Add comments, remove dead code, remove make install for dead contracts

CAVEAT

@@ -0,0 +1,5 @@
+The contract is intended for slow rates of decay (e.g. 2% per month). Very high levels of decay (2% per minute) will lead to overflows, and will need a more flexible implementation to support it.
+
+The contract is written with frequent usage in mind. If used for tokens with low usage freqency (e.g. several days idle), it is recommended to run a continuous process triggering the changePeriod() contract call, to reduce the amount of exponential calculation the application of demurrage will trigger.
+
+When changing the period, the supply for the consecutive period will be taken at the time of code execution, and thus not necessarily at the time when the redistribution period threshold was crossed. 

ROADMAP

@@ -0,0 +1,8 @@
+- 0.1.3
+	* Snapshot supply for crossed redistribution thresholds before minting new tokens.
+- 0.1.4
+	* Implement natural logarithm 
+- 0.1.5
+	* Port changes from SingleNocap to SingleCap
+- 0.2.0
+	* Make decay resolutions configurable, to support high levels of decay.

VERSION

@@ -0,0 +1 @@
+0.1.2

python/CHANGELOG

@@ -1,3 +1,7 @@
+- 0.1.2
+	* Add token burn function
+	* Fix gas leak when calculating decay on period change
+	* Remove all but SingleNocap contract in make install
 - 0.1.1
 	* Settable demurrage steps for apply demurrage cli tool
 - 0.1.0

python/erc20_demurrage_token/unittest/base.py

@@ -95,13 +95,6 @@ class TestDemurrage(EthTesterCase):
 
     def setUp(self):
         super(TestDemurrage, self).setUp()
-#        token_deploy = TestTokenDeploy()
-#        self.settings = token_deploy.settings
-#        self.sink_address = token_deploy.sink_address
-#        self.start_block = token_deploy.start_block
-#        self.start_time = token_deploy.start_time
-#        self.default_supply = self.default_supply
-#        self.default_supply_cap = self.default_supply_cap
         period = PERIOD
         try:
             period = getattr(self, 'period')

python/setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = erc20-demurrage-token
-version = 0.1.1
+version = 0.1.2
 description = ERC20 token with redistributed continual demurrage
 author = Louis Holbrook
 author_email = dev@holbrook.no

python/tests/test_burn.py

@@ -33,7 +33,6 @@ class TestBurn(TestDemurrage):
         super(TestBurn, self).setUp()
 
 
-    # tax_level = ppm
     def deploy(self, tax_level=None):
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
         c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
@@ -52,6 +51,7 @@ class TestBurn(TestDemurrage):
         logg.info('deployed with mode {}'.format(self.mode))
 
 
+    # Burn tokens and immediately check balances and supply
     def test_burn_basic(self):
         self.deploy()
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
@@ -92,6 +92,7 @@ class TestBurn(TestDemurrage):
         self.assertEqual(burned, 600000)
 
 
+    # burn tokens and check sink balance and supply after first redistribution period
     def test_burned_redistribution(self):
         self.deploy()
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
@@ -149,7 +150,7 @@ class TestBurn(TestDemurrage):
         self.assert_within_lower(bal, 500000000, 0.0025)
 
 
-
+    # burn tokens and check sink and taxed balance and supply after first redistribution period
     def test_burned_other_redistribution(self):
         self.deploy()
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
@@ -218,6 +219,7 @@ class TestBurn(TestDemurrage):
         self.assert_within_lower(sink_bal, bal, 0.09) # TODO is this ok variance, 1.0 is ppm?
 
 
+    # verify expected results of balance and supply after multiple redistribution periods
     def test_burn_accumulate(self):
         self.deploy(tax_level=2/1000)
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)

python/tests/test_demurrage.py

@@ -40,6 +40,7 @@ class TestDemurragePeriods(TestDemurrage):
         logg.info('deployed with mode {}'.format(self.mode))
 
 
+    # verify that tax level calculation is in ppm as expected
     def test_ppm(self):
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
         c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
@@ -72,6 +73,7 @@ class TestDemurragePeriods(TestDemurrage):
 
 
 
+    # verify balances and supply after multiple demurrage periods
     def test_over_time(self):
         nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
         c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)

solidity/DemurrageTokenSingleNocap.sol

@@ -355,16 +355,15 @@ contract DemurrageTokenSingleCap {
 	}
 
 	// Recalculate the demurrage modifier for the new period
+	// Note that the supply for the consecutive period will be taken at the time of code execution, and thus not necessarily at the time when the redistribution period threshold was crossed.
 	function changePeriod() public returns (bool) {
 		bytes32 currentRedistribution;
 		bytes32 nextRedistribution;
 		uint256 currentPeriod;
-		//uint256 currentDemurrageAmount;
 		uint256 lastDemurrageAmount;
 		bytes32 lastRedistribution;
 		uint256 nextRedistributionDemurrage;
 		uint256 demurrageCounts;
-		//uint256 periodTimestamp;
 		uint256 nextPeriod;
 
 		applyDemurrage();
@@ -373,19 +372,10 @@ contract DemurrageTokenSingleCap {
 			return false;
 		}
 
+		// calculate the decay from previous redistributino
 		lastRedistribution = redistributions[lastPeriod];
 		currentPeriod = toRedistributionPeriod(currentRedistribution);
 		nextPeriod = currentPeriod + 1;
-		//periodTimestamp = getPeriodTimeDelta(currentPeriod);
-
-		//currentDemurrageAmount = demurrageAmount; 
-
-		//demurrageCounts = demurrageCycles(periodTimestamp);
-		//if (demurrageCounts > 0) {
-		//	nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts);
-		//} else {
-		//	nextRedistributionDemurrage = currentDemurrageAmount;
-		//}
 		lastDemurrageAmount = toRedistributionDemurrageModifier(lastRedistribution);
 		demurrageCounts = periodDuration / 60;
 		nextRedistributionDemurrage = decayBy(lastDemurrageAmount, demurrageCounts);
@@ -499,6 +489,7 @@ contract DemurrageTokenSingleCap {
 	}
 
 	// Explicitly and irretrievably burn tokens
+	// Only token minters can burn tokens
 	function burn(uint256 _value) public {
 		require(minter[msg.sender]);
 		require(_value <= account[msg.sender]);

solidity/Makefile

@@ -33,6 +33,10 @@ test: all
 	python ../python/tests/test_pure.py
 
 install: all
+	#cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/
+	cp -v DemurrageTokenSingleNocap.{json,bin} ../python/erc20_demurrage_token/data/
+
+install-broken: all
 	cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/
 	
 .PHONY: test install