liquidity: add loopin to autoloop

cmd/loop/liquidity.go

@@ -48,6 +48,14 @@ var setLiquidityRuleCommand = cli.Command{
 	Description: "Update or remove the liquidity rule for a channel/peer.",
 	ArgsUsage:   "{shortchanid |  peerpubkey}",
 	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name: "type",
+			Usage: "the type of swap to perform, set to 'out' " +
+				"for acquiring inbound liquidity or 'in' for " +
+				"acquiring outbound liquidity.",
+			Value: "out",
+		},
+
 		cli.IntFlag{
 			Name: "incoming_threshold",
 			Usage: "the minimum percentage of incoming liquidity " +
@@ -168,7 +176,18 @@ func setRule(ctx *cli.Context) error {
 	newRule := &looprpc.LiquidityRule{
 		ChannelId: chanID,
 		Type:      looprpc.LiquidityRuleType_THRESHOLD,
-		SwapType:  looprpc.SwapType_LOOP_OUT,
+	}
+	if ctx.IsSet("type") {
+		switch ctx.String("type") {
+		case "in":
+			newRule.SwapType = looprpc.SwapType_LOOP_IN
+
+		case "out":
+			newRule.SwapType = looprpc.SwapType_LOOP_OUT
+
+		default:
+			return errors.New("please set type to in or out")
+		}
 	}
 
 	if pubkeyRule {
@@ -292,6 +311,11 @@ var setParamsCommand = cli.Command{
 			Usage: "the maximum amount in satoshis that the " +
 				"autoloop client will dispatch per-swap",
 		},
+		cli.IntFlag{
+			Name: "htlc_conf",
+			Usage: "the confirmation target for loop in on-chain " +
+				"htlcs",
+		},
 	},
 	Action: setParams,
 }
@@ -422,6 +446,11 @@ func setParams(ctx *cli.Context) error {
 		flagSet = true
 	}
 
+	if ctx.IsSet("htlc_conf") {
+		params.HtlcConfTarget = int32(ctx.Int("htlc_conf"))
+		flagSet = true
+	}
+
 	if !flagSet {
 		return fmt.Errorf("at least one flag required to set params")
 	}

docs/autoloop.md

@@ -9,6 +9,16 @@ following command:
 loop setparams --autoloop=true
 ```
 
+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 
+to automatically dispatch, use:
+```
+loop setparams --type={in|out}
+```
+
+Autoloop will perform loop out swaps *by default*.
+
 Swaps that are dispatched by the autolooper can be identified in the output of 
 `ListSwaps` by their label field, which will contain: `[reserved]: autoloop-out`.
 
@@ -286,7 +296,9 @@ following reasons will be displayed:
 * Fee insufficient: if the fees that a swap will cost are more than the
   percentage of total swap amount that we allow, this reason will be displayed.
   See [fees](#fees) to update this value.
-
+* Loop in unreachable: if the client node is unreachable by the server 
+  off-chain, this reason will be displayed. Try improving the connectivity of
+  your node so that it is reachable by the loop server.
 
 Further details for all of these reasons can be found in loopd's debug level 
 logs.