lnd.xprv/mobile/bindings.go
Johan T. Halseth 7a30332619
mobile: use single "mobile" build tag instead of "ios" and "android"
Since the "android" build tag conflicts with a go compiler build tag, we instead use a single "mobile" tag for both platforms.
2020-07-17 08:49:02 +02:00

131 lines
3.5 KiB
Go

// +build mobile
package lndmobile
import (
"fmt"
"os"
"strings"
flags "github.com/jessevdk/go-flags"
"github.com/lightningnetwork/lnd"
"github.com/lightningnetwork/lnd/signal"
)
// Start starts lnd in a new goroutine.
//
// extraArgs can be used to pass command line arguments to lnd that will
// override what is found in the config file. Example:
// extraArgs = "--bitcoin.testnet --lnddir=\"/tmp/folder name/\" --profile=5050"
//
// The unlockerReady callback is called when the WalletUnlocker service is
// ready, and rpcReady is called after the wallet has been unlocked and lnd is
// ready to accept RPC calls.
//
// NOTE: On mobile platforms the '--lnddir` argument should be set to the
// current app directory in order to ensure lnd has the permissions needed to
// write to it.
func Start(extraArgs string, unlockerReady, rpcReady Callback) {
// Split the argument string on "--" to get separated command line
// arguments.
var splitArgs []string
for _, a := range strings.Split(extraArgs, "--") {
// Trim any whitespace space, and ignore empty params.
a := strings.TrimSpace(a)
if a == "" {
continue
}
// Finally we prefix any non-empty string with -- to mimic the
// regular command line arguments.
splitArgs = append(splitArgs, "--"+a)
}
// Add the extra arguments to os.Args, as that will be parsed in
// LoadConfig below.
os.Args = append(os.Args, splitArgs...)
// Load the configuration, and parse the extra arguments as command
// line options. This function will also set up logging properly.
loadedConfig, err := lnd.LoadConfig()
if err != nil {
_, _ = fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
// Hook interceptor for os signals.
signal.Intercept()
// Set up channels that will be notified when the RPC servers are ready
// to accept calls.
var (
unlockerListening = make(chan struct{})
rpcListening = make(chan struct{})
)
// We call the main method with the custom in-memory listeners called
// by the mobile APIs, such that the grpc server will use these.
cfg := lnd.ListenerCfg{
WalletUnlocker: &lnd.ListenerWithSignal{
Listener: walletUnlockerLis,
Ready: unlockerListening,
},
RPCListener: &lnd.ListenerWithSignal{
Listener: lightningLis,
Ready: rpcListening,
},
}
// Call the "real" main in a nested manner so the defers will properly
// be executed in the case of a graceful shutdown.
go func() {
if err := lnd.Main(
loadedConfig, cfg, signal.ShutdownChannel(),
); err != nil {
if e, ok := err.(*flags.Error); ok &&
e.Type == flags.ErrHelp {
} else {
fmt.Fprintln(os.Stderr, err)
}
os.Exit(1)
}
}()
// Finally we start two go routines that will call the provided
// callbacks when the RPC servers are ready to accept calls.
go func() {
<-unlockerListening
// We must set the TLS certificates in order to properly
// authenticate with the wallet unlocker service.
auth, err := lnd.WalletUnlockerAuthOptions(loadedConfig)
if err != nil {
unlockerReady.OnError(err)
return
}
// Add the auth options to the listener's dial options.
addWalletUnlockerLisDialOption(auth...)
unlockerReady.OnResponse([]byte{})
}()
go func() {
<-rpcListening
// Now that the RPC server is ready, we can get the needed
// authentication options, and add them to the global dial
// options.
auth, err := lnd.AdminAuthOptions(loadedConfig)
if err != nil {
rpcReady.OnError(err)
return
}
// Add the auth options to the listener's dial options.
addLightningLisDialOption(auth...)
rpcReady.OnResponse([]byte{})
}()
}