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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| package nettop | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| var ( | ||
| dockerhttpc *http.Client | ||
| dockerInfo *slimDockerInfo | ||
| ) | ||
|
|
||
| const dockersock = "/var/run/docker.sock" | ||
|
|
||
| type slimDocker struct { | ||
| State slimDockerState `json:"State"` | ||
| HostConfig slimDockerHostConfig `json:"HostConfig"` | ||
| } | ||
|
|
||
| type slimDockerState struct { | ||
| Status string `json:"Status"` | ||
| Pid int `json:"Pid"` | ||
| } | ||
|
|
||
| type slimDockerHostConfig struct { | ||
| CgroupParent string `json:"CgroupParent"` | ||
| } | ||
|
|
||
| type slimDockerInfo struct { | ||
| CgroupDriver string `json:"CgroupDriver"` | ||
| } | ||
|
|
||
| func initializeDockerClient() { | ||
| if dockerhttpc != nil { | ||
| return | ||
| } | ||
| dockerhttpc = &http.Client{ | ||
| Transport: &http.Transport{ | ||
| DialContext: func(_ context.Context, _, _ string) (net.Conn, error) { | ||
| return net.Dial("unix", dockersock) | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| } | ||
|
|
||
| func initializeDockerInfo() error { | ||
| info, err := dockerHTTPRequest("/info") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| dockerInfo = &slimDockerInfo{} | ||
| if err := json.Unmarshal(info, dockerInfo); err != nil { | ||
| return fmt.Errorf("failed unmarshal %s to slimDockerInfo: %w", string(info), err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func dockerHTTPRequest(path string) ([]byte, error) { | ||
|
|
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| path = strings.TrimPrefix(path, "/") | ||
|
|
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| url := fmt.Sprintf("http://localhost/%s", path) | ||
|
|
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| resp, err := dockerhttpc.Get(url) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed request docker %s: %w", url, err) | ||
| } | ||
|
|
||
| data, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed read docker response: %w", err) | ||
| } | ||
|
|
||
| if resp.StatusCode != 200 { | ||
| return nil, fmt.Errorf("failed request docker %s, status code: %d, body: %s", url, resp.StatusCode, string(data)) | ||
| } | ||
|
|
||
| return data, nil | ||
| } | ||
|
|
||
| func getSandboxInfoSpecForDocker(id string) (*sandboxInfoSpec, error) { | ||
| if dockerhttpc == nil { | ||
| initializeDockerClient() | ||
| } | ||
|
|
||
| if dockerInfo == nil { | ||
| if err := initializeDockerInfo(); err != nil { | ||
| return nil, fmt.Errorf("failed get docker info: %w", err) | ||
| } | ||
| } | ||
|
|
||
| b, err := dockerHTTPRequest(fmt.Sprintf("/containers/%s/json", id)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed read container detail for %s from docker docker: %w", id, err) | ||
| } | ||
|
|
||
| docker := &slimDocker{} | ||
| if err := json.Unmarshal(b, docker); err != nil { | ||
| return nil, fmt.Errorf("failed unmarsh docker response for %s to slimDocker: %w", id, err) | ||
| } | ||
|
|
||
| return buildSandboxInfoSpecForDocker(docker) | ||
|
|
||
| } | ||
|
|
||
| func adjustCgroupParent(rawCgroupParent string) string { | ||
| if dockerInfo.CgroupDriver == "cgroupfs" { | ||
| return rawCgroupParent | ||
| } | ||
|
|
||
| arr := strings.Split(rawCgroupParent, "-") | ||
|
|
||
| if len(arr) == 2 { | ||
| //guaranteed pod, cgroup parent: kubepods-podfd9ea419_d65a_454e_9697_f7312cf47af7.slice | ||
| return fmt.Sprintf("/%[1]s.slice/%[1]s-%[2]s", arr[0], arr[1]) | ||
| } else if len(arr) == 3 { | ||
| //besteffort and burstable pod, cgroup parent: kubepods-burstable-podf4c0cdd8e0920b18d85d50904cb0f13d.slice | ||
| return fmt.Sprintf("/%[1]s.slice/%[1]s-%[2]s.slice/%[1]s-%[2]s-%[3]s", arr[0], arr[1], arr[2]) | ||
| } | ||
|
|
||
| log.Errorf("invalid cgroup parent path: %s", rawCgroupParent) | ||
| return "" | ||
| } | ||
|
|
||
| func buildSandboxInfoSpecForDocker(docker *slimDocker) (*sandboxInfoSpec, error) { | ||
| cgroupParent := adjustCgroupParent(docker.HostConfig.CgroupParent) | ||
| return &sandboxInfoSpec{ | ||
| Pid: docker.State.Pid, | ||
| Config: Config{ | ||
| Linux: Linux{ | ||
| CgroupParent: cgroupParent, | ||
| }, | ||
| }, | ||
| }, nil | ||
| } |