Load config from disk|url, create incidents

- Resolve incidents after the monitor is up
- Example configuration
- Updated readme

cachet/config.go

@@ -0,0 +1,74 @@
+package cachet
+
+import (
+	"os"
+	"fmt"
+	"flag"
+	"net/url"
+	"net/http"
+	"io/ioutil"
+	"encoding/json"
+)
+
+var Config CachetConfig
+
+type CachetConfig struct {
+	API_Url string `json:"api_url"`
+	API_Token string `json:"api_token"`
+	Monitors []*Monitor `json:"monitors"`
+}
+
+func init() {
+	var configPath string
+	flag.StringVar(&configPath, "c", "/etc/cachet-monitor.config.json", "Config path")
+	flag.Parse()
+
+	var data []byte
+
+	// test if its a url
+	_, err := url.ParseRequestURI(configPath)
+	if err == nil {
+		// download config
+		response, err := http.Get(configPath)
+		if err != nil {
+			fmt.Printf("Cannot download network config: %v\n", err)
+			os.Exit(1)
+		}
+
+		defer response.Body.Close()
+
+		data, _ = ioutil.ReadAll(response.Body)
+
+		fmt.Println("Downloaded network configuration.")
+	} else {
+		data, err = ioutil.ReadFile(configPath)
+		if err != nil {
+			fmt.Println("Config file '" + configPath + "' missing!")
+			os.Exit(1)
+		}
+	}
+
+	err = json.Unmarshal(data, &Config)
+
+	if err != nil {
+		fmt.Println("Cannot parse config!")
+		os.Exit(1)
+	}
+
+	if len(os.Getenv("CACHET_API")) > 0 {
+		Config.API_Url = os.Getenv("CACHET_API")
+	}
+	if len(os.Getenv("CACHET_TOKEN")) > 0 {
+		Config.API_Token = os.Getenv("CACHET_TOKEN")
+	}
+
+	if len(Config.API_Token) == 0 || len(Config.API_Url) == 0 {
+		fmt.Printf("API URL or API Token not set. cachet-monitor won't be able to report incidents.\n\nPlease set:\n CACHET_API and CACHET_TOKEN environment variable to override settings.\n\nGet help at https://github.com/CastawayLabs/cachet-monitor\n")
+		os.Exit(1)
+	}
+
+	if len(Config.Monitors) == 0 {
+		fmt.Printf("No monitors defined!\nSee sample configuration: https://github.com/CastawayLabs/cachet-monitor/blob/master/example.config.json\n")
+		os.Exit(1)
+	}
+}