package accesslog import ( "fmt" "net/http" "strings" "time" "github.com/vulcand/oxy/utils" ) // SaveBackend sends the backend name to the logger. These are always used with a corresponding // SaveFrontend handler. type SaveBackend struct { next http.Handler backendName string } // NewSaveBackend creates a SaveBackend handler. func NewSaveBackend(next http.Handler, backendName string) http.Handler { return &SaveBackend{next, backendName} } func (sb *SaveBackend) ServeHTTP(rw http.ResponseWriter, r *http.Request) { table := GetLogDataTable(r) table.Core[BackendName] = sb.backendName table.Core[BackendURL] = r.URL // note that this is *not* the original incoming URL table.Core[BackendAddr] = r.URL.Host crw := &captureResponseWriter{rw: rw} start := time.Now().UTC() sb.next.ServeHTTP(crw, r) // use UTC to handle switchover of daylight saving correctly table.Core[OriginDuration] = time.Now().UTC().Sub(start) table.Core[OriginStatus] = crw.Status() table.Core[OriginStatusLine] = fmt.Sprintf("%03d %s", crw.Status(), http.StatusText(crw.Status())) // make copy of headers so we can ensure there is no subsequent mutation during response processing table.OriginResponse = make(http.Header) utils.CopyHeaders(table.OriginResponse, crw.Header()) table.Core[OriginContentSize] = crw.Size() } //------------------------------------------------------------------------------------------------- // SaveFrontend sends the frontend name to the logger. These are sometimes used with a corresponding // SaveBackend handler, but not always. For example, redirected requests don't reach a backend. type SaveFrontend struct { next http.Handler frontendName string } // NewSaveFrontend creates a SaveFrontend handler. func NewSaveFrontend(next http.Handler, frontendName string) http.Handler { return &SaveFrontend{next, frontendName} } func (sb *SaveFrontend) ServeHTTP(rw http.ResponseWriter, r *http.Request) { table := GetLogDataTable(r) table.Core[FrontendName] = strings.TrimPrefix(sb.frontendName, "frontend-") sb.next.ServeHTTP(rw, r) }