103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package client
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"syscall"
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"time"
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"github.com/kubernetes-incubator/cri-o/types"
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)
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const (
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maxUnixSocketPathSize = len(syscall.RawSockaddrUnix{}.Path)
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)
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// CrioClient is an interface to get information from crio daemon endpoint.
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type CrioClient interface {
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DaemonInfo() (types.CrioInfo, error)
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ContainerInfo(string) (*types.ContainerInfo, error)
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}
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type crioClientImpl struct {
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client *http.Client
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crioSocketPath string
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}
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func configureUnixTransport(tr *http.Transport, proto, addr string) error {
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if len(addr) > maxUnixSocketPathSize {
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return fmt.Errorf("Unix socket path %q is too long", addr)
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}
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// No need for compression in local communications.
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tr.DisableCompression = true
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tr.Dial = func(_, _ string) (net.Conn, error) {
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return net.DialTimeout(proto, addr, 32*time.Second)
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}
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return nil
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}
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// New returns a crio client
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func New(crioSocketPath string) (CrioClient, error) {
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tr := new(http.Transport)
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configureUnixTransport(tr, "unix", crioSocketPath)
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c := &http.Client{
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Transport: tr,
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}
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return &crioClientImpl{
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client: c,
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crioSocketPath: crioSocketPath,
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}, nil
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}
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func (c *crioClientImpl) getRequest(path string) (*http.Request, error) {
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req, err := http.NewRequest("GET", path, nil)
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if err != nil {
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return nil, err
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}
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// For local communications over a unix socket, it doesn't matter what
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// the host is. We just need a valid and meaningful host name.
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req.Host = "crio"
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req.URL.Host = c.crioSocketPath
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req.URL.Scheme = "http"
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return req, nil
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}
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// DaemonInfo return cri-o daemon info from the cri-o
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// info endpoint.
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func (c *crioClientImpl) DaemonInfo() (types.CrioInfo, error) {
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info := types.CrioInfo{}
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req, err := c.getRequest("/info")
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if err != nil {
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return info, err
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}
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resp, err := c.client.Do(req)
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if err != nil {
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return info, err
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}
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defer resp.Body.Close()
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if err := json.NewDecoder(resp.Body).Decode(&info); err != nil {
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return info, err
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}
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return info, nil
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}
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// ContainerInfo returns container info by querying
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// the cri-o container endpoint.
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func (c *crioClientImpl) ContainerInfo(id string) (*types.ContainerInfo, error) {
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req, err := c.getRequest("/containers/" + id)
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if err != nil {
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return nil, err
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}
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resp, err := c.client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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cInfo := types.ContainerInfo{}
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if err := json.NewDecoder(resp.Body).Decode(&cInfo); err != nil {
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return nil, err
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}
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return &cInfo, nil
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}
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