Merge pull request #854 from micro/lock-http

Lock http
This commit is contained in:
Asim Aslam 2019-10-14 22:01:25 +01:00 committed by GitHub
commit df1e680256
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2 changed files with 180 additions and 0 deletions

135
sync/lock/http/http.go Normal file
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// Package http adds a http lock implementation
package http
import (
"errors"
"fmt"
"hash/crc32"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"strings"
"github.com/micro/go-micro/sync/lock"
)
var (
DefaultPath = "/sync/lock"
DefaultAddress = "localhost:8080"
)
type httpLock struct {
opts lock.Options
}
func (h *httpLock) url(do, id string) (string, error) {
sum := crc32.ChecksumIEEE([]byte(id))
node := h.opts.Nodes[sum%uint32(len(h.opts.Nodes))]
// parse the host:port or whatever
uri, err := url.Parse(node)
if err != nil {
return "", err
}
if len(uri.Scheme) == 0 {
uri.Scheme = "http"
}
// set path
// build path
path := filepath.Join(DefaultPath, do, h.opts.Prefix, id)
uri.Path = path
// return url
return uri.String(), nil
}
func (h *httpLock) Acquire(id string, opts ...lock.AcquireOption) error {
var options lock.AcquireOptions
for _, o := range opts {
o(&options)
}
uri, err := h.url("acquire", id)
if err != nil {
return err
}
ttl := fmt.Sprintf("%d", int64(options.TTL.Seconds()))
wait := fmt.Sprintf("%d", int64(options.Wait.Seconds()))
rsp, err := http.PostForm(uri, url.Values{
"id": {id},
"ttl": {ttl},
"wait": {wait},
})
if err != nil {
return err
}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return err
}
// success
if rsp.StatusCode == 200 {
return nil
}
// return error
return errors.New(string(b))
}
func (h *httpLock) Release(id string) error {
uri, err := h.url("release", id)
if err != nil {
return err
}
vals := url.Values{
"id": {id},
}
req, err := http.NewRequest("DELETE", uri, strings.NewReader(vals.Encode()))
if err != nil {
return err
}
rsp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer rsp.Body.Close()
b, err := ioutil.ReadAll(rsp.Body)
if err != nil {
return err
}
// success
if rsp.StatusCode == 200 {
return nil
}
// return error
return errors.New(string(b))
}
func NewLock(opts ...lock.Option) lock.Lock {
var options lock.Options
for _, o := range opts {
o(&options)
}
if len(options.Nodes) == 0 {
options.Nodes = []string{DefaultAddress}
}
return &httpLock{
opts: options,
}
}

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// Package server implements the sync http server
package server
import (
"net/http"
"github.com/micro/go-micro/sync/lock"
lkhttp "github.com/micro/go-micro/sync/lock/http"
)
func Handler(lk lock.Lock) http.Handler {
mux := http.NewServeMux()
mux.HandleFunc(lkhttp.DefaultPath, func(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
id := r.Form.Get("id")
if len(id) == 0 {
return
}
switch r.Method {
case "POST":
err := lk.Acquire(id)
if err != nil {
http.Error(w, err.Error(), 500)
}
case "DELETE":
err := lk.Release(id)
if err != nil {
http.Error(w, err.Error(), 500)
}
}
})
return mux
}
func Server(lk lock.Lock) *http.Server {
server := &http.Server{
Addr: lkhttp.DefaultAddress,
Handler: Handler(lk),
}
return server
}