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https://github.com/alexdovzhanyn/bert-elixir
BERT (Binary ERlang Term) serialization library for Javascript (with Elixir support)
https://github.com/alexdovzhanyn/bert-elixir
bert elixir erlang javascript serialization-library
Last synced: 6 days ago
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BERT (Binary ERlang Term) serialization library for Javascript (with Elixir support)
- Host: GitHub
- URL: https://github.com/alexdovzhanyn/bert-elixir
- Owner: alexdovzhanyn
- Created: 2018-09-18T03:47:10.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2024-06-13T01:11:28.000Z (7 months ago)
- Last Synced: 2024-12-06T00:41:06.874Z (20 days ago)
- Topics: bert, elixir, erlang, javascript, serialization-library
- Language: JavaScript
- Homepage:
- Size: 125 KB
- Stars: 34
- Watchers: 7
- Forks: 6
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# BERT
Binary ERlang Term serialization library for Javascript. (An updated version of [this repo](https://github.com/rustyio/BERT-JS) )
## Usage
--------------------------------
### Example Usage
When needing to consume data in Javascript from an Erlang system, the Erlang
system can simply send encoded binary data:
*Elixir/Erlang:*
```elixir
# This is Elixir code, but function calls will be very similar in Erlang
personData = %{
name: "Bob",
age: 32,
eye_color: "Brown",
personality_traits: [
"Funny",
"Inquisitive"
]
}
# Convert to binary
:erlang.term_to_binary(personData)
# .... Code that sends binary data to javascript
```
*Javascript:*
```javascript
// ... Code that receives binary data from erlang/elixir and stores it
// to a variable, personData
const Bert = require('bert-elixir')
const decodedPerson = Bert.decode(personData)
/*
=> { age: 32,
eye_color: 'Brown',
name: 'Bob',
personality_traits: [ 'Funny', 'Inquisitive' ]
}
*/
```
Modifying this data and sending it back to Erlang/Elixir would be as simple as:
*Javascript:*
```javascript
// ... Assuming we have a decodedPerson object
decodedPerson.age = 38
decodedPerson.name = 'Robert'
const reEncodedPerson = Bert.encode(decodedPerson)
// ... Send the binary
```
*Elixir/Erlang:*
```elixir
# ... After having received binary data and setting it to variable modifiedPersonData:
decodedPerson = :erlang.binary_to_term(modifiedPersonData, [:safe])
# => %{ age: 38, eye_color: "Brown", name: "Robert", personality_traits: ["Funny", "Inquisitive"] }
```
safe option should be always used when decoding an untrusted input, make also sure to have already all required atoms in the atoms table.
### Encoding
#### Maps (Elixir)
Javascript objects map directly to Maps in Erlang
```javascript
const Bert = require('bert-elixir')
// To encode a javascript object to an elixir map:
const mapToEncode = { a: 1, b: "hello!", c: [1, 2, 3] }
const encodedMap = Bert.encode(mapToEncode)
// BinaryToList shows individual bytes as a javascript array
console.log(Bert.binaryToList(encodedMap))
// => [ 131, 116, 0, 0, 0, 3, 100, 0, 1, 97, 97, 1, 100, 0, 1, 98, 109, 0, 0, 0, 6, 104, 101, 108, 108, 111, 33, 100, 0, 1, 99, 108, 0, 0, 0, 3, 97, 1, 97, 2, 97, 3, 106 ]
```
#### Lists
Javascript arrays map to Erlang Lists
```javascript
const Bert = require('bert-elixir')
const arrayToEncode = ['hello', 'world', 32, [{ key: "value" }]]
const encodedArray = Bert.encode(arrayToEncode)
console.log(Bert.binaryToList(encodedArray))
```
Todo:
- [ ] Write docs for rest of data types
- [ ] Return `nil` as `null` instead of `'nil'`
- [ ] Add support for NEW_FLOAT_EXT
--------------------------------
### Decoding
Decoding is typically much simpler than encoding. Just pass the given Binary Erlang Term:
```javascript
const Bert = require('bert-elixir')
// We're showing the term as an array of bytes here for clarity.
// You'll more likely have a string
const erlangTerm = [131, 116, 0, 0, 0, 3, 100, 0, 1, 97, 97, 1, 100, 0, 1, 98, 97, 2, 100, 0, 1, 99, 116, 0, 0, 0, 1, 100, 0, 4, 119, 111, 97, 104, 109, 0, 0, 0, 8, 97, 32, 115, 116, 114, 105, 110, 103]
.map(x => String.fromCharCode(x)).join('') // Convert the array to a string
const decoded = Bert.decode(erlangTerm)
console.log(decoded)
// => { a: 1, b: 2, c: { woah: 'a string' } }
```