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crawler_test.go
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package crawler
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"net/http/httptest"
"net/url"
"regexp"
"strings"
"sync"
"testing"
"time"
)
func newTestWorker() *Worker {
host, _ := url.Parse("http://example.com")
return &Worker{
GetFunc: func(url *url.URL) (io.ReadCloser, error) {
data := "<html><head></head><body></body></html>"
return ioutil.NopCloser(strings.NewReader(data)), nil
},
Host: host,
Concurrent: 8,
}
}
func TestWorkerClose(t *testing.T) {
t.Parallel()
wg := &sync.WaitGroup{}
want := 10
w := &worker{
wg: wg,
work: make(chan *url.URL),
w: newTestWorker(),
}
wg.Add(1)
go w.run()
for i := 0; i < want; i++ {
u, _ := url.Parse(fmt.Sprintf("http://example.com/site%d", i))
w.work <- u
}
close(w.work)
wg.Wait()
if !w.closed {
t.Fatalf("worker: expected closed worker")
}
if w.done != want {
t.Fatalf("worker: expected %d crawled url, got %d", want, w.done)
}
}
func TestCrawlerClose(t *testing.T) {
t.Parallel()
c := New(newTestWorker(), time.Millisecond*2, nil)
time.Sleep(time.Millisecond * 5)
<-c.Done()
for _, w := range c.worker {
if !w.closed {
t.Fatalf("crawler: expected closed worker")
}
}
u, _ := url.Parse("http://example.com")
if err := c.queue.Push(u); err != ErrQueueClosed {
t.Fatalf("crawler: expected ErrQueueClosed, got %v", err)
}
}
func TestCrawlerManualClose(t *testing.T) {
t.Parallel()
c := New(newTestWorker(), time.Hour*2, nil)
if err := c.Close(); err != nil {
t.Fatalf("crawler: cannot close: %v", err)
}
_, ok := <-c.Done()
if ok != false {
t.Fatalf("crawler: unexpected open done channel")
}
}
func TestAcceptFunc(t *testing.T) {
reject := []*regexp.Regexp{
regexp.MustCompile("http://example.com/index.html"),
regexp.MustCompile("http://example.com/notwant*"),
}
accept := []*regexp.Regexp{
regexp.MustCompile(`http://example.com/site1\.html`),
regexp.MustCompile(`http://example.com/site2\.html`),
regexp.MustCompile("http://example.com/index1*"),
}
// test reject
for _, urlStr := range []string{
"http://google.com",
"http://example.com/index.html",
"http://example.com/notwant",
"http://example.com/notwant1",
"http://example.com/notwant2",
"http://example.com/site3.html",
} {
u, _ := url.Parse(urlStr)
if Accept(u, "example.com", reject, accept) {
t.Fatalf("accept %q: expected false, got true", urlStr)
}
}
// test accept all
for _, urlStr := range []string{
"http://example.com/site1.html",
"http://example.com/xnotwan",
"http://example.com/index1.html",
} {
u, _ := url.Parse(urlStr)
if !Accept(u, "example.com", reject, nil) {
t.Fatalf("accept %q: expected true, got false", urlStr)
}
}
// test accept
for _, urlStr := range []string{
"http://example.com/site1.html",
"http://example.com/site2.html",
"http://example.com/index1.html",
} {
u, _ := url.Parse(urlStr)
if !Accept(u, "example.com", reject, accept) {
t.Fatalf("accept %q: expected true, got false", urlStr)
}
}
}
func startGetServer(t *testing.T) *httptest.Server {
h := func(w http.ResponseWriter, req *http.Request) {
if req.URL.Path == "/index" {
w.Write([]byte("hello world"))
return
} else if req.URL.Path == "/404" {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("not found"))
return
}
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("bad request"))
}
return httptest.NewServer(http.HandlerFunc(h))
}
func TestGetFunc(t *testing.T) {
t.Parallel()
s := startGetServer(t)
defer s.Close()
u, _ := url.Parse(s.URL)
u.Path = "/index"
body, err := Get(u, "agent", nil)
if err != nil {
t.Fatalf("get: expected <nil> error, got %v", err)
}
data, err := ioutil.ReadAll(body)
if err != nil {
t.Fatalf("get: read body: %v", err)
}
if string(data) != "hello world" {
t.Fatalf("get: expected \"hello world\", got %q", data)
}
u.Path = "/404"
if body, err = Get(u, "agent", nil); err == nil {
t.Fatalf("get: expected 404 Not Found, got <nil>")
}
if err.Error() != "404 Not Found" {
t.Fatalf("get: expected 404 Not Found, got %v", err)
}
if body != nil {
t.Fatalf("get: expected <nil> body")
}
u.Path = "xxx"
if _, err = Get(u, "agent", nil); err == nil {
t.Fatalf("get: expected 400 Bad Request, got <nil>")
}
if err.Error() != "400 Bad Request" {
t.Fatalf("get: expected 400 Bad Request, got %v", err)
}
if body != nil {
t.Fatalf("get: expected <nil> body")
}
}