56230f5de2
On both Android and iOS (when not using a simulator) the application procees doesn't have write permissions to the default lnd directory. This commit adds a note about using the app directory given by the used platform.
114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
// +build ios android
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package lndmobile
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import (
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"fmt"
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"os"
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"strings"
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flags "github.com/jessevdk/go-flags"
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"github.com/lightningnetwork/lnd"
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)
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// Start starts lnd in a new goroutine.
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//
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// extraArgs can be used to pass command line arguments to lnd that will
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// override what is found in the config file. Example:
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// extraArgs = "--bitcoin.testnet --lnddir=\"/tmp/folder name/\" --profile=5050"
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//
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// The unlockerReady callback is called when the WalletUnlocker service is
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// ready, and rpcReady is called after the wallet has been unlocked and lnd is
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// ready to accept RPC calls.
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//
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// NOTE: On mobile platforms the '--lnddir` argument should be set to the
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// current app directory in order to ensure lnd has the permissions needed to
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// write to it.
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func Start(extraArgs string, unlockerReady, rpcReady Callback) {
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// Split the argument string on "--" to get separated command line
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// arguments.
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var splitArgs []string
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for _, a := range strings.Split(extraArgs, "--") {
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if a == "" {
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continue
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}
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// Finally we prefix any non-empty string with --, and trim
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// whitespace to mimic the regular command line arguments.
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splitArgs = append(splitArgs, strings.TrimSpace("--"+a))
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}
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// Add the extra arguments to os.Args, as that will be parsed during
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// startup.
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os.Args = append(os.Args, splitArgs...)
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// Set up channels that will be notified when the RPC servers are ready
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// to accept calls.
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var (
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unlockerListening = make(chan struct{})
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rpcListening = make(chan struct{})
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)
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// We call the main method with the custom in-memory listeners called
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// by the mobile APIs, such that the grpc server will use these.
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cfg := lnd.ListenerCfg{
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WalletUnlocker: &lnd.ListenerWithSignal{
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Listener: walletUnlockerLis,
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Ready: unlockerListening,
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},
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RPCListener: &lnd.ListenerWithSignal{
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Listener: lightningLis,
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Ready: rpcListening,
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},
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}
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// Call the "real" main in a nested manner so the defers will properly
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// be executed in the case of a graceful shutdown.
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go func() {
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if err := lnd.Main(cfg); err != nil {
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if e, ok := err.(*flags.Error); ok &&
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e.Type == flags.ErrHelp {
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} else {
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fmt.Fprintln(os.Stderr, err)
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}
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os.Exit(1)
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}
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}()
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// Finally we start two go routines that will call the provided
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// callbacks when the RPC servers are ready to accept calls.
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go func() {
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<-unlockerListening
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// We must set the TLS certificates in order to properly
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// authenticate with the wallet unlocker service.
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auth, err := lnd.WalletUnlockerAuthOptions()
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if err != nil {
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unlockerReady.OnError(err)
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return
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}
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// Add the auth options to the listener's dial options.
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addWalletUnlockerLisDialOption(auth...)
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unlockerReady.OnResponse([]byte{})
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}()
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go func() {
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<-rpcListening
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// Now that the RPC server is ready, we can get the needed
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// authentication options, and add them to the global dial
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// options.
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auth, err := lnd.AdminAuthOptions()
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if err != nil {
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rpcReady.OnError(err)
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return
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}
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// Add the auth options to the listener's dial options.
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addLightningLisDialOption(auth...)
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rpcReady.OnResponse([]byte{})
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}()
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}
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