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root.go
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package lcd
import (
"errors"
"fmt"
"net"
"net/http"
"os"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/context"
"github.com/cosmos/cosmos-sdk/client/keys"
"github.com/cosmos/cosmos-sdk/codec"
keybase "github.com/cosmos/cosmos-sdk/crypto/keys"
"github.com/cosmos/cosmos-sdk/server"
"github.com/gorilla/mux"
"github.com/rakyll/statik/fs"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"github.com/tendermint/tendermint/libs/log"
rpcserver "github.com/tendermint/tendermint/rpc/lib/server"
// Import statik for light client stuff
_ "github.com/cosmos/cosmos-sdk/client/lcd/statik"
)
// RestServer represents the Light Client Rest server
type RestServer struct {
Mux *mux.Router
CliCtx context.CLIContext
KeyBase keybase.Keybase
Cdc *codec.Codec
log log.Logger
listener net.Listener
fingerprint string
}
// NewRestServer creates a new rest server instance
func NewRestServer(cdc *codec.Codec) *RestServer {
r := mux.NewRouter()
cliCtx := context.NewCLIContext().WithCodec(cdc)
// Register version methods on the router
r.HandleFunc("/version", CLIVersionRequestHandler).Methods("GET")
r.HandleFunc("/node_version", NodeVersionRequestHandler(cliCtx)).Methods("GET")
logger := log.NewTMLogger(log.NewSyncWriter(os.Stdout)).With("module", "rest-server")
return &RestServer{
Mux: r,
CliCtx: cliCtx,
Cdc: cdc,
log: logger,
}
}
func (rs *RestServer) setKeybase(kb keybase.Keybase) {
// If a keybase is passed in, set it and return
if kb != nil {
rs.KeyBase = kb
return
}
// Otherwise get the keybase and set it
kb, err := keys.GetKeyBase() //XXX
if err != nil {
fmt.Printf("Failed to open Keybase: %s, exiting...", err)
os.Exit(1)
}
rs.KeyBase = kb
}
// Start starts the rest server
func (rs *RestServer) Start(listenAddr string, sslHosts string,
certFile string, keyFile string, maxOpen int, insecure bool) (err error) {
server.TrapSignal(func() {
err := rs.listener.Close()
rs.log.Error("error closing listener", "err", err)
})
// TODO: re-enable insecure mode once #2715 has been addressed
if insecure {
fmt.Println(
"Insecure mode is temporarily disabled, please locally generate an " +
"SSL certificate to test. Support will be re-enabled soon!",
)
// listener, err = rpcserver.StartHTTPServer(
// listenAddr, handler, logger,
// rpcserver.Config{MaxOpenConnections: maxOpen},
// )
// if err != nil {
// return
// }
} else {
if certFile != "" {
// validateCertKeyFiles() is needed to work around tendermint/tendermint#2460
err = validateCertKeyFiles(certFile, keyFile)
if err != nil {
return err
}
// cert/key pair is provided, read the fingerprint
rs.fingerprint, err = fingerprintFromFile(certFile)
if err != nil {
return err
}
} else {
// if certificate is not supplied, generate a self-signed one
certFile, keyFile, rs.fingerprint, err = genCertKeyFilesAndReturnFingerprint(sslHosts)
if err != nil {
return err
}
defer func() {
os.Remove(certFile)
os.Remove(keyFile)
}()
}
rs.listener, err = rpcserver.Listen(
listenAddr,
rpcserver.Config{MaxOpenConnections: maxOpen},
)
if err != nil {
return
}
rs.log.Info("Starting Gaia Lite REST service...")
rs.log.Info(rs.fingerprint)
err := rpcserver.StartHTTPAndTLSServer(
rs.listener,
rs.Mux,
certFile, keyFile,
rs.log,
)
if err != nil {
return err
}
}
return nil
}
// ServeCommand will start a Gaia Lite REST service as a blocking process. It
// takes a codec to create a RestServer object and a function to register all
// necessary routes.
func ServeCommand(cdc *codec.Codec, registerRoutesFn func(*RestServer)) *cobra.Command {
cmd := &cobra.Command{
Use: "rest-server",
Short: "Start LCD (light-client daemon), a local REST server",
RunE: func(cmd *cobra.Command, args []string) (err error) {
rs := NewRestServer(cdc)
rs.setKeybase(nil)
registerRoutesFn(rs)
// Start the rest server and return error if one exists
err = rs.Start(
viper.GetString(client.FlagListenAddr),
viper.GetString(client.FlagSSLHosts),
viper.GetString(client.FlagSSLCertFile),
viper.GetString(client.FlagSSLKeyFile),
viper.GetInt(client.FlagMaxOpenConnections),
viper.GetBool(client.FlagInsecure))
return err
},
}
client.RegisterRestServerFlags(cmd)
return cmd
}
func (rs *RestServer) registerSwaggerUI() {
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 validateCertKeyFiles(certFile, keyFile string) error {
if keyFile == "" {
return errors.New("a key file is required")
}
if _, err := os.Stat(certFile); err != nil {
return err
}
if _, err := os.Stat(keyFile); err != nil {
return err
}
return nil
}