config: add helper functions to handle config file

Signed-off-by: FUJITA Tomonori <[email protected]>

config/serve.go

@@ -0,0 +1,59 @@
+package config
+
+import (
+	"github.com/BurntSushi/toml"
+)
+
+func ReadConfigfileServe(path string, configCh chan BgpType, reloadCh chan bool) {
+	for {
+		<-reloadCh
+
+		b := BgpType{}
+		_, err := toml.DecodeFile(path, &b)
+		if err == nil {
+			// TODO: validate configuration
+			for i, _ := range b.NeighborList {
+				SetNeighborTypeDefault(&b.NeighborList[i])
+			}
+		}
+
+		configCh <- b
+	}
+}
+
+func inSlice(n NeighborType, b []NeighborType) bool {
+	for _, nb := range b {
+		if nb.NeighborAddress.String() == n.NeighborAddress.String() {
+			return true
+		}
+	}
+	return false
+}
+
+func UpdateConfig(curC *BgpType, newC *BgpType) (*BgpType, []NeighborType, []NeighborType) {
+	bgpConfig := BgpType{}
+	if curC == nil {
+		bgpConfig.Global = newC.Global
+		curC = &bgpConfig
+	} else {
+		// can't update the global config
+		bgpConfig.Global = curC.Global
+	}
+	added := []NeighborType{}
+	deleted := []NeighborType{}
+
+	for _, n := range newC.NeighborList {
+		if inSlice(n, curC.NeighborList) == false {
+			added = append(added, n)
+		}
+	}
+
+	for _, n := range curC.NeighborList {
+		if inSlice(n, newC.NeighborList) == false {
+			deleted = append(deleted, n)
+		}
+	}
+
+	bgpConfig.NeighborList = newC.NeighborList
+	return &bgpConfig, added, deleted
+}