/
containerd.go
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/
containerd.go
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// Copyright 2022-2024 The Parca Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package containerd
import (
"context"
"encoding/json"
"errors"
"fmt"
"net"
"strings"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
pb "k8s.io/cri-api/pkg/apis/runtime/v1"
)
const (
DefaultSocketPath = "/run/containerd/containerd.sock"
DefaultK3SSocketPath = "/run/k3s/containerd/containerd.sock"
DefaultTimeout = 2 * time.Second
)
type Client struct {
conn *grpc.ClientConn
client pb.RuntimeServiceClient
}
func NewContainerdClient(path string) (*Client, error) {
conn, err := grpc.Dial(
path,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
var d net.Dialer
ctx, cancel := context.WithTimeout(ctx, DefaultTimeout)
defer cancel()
d.LocalAddr = nil // if you have a local addr, add it here
raddr := net.UnixAddr{Name: path, Net: "unix"}
return d.DialContext(ctx, "unix", raddr.String())
}),
)
if err != nil {
return nil, err
}
client := pb.NewRuntimeServiceClient(conn)
return &Client{
conn: conn,
client: client,
}, nil
}
func (c *Client) Close() error {
if c.conn != nil {
return c.conn.Close()
}
return nil
}
func (c *Client) PIDFromContainerID(containerID string) (int, error) {
if !strings.HasPrefix(containerID, "containerd://") {
return -1, fmt.Errorf("invalid CRI %s, it should be containerd", containerID)
}
containerID = strings.TrimPrefix(containerID, "containerd://")
request := &pb.ContainerStatusRequest{
ContainerId: containerID,
Verbose: true,
}
status, err := c.client.ContainerStatus(context.Background(), request)
if err != nil {
return -1, fmt.Errorf("failed to get container status, request: %v: %w", request, err)
}
info, ok := status.Info["info"]
if !ok {
return -1, errors.New("container status reply from runtime doesn't contain 'info'")
}
containerdInspect := struct {
PID int `json:"pid"`
}{}
if err := json.Unmarshal([]byte(info), &containerdInspect); err != nil {
return -1, err
}
return containerdInspect.PID, nil
}