Merge pull request apache#732 from DogBaoBao/feature/file_service_dis…

…covery

Ftr: File system service discovery

common/constant/key.go

@@ -169,6 +169,10 @@ const (
 	NACOS_USERNAME               = "username"
 )
 
+const (
+	FILE_KEY = "file"
+)
+
 const (
 	ZOOKEEPER_KEY = "zookeeper"
 )

common/url.go

@@ -396,6 +396,17 @@ func (c *URL) AddParam(key string, value string) {
 	c.params.Add(key, value)
 }
 
+// AddParamAvoidNil will add key-value pair
+// Not thread-safe
+// think twice before using it.
+func (c *URL) AddParamAvoidNil(key string, value string) {
+	if c.params == nil {
+		c.params = url.Values{}
+	}
+
+	c.params.Add(key, value)
+}
+
 // SetParam will put the key-value pair into url
 // it's not thread safe.
 // think twice before you want to use this method

config_center/apollo/impl.go

@@ -45,6 +45,7 @@ const (
 )
 
 type apolloConfiguration struct {
+	cc.BaseDynamicConfiguration
 	url *common.URL
 
 	listeners sync.Map

config_center/base_dynamic_configuration.go

@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package config_center
+
+// BaseDynamicConfiguration will default implementation DynamicConfiguration some method
+type BaseDynamicConfiguration struct {
+}
+
+// RemoveConfig
+func (bdc *BaseDynamicConfiguration) RemoveConfig(string, string) error {
+	return nil
+}

config_center/dynamic_configuration.go

@@ -58,6 +58,9 @@ type DynamicConfiguration interface {
 	// PublishConfig will publish the config with the (key, group, value) pair
 	PublishConfig(string, string, string) error
 
+	// RemoveConfig will remove the config white the (key, group) pair
+	RemoveConfig(string, string) error
+
 	// GetConfigKeysByGroup will return all keys with the group
 	GetConfigKeysByGroup(group string) (*gxset.HashSet, error)
 }

config_center/file/factory.go

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package file
+
+import (
+	perrors "github.com/pkg/errors"
+)
+
+import (
+	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/common/constant"
+	"github.com/apache/dubbo-go/common/extension"
+	"github.com/apache/dubbo-go/config_center"
+	"github.com/apache/dubbo-go/config_center/parser"
+)
+
+func init() {
+	extension.SetConfigCenterFactory(constant.FILE_KEY, func() config_center.DynamicConfigurationFactory {
+		return &fileDynamicConfigurationFactory{}
+	})
+}
+
+type fileDynamicConfigurationFactory struct {
+}
+
+// GetDynamicConfiguration Get Configuration with URL
+func (f *fileDynamicConfigurationFactory) GetDynamicConfiguration(url *common.URL) (config_center.DynamicConfiguration,
+	error) {
+	dynamicConfiguration, err := newFileSystemDynamicConfiguration(url)
+	if err != nil {
+		return nil, perrors.WithStack(err)
+	}
+
+	dynamicConfiguration.SetParser(&parser.DefaultConfigurationParser{})
+	return dynamicConfiguration, err
+}