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// Package rpc contains wrapper around RPC client ONLY for internal usage.
// Should be in sync with the RPC plugin
package rpc
import (
"errors"
"fmt"
"net"
"net/rpc"
"os"
"strings"
goridgeRpc "github.com/roadrunner-server/goridge/v3/pkg/rpc"
rpcPlugin "github.com/roadrunner-server/rpc/v2"
"github.com/spf13/viper"
)
const (
prefix string = "rr"
rpcKey string = "rpc.listen"
)
// NewClient creates client ONLY for internal usage (communication between our application with RR side).
// Client will be connected to the RPC.
func NewClient(cfg string, flags []string) (*rpc.Client, error) {
v := viper.New()
v.AutomaticEnv()
v.SetEnvPrefix(prefix)
v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
v.SetConfigFile(cfg)
err := v.ReadInConfig()
if err != nil {
return nil, err
}
// automatically inject ENV variables using ${ENV} pattern
for _, key := range v.AllKeys() {
val := v.Get(key)
if s, ok := val.(string); ok {
v.Set(key, os.ExpandEnv(s))
}
}
// override config Flags
if len(flags) > 0 {
for _, f := range flags {
key, val, errP := parseFlag(f)
if errP != nil {
return nil, errP
}
v.Set(key, val)
}
}
// rpc.listen might be set by the -o flags or env variable
if !v.IsSet(rpcPlugin.PluginName) {
return nil, errors.New("rpc service not specified in the configuration. Tip: add\n rpc:\n\r listen: rr_rpc_address")
}
conn, err := Dialer(v.GetString(rpcKey))
if err != nil {
return nil, err
}
return rpc.NewClientWithCodec(goridgeRpc.NewClientCodec(conn)), nil
}
// Dialer creates rpc socket Dialer.
func Dialer(addr string) (net.Conn, error) {
dsn := strings.Split(addr, "://")
if len(dsn) != 2 {
return nil, errors.New("invalid socket DSN (tcp://:6001, unix://file.sock)")
}
return net.Dial(dsn[0], dsn[1])
}
func parseFlag(flag string) (string, string, error) {
if !strings.Contains(flag, "=") {
return "", "", fmt.Errorf("invalid flag `%s`", flag)
}
parts := strings.SplitN(strings.TrimLeft(flag, " \"'`"), "=", 2)
if len(parts) < 2 {
return "", "", errors.New("usage: -o key=value")
}
if parts[0] == "" {
return "", "", errors.New("key should not be empty")
}
if parts[1] == "" {
return "", "", errors.New("value should not be empty")
}
return strings.Trim(parts[0], " \n\t"), parseValue(strings.Trim(parts[1], " \n\t")), nil
}
func parseValue(value string) string {
escape := []rune(value)[0]
if escape == '"' || escape == '\'' || escape == '`' {
value = strings.Trim(value, string(escape))
value = strings.ReplaceAll(value, fmt.Sprintf("\\%s", string(escape)), string(escape))
}
return value
}
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