mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
client: min client for discovery
This commit is contained in:
Brian Waldon
parent
0335422e81
commit
49cc76d33b
44
client/client.go
Normal file
44
client/client.go
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@ -0,0 +1,44 @@
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package client
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import (
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"errors"
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"fmt"
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"time"
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)
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var (
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ErrUnavailable = errors.New("client: no available etcd endpoints")
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ErrNoLeader = errors.New("client: no leader")
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ErrKeyNoExist = errors.New("client: key does not exist")
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ErrKeyExists = errors.New("client: key already exists")
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)
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type Client interface {
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Create(key, value string, ttl time.Duration) (*Response, error)
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Get(key string) (*Response, error)
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Watch(key string) Watcher
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RecursiveWatch(key string) Watcher
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}
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type Watcher interface {
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Next() (*Response, error)
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}
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type Response struct {
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Action string `json:"action"`
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Node *Node `json:"node"`
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PrevNode *Node `json:"prevNode"`
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}
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type Nodes []Node
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type Node struct {
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Key string `json:"key"`
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Value string `json:"value"`
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Nodes Nodes `json:"nodes"`
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ModifiedIndex uint64 `json:"modifiedIndex"`
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CreatedIndex uint64 `json:"createdIndex"`
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}
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func (n *Node) String() string {
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return fmt.Sprintf("{Key: %s, CreatedIndex: %d, ModifiedIndex: %d}", n.Key, n.CreatedIndex, n.ModifiedIndex)
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}
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276
client/http.go
Normal file
276
client/http.go
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@ -0,0 +1,276 @@
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package client
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"path"
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"strconv"
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"strings"
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"time"
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"github.com/coreos/etcd/third_party/code.google.com/p/go.net/context"
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)
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const (
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v2Prefix = "/v2/keys"
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)
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// transport mimics http.Transport to provide an interface which can be
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// substituted for testing (since the RoundTripper interface alone does not
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// require the CancelRequest method)
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type transport interface {
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http.RoundTripper
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CancelRequest(req *http.Request)
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}
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type httpClient struct {
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transport transport
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endpoint url.URL
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timeout time.Duration
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}
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func NewHTTPClient(tr *http.Transport, ep string, timeout time.Duration) (*httpClient, error) {
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u, err := url.Parse(ep)
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if err != nil {
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return nil, err
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}
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c := &httpClient{
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transport: tr,
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endpoint: *u,
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timeout: timeout,
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}
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return c, nil
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}
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func (c *httpClient) Create(key, val string, ttl time.Duration) (*Response, error) {
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uintTTL := uint64(ttl.Seconds())
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create := &createAction{
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Key: key,
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Value: val,
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TTL: &uintTTL,
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}
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ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
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httpresp, body, err := c.do(ctx, create)
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cancel()
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if err != nil {
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return nil, err
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}
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return unmarshalHTTPResponse(httpresp.StatusCode, body)
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}
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func (c *httpClient) Get(key string) (*Response, error) {
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get := &getAction{
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Key: key,
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Recursive: false,
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}
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ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
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httpresp, body, err := c.do(ctx, get)
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cancel()
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if err != nil {
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return nil, err
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}
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return unmarshalHTTPResponse(httpresp.StatusCode, body)
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}
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type roundTripResponse struct {
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resp *http.Response
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err error
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}
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func (c *httpClient) do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
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req := act.httpRequest(c.endpoint)
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rtchan := make(chan roundTripResponse, 1)
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go func() {
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resp, err := c.transport.RoundTrip(req)
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rtchan <- roundTripResponse{resp: resp, err: err}
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close(rtchan)
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}()
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var resp *http.Response
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var err error
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select {
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case rtresp := <-rtchan:
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resp, err = rtresp.resp, rtresp.err
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case <-ctx.Done():
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c.transport.CancelRequest(req)
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// wait for request to actually exit before continuing
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<-rtchan
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err = ctx.Err()
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}
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// always check for resp nil-ness to deal with possible
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// race conditions between channels above
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defer func() {
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if resp != nil {
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resp.Body.Close()
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}
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}()
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if err != nil {
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return nil, nil, err
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}
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body, err := ioutil.ReadAll(resp.Body)
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return resp, body, err
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}
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func (c *httpClient) Watch(key string, idx uint64) *httpWatcher {
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return &httpWatcher{
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httpClient: *c,
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nextWait: waitAction{
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Key: key,
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WaitIndex: idx,
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Recursive: false,
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},
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}
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}
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func (c *httpClient) RecursiveWatch(key string, idx uint64) *httpWatcher {
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return &httpWatcher{
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httpClient: *c,
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nextWait: waitAction{
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Key: key,
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WaitIndex: idx,
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Recursive: true,
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},
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}
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}
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type httpWatcher struct {
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httpClient
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nextWait waitAction
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}
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func (hw *httpWatcher) Next() (*Response, error) {
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httpresp, body, err := hw.httpClient.do(context.Background(), &hw.nextWait)
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if err != nil {
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return nil, err
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}
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resp, err := unmarshalHTTPResponse(httpresp.StatusCode, body)
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if err != nil {
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return nil, err
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}
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hw.nextWait.WaitIndex = resp.Node.ModifiedIndex + 1
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return resp, nil
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}
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func v2URL(ep url.URL, key string) *url.URL {
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ep.Path = path.Join(ep.Path, v2Prefix, key)
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return &ep
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}
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type httpAction interface {
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httpRequest(url.URL) *http.Request
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}
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type getAction struct {
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Key string
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Recursive bool
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}
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func (g *getAction) httpRequest(ep url.URL) *http.Request {
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u := v2URL(ep, g.Key)
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params := u.Query()
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params.Set("recursive", strconv.FormatBool(g.Recursive))
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u.RawQuery = params.Encode()
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req, _ := http.NewRequest("GET", u.String(), nil)
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return req
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}
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type waitAction struct {
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Key string
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WaitIndex uint64
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Recursive bool
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}
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func (w *waitAction) httpRequest(ep url.URL) *http.Request {
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u := v2URL(ep, w.Key)
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params := u.Query()
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params.Set("wait", "true")
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params.Set("waitIndex", strconv.FormatUint(w.WaitIndex, 10))
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params.Set("recursive", strconv.FormatBool(w.Recursive))
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u.RawQuery = params.Encode()
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req, _ := http.NewRequest("GET", u.String(), nil)
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return req
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}
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type createAction struct {
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Key string
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Value string
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TTL *uint64
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}
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func (c *createAction) httpRequest(ep url.URL) *http.Request {
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u := v2URL(ep, c.Key)
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params := u.Query()
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params.Set("prevExist", "false")
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u.RawQuery = params.Encode()
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form := url.Values{}
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form.Add("value", c.Value)
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if c.TTL != nil {
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form.Add("ttl", strconv.FormatUint(*c.TTL, 10))
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}
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body := strings.NewReader(form.Encode())
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req, _ := http.NewRequest("PUT", u.String(), body)
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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return req
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}
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func unmarshalHTTPResponse(code int, body []byte) (res *Response, err error) {
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switch code {
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case http.StatusOK, http.StatusCreated:
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res, err = unmarshalSuccessfulResponse(body)
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default:
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err = unmarshalErrorResponse(code)
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}
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return
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}
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func unmarshalSuccessfulResponse(body []byte) (*Response, error) {
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var res Response
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err := json.Unmarshal(body, &res)
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if err != nil {
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return nil, err
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}
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return &res, nil
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}
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func unmarshalErrorResponse(code int) error {
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switch code {
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case http.StatusNotFound:
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return ErrKeyNoExist
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case http.StatusPreconditionFailed:
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return ErrKeyExists
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case http.StatusInternalServerError:
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// this isn't necessarily true
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return ErrNoLeader
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default:
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}
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return fmt.Errorf("unrecognized HTTP status code %d", code)
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}
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464
client/http_test.go
Normal file
464
client/http_test.go
Normal file
@ -0,0 +1,464 @@
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package client
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"reflect"
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"strings"
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"testing"
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"time"
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"github.com/coreos/etcd/third_party/code.google.com/p/go.net/context"
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)
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func TestV2URLHelper(t *testing.T) {
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tests := []struct {
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endpoint url.URL
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key string
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want url.URL
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}{
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// key is empty, no problem
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{
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endpoint: url.URL{Scheme: "http", Host: "example.com", Path: ""},
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key: "",
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want: url.URL{Scheme: "http", Host: "example.com", Path: "/v2/keys"},
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},
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// key is joined to path
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{
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endpoint: url.URL{Scheme: "http", Host: "example.com", Path: ""},
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key: "/foo/bar",
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want: url.URL{Scheme: "http", Host: "example.com", Path: "/v2/keys/foo/bar"},
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},
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// Host field carries through with port
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{
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endpoint: url.URL{Scheme: "http", Host: "example.com:8080", Path: ""},
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key: "",
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want: url.URL{Scheme: "http", Host: "example.com:8080", Path: "/v2/keys"},
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},
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// Scheme carries through
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{
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endpoint: url.URL{Scheme: "https", Host: "example.com", Path: ""},
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key: "",
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want: url.URL{Scheme: "https", Host: "example.com", Path: "/v2/keys"},
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},
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// Path on endpoint is not ignored
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{
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endpoint: url.URL{Scheme: "https", Host: "example.com", Path: "/prefix"},
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key: "/foo",
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want: url.URL{Scheme: "https", Host: "example.com", Path: "/prefix/v2/keys/foo"},
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},
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}
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for i, tt := range tests {
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got := v2URL(tt.endpoint, tt.key)
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if tt.want != *got {
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t.Errorf("#%d: want=%#v, got=%#v", i, tt.want, *got)
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}
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}
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}
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func TestGetAction(t *testing.T) {
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ep := url.URL{Scheme: "http", Host: "example.com"}
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wantURL := &url.URL{
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Scheme: "http",
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Host: "example.com",
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Path: "/v2/keys/foo/bar",
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}
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wantHeader := http.Header{}
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tests := []struct {
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recursive bool
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wantQuery string
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}{
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{
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recursive: false,
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wantQuery: "recursive=false",
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},
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{
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recursive: true,
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wantQuery: "recursive=true",
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},
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}
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for i, tt := range tests {
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f := getAction{
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Key: "/foo/bar",
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Recursive: tt.recursive,
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}
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got := *f.httpRequest(ep)
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wantURL := wantURL
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wantURL.RawQuery = tt.wantQuery
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err := assertResponse(got, wantURL, wantHeader, nil)
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if err != nil {
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t.Errorf("%#d: %v", i, err)
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}
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}
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}
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func TestWaitAction(t *testing.T) {
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ep := url.URL{Scheme: "http", Host: "example.com"}
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wantURL := &url.URL{
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Scheme: "http",
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Host: "example.com",
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Path: "/v2/keys/foo/bar",
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}
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wantHeader := http.Header{}
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tests := []struct {
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waitIndex uint64
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recursive bool
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wantQuery string
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}{
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{
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recursive: false,
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waitIndex: uint64(0),
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wantQuery: "recursive=false&wait=true&waitIndex=0",
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},
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{
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recursive: false,
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waitIndex: uint64(12),
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wantQuery: "recursive=false&wait=true&waitIndex=12",
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},
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{
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recursive: true,
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waitIndex: uint64(12),
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wantQuery: "recursive=true&wait=true&waitIndex=12",
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},
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}
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for i, tt := range tests {
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f := waitAction{
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Key: "/foo/bar",
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WaitIndex: tt.waitIndex,
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Recursive: tt.recursive,
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}
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got := *f.httpRequest(ep)
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wantURL := wantURL
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wantURL.RawQuery = tt.wantQuery
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err := assertResponse(got, wantURL, wantHeader, nil)
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if err != nil {
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t.Errorf("%#d: %v", i, err)
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}
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}
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}
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func TestCreateAction(t *testing.T) {
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ep := url.URL{Scheme: "http", Host: "example.com"}
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wantURL := &url.URL{
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Scheme: "http",
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Host: "example.com",
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Path: "/v2/keys/foo/bar",
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RawQuery: "prevExist=false",
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}
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wantHeader := http.Header(map[string][]string{
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"Content-Type": []string{"application/x-www-form-urlencoded"},
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})
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ttl12 := uint64(12)
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tests := []struct {
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value string
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ttl *uint64
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wantBody string
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}{
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{
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value: "baz",
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wantBody: "value=baz",
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},
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{
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value: "baz",
|
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ttl: &ttl12,
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wantBody: "ttl=12&value=baz",
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},
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}
|
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|
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for i, tt := range tests {
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f := createAction{
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Key: "/foo/bar",
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Value: tt.value,
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TTL: tt.ttl,
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}
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got := *f.httpRequest(ep)
|
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err := assertResponse(got, wantURL, wantHeader, []byte(tt.wantBody))
|
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if err != nil {
|
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t.Errorf("%#d: %v", i, err)
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}
|
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}
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}
|
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func assertResponse(got http.Request, wantURL *url.URL, wantHeader http.Header, wantBody []byte) error {
|
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if !reflect.DeepEqual(wantURL, got.URL) {
|
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return fmt.Errorf("want.URL=%#v got.URL=%#v", wantURL, got.URL)
|
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}
|
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|
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if !reflect.DeepEqual(wantHeader, got.Header) {
|
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return fmt.Errorf("want.Header=%#v got.Header=%#v", wantHeader, got.Header)
|
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}
|
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|
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if got.Body == nil {
|
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if wantBody != nil {
|
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return fmt.Errorf("want.Body=%v got.Body=%v", wantBody, got.Body)
|
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}
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} else {
|
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if wantBody == nil {
|
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return fmt.Errorf("want.Body=%v got.Body=%v", wantBody, got.Body)
|
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} else {
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gotBytes, err := ioutil.ReadAll(got.Body)
|
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if err != nil {
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return err
|
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}
|
||||
|
||||
if !reflect.DeepEqual(wantBody, gotBytes) {
|
||||
return fmt.Errorf("want.Body=%v got.Body=%v", wantBody, gotBytes)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func TestUnmarshalSuccessfulResponse(t *testing.T) {
|
||||
tests := []struct {
|
||||
body string
|
||||
res *Response
|
||||
expectError bool
|
||||
}{
|
||||
// Neither PrevNode or Node
|
||||
{
|
||||
`{"action":"delete"}`,
|
||||
&Response{Action: "delete"},
|
||||
false,
|
||||
},
|
||||
|
||||
// PrevNode
|
||||
{
|
||||
`{"action":"delete", "prevNode": {"key": "/foo", "value": "bar", "modifiedIndex": 12, "createdIndex": 10}}`,
|
||||
&Response{Action: "delete", PrevNode: &Node{Key: "/foo", Value: "bar", ModifiedIndex: 12, CreatedIndex: 10}},
|
||||
false,
|
||||
},
|
||||
|
||||
// Node
|
||||
{
|
||||
`{"action":"get", "node": {"key": "/foo", "value": "bar", "modifiedIndex": 12, "createdIndex": 10}}`,
|
||||
&Response{Action: "get", Node: &Node{Key: "/foo", Value: "bar", ModifiedIndex: 12, CreatedIndex: 10}},
|
||||
false,
|
||||
},
|
||||
|
||||
// PrevNode and Node
|
||||
{
|
||||
`{"action":"update", "prevNode": {"key": "/foo", "value": "baz", "modifiedIndex": 10, "createdIndex": 10}, "node": {"key": "/foo", "value": "bar", "modifiedIndex": 12, "createdIndex": 10}}`,
|
||||
&Response{Action: "update", PrevNode: &Node{Key: "/foo", Value: "baz", ModifiedIndex: 10, CreatedIndex: 10}, Node: &Node{Key: "/foo", Value: "bar", ModifiedIndex: 12, CreatedIndex: 10}},
|
||||
false,
|
||||
},
|
||||
|
||||
// Garbage in body
|
||||
{
|
||||
`garbage`,
|
||||
nil,
|
||||
true,
|
||||
},
|
||||
}
|
||||
|
||||
for i, tt := range tests {
|
||||
res, err := unmarshalSuccessfulResponse([]byte(tt.body))
|
||||
if tt.expectError != (err != nil) {
|
||||
t.Errorf("#%d: expectError=%t, err=%v", i, tt.expectError, err)
|
||||
}
|
||||
|
||||
if (res == nil) != (tt.res == nil) {
|
||||
t.Errorf("#%d: received res==%v, but expected res==%v", i, res, tt.res)
|
||||
continue
|
||||
} else if tt.res == nil {
|
||||
// expected and succesfully got nil response
|
||||
continue
|
||||
}
|
||||
|
||||
if res.Action != tt.res.Action {
|
||||
t.Errorf("#%d: Action=%s, expected %s", i, res.Action, tt.res.Action)
|
||||
}
|
||||
|
||||
if !reflect.DeepEqual(res.Node, tt.res.Node) {
|
||||
t.Errorf("#%d: Node=%v, expected %v", i, res.Node, tt.res.Node)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestUnmarshalErrorResponse(t *testing.T) {
|
||||
unrecognized := errors.New("test fixture")
|
||||
|
||||
tests := []struct {
|
||||
code int
|
||||
want error
|
||||
}{
|
||||
{http.StatusBadRequest, unrecognized},
|
||||
{http.StatusUnauthorized, unrecognized},
|
||||
{http.StatusPaymentRequired, unrecognized},
|
||||
{http.StatusForbidden, unrecognized},
|
||||
{http.StatusNotFound, ErrKeyNoExist},
|
||||
{http.StatusMethodNotAllowed, unrecognized},
|
||||
{http.StatusNotAcceptable, unrecognized},
|
||||
{http.StatusProxyAuthRequired, unrecognized},
|
||||
{http.StatusRequestTimeout, unrecognized},
|
||||
{http.StatusConflict, unrecognized},
|
||||
{http.StatusGone, unrecognized},
|
||||
{http.StatusLengthRequired, unrecognized},
|
||||
{http.StatusPreconditionFailed, ErrKeyExists},
|
||||
{http.StatusRequestEntityTooLarge, unrecognized},
|
||||
{http.StatusRequestURITooLong, unrecognized},
|
||||
{http.StatusUnsupportedMediaType, unrecognized},
|
||||
{http.StatusRequestedRangeNotSatisfiable, unrecognized},
|
||||
{http.StatusExpectationFailed, unrecognized},
|
||||
{http.StatusTeapot, unrecognized},
|
||||
|
||||
{http.StatusInternalServerError, ErrNoLeader},
|
||||
{http.StatusNotImplemented, unrecognized},
|
||||
{http.StatusBadGateway, unrecognized},
|
||||
{http.StatusServiceUnavailable, unrecognized},
|
||||
{http.StatusGatewayTimeout, unrecognized},
|
||||
{http.StatusHTTPVersionNotSupported, unrecognized},
|
||||
}
|
||||
|
||||
for i, tt := range tests {
|
||||
want := tt.want
|
||||
if reflect.DeepEqual(unrecognized, want) {
|
||||
want = fmt.Errorf("unrecognized HTTP status code %d", tt.code)
|
||||
}
|
||||
|
||||
got := unmarshalErrorResponse(tt.code)
|
||||
if !reflect.DeepEqual(want, got) {
|
||||
t.Errorf("#%d: want=%v, got=%v", i, want, got)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
type fakeTransport struct {
|
||||
respchan chan *http.Response
|
||||
errchan chan error
|
||||
startCancel chan struct{}
|
||||
finishCancel chan struct{}
|
||||
}
|
||||
|
||||
func newFakeTransport() *fakeTransport {
|
||||
return &fakeTransport{
|
||||
respchan: make(chan *http.Response, 1),
|
||||
errchan: make(chan error, 1),
|
||||
startCancel: make(chan struct{}, 1),
|
||||
finishCancel: make(chan struct{}, 1),
|
||||
}
|
||||
}
|
||||
|
||||
func (t *fakeTransport) RoundTrip(*http.Request) (*http.Response, error) {
|
||||
select {
|
||||
case resp := <-t.respchan:
|
||||
return resp, nil
|
||||
case err := <-t.errchan:
|
||||
return nil, err
|
||||
case <-t.startCancel:
|
||||
// wait on finishCancel to simulate taking some amount of
|
||||
// time while calling CancelRequest
|
||||
<-t.finishCancel
|
||||
return nil, errors.New("cancelled")
|
||||
}
|
||||
}
|
||||
|
||||
func (t *fakeTransport) CancelRequest(*http.Request) {
|
||||
t.startCancel <- struct{}{}
|
||||
}
|
||||
|
||||
type fakeAction struct{}
|
||||
|
||||
func (a *fakeAction) httpRequest(url.URL) *http.Request {
|
||||
return &http.Request{}
|
||||
}
|
||||
|
||||
func TestHTTPClientDoSuccess(t *testing.T) {
|
||||
tr := newFakeTransport()
|
||||
c := &httpClient{transport: tr}
|
||||
|
||||
tr.respchan <- &http.Response{
|
||||
StatusCode: http.StatusTeapot,
|
||||
Body: ioutil.NopCloser(strings.NewReader("foo")),
|
||||
}
|
||||
|
||||
resp, body, err := c.do(context.Background(), &fakeAction{})
|
||||
if err != nil {
|
||||
t.Fatalf("incorrect error value: want=nil got=%v", err)
|
||||
}
|
||||
|
||||
wantCode := http.StatusTeapot
|
||||
if wantCode != resp.StatusCode {
|
||||
t.Fatalf("invalid response code: want=%d got=%d", wantCode, resp.StatusCode)
|
||||
}
|
||||
|
||||
wantBody := []byte("foo")
|
||||
if !reflect.DeepEqual(wantBody, body) {
|
||||
t.Fatalf("invalid response body: want=%q got=%q", wantBody, body)
|
||||
}
|
||||
}
|
||||
|
||||
func TestHTTPClientDoError(t *testing.T) {
|
||||
tr := newFakeTransport()
|
||||
c := &httpClient{transport: tr}
|
||||
|
||||
tr.errchan <- errors.New("fixture")
|
||||
|
||||
_, _, err := c.do(context.Background(), &fakeAction{})
|
||||
if err == nil {
|
||||
t.Fatalf("expected non-nil error, got nil")
|
||||
}
|
||||
}
|
||||
|
||||
func TestHTTPClientDoCancelContext(t *testing.T) {
|
||||
tr := newFakeTransport()
|
||||
c := &httpClient{transport: tr}
|
||||
|
||||
tr.startCancel <- struct{}{}
|
||||
tr.finishCancel <- struct{}{}
|
||||
|
||||
_, _, err := c.do(context.Background(), &fakeAction{})
|
||||
if err == nil {
|
||||
t.Fatalf("expected non-nil error, got nil")
|
||||
}
|
||||
}
|
||||
|
||||
func TestHTTPClientDoCancelContextWaitForRoundTrip(t *testing.T) {
|
||||
tr := newFakeTransport()
|
||||
c := &httpClient{transport: tr}
|
||||
|
||||
donechan := make(chan struct{})
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
go func() {
|
||||
c.do(ctx, &fakeAction{})
|
||||
close(donechan)
|
||||
}()
|
||||
|
||||
// This should call CancelRequest and begin the cancellation process
|
||||
cancel()
|
||||
|
||||
select {
|
||||
case <-donechan:
|
||||
t.Fatalf("httpClient.do should not have exited yet")
|
||||
default:
|
||||
}
|
||||
|
||||
tr.finishCancel <- struct{}{}
|
||||
|
||||
select {
|
||||
case <-donechan:
|
||||
//expected behavior
|
||||
return
|
||||
case <-time.After(time.Second):
|
||||
t.Fatalf("httpClient.do did not exit within 1s")
|
||||
}
|
||||
}
|
||||
2
test
2
test
@ -14,7 +14,7 @@ COVER=${COVER:-"-cover"}
|
||||
|
||||
source ./build
|
||||
|
||||
TESTABLE="etcdserver etcdserver/etcdhttp etcdserver/etcdserverpb functional proxy raft snap store wait wal ./"
|
||||
TESTABLE="client etcdserver etcdserver/etcdhttp etcdserver/etcdserverpb functional proxy raft snap store wait wal ./"
|
||||
FORMATTABLE="$TESTABLE cors.go"
|
||||
|
||||
# user has not provided PKG override
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user