started working on JSON-RPC integration

* still WIP

src/utils/config.go

@@ -0,0 +1,80 @@
+package utils
+
+import (
+	"io/ioutil"
+	"errors"
+	"gopkg.in/yaml.v2"
+)
+
+type ConfigEntry struct {
+	TcpPort int64 `yaml:"tcp_port"`
+	FifoPathname string `yaml:"fifo_pathname"`
+}
+
+type Config struct {
+    Entries map[string]ConfigEntry `yaml:"config,omitempty"`
+}
+
+type JsonRpc2ClientConfig struct {
+	config Config
+}
+
+func NewJsonRpc2ClientConfig() *JsonRpc2ClientConfig {
+	return &JsonRpc2ClientConfig{
+	}
+}
+
+func (c *JsonRpc2ClientConfig) Load(path string) error {
+	data, err := ioutil.ReadFile(path)
+	if err != nil {
+		return err
+	}
+
+	err = yaml.Unmarshal(data, &c.config)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *JsonRpc2ClientConfig) GetTcpPortForNumber(number string) (int64, error) {
+	if val, ok := c.config.Entries[number]; ok {
+		return val.TcpPort, nil
+	}
+
+	return 0, errors.New("No number found")
+}
+
+func (c *JsonRpc2ClientConfig) GetFifoPathnameForNumber(number string) (string, error) {
+	if val, ok := c.config.Entries[number]; ok {
+		return val.FifoPathname, nil
+	}
+
+	return "", errors.New("No number found")
+}
+
+func (c *JsonRpc2ClientConfig) GetTcpPortsForNumbers() map[string]int64 {
+	mapping := make(map[string]int64)
+	for number, val := range c.config.Entries {
+		mapping[number] = val.TcpPort
+	}
+
+	return mapping
+}
+
+func (c *JsonRpc2ClientConfig) AddEntry(number string, configEntry ConfigEntry) {
+	if c.config.Entries == nil {
+		c.config.Entries = make(map[string]ConfigEntry)
+	}
+	c.config.Entries[number] = configEntry
+}
+
+func (c *JsonRpc2ClientConfig) Persist(path string) error {
+	out, err := yaml.Marshal(&c.config)
+	if err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(path, out, 0644)
+}