445 lines
12 KiB
Go
445 lines
12 KiB
Go
package server
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import (
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"bufio"
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"errors"
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"fmt"
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"os"
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"strconv"
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"strings"
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"syscall"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"github.com/docker/containerd/api/grpc/types"
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"github.com/docker/containerd/runtime"
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"github.com/docker/containerd/supervisor"
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"github.com/opencontainers/runc/libcontainer"
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"github.com/opencontainers/runc/libcontainer/cgroups"
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"github.com/opencontainers/runc/libcontainer/system"
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"github.com/opencontainers/specs"
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"golang.org/x/net/context"
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)
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type apiServer struct {
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sv *supervisor.Supervisor
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}
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// NewServer returns grpc server instance
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func NewServer(sv *supervisor.Supervisor) types.APIServer {
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return &apiServer{
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sv: sv,
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}
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}
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func (s *apiServer) CreateContainer(ctx context.Context, c *types.CreateContainerRequest) (*types.CreateContainerResponse, error) {
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if c.BundlePath == "" {
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return nil, errors.New("empty bundle path")
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}
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e := &supervisor.StartTask{}
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e.ID = c.Id
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e.BundlePath = c.BundlePath
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e.Stdin = c.Stdin
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e.Stdout = c.Stdout
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e.Stderr = c.Stderr
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e.Labels = c.Labels
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e.StartResponse = make(chan supervisor.StartResponse, 1)
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if c.Checkpoint != "" {
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e.Checkpoint = &runtime.Checkpoint{
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Name: c.Checkpoint,
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}
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}
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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r := <-e.StartResponse
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apiC, err := createAPIContainer(r.Container, false)
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if err != nil {
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return nil, err
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}
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return &types.CreateContainerResponse{
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Container: apiC,
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}, nil
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}
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func (s *apiServer) Signal(ctx context.Context, r *types.SignalRequest) (*types.SignalResponse, error) {
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e := &supervisor.SignalTask{}
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e.ID = r.Id
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e.PID = r.Pid
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e.Signal = syscall.Signal(int(r.Signal))
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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return &types.SignalResponse{}, nil
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}
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func (s *apiServer) AddProcess(ctx context.Context, r *types.AddProcessRequest) (*types.AddProcessResponse, error) {
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process := &runtime.ProcessSpec{
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Terminal: r.Terminal,
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Args: r.Args,
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Env: r.Env,
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Cwd: r.Cwd,
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User: specs.User{
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UID: r.User.Uid,
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GID: r.User.Gid,
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AdditionalGids: r.User.AdditionalGids,
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},
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}
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if r.Id == "" {
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return nil, fmt.Errorf("container id cannot be empty")
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}
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if r.Pid == "" {
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return nil, fmt.Errorf("process id cannot be empty")
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}
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e := &supervisor.AddProcessTask{}
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e.ID = r.Id
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e.PID = r.Pid
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e.ProcessSpec = process
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e.Stdin = r.Stdin
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e.Stdout = r.Stdout
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e.Stderr = r.Stderr
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e.StartResponse = make(chan supervisor.StartResponse, 1)
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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<-e.StartResponse
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return &types.AddProcessResponse{}, nil
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}
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func (s *apiServer) CreateCheckpoint(ctx context.Context, r *types.CreateCheckpointRequest) (*types.CreateCheckpointResponse, error) {
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e := &supervisor.CreateCheckpointTask{}
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e.ID = r.Id
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e.Checkpoint = &runtime.Checkpoint{
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Name: r.Checkpoint.Name,
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Exit: r.Checkpoint.Exit,
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Tcp: r.Checkpoint.Tcp,
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UnixSockets: r.Checkpoint.UnixSockets,
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Shell: r.Checkpoint.Shell,
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}
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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return &types.CreateCheckpointResponse{}, nil
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}
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func (s *apiServer) DeleteCheckpoint(ctx context.Context, r *types.DeleteCheckpointRequest) (*types.DeleteCheckpointResponse, error) {
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if r.Name == "" {
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return nil, errors.New("checkpoint name cannot be empty")
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}
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e := &supervisor.DeleteCheckpointTask{}
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e.ID = r.Id
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e.Checkpoint = &runtime.Checkpoint{
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Name: r.Name,
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}
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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return &types.DeleteCheckpointResponse{}, nil
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}
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func (s *apiServer) ListCheckpoint(ctx context.Context, r *types.ListCheckpointRequest) (*types.ListCheckpointResponse, error) {
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e := &supervisor.GetContainersTask{}
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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var container runtime.Container
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for _, c := range e.Containers {
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if c.ID() == r.Id {
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container = c
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break
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}
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}
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if container == nil {
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return nil, grpc.Errorf(codes.NotFound, "no such containers")
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}
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var out []*types.Checkpoint
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checkpoints, err := container.Checkpoints()
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if err != nil {
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return nil, err
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}
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for _, c := range checkpoints {
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out = append(out, &types.Checkpoint{
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Name: c.Name,
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Tcp: c.Tcp,
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Shell: c.Shell,
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UnixSockets: c.UnixSockets,
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// TODO: figure out timestamp
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//Timestamp: c.Timestamp,
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})
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}
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return &types.ListCheckpointResponse{Checkpoints: out}, nil
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}
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func (s *apiServer) State(ctx context.Context, r *types.StateRequest) (*types.StateResponse, error) {
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e := &supervisor.GetContainersTask{}
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e.ID = r.Id
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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m := s.sv.Machine()
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state := &types.StateResponse{
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Machine: &types.Machine{
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Cpus: uint32(m.Cpus),
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Memory: uint64(m.Memory),
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},
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}
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for _, c := range e.Containers {
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apiC, err := createAPIContainer(c, true)
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if err != nil {
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return nil, err
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}
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state.Containers = append(state.Containers, apiC)
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}
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return state, nil
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}
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func createAPIContainer(c runtime.Container, getPids bool) (*types.Container, error) {
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processes, err := c.Processes()
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if err != nil {
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return nil, grpc.Errorf(codes.Internal, "get processes for container")
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}
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var procs []*types.Process
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for _, p := range processes {
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oldProc := p.Spec()
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stdio := p.Stdio()
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procs = append(procs, &types.Process{
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Pid: p.ID(),
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SystemPid: uint32(p.SystemPid()),
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Terminal: oldProc.Terminal,
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Args: oldProc.Args,
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Env: oldProc.Env,
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Cwd: oldProc.Cwd,
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Stdin: stdio.Stdin,
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Stdout: stdio.Stdout,
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Stderr: stdio.Stderr,
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User: &types.User{
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Uid: oldProc.User.UID,
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Gid: oldProc.User.GID,
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AdditionalGids: oldProc.User.AdditionalGids,
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},
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})
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}
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var pids []int
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if getPids {
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if pids, err = c.Pids(); err != nil {
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return nil, grpc.Errorf(codes.Internal, "get all pids for container")
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}
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}
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return &types.Container{
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Id: c.ID(),
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BundlePath: c.Path(),
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Processes: procs,
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Labels: c.Labels(),
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Status: string(c.State()),
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Pids: toUint32(pids),
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}, nil
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}
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func toUint32(its []int) []uint32 {
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o := []uint32{}
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for _, i := range its {
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o = append(o, uint32(i))
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}
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return o
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}
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func (s *apiServer) UpdateContainer(ctx context.Context, r *types.UpdateContainerRequest) (*types.UpdateContainerResponse, error) {
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e := &supervisor.UpdateTask{}
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e.ID = r.Id
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e.State = runtime.State(r.Status)
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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return &types.UpdateContainerResponse{}, nil
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}
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func (s *apiServer) UpdateProcess(ctx context.Context, r *types.UpdateProcessRequest) (*types.UpdateProcessResponse, error) {
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e := &supervisor.UpdateProcessTask{}
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e.ID = r.Id
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e.PID = r.Pid
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e.Height = int(r.Height)
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e.Width = int(r.Width)
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e.CloseStdin = r.CloseStdin
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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return &types.UpdateProcessResponse{}, nil
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}
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func (s *apiServer) Events(r *types.EventsRequest, stream types.API_EventsServer) error {
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t := time.Time{}
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if r.Timestamp != 0 {
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t = time.Unix(int64(r.Timestamp), 0)
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}
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events := s.sv.Events(t)
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defer s.sv.Unsubscribe(events)
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for e := range events {
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if err := stream.Send(&types.Event{
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Id: e.ID,
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Type: e.Type,
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Timestamp: uint64(e.Timestamp.Unix()),
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Pid: e.PID,
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Status: uint32(e.Status),
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}); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *apiServer) Stats(ctx context.Context, r *types.StatsRequest) (*types.StatsResponse, error) {
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e := &supervisor.StatsTask{}
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e.ID = r.Id
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e.Stat = make(chan *runtime.Stat, 1)
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s.sv.SendTask(e)
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if err := <-e.ErrorCh(); err != nil {
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return nil, err
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}
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stats := <-e.Stat
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t := convertToPb(stats)
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return t, nil
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}
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func convertToPb(st *runtime.Stat) *types.StatsResponse {
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pbSt := &types.StatsResponse{
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Timestamp: uint64(st.Timestamp.Unix()),
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CgroupStats: &types.CgroupStats{},
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}
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lcSt, ok := st.Data.(*libcontainer.Stats)
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if !ok {
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return pbSt
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}
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cpuSt := lcSt.CgroupStats.CpuStats
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systemUsage, _ := getSystemCPUUsage()
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pbSt.CgroupStats.CpuStats = &types.CpuStats{
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CpuUsage: &types.CpuUsage{
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TotalUsage: cpuSt.CpuUsage.TotalUsage,
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PercpuUsage: cpuSt.CpuUsage.PercpuUsage,
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UsageInKernelmode: cpuSt.CpuUsage.UsageInKernelmode,
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UsageInUsermode: cpuSt.CpuUsage.UsageInUsermode,
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},
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ThrottlingData: &types.ThrottlingData{
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Periods: cpuSt.ThrottlingData.Periods,
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ThrottledPeriods: cpuSt.ThrottlingData.ThrottledPeriods,
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ThrottledTime: cpuSt.ThrottlingData.ThrottledTime,
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},
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SystemUsage: systemUsage,
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}
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memSt := lcSt.CgroupStats.MemoryStats
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pbSt.CgroupStats.MemoryStats = &types.MemoryStats{
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Cache: memSt.Cache,
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Usage: &types.MemoryData{
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Usage: memSt.Usage.Usage,
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MaxUsage: memSt.Usage.MaxUsage,
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Failcnt: memSt.Usage.Failcnt,
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Limit: memSt.Usage.Limit,
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},
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SwapUsage: &types.MemoryData{
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Usage: memSt.SwapUsage.Usage,
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MaxUsage: memSt.SwapUsage.MaxUsage,
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Failcnt: memSt.SwapUsage.Failcnt,
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Limit: memSt.SwapUsage.Limit,
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},
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KernelUsage: &types.MemoryData{
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Usage: memSt.KernelUsage.Usage,
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MaxUsage: memSt.KernelUsage.MaxUsage,
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Failcnt: memSt.KernelUsage.Failcnt,
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Limit: memSt.KernelUsage.Limit,
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},
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}
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blkSt := lcSt.CgroupStats.BlkioStats
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pbSt.CgroupStats.BlkioStats = &types.BlkioStats{
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IoServiceBytesRecursive: convertBlkioEntryToPb(blkSt.IoServiceBytesRecursive),
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IoServicedRecursive: convertBlkioEntryToPb(blkSt.IoServicedRecursive),
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IoQueuedRecursive: convertBlkioEntryToPb(blkSt.IoQueuedRecursive),
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IoServiceTimeRecursive: convertBlkioEntryToPb(blkSt.IoServiceTimeRecursive),
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IoWaitTimeRecursive: convertBlkioEntryToPb(blkSt.IoWaitTimeRecursive),
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IoMergedRecursive: convertBlkioEntryToPb(blkSt.IoMergedRecursive),
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IoTimeRecursive: convertBlkioEntryToPb(blkSt.IoTimeRecursive),
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SectorsRecursive: convertBlkioEntryToPb(blkSt.SectorsRecursive),
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}
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pbSt.CgroupStats.HugetlbStats = make(map[string]*types.HugetlbStats)
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for k, st := range lcSt.CgroupStats.HugetlbStats {
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pbSt.CgroupStats.HugetlbStats[k] = &types.HugetlbStats{
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Usage: st.Usage,
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MaxUsage: st.MaxUsage,
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Failcnt: st.Failcnt,
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}
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}
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return pbSt
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}
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func convertBlkioEntryToPb(b []cgroups.BlkioStatEntry) []*types.BlkioStatsEntry {
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var pbEs []*types.BlkioStatsEntry
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for _, e := range b {
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pbEs = append(pbEs, &types.BlkioStatsEntry{
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Major: e.Major,
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Minor: e.Minor,
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Op: e.Op,
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Value: e.Value,
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})
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}
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return pbEs
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}
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const nanoSecondsPerSecond = 1e9
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var clockTicksPerSecond = uint64(system.GetClockTicks())
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// getSystemCPUUsage returns the host system's cpu usage in
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// nanoseconds. An error is returned if the format of the underlying
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// file does not match.
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//
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// Uses /proc/stat defined by POSIX. Looks for the cpu
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// statistics line and then sums up the first seven fields
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// provided. See `man 5 proc` for details on specific field
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// information.
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func getSystemCPUUsage() (uint64, error) {
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var line string
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f, err := os.Open("/proc/stat")
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if err != nil {
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return 0, err
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}
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bufReader := bufio.NewReaderSize(nil, 128)
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defer func() {
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bufReader.Reset(nil)
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f.Close()
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}()
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bufReader.Reset(f)
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err = nil
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for err == nil {
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line, err = bufReader.ReadString('\n')
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if err != nil {
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break
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}
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parts := strings.Fields(line)
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switch parts[0] {
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case "cpu":
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if len(parts) < 8 {
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return 0, fmt.Errorf("bad format of cpu stats")
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}
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var totalClockTicks uint64
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for _, i := range parts[1:8] {
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v, err := strconv.ParseUint(i, 10, 64)
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if err != nil {
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return 0, fmt.Errorf("error parsing cpu stats")
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}
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totalClockTicks += v
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}
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return (totalClockTicks * nanoSecondsPerSecond) /
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clockTicksPerSecond, nil
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}
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}
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return 0, fmt.Errorf("bad stats format")
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}
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