Merge pull request #42 from kuramal/cni_plugin_conf_file_max_num

add cni plugin config file max num config

cni.go

@@ -41,10 +41,11 @@ type CNI interface {
 }
 
 type ConfigResult struct {
-	PluginDirs    []string
-	PluginConfDir string
-	Prefix        string
-	Networks      []*ConfNetwork
+	PluginDirs       []string
+	PluginConfDir    string
+	PluginMaxConfNum int
+	Prefix           string
+	Networks         []*ConfNetwork
 }
 
 type ConfNetwork struct {
@@ -78,9 +79,10 @@ type libcni struct {
 func defaultCNIConfig() *libcni {
 	return &libcni{
 		config: config{
-			pluginDirs:    []string{DefaultCNIDir},
-			pluginConfDir: DefaultNetDir,
-			prefix:        DefaultPrefix,
+			pluginDirs:       []string{DefaultCNIDir},
+			pluginConfDir:    DefaultNetDir,
+			pluginMaxConfNum: DefaultMaxConfNum,
+			prefix:           DefaultPrefix,
 		},
 		cniConfig: &cnilibrary.CNIConfig{
 			Path: []string{DefaultCNIDir},
@@ -187,9 +189,10 @@ func (c *libcni) GetConfig() *ConfigResult {
 	c.RLock()
 	defer c.RUnlock()
 	r := &ConfigResult{
-		PluginDirs:    c.config.pluginDirs,
-		PluginConfDir: c.config.pluginConfDir,
-		Prefix:        c.config.prefix,
+		PluginDirs:       c.config.pluginDirs,
+		PluginConfDir:    c.config.pluginConfDir,
+		PluginMaxConfNum: c.config.pluginMaxConfNum,
+		Prefix:           c.config.prefix,
 	}
 	for _, network := range c.networks {
 		conf := &NetworkConfList{

opts.go

@@ -54,6 +54,15 @@ func WithPluginConfDir(dir string) CNIOpt {
 	}
 }
 
+// WithPluginMaxConfNum can be used to configure the
+// max cni plugin config file num.
+func WithPluginMaxConfNum(max int) CNIOpt {
+	return func(c *libcni) error {
+		c.pluginMaxConfNum = max
+		return nil
+	}
+}
+
 // WithMinNetworkCount can be used to configure the
 // minimum networks to be configured and initialized
 // for the status to report success. By default its 1.
@@ -159,7 +168,7 @@ func WithConfListFile(fileName string) CNIOpt {
 // the convention chosen is - the first network configuration in the sorted
 // list of network conf files as the default network.
 func WithDefaultConf(c *libcni) error {
-	return loadFromConfDir(c, 1)
+	return loadFromConfDir(c, c.pluginMaxConfNum)
 }
 
 // WithAllConf can be used to detect all network config

types.go

@@ -20,14 +20,16 @@ const (
 	CNIPluginName        = "cni"
 	DefaultNetDir        = "/etc/cni/net.d"
 	DefaultCNIDir        = "/opt/cni/bin"
+	DefaultMaxConfNum    = 1
 	VendorCNIDirTemplate = "%s/opt/%s/bin"
 	DefaultPrefix        = "eth"
 )
 
 type config struct {
-	pluginDirs    []string
-	pluginConfDir string
-	prefix        string
+	pluginDirs       []string
+	pluginConfDir    string
+	pluginMaxConfNum int
+	prefix           string
 }
 
 type PortMapping struct {