108 lines
3 KiB
Go
108 lines
3 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package autodiscover
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import (
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"fmt"
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"strings"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/libbeat/common/bus"
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"github.com/elastic/beats/libbeat/logp"
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)
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// Appender provides an interface by which extra configuration can be added into configs
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type Appender interface {
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// Append takes a processed event and add extra configuration
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Append(event bus.Event)
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}
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// Appenders is a list of Appender objects
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type Appenders []Appender
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// AppenderBuilder is a func used to generate a Appender object
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type AppenderBuilder func(*common.Config) (Appender, error)
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// AddBuilder registers a new AppenderBuilder
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func (r *registry) AddAppender(name string, appender AppenderBuilder) error {
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r.lock.Lock()
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defer r.lock.Unlock()
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if name == "" {
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return fmt.Errorf("appender name is required")
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}
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_, exists := r.appenders[name]
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if exists {
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return fmt.Errorf("appender '%s' is already registered", name)
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}
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if appender == nil {
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return fmt.Errorf("appender '%s' cannot be registered with a nil factory", name)
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}
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r.appenders[name] = appender
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logp.Debug(debugK, "Appender registered: %s", name)
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return nil
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}
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// GetAppender returns the appender with the giving name, nil if it doesn't exist
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func (r *registry) GetAppender(name string) AppenderBuilder {
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r.lock.RLock()
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defer r.lock.RUnlock()
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name = strings.ToLower(name)
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return r.appenders[name]
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}
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// BuildAppender reads provider configuration and instantiate one
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func (r *registry) BuildAppender(c *common.Config) (Appender, error) {
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var config AppenderConfig
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err := c.Unpack(&config)
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if err != nil {
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return nil, err
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}
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appender := r.GetAppender(config.Type)
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if appender == nil {
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return nil, fmt.Errorf("unknown autodiscover appender %s", config.Type)
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}
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return appender(c)
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}
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// Append uses all initialized appenders to modify generated bus.Events.
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func (a Appenders) Append(event bus.Event) {
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for _, appender := range a {
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appender.Append(event)
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}
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}
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// NewAppenders instances and returns the given list of appenders.
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func NewAppenders(aConfigs []*common.Config) (Appenders, error) {
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var appenders Appenders
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for _, acfg := range aConfigs {
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appender, err := Registry.BuildAppender(acfg)
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if err != nil {
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return nil, err
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}
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appenders = append(appenders, appender)
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}
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return appenders, nil
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}
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