120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may 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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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ttrpcutil
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import (
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"sync"
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"time"
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v1 "github.com/containerd/containerd/api/services/ttrpc/events/v1"
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"github.com/containerd/containerd/pkg/dialer"
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"github.com/containerd/ttrpc"
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"github.com/pkg/errors"
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)
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const ttrpcDialTimeout = 5 * time.Second
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type ttrpcConnector func() (*ttrpc.Client, error)
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// Client is the client to interact with TTRPC part of containerd server (plugins, events)
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type Client struct {
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mu sync.Mutex
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connector ttrpcConnector
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client *ttrpc.Client
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closed bool
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}
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// NewClient returns a new containerd TTRPC client that is connected to the containerd instance provided by address
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func NewClient(address string, opts ...ttrpc.ClientOpts) (*Client, error) {
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connector := func() (*ttrpc.Client, error) {
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conn, err := dialer.Dialer(address, ttrpcDialTimeout)
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if err != nil {
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return nil, errors.Wrap(err, "failed to connect")
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}
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client := ttrpc.NewClient(conn, opts...)
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return client, nil
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}
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return &Client{
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connector: connector,
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}, nil
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}
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// Reconnect re-establishes the TTRPC connection to the containerd daemon
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func (c *Client) Reconnect() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.connector == nil {
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return errors.New("unable to reconnect to containerd, no connector available")
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}
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if c.closed {
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return errors.New("client is closed")
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}
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if c.client != nil {
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if err := c.client.Close(); err != nil {
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return err
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}
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}
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client, err := c.connector()
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if err != nil {
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return err
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}
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c.client = client
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return nil
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}
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// EventsService creates an EventsService client
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func (c *Client) EventsService() (v1.EventsService, error) {
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client, err := c.Client()
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if err != nil {
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return nil, err
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}
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return v1.NewEventsClient(client), nil
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}
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// Client returns the underlying TTRPC client object
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func (c *Client) Client() (*ttrpc.Client, error) {
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c.mu.Lock()
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defer c.mu.Unlock()
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if c.client == nil {
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client, err := c.connector()
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if err != nil {
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return nil, err
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}
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c.client = client
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}
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return c.client, nil
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}
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// Close closes the clients TTRPC connection to containerd
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func (c *Client) Close() error {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.closed = true
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if c.client != nil {
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return c.client.Close()
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}
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return nil
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}
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