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Commit 5a6340b7 authored by didi's avatar didi
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allow negative settledBalances instead of intermediate stream settlement. refs #2

parent 58111850
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backend/contracts/Streem.sol
View file @ 5a6340b7
......@@ -16,7 +16,7 @@ contract Streem {
* It's just an implementation detail - the "settled" fraction of balance is in no way different or superior to
* the "unsettled" one.
*/
mapping (address => uint256) settledBalances;
mapping (address => int256) settledBalances;
struct Stream {
address sender;
......@@ -41,7 +41,7 @@ contract Streem {
// constructor
function Streem(uint initialSupply) {
owner = msg.sender;
settledBalances[msg.sender] = initialSupply;
settledBalances[msg.sender] = int(initialSupply);
totalSupply = initialSupply;
streams.push(Stream(0,0,0,0)); // empty first element for implicit null-like semantics
}
......@@ -70,8 +70,8 @@ contract Streem {
var settleBal = dt * s.perSecond;
var naiveBal = naiveStreamBalance(s); // remember before manipulating the stream
settledBalances[s.sender] -= settleBal;
settledBalances[s.receiver] += settleBal; // inS.receiver == msg.sender
settledBalances[s.sender] -= int(settleBal);
settledBalances[s.receiver] += int(settleBal); // inS.receiver == msg.sender
// TODO: make sure we really don't need an extra field for this intermediate settlement.
// For correct behaviour, it's irrelevant what the start time of the stream is.
// Applications can rely on the StreamOpened-Event for the UI.
......@@ -101,16 +101,18 @@ contract Streem {
assert(_value > 0 && balanceOf(msg.sender) >= _value);
// if the settled balance doesn't suffice, settle the available funds of the ingoing stream.
if(settledBalances[msg.sender] < _value) {
/*
if(settledBalances[msg.sender] < int(_value)) {
var inS = getInStreamOf(msg.sender);
settleStream(inS);
// lets check again! TODO: once the logic was validated / proofed, this checks should be superfluous
assert(balanceOf(msg.sender) >= _value);
}
*/
settledBalances[msg.sender] -= _value;
settledBalances[_to] += _value;
settledBalances[msg.sender] -= int(_value);
settledBalances[_to] += int(_value);
Transfer(msg.sender, _to, _value);
}
......@@ -157,9 +159,12 @@ contract Streem {
var inS = getInStreamOf(s.sender);
uint256 isb = exists(inS) ? streamBalance(inS) : 0;
uint sb = settledBalances[s.sender];
int sb = settledBalances[s.sender];
return min(osb, sb + isb);
// TODO: Proof needed
assert(sb + int(isb) >= 0);
return min(osb, uint(sb + int(isb)));
}
// this balance function can return a negative value if an outgoing stream went "under water"
......@@ -194,7 +199,8 @@ contract Streem {
uint256 outStreamBal = exists(outS) ? streamBalance(outS) : 0;
// TODO: check overflow before casting
return settledBalances[_owner] + inStreamBal - outStreamBal;
assert(settledBalances[_owner] + int(inStreamBal) - int(outStreamBal) >= 0);
return uint(settledBalances[_owner] + int(inStreamBal) -int(outStreamBal));
}
// TODO: implement the empty function?
......@@ -205,7 +211,7 @@ contract Streem {
// TODO: this is just for the test token. Issuance mechanism for mainnet token to be decided.
function dev_issueTo(address receiver, uint256 amount) {
require(msg.sender == owner);
settledBalances[receiver] += amount;
settledBalances[receiver] += int(amount);
totalSupply += amount;
}
......@@ -217,7 +223,7 @@ contract Streem {
inStreamPtrs[msg.sender] = 0;
if(msg.sender == owner) {
settledBalances[msg.sender] = totalSupply;
settledBalances[msg.sender] = int(totalSupply);
delete streams;
streams.push(Stream(0,0,0,0));
......
frontend/js/streem_contract.js
View file @ 5a6340b7
......@@ -207,15 +207,15 @@ const contract = {
"name": "dev_inStream",
"outputs": [
{
"name": "addr",
"name": "",
"type": "address"
},
{
"name": "speed",
"name": "",
"type": "uint256"
},
{
"name": "age",
"name": "",
"type": "uint256"
}
],
......@@ -317,7 +317,7 @@ const contract = {
"type": "event"
}
],
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"networks": {
"1500075197859": {
"events": {
......@@ -982,10 +982,10 @@ const contract = {
}
},
"links": {},
"address": "0x58c5cd125283b58476af87fe8c53c11ba0f7a735",
"updated_at": 1502035108745
"address": "0xc5dc2ba3aee4b8c2cdc659a27118a5c5317705dd",
"updated_at": 1502119211001
}
},
"schema_version": "0.0.5",
"updated_at": 1502035108745
"updated_at": 1502119211001
}
\ No newline at end of file
frontend/js/test.js
View file @ 5a6340b7
......@@ -42,15 +42,16 @@ function initContract() {
})
}
const nrTestAccounts = 5
// for f it expects a function which takes an address as argument
function execForTestAccs(f) {
for(let i=0; i<3; i++) {
function applyForTestAccs(f) {
for(let i=0; i<nrTestAccounts; i++) {
f(web3.eth.accounts[i])
}
}
function updateDetailTable() {
execForTestAccs( (addr, i) => {
applyForTestAccs( (addr, i) => {
streem.balanceOf(addr, (err, ret) => {
document.getElementById(`${addr}-bal`).innerHTML = web3.toDecimal(ret)
})
......@@ -114,6 +115,7 @@ function initTableRowFor(addr) {
table.appendChild(row)
}
var accs = []
window.addEventListener('load', () => {
console.log('window loaded')
......@@ -135,11 +137,12 @@ window.addEventListener('load', () => {
keepBlockchainAlive(5) // testrpc seems to have a lower limit of 5 sec
}
if(web3.eth.accounts.length < 3) {
if(web3.eth.accounts.length < nrTestAccounts) {
alert("ERROR: less than 3 accounts available")
}
execForTestAccs( addr => initTableRowFor(addr) )
applyForTestAccs(addr => accs.push(addr) ) // for convenience in JS console
applyForTestAccs(addr => initTableRowFor(addr) )
})
// ############################################################################
......@@ -147,7 +150,7 @@ window.addEventListener('load', () => {
// closes the outgoing streams of the test accounts
// this will throw an expection for accounts without outstream. Doesn't hurt us.
function close() {
execForTestAccs( addr => {streem.closeStream({from: addr, gas: 200000}, (err, ret) => {
applyForTestAccs(addr => {streem.closeStream({from: addr, gas: 200000}, (err, ret) => {
if(err) console.log(`closeStream failed for ${addr}`)
})})
}
......@@ -160,38 +163,63 @@ function freeze() {
}
function reset() {
execForTestAccs( addr => streem.dev_reset( {from: addr, gas: 2000000} )) //note that this is more gas!
console.log('resetting...')
applyForTestAccs(addr => streem.dev_reset( {from: addr, gas: 2000000} )) //note that this is more gas!
}
// test: balances are correct
function test1() {
// stream1: speed 1 from addr0 to addr1
console.log('starting stream1')
console.log('open stream1: speed 1 from addr0 to addr1')
streem.openStream(web3.eth.accounts[1], 1, {from: web3.eth.accounts[0], gas: 200000})
// stream2: speed 1 from addr1 to addr2
console.log('starting stream2')
console.log('open stream2: speed 1 from addr1 to addr2')
streem.openStream(web3.eth.accounts[2], 1, {from: web3.eth.accounts[1], gas: 200000})
}
// test: dryed out stream
function test1a() {
// ...
// close stream1
// wait 5
// close stream2
console.log('closing stream1')
streem.closeStream({from: web3.eth.accounts[0], gas: 200000})
console.log('waiting 20 sec...')
setTimeout( () => {
console.log('closing stream2')
streem.closeStream({from: web3.eth.accounts[1], gas: 200000})
}, 20000)
// assert: bal(addr1) is 0, stream2 stalls
}
// test: underfunded stream
function test1b() {
// ...
test1()
// stream with speed 1 from addr0 to addr1
// stream with speed 2 from addr1 to addr2
// wait 5
function test2() {
console.log('open stream1: speed 1 from addr0 to addr1')
streem.openStream(web3.eth.accounts[1], 1, {from: web3.eth.accounts[0], gas: 200000})
console.log('open stream2: speed 2 from addr1 to addr2')
streem.openStream(web3.eth.accounts[2], 2, {from: web3.eth.accounts[1], gas: 200000})
// wait 10
// assert: bal(addr1) is 0, lab(addr2) is 5
// close stream1
// close stream2
// assert: bal(addr1) is 0, lab(addr2) is 5
}
function test3() {
console.log('open stream1: speed 1 from addr0 to addr1')
streem.openStream(web3.eth.accounts[1], 1, {from: web3.eth.accounts[0], gas: 200000})
console.log('open stream2: speed 1 from addr1 to addr0')
streem.openStream(web3.eth.accounts[0], 1, {from: web3.eth.accounts[1], gas: 200000})
}
function test4() {
console.log('open stream1: speed 1 from addr0 to addr1')
streem.openStream(web3.eth.accounts[1], 1, {from: web3.eth.accounts[0], gas: 200000})
console.log('open stream2: speed 1 from addr1 to addr2')
streem.openStream(web3.eth.accounts[2], 1, {from: web3.eth.accounts[1], gas: 200000})
console.log('open stream3: speed 1 from addr2 to addr0')
streem.openStream(web3.eth.accounts[0], 1, {from: web3.eth.accounts[2], gas: 200000})
}
\ No newline at end of file
frontend/test.html
View file @ 5a6340b7
......@@ -35,9 +35,11 @@ Size of streams array: <span id="nrstreams">-</span><br>
<hr>
<button id="test1">Test1</button><br>
<button id="test2">Test1a</button><br>
<button id="test3">Test1b</button><br>
<button id="test1">Test1: open A->B (1), open B->C (1)</button><br>
<button id="test1a">Test1a: close A->B, wait 20, close B->C</button><br>
<button id="test2">Test2: open A->B (1), open B->C (2)</button><br>
<button id="test3">Test3: open A->B (1), open B->A (1)</button><br>
<button id="test4">Test4: open A->B (1), open B->C (1), open C->A (1)</button><br>
<script type="text/javascript" src="lib/web3.js"></script>
<script type="text/javascript" src="js/streem_contract.js"></script>
......
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