zjb6ma5q47jetj3ual73rfq       10000 attoFIL
f1a4uu6j4kdtpfuzbqeaitlqgsdxbsbysayl32bzi       99999998974003915915 attoFIL
f1bfl2qqwnnbkkx44cvmvs4rvtsp6nrnksetrkzma       99999999197203014528 attoFIL
f1edwx7zalu54vvoytpuviurt6bypdsqux3ta4dxa       0 attoFIL
f1elanep3pvyahdelqqtyxsst2j6bxks4sdl7be3q       0 attoFIL
f1fzb3vu2iwu3efrctucm337dfinj6dgicz7e7qgy       0 attoFIL
f1gb4gte4e42wclh6jgtf4tdqvfyf3gcjv4vox2ia       6000036789 attoFIL
f1gundv7oc7bo6tevxccqpwginlgki7yqk4na2tyi       30000 attoFIL
f1hyge7fhoyifmhxjzzj37s7eowqeibsjh7auptea       20000 attoFIL
f1jxa25q6fawbhloee462kyvwjhfolxj7rkh26t3q       0 attoFIL
f1l5kiz7hmrbs7blm23sn6clyweoyqpyzc5anqvfi       0 attoFIL
f1ngj547fvvm4tryw4zwu37uqfure6rgm46b5cj6a       7486950930 attoFIL
f1wteveg4sxbtbo3tgz4dgk5owq6epd6fvk5m654y       100080 attoFIL

> showSyncStatus()
sync status:
Stage:  complete
Height: 281967

You can also use custom modules and exec flag, ie:

$ ./target/release/forest-cli --token $TOKEN attach --jspath .. --exec "const Math = require('calc.js'); console.log(Math.add(39,3));"
Loading: ../calc.js
42

where calc.js:

module.exports = {
    add: function (a, b) {
      return a + b;
    },
    multiply: function (a, b) {
      return a * b;
    },
};

Reference issue to close (if applicable)

Closes

Other information and links

Inspired by: https://geth.ethereum.org/docs/interacting-with-geth/javascript-console

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[elmattic]

@LesnyRumcajs looks good for you now?

[LesnyRumcajs]

Can't test it now because calibnet is down on our side, but I have faith it works. :)

[lemmih]

Faith!