/
client.go
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/
client.go
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package client
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/pingcap/tidb-operator/tests/pkg/fault-trigger/api"
"github.com/pingcap/tidb-operator/tests/pkg/fault-trigger/manager"
"github.com/pingcap/tidb-operator/tests/pkg/util"
)
// Client is a fault-trigger client
type Client interface {
// ListVMs lists all virtual machines
ListVMs() ([]*manager.VM, error)
// StartVM start a specified virtual machine
StartVM(vm *manager.VM) error
// StopVM stops a specified virtual machine
StopVM(vm *manager.VM) error
// StartETCD starts the etcd service
StartETCD() error
// StopETCD stops the etcd service
StopETCD() error
// StartKubelet starts the kubelet service
StartKubelet() error
// StopKubelet stops the kubelet service
StopKubelet() error
}
// client is used to communicate with the fault-trigger
type client struct {
cfg Config
httpCli *http.Client
}
// Config defines for fault-trigger client
type Config struct {
Addr string
}
// NewClient creates a new fault-trigger client from a given address
func NewClient(cfg Config) Client {
return &client{
cfg: cfg,
httpCli: http.DefaultClient,
}
}
type clientError struct {
code int
msg string
}
func (e *clientError) Error() string {
return fmt.Sprintf("%s (code: %d)", e.msg, e.code)
}
func (c client) do(req *http.Request) (*http.Response, []byte, error) {
resp, err := c.httpCli.Do(req)
if err != nil {
return nil, nil, err
}
defer resp.Body.Close()
code := resp.StatusCode
if code != http.StatusOK {
return resp, nil, &clientError{
code: code,
msg: "fail to request to http service",
}
}
bodyByte, err := ioutil.ReadAll(resp.Body)
if err != nil {
return resp, nil, &clientError{
code: code,
msg: fmt.Sprintf("failed to read data from resp body, error: %v", err),
}
}
data, err := api.ExtractResponse(bodyByte)
if err != nil {
return resp, nil, &clientError{
code: code,
msg: err.Error(),
}
}
return resp, data, err
}
func (c client) get(url string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, fmt.Errorf("error creating request: %v", err)
}
_, body, err := c.do(req)
if err != nil {
return nil, err
}
return body, nil
}
func (c *client) ListVMs() ([]*manager.VM, error) {
url := util.GenURL(fmt.Sprintf("%s%s/vms", c.cfg.Addr, api.APIPrefix))
data, err := c.get(url)
if err != nil {
return nil, err
}
var vms []*manager.VM
if err = json.Unmarshal(data, &vms); err != nil {
return nil, err
}
return vms, nil
}
func (c *client) StartVM(vm *manager.VM) error {
if err := vm.Verify(); err != nil {
return err
}
vmName := vm.Name
if len(vmName) == 0 {
vmName = vm.IP
}
url := util.GenURL(fmt.Sprintf("%s/%s/vm/%s/start", c.cfg.Addr, api.APIPrefix, vmName))
if _, err := c.get(url); err != nil {
return err
}
return nil
}
func (c *client) StopVM(vm *manager.VM) error {
if err := vm.Verify(); err != nil {
return err
}
vmName := vm.Name
if len(vmName) == 0 {
vmName = vm.IP
}
url := util.GenURL(fmt.Sprintf("%s/%s/vm/%s/stop", c.cfg.Addr, api.APIPrefix, vmName))
if _, err := c.get(url); err != nil {
return err
}
return nil
}
func (c *client) StartETCD() error {
url := util.GenURL(fmt.Sprintf("%s/%s/etcd/start", c.cfg.Addr, api.APIPrefix))
if _, err := c.get(url); err != nil {
return err
}
return nil
}
func (c *client) StopETCD() error {
url := util.GenURL(fmt.Sprintf("%s/%s/etcd/stop", c.cfg.Addr, api.APIPrefix))
if _, err := c.get(url); err != nil {
return err
}
return nil
}
func (c *client) StartKubelet() error {
url := util.GenURL(fmt.Sprintf("%s/%s/kubelet/start", c.cfg.Addr, api.APIPrefix))
if _, err := c.get(url); err != nil {
return err
}
return nil
}
func (c *client) StopKubelet() error {
url := util.GenURL(fmt.Sprintf("%s/%s/kubelet/stop", c.cfg.Addr, api.APIPrefix))
if _, err := c.get(url); err != nil {
return err
}
return nil
}