path: root/ethereal/assets/ethereum.js

// Main Ethereum library
window.eth = {
    prototype: Object(),

    // Retrieve block
    //
    // Either supply a number or a string. Type is determent for the lookup method
    // string - Retrieves the block by looking up the hash
    // number - Retrieves the block by looking up the block number
        getBlock: function(numberOrHash, cb) {
                var func;
                if(typeof numberOrHash == "string") {
                        func =  "getBlockByHash";
                } else {
                        func =  "getBlockByNumber";
                }
                postData({call: func, args: [numberOrHash]}, cb);
        },

    // Create transaction
    //
    // Creates a transaction with the current account
    // If no recipient is set, the Ethereum API will see it as a contract creation
    transact: function(sec, recipient, value, gas, gasPrice, data, cb) {
        postData({call: "transact", args: [sec, recipient, value, gas, gasPrice, data]}, cb);
    },

    create: function(sec, value, gas, gasPrice, init, body, cb) {
        postData({call: "create", args: [sec, value, gas, gasPrice, init, body]}, cb);
    },

    getStorageAt: function(address, storageAddress, cb) {
        postData({call: "getStorage", args: [address, storageAddress]}, cb);
    },

    getKey: function(cb) {
        postData({call: "getKey"}, cb);
    },

    getBalanceAt: function(address, cb) {
        postData({call: "getBalance", args: [address]}, cb);
    },

    watch: function(address, storageAddrOrCb, cb) {
        var ev;
        if(cb === undefined) {
            cb = storageAddrOrCb;
            storageAddrOrCb = "";
            ev = "object:"+address;
        } else {
            ev = "storage:"+address+":"+storageAddrOrCb;
        }

        eth.on(ev, cb)

        postData({call: "watch", args: [address, storageAddrOrCb]});
    },

    disconnect: function(address, storageAddrOrCb, cb) {
        var ev;
        if(cb === undefined) {
            cb = storageAddrOrCb;
            storageAddrOrCb = "";
            ev = "object:"+address;
        } else {
            ev = "storage:"+address+":"+storageAddrOrCb;
        }

        eth.off(ev, cb)

        postData({call: "disconnect", args: [address, storageAddrOrCb]});
    },

    on: function(event, cb) {
        if(eth._onCallbacks[event] === undefined) {
            eth._onCallbacks[event] = [];
        }

        eth._onCallbacks[event].push(cb);

        return this
    },

    off: function(event, cb) {
        if(eth._onCallbacks[event] !== undefined) {
            var callbacks = eth._onCallbacks[event];
            for(var i = 0; i < callbacks.length; i++) {
                if(callbacks[i] === cb) {
                    delete callbacks[i];
                }
            }
        }

        return this
    },

    trigger: function(event, data) {
        var callbacks = eth._onCallbacks[event];
        if(callbacks !== undefined) {
            for(var i = 0; i < callbacks.length; i++) {
                callbacks[i](data);
            }
        }
    },
}
window.eth._callbacks = {}
window.eth._onCallbacks = {}

function debug(/**/) {
    var args = arguments;
    var msg = ""
    for(var i = 0; i < args.length; i++){
        if(typeof args[i] == "object") {
            msg += " " + JSON.stringify(args[i])
        } else {
            msg += args[i]
        }
    }

    document.getElementById("debug").innerHTML += "<br>" + msg
}

// Helper function for generating pseudo callbacks and sending data to the QML part of the application
function postData(data, cb) {
    data._seed = Math.floor(Math.random() * 1000000)
    if(cb) {
        eth._callbacks[data._seed] = cb;
    }

    if(data.args === undefined) {
        data.args = [];
    }

    navigator.qt.postMessage(JSON.stringify(data));
}

navigator.qt.onmessage = function(ev) {
    var data = JSON.parse(ev.data)

    if(data._event !== undefined) {
        eth.trigger(data._event, data.data);
    } else {
        if(data._seed) {
            var cb = eth._callbacks[data._seed];
            if(cb) {
                // Call the callback
                cb(data.data);
                // Remove the "trigger" callback
                delete eth._callbacks[ev._seed];
            }
        }
    }
}