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Copy pathmanager.go
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77 lines (66 loc) · 1.83 KB
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package plugin
import (
"fmt"
"sync"
)
var (
doOnce sync.Once
instance *Manager
)
// Manager handles CQProviders that can be either embedded (self-run provider for example) or remote using go_plugin
// Important: manager is currently not thread safe
type Manager struct {
clients map[string]managedPlugin
}
// Shutdown closes all clients and cleans the managed clients
func (p *Manager) Shutdown() {
for _, c := range p.clients {
c.Close()
}
// create fresh map
p.clients = make(map[string]managedPlugin)
}
func (p *Manager) GetProvider(providerName, version string) (CQProvider, error) {
cq, ok := p.clients[providerName]
if !ok {
return nil, fmt.Errorf("plugin %s@%s does not exist", providerName, version)
}
return cq.Provider(), nil
}
func (p *Manager) AddEmbeddedPlugin(providerName string, cqp CQProvider) {
p.clients[providerName] = newEmbeddedPlugin(providerName, "latest", cqp)
}
func (p *Manager) KillProvider(providerName string) error {
client, ok := p.clients[providerName]
if !ok {
return fmt.Errorf("client for provider %s does not exist", providerName)
}
client.Close()
delete(p.clients, providerName)
return nil
}
func (p *Manager) GetOrCreateProvider(providerName, version string) (CQProvider, error) {
provider, err := p.GetProvider(providerName, version)
if provider != nil || err == nil {
return provider, err
}
// Create RPC client and initialize CQProvider
return p.createProvider(providerName, version)
}
func (p *Manager) createProvider(providerName, version string) (CQProvider, error) {
mPlugin, err := newRemotePlugin(providerName, version)
if err != nil {
return nil, err
}
p.clients[providerName] = mPlugin
return mPlugin.Provider(), nil
}
func GetManager() *Manager {
doOnce.Do(
func() {
instance = &Manager{
clients: make(map[string]managedPlugin),
}
})
return instance
}