Add configuration file

config/config.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"gopkg.in/yaml.v2"
+	"io/ioutil"
+)
+
+type Config struct {
+	Services []Service `yaml:"services"`
+}
+
+type Service struct {
+	Name             string      `yaml:"name"`
+	Url              string      `yaml:"url"`
+	Interval         uint        `yaml:"interval"`
+	FailureThreshold uint        `yaml:"failure-threshold"`
+	Conditions       []Condition `yaml:"conditions"`
+}
+
+type Condition string
+
+var config *Config
+
+func Get() *Config {
+	if config == nil {
+		ReadConfigurationFile("config.yaml")
+	}
+	return config
+}
+
+func ReadConfigurationFile(fileName string) *Config {
+	config = &Config{}
+	if bytes, err := ioutil.ReadFile(fileName); err == nil { // file exists
+		return ParseConfigBytes(bytes)
+	} else {
+		panic(err)
+	}
+	return config
+}
+
+func ParseConfigBytes(yamlBytes []byte) *Config {
+	config = &Config{}
+	yaml.Unmarshal(yamlBytes, config)
+	return config
+}