mirror of https://github.com/bcicen/ctop.git
105 lines
2.3 KiB
Go
105 lines
2.3 KiB
Go
package connector
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import (
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"fmt"
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"sort"
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"sync"
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"time"
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"github.com/bcicen/ctop/container"
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"github.com/bcicen/ctop/logging"
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)
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var (
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log = logging.Init()
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enabled = make(map[string]ConnectorFn)
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)
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type ConnectorFn func() (Connector, error)
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type Connector interface {
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// All returns a pre-sorted container.Containers of all discovered containers
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All() container.Containers
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// Get returns a single container.Container by ID
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Get(string) (*container.Container, bool)
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// Wait blocks until the underlying connection is lost
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Wait() struct{}
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}
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// ConnectorSuper provides initial connection and retry on failure for
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// an undlerying Connector type
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type ConnectorSuper struct {
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conn Connector
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connFn ConnectorFn
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err error
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lock sync.RWMutex
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}
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func NewConnectorSuper(connFn ConnectorFn) *ConnectorSuper {
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cs := &ConnectorSuper{
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connFn: connFn,
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err: fmt.Errorf("connecting..."),
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}
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go cs.loop()
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return cs
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}
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// Get returns the underlying Connector, or nil and an error
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// if the Connector is not yet initialized or is disconnected.
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func (cs *ConnectorSuper) Get() (Connector, error) {
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cs.lock.RLock()
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defer cs.lock.RUnlock()
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if cs.err != nil {
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return nil, cs.err
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}
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return cs.conn, nil
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}
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func (cs *ConnectorSuper) setError(err error) {
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cs.lock.Lock()
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defer cs.lock.Unlock()
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cs.err = err
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}
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func (cs *ConnectorSuper) loop() {
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const interval = 3
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for {
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log.Infof("initializing connector")
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conn, err := cs.connFn()
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if err != nil {
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cs.setError(err)
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log.Errorf("failed to initialize connector: %s (%T)", err, err)
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log.Errorf("retrying in %ds", interval)
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time.Sleep(interval * time.Second)
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} else {
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cs.conn = conn
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cs.setError(nil)
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log.Infof("successfully initialized connector")
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// wait until connection closed
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cs.conn.Wait()
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cs.setError(fmt.Errorf("attempting to reconnect..."))
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log.Infof("connector closed")
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}
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}
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}
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// Enabled returns names for all enabled connectors on the current platform
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func Enabled() (a []string) {
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for k, _ := range enabled {
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a = append(a, k)
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}
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sort.Strings(a)
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return a
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}
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// ByName returns a ConnectorSuper for a given name, or error if the connector
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// does not exists on the current platform
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func ByName(s string) (*ConnectorSuper, error) {
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if cfn, ok := enabled[s]; ok {
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return NewConnectorSuper(cfn), nil
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}
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return nil, fmt.Errorf("invalid connector type \"%s\"", s)
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}
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