add multi instance support

config.go

@@ -1,29 +1,72 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"log"
+	"regexp"
 	"strings"
 
 	"github.com/pyke369/golang-support/uconfig"
 )
 
+func getPDNSInstances(config *uconfig.UConfig) ([]pdnsInstance, error) {
+	var err error
+	instances := []pdnsInstance{}
+	hasDefaultInstance := false
+	i := pdnsInstance{}
+	for _, profile := range config.GetPaths("config.pdns") {
+		if i.dns, err = NewClient(
+			config.GetString(profile+".api-url", "http://127.0.0.1:8081/api/v1/servers/localhost"),
+			config.GetString(profile+".api-key", ""),
+			int(config.GetInteger(profile+".timeout", 3)),
+			int(config.GetInteger(profile+".defaultTTL", 3600))); err != nil {
+			return nil, err
+		}
+		i.isDefault = config.GetBoolean(profile+".default", false)
+		if i.isDefault && hasDefaultInstance {
+			return nil, errors.New("There can be only one default instance")
+		} else {
+			hasDefaultInstance = true
+		}
+
+		for _, r := range parseConfigArray(config, profile+".whenRegexp") {
+			re, err := regexp.Compile(r)
+			if err != nil {
+				return nil, err
+			}
+			i.regexp = append(i.regexp, re)
+		}
+		instances = append(instances, i)
+	}
+	if len(instances) == 0 {
+		return nil, errors.New("There must be at least one instance")
+	}
+	if len(instances) > 1 && !hasDefaultInstance {
+		return nil, errors.New("There must be at least one default instance")
+	}
+	return instances, nil
+}
+
 func loadConfig(configFile string) (*HTTPServer, error) {
 	// Parse the configuration file
 	config, err := uconfig.New(configFile)
 	if err != nil {
 		return nil, err
 	}
+
+	instances, err := getPDNSInstances(config)
+	if err != nil {
+		return nil, err
+	}
+
 	h := NewHTTPServer(
 		config.GetString("config.http.port", "127.0.0.01:8080"),
 		config.GetString("config.http.key", ""),
 		config.GetString("config.http.cert", ""),
 		config.GetString("config.http.crl", ""),
 		config.GetString("config.http.ca", ""),
-		config.GetString("config.pdns.api-url", "http://127.0.0.1:8081/api/v1/servers/localhost"),
-		config.GetString("config.pdns.api-key", ""),
-		int(config.GetInteger("config.pdns.timeout", 3)),
-		int(config.GetInteger("config.pdns.defaultTTL", 3600)),
+		instances,
 	)
 	populateHTTPServerZoneProfiles(config, h)
 	populateHTTPServerAcls(config, h)