mirror of https://github.com/lightninglabs/loop
lndclient: add NewBasicClient function
parent
f1f72bb2d1
commit
52dbc03dda
@ -0,0 +1,71 @@
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package lndclient
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import (
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"fmt"
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"io/ioutil"
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"path/filepath"
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"github.com/lightningnetwork/lnd/lncfg"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/macaroons"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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macaroon "gopkg.in/macaroon.v2"
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)
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// NewBasicClient creates a new basic gRPC client to lnd. We call this client
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// "basic" as it uses a global macaroon (by default the admin macaroon) for the
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// entire connection, and falls back to expected defaults if the arguments
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// aren't provided.
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func NewBasicClient(lndHost, tlsPath, macPath, network string) (lnrpc.LightningClient, error) {
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if tlsPath == "" {
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tlsPath = defaultTLSCertPath
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}
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// Load the specified TLS certificate and build transport credentials
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creds, err := credentials.NewClientTLSFromFile(tlsPath, "")
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if err != nil {
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return nil, err
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}
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// Create a dial options array.
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opts := []grpc.DialOption{
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grpc.WithTransportCredentials(creds),
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}
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if macPath == "" {
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macPath = filepath.Join(
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defaultLndDir, defaultDataDir, defaultChainSubDir,
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"bitcoin", network, defaultAdminMacaroonFilename,
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)
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}
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// Load the specified macaroon file.
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macBytes, err := ioutil.ReadFile(macPath)
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if err == nil {
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// Only if file is found
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mac := &macaroon.Macaroon{}
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if err = mac.UnmarshalBinary(macBytes); err != nil {
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return nil, fmt.Errorf("unable to decode macaroon: %v",
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err)
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}
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// Now we append the macaroon credentials to the dial options.
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cred := macaroons.NewMacaroonCredential(mac)
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opts = append(opts, grpc.WithPerRPCCredentials(cred))
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}
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// We need to use a custom dialer so we can also connect to unix sockets
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// and not just TCP addresses.
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opts = append(
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opts, grpc.WithDialer(
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lncfg.ClientAddressDialer(defaultRPCPort),
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),
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)
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conn, err := grpc.Dial(lndHost, opts...)
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if err != nil {
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return nil, fmt.Errorf("unable to connect to RPC server: %v", err)
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}
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return lnrpc.NewLightningClient(conn), nil
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}
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