Autoloop rework -- easy autoloop

cmd/loop/liquidity.go

@@ -324,6 +324,17 @@ var setParamsCommand = cli.Command{
 			Usage: "the confirmation target for loop in on-chain " +
 				"htlcs",
 		},
+		cli.BoolFlag{
+			Name: "easyautoloop",
+			Usage: "set to true to enable easy autoloop, which " +
+				"will automatically dispatch swaps in order " +
+				"to meet the target local balance",
+		},
+		cli.Uint64Flag{
+			Name: "localbalancesat",
+			Usage: "the target size of total local balance in " +
+				"satoshis, used by easy autoloop",
+		},
 	},
 	Action: setParams,
 }
@@ -465,6 +476,17 @@ func setParams(ctx *cli.Context) error {
 		flagSet = true
 	}
 
+	if ctx.IsSet("easyautoloop") {
+		params.EasyAutoloop = ctx.Bool("easyautoloop")
+		flagSet = true
+	}
+
+	if ctx.IsSet("localbalancesat") {
+		params.EasyAutoloopLocalTargetSat =
+			ctx.Uint64("localbalancesat")
+		flagSet = true
+	}
+
 	if !flagSet {
 		return fmt.Errorf("at least one flag required to set params")
 	}

docs/autoloop.md

@@ -9,6 +9,24 @@ following command:
 loop setparams --autoloop=true
 ```
 
+## Easy Autoloop
+
+If you don't want to bother with setting up specific rules for each of your
+channels and peers you can use easy autoloop. This mode of autoloop requires
+for you to set only the overall channel balance that you don't wish to exceed
+on your lightning node. For example, if you want to keep your node's total
+channel balance below 1 million satoshis you can set the following
+```
+loop setparams --autoloop=true --easyautoloop=true --localbalancesat=1000000
+```
+
+This will automatically start dispatching loop-outs whenever you exceed total
+channel balance of 1M sats. Keep in mind that on first time use this will use
+the default budget parameters. If you wish to configure a custom budget you can
+find more info in the [Budget](#budget) section.
+
+## Liquidity Rules
+
 At present, autoloop can be configured to either acquire incoming liquidity 
 using loop out, or acquire outgoing liquidity using loop in. It cannot support
 automated swaps in both directions. To set the type of swaps you would like 

liquidity/autoloop_test.go

@@ -207,7 +207,7 @@ func TestAutoLoopEnabled(t *testing.T) {
 				Events: []*loopdb.LoopEvent{
 					{
 						SwapStateData: loopdb.SwapStateData{
-							State: loopdb.StateInitiated,
+							State: loopdb.StateSuccess,
 						},
 					},
 				},
@@ -472,7 +472,7 @@ func TestAutoloopAddress(t *testing.T) {
 				Events: []*loopdb.LoopEvent{
 					{
 						SwapStateData: loopdb.SwapStateData{
-							State: loopdb.StateHtlcPublished,
+							State: loopdb.StateSuccess,
 						},
 					},
 				},
@@ -647,7 +647,7 @@ func TestCompositeRules(t *testing.T) {
 				Events: []*loopdb.LoopEvent{
 					{
 						SwapStateData: loopdb.SwapStateData{
-							State: loopdb.StateHtlcPublished,
+							State: loopdb.StateSuccess,
 						},
 					},
 				},
@@ -984,7 +984,7 @@ func TestAutoloopBothTypes(t *testing.T) {
 				Events: []*loopdb.LoopEvent{
 					{
 						SwapStateData: loopdb.SwapStateData{
-							State: loopdb.StateHtlcPublished,
+							State: loopdb.SwapState(loopdb.StateSuccess),
 						},
 					},
 				},
@@ -1162,15 +1162,28 @@ func TestAutoLoopRecurringBudget(t *testing.T) {
 				},
 			},
 		}
+
+		singleLoopOut = &loopdb.LoopOut{
+			Loop: loopdb.Loop{
+				Events: []*loopdb.LoopEvent{
+					{
+						SwapStateData: loopdb.SwapStateData{
+							State: loopdb.SwapState(loopdb.StateSuccess),
+						},
+					},
+				},
+			},
+		}
 	)
 
 	// Tick our autolooper with no existing swaps, we expect a loop out
 	// swap to be dispatched on first channel.
 	step := &autoloopStep{
-		minAmt:      1,
-		maxAmt:      amt + 1,
-		quotesOut:   quotes1,
-		expectedOut: loopOuts1,
+		minAmt:            1,
+		maxAmt:            amt + 1,
+		quotesOut:         quotes1,
+		expectedOut:       loopOuts1,
+		existingOutSingle: singleLoopOut,
 	}
 	c.autoloop(step)
 
@@ -1188,11 +1201,12 @@ func TestAutoLoopRecurringBudget(t *testing.T) {
 	}
 
 	step = &autoloopStep{
-		minAmt:      1,
-		maxAmt:      amt + 1,
-		quotesOut:   quotes2,
-		existingOut: existing,
-		expectedOut: nil,
+		minAmt:            1,
+		maxAmt:            amt + 1,
+		quotesOut:         quotes2,
+		existingOut:       existing,
+		expectedOut:       nil,
+		existingOutSingle: singleLoopOut,
 	}
 	// Tick again, we should expect no loop outs because our budget would be
 	// exceeded.
@@ -1222,11 +1236,12 @@ func TestAutoLoopRecurringBudget(t *testing.T) {
 	c.testClock.SetTime(testTime.Add(time.Hour * 25))
 
 	step = &autoloopStep{
-		minAmt:      1,
-		maxAmt:      amt + 1,
-		quotesOut:   quotes2,
-		existingOut: existing2,
-		expectedOut: loopOuts2,
+		minAmt:            1,
+		maxAmt:            amt + 1,
+		quotesOut:         quotes2,
+		existingOut:       existing2,
+		expectedOut:       loopOuts2,
+		existingOutSingle: singleLoopOut,
 	}
 
 	// Tick again, we should expect a loop out to occur on the 2nd channel.
@@ -1235,6 +1250,177 @@ func TestAutoLoopRecurringBudget(t *testing.T) {
 	c.stop()
 }
 
+// TestEasyAutoloop tests that the easy autoloop logic works as expected. This
+// involves testing that channels are correctly selected and that the balance
+// target is successfully met.
+func TestEasyAutoloop(t *testing.T) {
+	defer test.Guard(t)
+
+	// We need to change the default channels we use for tests so that they
+	// have different local balances in order to know which one is going to
+	// be selected by easy autoloop.
+	easyChannel1 := lndclient.ChannelInfo{
+		Active:        true,
+		ChannelID:     chanID1.ToUint64(),
+		PubKeyBytes:   peer1,
+		LocalBalance:  95000,
+		RemoteBalance: 0,
+		Capacity:      100000,
+	}
+
+	easyChannel2 := lndclient.ChannelInfo{
+		Active:        true,
+		ChannelID:     chanID1.ToUint64(),
+		PubKeyBytes:   peer1,
+		LocalBalance:  75000,
+		RemoteBalance: 0,
+		Capacity:      100000,
+	}
+
+	var (
+		channels = []lndclient.ChannelInfo{
+			easyChannel1, easyChannel2,
+		}
+
+		params = Parameters{
+			Autoloop:                  true,
+			AutoFeeBudget:             36000,
+			AutoFeeRefreshPeriod:      time.Hour * 3,
+			AutoloopBudgetLastRefresh: testBudgetStart,
+			MaxAutoInFlight:           2,
+			FailureBackOff:            time.Hour,
+			SweepConfTarget:           10,
+			HtlcConfTarget:            defaultHtlcConfTarget,
+			EasyAutoloop:              true,
+			EasyAutoloopTarget:        75000,
+			FeeLimit:                  defaultFeePortion(),
+		}
+	)
+
+	c := newAutoloopTestCtx(t, params, channels, testRestrictions)
+	c.start()
+
+	var (
+		maxAmt = 50000
+
+		chan1Swap = &loop.OutRequest{
+			Amount:          btcutil.Amount(maxAmt),
+			OutgoingChanSet: loopdb.ChannelSet{easyChannel1.ChannelID},
+			Label:           labels.AutoloopLabel(swap.TypeOut),
+			Initiator:       autoloopSwapInitiator,
+		}
+
+		quotesOut1 = []quoteRequestResp{
+			{
+				request: &loop.LoopOutQuoteRequest{
+					Amount: btcutil.Amount(maxAmt),
+				},
+				quote: &loop.LoopOutQuote{
+					SwapFee:      1,
+					PrepayAmount: 1,
+					MinerFee:     1,
+				},
+			},
+		}
+
+		loopOut1 = []loopOutRequestResp{
+			{
+				request: chan1Swap,
+				response: &loop.LoopOutSwapInfo{
+					SwapHash: lntypes.Hash{1},
+				},
+			},
+		}
+	)
+
+	// We expected one max size swap to be dispatched on our channel with
+	// the biggest local balance.
+	step := &easyAutoloopStep{
+		minAmt:      1,
+		maxAmt:      50000,
+		quotesOut:   quotesOut1,
+		expectedOut: loopOut1,
+	}
+
+	c.easyautoloop(step, false)
+	c.stop()
+
+	// In order to reflect the change on the channel balances we create a
+	// new context and restart the autolooper.
+	easyChannel1.LocalBalance -= chan1Swap.Amount
+	channels = []lndclient.ChannelInfo{
+		easyChannel1, easyChannel2,
+	}
+
+	c = newAutoloopTestCtx(t, params, channels, testRestrictions)
+	c.start()
+
+	var (
+		amt2 = 45_000
+
+		chan2Swap = &loop.OutRequest{
+			Amount:          btcutil.Amount(amt2),
+			OutgoingChanSet: loopdb.ChannelSet{easyChannel2.ChannelID},
+			Label:           labels.AutoloopLabel(swap.TypeOut),
+			Initiator:       autoloopSwapInitiator,
+		}
+
+		quotesOut2 = []quoteRequestResp{
+			{
+				request: &loop.LoopOutQuoteRequest{
+					Amount: btcutil.Amount(amt2),
+				},
+				quote: &loop.LoopOutQuote{
+					SwapFee:      1,
+					PrepayAmount: 1,
+					MinerFee:     1,
+				},
+			},
+		}
+
+		loopOut2 = []loopOutRequestResp{
+			{
+				request: chan2Swap,
+				response: &loop.LoopOutSwapInfo{
+					SwapHash: lntypes.Hash{1},
+				},
+			},
+		}
+	)
+
+	// We expect a swap of size 45_000 to be dispatched in order to meet the
+	// defined target of 75_000.
+	step = &easyAutoloopStep{
+		minAmt:      1,
+		maxAmt:      50000,
+		quotesOut:   quotesOut2,
+		expectedOut: loopOut2,
+	}
+
+	c.easyautoloop(step, false)
+	c.stop()
+
+	// In order to reflect the change on the channel balances we create a
+	// new context and restart the autolooper.
+	easyChannel2.LocalBalance -= btcutil.Amount(amt2)
+	channels = []lndclient.ChannelInfo{
+		easyChannel1, easyChannel2,
+	}
+
+	c = newAutoloopTestCtx(t, params, channels, testRestrictions)
+	c.start()
+
+	// We have met the target of 75_000 so we don't expect any action from
+	// easy autoloop. That's why we set noop to true in the call below.
+	step = &easyAutoloopStep{
+		minAmt: 1,
+		maxAmt: 50000,
+	}
+
+	c.easyautoloop(step, true)
+	c.stop()
+}
+
 // existingSwapFromRequest is a helper function which returns the db
 // representation of a loop out request with the event set provided.
 func existingSwapFromRequest(request *loop.OutRequest, initTime time.Time,