/
helpers.go
370 lines (323 loc) · 8.58 KB
/
helpers.go
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package system
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
httpd "github.com/rqlite/rqlite/http"
"github.com/rqlite/rqlite/store"
)
// Node represents a node under test.
type Node struct {
APIAddr string
RaftAddr string
Dir string
Store *store.Store
Service *httpd.Service
}
// SameAs returns true if this node is the same as node o.
func (n *Node) SameAs(o *Node) bool {
return n.RaftAddr == o.RaftAddr
}
// Deprovision shuts down and removes all resources associated with the node.
func (n *Node) Deprovision() {
n.Store.Close(false)
n.Service.Close()
os.RemoveAll(n.Dir)
}
// WaitForLeader blocks for up to 10 seconds until the node detects a leader.
func (n *Node) WaitForLeader() (string, error) {
return n.Store.WaitForLeader(10 * time.Second)
}
// Execute executes a single statement against the node.
func (n *Node) Execute(stmt string) (string, error) {
return n.ExecuteMulti([]string{stmt})
}
// ExecuteMulti executes multiple statements against the node.
func (n *Node) ExecuteMulti(stmts []string) (string, error) {
j, err := json.Marshal(stmts)
if err != nil {
return "", err
}
return n.postExecute(string(j))
}
// Query runs a single query against the node.
func (n *Node) Query(stmt string) (string, error) {
v, _ := url.Parse("http://" + n.APIAddr + "/db/query")
v.RawQuery = url.Values{"q": []string{stmt}}.Encode()
resp, err := http.Get(v.String())
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
// QueryMulti runs multiple queries against the node.
func (n *Node) QueryMulti(stmts []string) (string, error) {
j, err := json.Marshal(stmts)
if err != nil {
return "", err
}
return n.postQuery(string(j))
}
// Join instructs this node to join the leader.
func (n *Node) Join(leader *Node) error {
resp, err := DoJoinRequest(leader.APIAddr, n.RaftAddr)
if err != nil {
return err
}
if resp.StatusCode != 200 {
return fmt.Errorf("failed to join, leader returned: %s", resp.Status)
}
defer resp.Body.Close()
return nil
}
// Status returns the status and diagnostic output for node.
func (n *Node) Status() (string, error) {
v, _ := url.Parse("http://" + n.APIAddr + "/status")
resp, err := http.Get(v.String())
if err != nil {
return "", err
}
if resp.StatusCode != 200 {
return "", fmt.Errorf("status endpoint returned: %s", resp.Status)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
// Expvar returns the expvar output for node.
func (n *Node) Expvar() (string, error) {
v, _ := url.Parse("http://" + n.APIAddr + "/debug/vars")
resp, err := http.Get(v.String())
if err != nil {
return "", err
}
if resp.StatusCode != 200 {
return "", fmt.Errorf("expvar endpoint returned: %s", resp.Status)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
// ConfirmRedirect confirms that the node responds with a redirect to the given host.
func (n *Node) ConfirmRedirect(host string) bool {
v, _ := url.Parse("http://" + n.APIAddr + "/db/query")
v.RawQuery = url.Values{"q": []string{`SELECT * FROM foo`}}.Encode()
resp, err := http.Get(v.String())
if err != nil {
return false
}
defer resp.Body.Close()
fmt.Println(resp.StatusCode)
if resp.StatusCode != http.StatusMovedPermanently {
return false
}
if resp.Header.Get("location") != host {
return false
}
return true
}
func (n *Node) postExecute(stmt string) (string, error) {
resp, err := http.Post("http://"+n.APIAddr+"/db/execute", "application/json", strings.NewReader(stmt))
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
func (n *Node) postQuery(stmt string) (string, error) {
resp, err := http.Post("http://"+n.APIAddr+"/db/query", "application/json", strings.NewReader(stmt))
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(body), nil
}
// Cluster represents a cluster of nodes.
type Cluster []*Node
// Leader returns the leader node of a cluster.
func (c Cluster) Leader() (*Node, error) {
l, err := c[0].WaitForLeader()
if err != nil {
return nil, err
}
return c.FindNodeByRaftAddr(l)
}
// WaitForNewLeader waits for the leader to change from the node passed in.
func (c Cluster) WaitForNewLeader(old *Node) (*Node, error) {
timer := time.NewTimer(30 * time.Second)
defer timer.Stop()
ticker := time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
for {
select {
case <-timer.C:
return nil, fmt.Errorf("timed out waiting for new leader")
case <-ticker.C:
l, err := c.Leader()
if err != nil {
continue
}
if !l.SameAs(old) {
return l, nil
}
}
}
}
// Followers returns the slice of nodes in the cluster that are followers.
func (c Cluster) Followers() ([]*Node, error) {
n, err := c[0].WaitForLeader()
if err != nil {
return nil, err
}
leader, err := c.FindNodeByRaftAddr(n)
if err != nil {
return nil, err
}
var followers []*Node
for _, n := range c {
if n != leader {
followers = append(followers, n)
}
}
return followers, nil
}
// RemoveNode removes the given node from the list of nodes representing
// a cluster.
func (c Cluster) RemoveNode(node *Node) {
for i, n := range c {
if n.RaftAddr == node.RaftAddr {
c = append(c[:i], c[i+1:]...)
return
}
}
}
// FindNodeByRaftAddr returns the node with the given Raft address.
func (c Cluster) FindNodeByRaftAddr(addr string) (*Node, error) {
for _, n := range c {
if n.RaftAddr == addr {
return n, nil
}
}
return nil, fmt.Errorf("node not found")
}
// Deprovision deprovisions every node in the cluster.
func (c Cluster) Deprovision() {
for _, n := range c {
n.Deprovision()
}
}
// Remove tells the cluster at n to remove the node at addr. Assumes n is the leader.
func Remove(n *Node, addr string) error {
b, err := json.Marshal(map[string]string{"addr": addr})
if err != nil {
return err
}
// Attempt to remove node from leader.
resp, err := http.Post("http://"+n.APIAddr+"/remove", "application-type/json", bytes.NewReader(b))
if err != nil {
return err
}
if resp.StatusCode != 200 {
return fmt.Errorf("failed to remove node, leader returned: %s", resp.Status)
}
defer resp.Body.Close()
return nil
}
// DoJoinRequest sends a join request to nodeAddr, for raftAddr.
func DoJoinRequest(nodeAddr, raftAddr string) (*http.Response, error) {
b, err := json.Marshal(map[string]string{"addr": raftAddr})
if err != nil {
return nil, err
}
resp, err := http.Post("http://"+nodeAddr+"/join", "application-type/json", bytes.NewReader(b))
if err != nil {
return nil, err
}
return resp, nil
}
func mustNewNode(enableSingle bool) *Node {
node := &Node{
Dir: mustTempDir(),
}
dbConf := store.NewDBConfig("", false)
node.Store = store.New(&store.StoreConfig{
DBConf: dbConf,
Dir: node.Dir,
Tn: mustMockTransport("localhost:0"),
})
if err := node.Store.Open(enableSingle); err != nil {
node.Deprovision()
panic(fmt.Sprintf("failed to open store: %s", err.Error()))
}
node.RaftAddr = node.Store.Addr().String()
node.Service = httpd.New("localhost:0", node.Store, nil)
node.Service.Expvar = true
if err := node.Service.Start(); err != nil {
node.Deprovision()
panic(fmt.Sprintf("failed to start HTTP server: %s", err.Error()))
}
node.APIAddr = node.Service.Addr().String()
return node
}
func mustNewLeaderNode() *Node {
node := mustNewNode(true)
if _, err := node.WaitForLeader(); err != nil {
node.Deprovision()
panic("node never became leader")
}
return node
}
type mockTransport struct {
ln net.Listener
}
func mustMockTransport(addr string) *mockTransport {
ln, err := net.Listen("tcp", addr)
if err != nil {
panic("failed to create new transport")
}
return &mockTransport{ln}
}
func (m *mockTransport) Dial(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("tcp", addr, timeout)
}
func (m *mockTransport) Accept() (net.Conn, error) { return m.ln.Accept() }
func (m *mockTransport) Close() error { return m.ln.Close() }
func (m *mockTransport) Addr() net.Addr { return m.ln.Addr() }
func mustTempDir() string {
var err error
path, err := ioutil.TempDir("", "rqlilte-system-test-")
if err != nil {
panic("failed to create temp dir")
}
return path
}
func isJSON(s string) bool {
var js map[string]interface{}
return json.Unmarshal([]byte(s), &js) == nil
}