Expose LCD router, allowing devs to register custom routes from their modules (#2836)

* Fixes #1081

cmd/gaia/cmd/gaiacli/main.go

@@ -1,9 +1,11 @@
 package main
 
 import (
+	"net/http"
 	"os"
 	"path"
 
+	"github.com/rakyll/statik/fs"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
@@ -13,9 +15,15 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/keys"
 	"github.com/cosmos/cosmos-sdk/client/lcd"
 	"github.com/cosmos/cosmos-sdk/client/rpc"
+	"github.com/cosmos/cosmos-sdk/client/tx"
 	"github.com/cosmos/cosmos-sdk/cmd/gaia/app"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/version"
+	auth "github.com/cosmos/cosmos-sdk/x/auth/client/rest"
+	bank "github.com/cosmos/cosmos-sdk/x/bank/client/rest"
+	gov "github.com/cosmos/cosmos-sdk/x/gov/client/rest"
+	slashing "github.com/cosmos/cosmos-sdk/x/slashing/client/rest"
+	stake "github.com/cosmos/cosmos-sdk/x/stake/client/rest"
 
 	_ "github.com/cosmos/cosmos-sdk/client/lcd/statik"
 )
@@ -37,15 +45,25 @@ var (
 )
 
 func main() {
+	// Configure cobra to sort commands
 	cobra.EnableCommandSorting = false
+
+	// Instantiate the codec for the command line application
 	cdc := app.MakeCodec()
 
+	// Read in the configuration file for the sdk
 	config := sdk.GetConfig()
 	config.SetBech32PrefixForAccount(sdk.Bech32PrefixAccAddr, sdk.Bech32PrefixAccPub)
 	config.SetBech32PrefixForValidator(sdk.Bech32PrefixValAddr, sdk.Bech32PrefixValPub)
 	config.SetBech32PrefixForConsensusNode(sdk.Bech32PrefixConsAddr, sdk.Bech32PrefixConsPub)
 	config.Seal()
 
+	// Create a new RestServer instance to serve the light client routes
+	rs := lcd.NewRestServer(cdc)
+
+	// registerRoutes registers the routes on the rest server
+	registerRoutes(rs)
+
 	// TODO: setup keybase, viper object, etc. to be passed into
 	// the below functions and eliminate global vars, like we do
 	// with the cdc
@@ -58,7 +76,7 @@ func main() {
 		queryCmd(cdc),
 		txCmd(cdc),
 		client.LineBreak,
-		lcd.ServeCommand(cdc),
+		rs.ServeCommand(),
 		client.LineBreak,
 		keys.Commands(),
 		client.LineBreak,
@@ -79,6 +97,30 @@ func main() {
 	}
 }
 
+// registerRoutes registers the routes from the different modules for the LCD.
+// NOTE: details on the routes added for each module are in the module documentation
+// NOTE: If making updates here you also need to update the test helper in client/lcd/test_helper.go
+func registerRoutes(rs *lcd.RestServer) {
+	registerSwaggerUI(rs)
+	keys.RegisterRoutes(rs.Mux, rs.CliCtx.Indent)
+	rpc.RegisterRoutes(rs.CliCtx, rs.Mux)
+	tx.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc)
+	auth.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc, "acc")
+	bank.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc, rs.KeyBase)
+	stake.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc, rs.KeyBase)
+	slashing.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc, rs.KeyBase)
+	gov.RegisterRoutes(rs.CliCtx, rs.Mux, rs.Cdc)
+}
+
+func registerSwaggerUI(rs *lcd.RestServer) {
+	statikFS, err := fs.New()
+	if err != nil {
+		panic(err)
+	}
+	staticServer := http.FileServer(statikFS)
+	rs.Mux.PathPrefix("/swagger-ui/").Handler(http.StripPrefix("/swagger-ui/", staticServer))
+}
+
 func initConfig(cmd *cobra.Command) error {
 	home, err := cmd.PersistentFlags().GetString(cli.HomeFlag)
 	if err != nil {