add the ability to parse zebrad.toml config file

Fixes #462. If the file extension is .conf (as in zcash.conf), then
parse the file as an INI file. If the extension is .toml (as in
zebrad.toml), then interpret as TOML.

frontend/frontend_test.go

@@ -540,52 +540,6 @@ func TestSendTransaction(t *testing.T) {
 	step = 0
 }
 
-var sampleconf = `
-testnet = 1
-rpcport = 18232
-rpcbind = 127.0.0.1
-rpcuser = testlightwduser
-rpcpassword = testlightwdpassword
-`
-
-func TestNewZRPCFromConf(t *testing.T) {
-	connCfg, err := connFromConf([]byte(sampleconf))
-	if err != nil {
-		t.Fatal("connFromConf failed")
-	}
-	if connCfg.Host != "127.0.0.1:18232" {
-		t.Fatal("connFromConf returned unexpected Host")
-	}
-	if connCfg.User != "testlightwduser" {
-		t.Fatal("connFromConf returned unexpected User")
-	}
-	if connCfg.Pass != "testlightwdpassword" {
-		t.Fatal("connFromConf returned unexpected User")
-	}
-	if !connCfg.HTTPPostMode {
-		t.Fatal("connFromConf returned unexpected HTTPPostMode")
-	}
-	if !connCfg.DisableTLS {
-		t.Fatal("connFromConf returned unexpected DisableTLS")
-	}
-
-	// can't pass an integer
-	_, err = connFromConf(10)
-	if err == nil {
-		t.Fatal("connFromConf unexpected success")
-	}
-
-	// Can't verify returned values, but at least run it
-	_, err = NewZRPCFromConf([]byte(sampleconf))
-	if err != nil {
-		t.Fatal("NewZRPCFromClient failed")
-	}
-	_, err = NewZRPCFromConf(10)
-	if err == nil {
-		t.Fatal("NewZRPCFromClient unexpected success")
-	}
-}
-
 func TestMempoolFilter(t *testing.T) {
 	txidlist := []string{
 		"2e819d0bab5c819dc7d5f92d1bfb4127ce321daf847f6602",

frontend/rpc_client.go

@@ -8,14 +8,16 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"path/filepath"
 
+	"github.com/BurntSushi/toml"
 	"github.com/btcsuite/btcd/rpcclient"
 	"github.com/zcash/lightwalletd/common"
 	ini "gopkg.in/ini.v1"
 )
 
 // NewZRPCFromConf reads the zcashd configuration file.
-func NewZRPCFromConf(confPath interface{}) (*rpcclient.Client, error) {
+func NewZRPCFromConf(confPath string) (*rpcclient.Client, error) {
 	connCfg, err := connFromConf(confPath)
 	if err != nil {
 		return nil, err
@@ -36,12 +38,18 @@ func NewZRPCFromFlags(opts *common.Options) (*rpcclient.Client, error) {
 	return rpcclient.New(connCfg, nil)
 }
 
-// If passed a string, interpret as a path, open and read; if passed
-// a byte slice, interpret as the config file content (used in testing).
-func connFromConf(confPath interface{}) (*rpcclient.ConnConfig, error) {
+func connFromConf(confPath string) (*rpcclient.ConnConfig, error) {
+	if filepath.Ext(confPath) == ".toml" {
+		return connFromToml(confPath)
+	} else {
+		return connFromIni(confPath)
+	}
+}
+
+func connFromIni(confPath string) (*rpcclient.ConnConfig, error) {
 	cfg, err := ini.Load(confPath)
 	if err != nil {
-		return nil, fmt.Errorf("failed to read config file: %w", err)
+		return nil, fmt.Errorf("failed to read config file in .conf format: %w", err)
 	}
 
 	rpcaddr := cfg.Section("").Key("rpcbind").String()
@@ -76,3 +84,30 @@ func connFromConf(confPath interface{}) (*rpcclient.ConnConfig, error) {
 	// not supported in HTTP POST mode.
 	return connCfg, nil
 }
+
+// If passed a string, interpret as a path, open and read; if passed
+// a byte slice, interpret as the config file content (used in testing).
+func connFromToml(confPath string) (*rpcclient.ConnConfig, error) {
+	var tomlConf struct {
+		Rpc struct {
+			Listen_addr string
+			RPCUser     string
+			RPCPassword string
+		}
+	}
+	_, err := toml.DecodeFile(confPath, &tomlConf)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read config file in .toml format: %w", err)
+	}
+	conf := rpcclient.ConnConfig{
+		Host:         tomlConf.Rpc.Listen_addr,
+		User:         tomlConf.Rpc.RPCUser,
+		Pass:         tomlConf.Rpc.RPCPassword,
+		HTTPPostMode: true, // Zcash only supports HTTP POST mode
+		DisableTLS:   true, // Zcash does not provide TLS by default
+	}
+
+	// Notice the notification parameter is nil since notifications are
+	// not supported in HTTP POST mode.
+	return &conf, nil
+}

go.mod

@@ -3,6 +3,7 @@ module github.com/zcash/lightwalletd
 go 1.17
 
 require (
+	github.com/BurntSushi/toml v0.3.1
 	github.com/btcsuite/btcd v0.24.0
 	github.com/golang/protobuf v1.5.3
 	github.com/grpc-ecosystem/go-grpc-middleware v1.4.0

go.sum

@@ -1136,6 +1136,7 @@ cloud.google.com/go/workflows v1.12.3/go.mod h1:fmOUeeqEwPzIU81foMjTRQIdwQHADi/v
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
 git.sr.ht/~sbinet/gg v0.3.1/go.mod h1:KGYtlADtqsqANL9ueOFkWymvzUvLMQllU5Ixo+8v3pc=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=