config: move config.go out of config/

closes #423

pkg/config/config.go

@@ -0,0 +1,58 @@
+package config
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/go-yaml/yaml"
+	"github.com/pkg/errors"
+)
+
+const userAgentFormat = "/NEO-GO:%s/"
+
+// Version the version of the node, set at build time.
+var Version string
+
+// Config top level struct representing the config
+// for the node.
+type Config struct {
+	ProtocolConfiguration    ProtocolConfiguration    `yaml:"ProtocolConfiguration"`
+	ApplicationConfiguration ApplicationConfiguration `yaml:"ApplicationConfiguration"`
+}
+
+// GenerateUserAgent creates user agent string based on build time environment.
+func (c Config) GenerateUserAgent() string {
+	return fmt.Sprintf(userAgentFormat, Version)
+}
+
+// Load attempts to load the config from the given
+// path for the given netMode.
+func Load(path string, netMode NetMode) (Config, error) {
+	configPath := fmt.Sprintf("%s/protocol.%s.yml", path, netMode)
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		return Config{}, errors.Wrap(err, "Unable to load config")
+	}
+
+	configData, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		return Config{}, errors.Wrap(err, "Unable to read config")
+	}
+
+	config := Config{
+		ProtocolConfiguration: ProtocolConfiguration{
+			SystemFee: SystemFee{},
+		},
+		ApplicationConfiguration: ApplicationConfiguration{
+			PingInterval: 30,
+			PingTimeout:  90,
+		},
+	}
+
+	err = yaml.Unmarshal(configData, &config)
+	if err != nil {
+		return Config{}, errors.Wrap(err, "Problem unmarshaling config json data")
+	}
+
+	return config, nil
+}