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gleam_mongo

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A mongodb driver for gleam

Retired package: Renamed - Republished as mungo
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gleam_mongo src mongo client.gleam
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src/mongo/client.gleam 

import tcp

import bson/types

import gleam/bit_string

import bson.{decode, encode}



pub opaque type Connection {

  Connection(socket: tcp.Socket)

}



pub opaque type Database {

  Database(connection: Connection, name: String)

}



pub type Collection {

  Collection(db: Database, name: String)

}



pub fn connect(ip: String, port: Int) -> Result(Connection, Nil) {

  case tcp.connect(ip, port) {

    Ok(socket) -> Ok(Connection(socket))

    Error(Nil) -> Error(Nil)

  }

}



pub fn db(connection: Connection, name: String) -> Database {

  Database(connection, name)

}



pub fn collection(db: Database, name: String) -> Collection {

  Collection(db, name)

}



pub fn execute(

  collection: Collection,

  cmd: types.Value,

) -> Result(List(#(String, types.Value)), Nil) {

  assert types.Document(body) = cmd

  let cmd = [#("$db", types.Str(collection.db.name)), ..body]

  let encoded = encode(cmd)

  let size = bit_string.byte_size(encoded) + 21

  let packet =

    [<<size:32-little, 0:32, 0:32, 2013:32-little, 0:32, 0>>, encoded]

    |> bit_string.concat



  case collection.db.connection.socket

  |> tcp.send(packet) {

    tcp.OK ->

      case collection.db.connection.socket

      |> tcp.receive() {

        Ok(response) -> {

          let <<_:168, rest:bit_string>> = response

          case decode(rest) {

            Ok(result) -> Ok(result)

            Error(Nil) -> Error(Nil)

          }

        }

        Error(Nil) -> Error(Nil)

      }

    _ -> Error(Nil)

  }

}