Add initial discovery service client
parent
275eab6994
commit
59c01424dd
@ -0,0 +1,66 @@
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// Package disco controls interaction with the rqlite Discovery service
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package disco
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import (
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"bytes"
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"encoding/json"
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"errors"
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"io/ioutil"
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"net/http"
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"runtime"
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)
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type Nodes []string
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// Client provides a Discovery Service client.
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type Client struct {
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url string
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}
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// New returns an uninitialized Discovery Service client.
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func New(url string) *Client {
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return &Client{
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url: url,
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}
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}
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// URL returns the Discovery Service URL used by this client.
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func (c *Client) URL() string {
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return c.url
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}
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// Register attempts to register with the Discovery Service, using the given
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// address.
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func (c *Client) Register(addr string) (Nodes, error) {
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m := map[string]string{
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"addr": addr,
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"GOOS": runtime.GOOS,
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"GOARCH": runtime.GOARCH,
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}
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b, err := json.Marshal(m)
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if err != nil {
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return nil, err
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}
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resp, err := http.Post(c.url, "application-type/json", bytes.NewReader(b))
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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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b, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusOK {
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return nil, errors.New(resp.Status)
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}
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nodes := Nodes{}
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if err := json.Unmarshal(b, &nodes); err != nil {
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return nil, err
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}
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return nodes, nil
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}
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@ -0,0 +1,176 @@
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package disco
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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/http/httptest"
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"runtime"
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"testing"
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)
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func Test_NewClient(t *testing.T) {
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c := New("https://discovery.rqlite.com")
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if c == nil {
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t.Fatal("failed to create new disco client")
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}
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if c.URL() != "https://discovery.rqlite.com" {
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t.Fatal("configured address of disco service is incorrect")
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}
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}
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func Test_ClientRegisterBadRequest(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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w.WriteHeader(http.StatusBadRequest)
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}))
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defer ts.Close()
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c := New(ts.URL)
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_, err := c.Register("http://127.0.0.1")
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if err == nil {
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t.Fatalf("failed to receive error on 400 from server")
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}
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}
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func Test_ClientRegisterNotFound(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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w.WriteHeader(http.StatusNotFound)
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}))
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defer ts.Close()
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c := New(ts.URL)
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_, err := c.Register("http://127.0.0.1")
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if err == nil {
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t.Fatalf("failed to receive error on 404 from server")
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}
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}
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func Test_ClientRegisterForbidden(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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w.WriteHeader(http.StatusForbidden)
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}))
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defer ts.Close()
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c := New(ts.URL)
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_, err := c.Register("http://127.0.0.1")
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if err == nil {
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t.Fatalf("failed to receive error on 403 from server")
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}
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}
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func Test_ClientRegisterRequestOK(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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b, err := ioutil.ReadAll(r.Body)
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if err != nil {
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t.Fatalf("failed to read request from client: %s", err.Error())
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}
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m := map[string]string{}
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if err := json.Unmarshal(b, &m); err != nil {
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t.Fatalf("failed to unmarshal request from client: %s", err.Error())
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}
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if m["addr"] != "http://127.0.0.1" {
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t.Fatalf("incorrect join address supplied by client: %s", m["addr"])
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}
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if m["GOOS"] != runtime.GOOS {
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t.Fatalf("incorrect GOOS supplied by client: %s", m["GOOS"])
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}
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if m["GOARCH"] != runtime.GOARCH {
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t.Fatalf("incorrect GOOS supplied by client: %s", m["GOARCH"])
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}
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fmt.Fprintln(w, `[]`)
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}))
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defer ts.Close()
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c := New(ts.URL)
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nodes, err := c.Register("http://127.0.0.1")
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if err != nil {
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t.Fatalf("failed to register: %s", err.Error())
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}
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if len(nodes) != 0 {
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t.Fatalf("failed to receive empty list of nodes, got %v", nodes)
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}
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}
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func Test_ClientRegisterLeaderOK(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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fmt.Fprintln(w, `[]`)
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}))
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defer ts.Close()
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c := New(ts.URL)
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nodes, err := c.Register("http://127.0.0.1")
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if err != nil {
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t.Fatalf("failed to register: %s", err.Error())
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}
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if len(nodes) != 0 {
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t.Fatalf("failed to receive empty list of nodes, got %v", nodes)
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}
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}
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func Test_ClientRegisterFollowerOK(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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fmt.Fprintln(w, `["http://1.1.1.1"]`)
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}))
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defer ts.Close()
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c := New(ts.URL)
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nodes, err := c.Register("http://2.2.2.2")
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if err != nil {
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t.Fatalf("failed to register: %s", err.Error())
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}
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if len(nodes) != 1 {
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t.Fatalf("failed to receive non-empty list of nodes")
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}
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if nodes[0] != `http://1.1.1.1` {
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t.Fatalf("got incorrect node, got %v", nodes[0])
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}
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}
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func Test_ClientRegisterFollowerMultiOK(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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t.Fatalf("Client did not use POST")
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}
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fmt.Fprintln(w, `["http://1.1.1.1", "http://2.2.2.2"]`)
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}))
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defer ts.Close()
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c := New(ts.URL)
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nodes, err := c.Register("http://3.3.3.3")
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if err != nil {
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t.Fatalf("failed to register: %s", err.Error())
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}
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if len(nodes) != 2 {
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t.Fatalf("failed to receive non-empty list of nodes")
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}
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if nodes[0] != `http://1.1.1.1` {
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t.Fatalf("got incorrect first node, got %v", nodes[0])
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}
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if nodes[1] != `http://2.2.2.2` {
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t.Fatalf("got incorrect second node, got %v", nodes[1])
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}
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}
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