85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
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// 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/cfgfile"
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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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// Provider for autodiscover
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type Provider interface {
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cfgfile.Runner
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}
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// ProviderBuilder creates a new provider based on the given config and returns it
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type ProviderBuilder func(bus.Bus, *common.Config) (Provider, error)
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// AddProvider registers a new ProviderBuilder
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func (r *registry) AddProvider(name string, provider ProviderBuilder) 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("provider name is required")
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}
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_, exists := r.providers[name]
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if exists {
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return fmt.Errorf("provider '%s' is already registered", name)
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}
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if provider == nil {
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return fmt.Errorf("provider '%s' cannot be registered with a nil factory", name)
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}
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r.providers[name] = provider
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logp.Debug(debugK, "Provider registered: %s", name)
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return nil
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}
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// GetProvider returns the provider with the giving name, nil if it doesn't exist
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func (r *registry) GetProvider(name string) ProviderBuilder {
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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.providers[name]
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}
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// BuildProvider reads provider configuration and instantiate one
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func (r *registry) BuildProvider(bus bus.Bus, c *common.Config) (Provider, error) {
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var config ProviderConfig
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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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builder := r.GetProvider(config.Type)
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if builder == nil {
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return nil, fmt.Errorf("Unknown autodiscover provider %s", config.Type)
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}
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return builder(bus, c)
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}
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