Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

support error in context of response #781

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

support error in context of response #781

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
83 changes: 59 additions & 24 deletions colly.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -140,19 +140,19 @@ type Collector struct {
type RequestCallback func(*Request)

// ResponseHeadersCallback is a type alias for OnResponseHeaders callback functions
type ResponseHeadersCallback func(*Response)
type ResponseHeadersCallback func(*Response) error

// ResponseCallback is a type alias for OnResponse callback functions
type ResponseCallback func(*Response)
type ResponseCallback func(*Response) error

// HTMLCallback is a type alias for OnHTML callback functions
type HTMLCallback func(*HTMLElement)
type HTMLCallback func(*HTMLElement) error

// XMLCallback is a type alias for OnXML callback functions
type XMLCallback func(*XMLElement)
type XMLCallback func(*XMLElement) error

// ErrorCallback is a type alias for OnError callback functions
type ErrorCallback func(*Response, error)
type ErrorCallback func(*Response, error) error

// ScrapedCallback is a type alias for OnScraped callback functions
type ScrapedCallback func(*Response)
Expand Down Expand Up @@ -691,13 +691,18 @@ func (c *Collector) fetch(u, method string, depth int, requestData io.Reader, ct
req = hTrace.WithTrace(req)
}
origURL := req.URL
checkHeadersFunc := func(req *http.Request, statusCode int, headers http.Header) bool {
checkHeadersFunc := func(req *http.Request, statusCode int, headers http.Header) error {
if req.URL != origURL {
request.URL = req.URL
request.Headers = &req.Header
}
c.handleOnResponseHeaders(&Response{Ctx: ctx, Request: request, StatusCode: statusCode, Headers: &headers})
return !request.abort
if err := c.handleOnResponseHeaders(&Response{Ctx: ctx, Request: request, StatusCode: statusCode, Headers: &headers}); err != nil {
return err
}
if request.abort {
return ErrAbortedAfterHeaders
}
return nil
}
response, err := c.backend.Cache(req, c.MaxBodySize, checkHeadersFunc, c.CacheDir)
if proxyURL, ok := req.Context().Value(ProxyURLKey).(string); ok {
Expand All @@ -716,16 +721,24 @@ func (c *Collector) fetch(u, method string, depth int, requestData io.Reader, ct
return err
}

c.handleOnResponse(response)
if err := c.handleOnResponse(response); err != nil {
if err = c.handleOnError(response, err, request, ctx); err != nil {
return err
}
}

err = c.handleOnHTML(response)
if err != nil {
c.handleOnError(response, err, request, ctx)
if err = c.handleOnError(response, err, request, ctx); err != nil {
return err
}
}

err = c.handleOnXML(response)
if err != nil {
c.handleOnError(response, err, request, ctx)
if err = c.handleOnError(response, err, request, ctx); err != nil {
return err
}
}

c.handleOnScraped(response)
Expand Down Expand Up @@ -1083,37 +1096,43 @@ func (c *Collector) handleOnRequest(r *Request) {
}
}

func (c *Collector) handleOnResponse(r *Response) {
func (c *Collector) handleOnResponse(r *Response) error {
if c.debugger != nil {
c.debugger.Event(createEvent("response", r.Request.ID, c.ID, map[string]string{
"url": r.Request.URL.String(),
"status": http.StatusText(r.StatusCode),
}))
}
for _, f := range c.responseCallbacks {
f(r)
if err := f(r); err != nil {
return err
}
}
return nil
}

func (c *Collector) handleOnResponseHeaders(r *Response) {
func (c *Collector) handleOnResponseHeaders(r *Response) error {
if c.debugger != nil {
c.debugger.Event(createEvent("responseHeaders", r.Request.ID, c.ID, map[string]string{
"url": r.Request.URL.String(),
"status": http.StatusText(r.StatusCode),
}))
}
for _, f := range c.responseHeadersCallbacks {
f(r)
if err := f(r); err != nil {
return err
}
}
return nil
}

func (c *Collector) handleOnHTML(resp *Response) error {
func (c *Collector) handleOnHTML(resp *Response) (err error) {
if len(c.htmlCallbacks) == 0 || !strings.Contains(strings.ToLower(resp.Headers.Get("Content-Type")), "html") {
return nil
}
doc, err := goquery.NewDocumentFromReader(bytes.NewBuffer(resp.Body))
if err != nil {
return err
return
}
if href, found := doc.Find("base[href]").Attr("href"); found {
u, err := urlParser.ParseRef(resp.Request.URL.String(), href)
Expand All @@ -1127,7 +1146,7 @@ func (c *Collector) handleOnHTML(resp *Response) error {
}
for _, cc := range c.htmlCallbacks {
i := 0
doc.Find(cc.Selector).Each(func(_ int, s *goquery.Selection) {
doc.Find(cc.Selector).EachWithBreak(func(_ int, s *goquery.Selection) bool {
for _, n := range s.Nodes {
e := NewHTMLElementFromSelectionNode(resp, s, n, i)
i++
Expand All @@ -1137,11 +1156,17 @@ func (c *Collector) handleOnHTML(resp *Response) error {
"url": resp.Request.URL.String(),
}))
}
cc.Function(e)
if err = cc.Function(e); err != nil {
return false
}
}
return true
})
if err != nil {
return
}
}
return nil
return
}

func (c *Collector) handleOnXML(resp *Response) error {
Expand Down Expand Up @@ -1180,7 +1205,9 @@ func (c *Collector) handleOnXML(resp *Response) error {
"url": resp.Request.URL.String(),
}))
}
cc.Function(e)
if err := cc.Function(e); err != nil {
return err
}
}
}
} else if strings.Contains(contentType, "xml") || isXMLFile {
Expand All @@ -1198,8 +1225,11 @@ func (c *Collector) handleOnXML(resp *Response) error {
"url": resp.Request.URL.String(),
}))
}
cc.Function(e)
err = cc.Function(e)
})
if err != nil {
return err
}
}
}
return nil
Expand Down Expand Up @@ -1230,10 +1260,15 @@ func (c *Collector) handleOnError(response *Response, err error, request *Reques
if response.Ctx == nil {
response.Ctx = request.Ctx
}
if len(c.errorCallbacks) < 1 {
return err
}
for _, f := range c.errorCallbacks {
f(response, err)
if abortErr := f(response, err); abortErr != nil {
return abortErr
}
}
return err
return nil
}

func (c *Collector) handleOnScraped(r *Response) {
Expand Down
Loading