forked from github/multus-cni
505ab4567c
This changes introduce delegate API function in multus-daemon. This API will be consumed from other programs for hot-plug interface into running pod. This change also cleanups server code to split into client code and server code to easy to import from other golang code.
88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
// Copyright (c) 2022 Multus Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 api
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"strings"
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)
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const (
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// MultusCNIAPIEndpoint is an endpoint for multus CNI request (for multus-shim)
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MultusCNIAPIEndpoint = "/cni"
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// MultusDelegateAPIEndpoint is an endpoint for multus delegate request (for hotplug)
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MultusDelegateAPIEndpoint = "/delegate"
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defaultMultusRunDir = "/run/multus/"
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)
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// DoCNI sends a CNI request to the CNI server via JSON + HTTP over a root-owned unix socket,
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// and returns the result
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func DoCNI(url string, req interface{}, socketPath string) ([]byte, error) {
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data, err := json.Marshal(req)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal CNI request %v: %v", req, err)
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}
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client := &http.Client{
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Transport: &http.Transport{
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Dial: func(proto, addr string) (net.Conn, error) {
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return net.Dial("unix", socketPath)
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},
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},
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}
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resp, err := client.Post(url, "application/json", bytes.NewReader(data))
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if err != nil {
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return nil, fmt.Errorf("failed to send CNI request: %v", err)
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read CNI result: %v", err)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("CNI request failed with status %v: '%s'", resp.StatusCode, string(body))
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}
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return body, nil
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}
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// GetAPIEndpoint returns endpoint URL for multus-daemon
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func GetAPIEndpoint(endpoint string) string {
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return fmt.Sprintf("http://dummy/%s", endpoint)
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}
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// CreateDelegateRequest creates Request for delegate API request
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func CreateDelegateRequest(cniCommand, cniContainerID, cniNetNS, cniIFName, podNamespace, podName, podUID string, cniConfig []byte) *Request {
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return &Request{
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Env: map[string]string{
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"CNI_COMMAND": strings.ToUpper(cniCommand),
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"CNI_CONTAINERID": cniContainerID,
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"CNI_NETNS": cniNetNS,
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"CNI_IFNAME": cniIFName,
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"CNI_ARGS": fmt.Sprintf("K8S_POD_NAMESPACE=%s;K8S_POD_NAME=%s;K8S_POD_UID=%s", podNamespace, podName, podUID),
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},
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Config: cniConfig,
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}
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}
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