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utils.go
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utils.go
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// Copyright 2023 vArmor 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 runtime
import (
"context"
"net"
"time"
"github.com/containerd/containerd"
"github.com/containerd/containerd/namespaces"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
)
// maxMsgSize use 16MB as the default message size limit.
// grpc library default is 4MB
const maxMsgSize = 1024 * 1024 * 16
// appContext return a context with cancel
func appContext(ctx context.Context, namespace string, timeout time.Duration) (context.Context, context.CancelFunc) {
ctx = namespaces.WithNamespace(ctx, namespace)
if timeout > 0 {
return context.WithTimeout(ctx, timeout)
}
return context.WithCancel(ctx)
}
// getContextWithTimeout returns a context with timeout.
func getContextWithTimeout(ctx context.Context, timeout time.Duration) (context.Context, context.CancelFunc) {
return context.WithTimeout(ctx, timeout)
}
// newContainerdClient returns a new containerd client
func newContainerdClient(endpoint string, timeout time.Duration, opts ...containerd.ClientOpt) (*containerd.Client, error) {
timeoutOpt := containerd.WithTimeout(timeout)
opts = append(opts, timeoutOpt)
client, err := containerd.New(endpoint, opts...)
if err != nil {
return nil, err
}
return client, nil
}
func dial(ctx context.Context, addr string) (net.Conn, error) {
return (&net.Dialer{}).DialContext(ctx, "unix", addr)
}
func getConnection(endpoint string, timeout time.Duration) (*grpc.ClientConn, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
return grpc.DialContext(ctx, endpoint,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithContextDialer(dial),
grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(maxMsgSize)),
)
}
func newRuntimeServiceClient(endpoint string, timeout time.Duration) (runtimeapi.RuntimeServiceClient, *grpc.ClientConn, error) {
conn, err := getConnection(endpoint, timeout)
if err != nil {
return nil, nil, errors.Wrap(err, "connect")
}
runtimeClient := runtimeapi.NewRuntimeServiceClient(conn)
return runtimeClient, conn, nil
}