65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package accesslog
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import (
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"net/http"
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"time"
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"github.com/vulcand/oxy/utils"
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)
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// FieldApply function hook to add data in accesslog.
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type FieldApply func(rw http.ResponseWriter, r *http.Request, next http.Handler, data *LogData)
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// FieldHandler sends a new field to the logger.
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type FieldHandler struct {
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next http.Handler
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name string
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value string
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applyFn FieldApply
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}
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// NewFieldHandler creates a Field handler.
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func NewFieldHandler(next http.Handler, name, value string, applyFn FieldApply) http.Handler {
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return &FieldHandler{next: next, name: name, value: value, applyFn: applyFn}
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}
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func (f *FieldHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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table := GetLogData(req)
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if table == nil {
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f.next.ServeHTTP(rw, req)
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return
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}
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table.Core[f.name] = f.value
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if f.applyFn != nil {
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f.applyFn(rw, req, f.next, table)
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} else {
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f.next.ServeHTTP(rw, req)
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}
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}
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// AddServiceFields add service fields.
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func AddServiceFields(rw http.ResponseWriter, req *http.Request, next http.Handler, data *LogData) {
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data.Core[ServiceURL] = req.URL // note that this is *not* the original incoming URL
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data.Core[ServiceAddr] = req.URL.Host
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next.ServeHTTP(rw, req)
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}
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// AddOriginFields add origin fields.
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func AddOriginFields(rw http.ResponseWriter, req *http.Request, next http.Handler, data *LogData) {
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crw := newCaptureResponseWriter(rw)
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start := time.Now().UTC()
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next.ServeHTTP(crw, req)
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// use UTC to handle switchover of daylight saving correctly
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data.Core[OriginDuration] = time.Now().UTC().Sub(start)
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data.Core[OriginStatus] = crw.Status()
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// make copy of headers so we can ensure there is no subsequent mutation during response processing
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data.OriginResponse = make(http.Header)
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utils.CopyHeaders(data.OriginResponse, crw.Header())
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data.Core[OriginContentSize] = crw.Size()
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}
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