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middleware.go
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middleware.go
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package scihttp
import (
"net/http"
"net/http/httptest"
"github.com/julienschmidt/httprouter"
)
type MiddlewareChainNode interface {
Next(m *Middleware) MiddlewareChainNode
Handler(h httprouter.Handle) httprouter.Handle
}
type Middleware struct {
pipelineRoot *MiddlewarePipeline
preProcess http.HandlerFunc
postProcess http.HandlerFunc
next *Middleware
handler httprouter.Handle
}
func (mdw *Middleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
rec := w.(*httptest.ResponseRecorder)
mdw.preProcess(rec, r)
if mdw.next != nil {
mdw.next.ServeHTTP(rec, r)
} else if (mdw.handler != nil) && (rec.Code == 200) {
params := httprouter.ParamsFromContext(r.Context())
mdw.handler(rec, r, params)
}
mdw.postProcess(rec, r)
}
func (mdw *Middleware) Next(m *Middleware) MiddlewareChainNode {
mdw.next = m
m.pipelineRoot = mdw.pipelineRoot
return mdw.next
}
func (mdw *Middleware) Handler(h httprouter.Handle) httprouter.Handle {
mdw.handler = h
return mdw.pipelineRoot.HandleHTTP
}
type MiddlewarePipeline struct {
firstMiddleware *Middleware
handler httprouter.Handle
}
func (mp *MiddlewarePipeline) HandleHTTP(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
rec := httptest.NewRecorder()
if mp.firstMiddleware != nil {
mp.firstMiddleware.ServeHTTP(rec, r)
} else if mp.handler != nil {
params := httprouter.ParamsFromContext(r.Context())
mp.handler(rec, r, params)
}
for k, v := range rec.Header() {
w.Header()[k] = v
}
w.WriteHeader(rec.Result().StatusCode)
w.Write(rec.Body.Bytes())
}
func (mp *MiddlewarePipeline) Next(m *Middleware) MiddlewareChainNode {
mp.firstMiddleware = m
m.pipelineRoot = mp
return mp.firstMiddleware
}
func (mp *MiddlewarePipeline) Handler(h httprouter.Handle) httprouter.Handle {
mp.handler = h
return mp.HandleHTTP
}
func NewMiddleware(pre http.HandlerFunc, post http.HandlerFunc) *Middleware {
return &Middleware{preProcess: pre, postProcess: post}
}
func NewMiddlewarePipeline() MiddlewareChainNode {
mp := &MiddlewarePipeline{}
return mp
}