go-Web框架实现01
go-Web框架实现 | 笔记整理!
day01 | 基础实现
方法绑定 | 参考官方实现
http.HandleFunc | go官方文档
会传入两个参数 | 匹配模式和处理方法 然后交给
DefaultServeMux的HandleFunc函数来实现模式匹配处理其中这个
DefaultServeMux是go官方实现的 需要我们自己进行重现一下1
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6// HandleFunc registers the handler function for the given pattern
// in the DefaultServeMux.
// The documentation for ServeMux explains how patterns are matched.
func HandleFunc(pattern string, handler func(ResponseWriter, *Request)) {
DefaultServeMux.HandleFunc(pattern, handler)
}其中我们对于
DefaultServeMux结构体进行识别 会发现他的原始是1
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16type ServeMux struct {
mu sync.RWMutex
m map[string]muxEntry
es []muxEntry // slice of entries sorted from longest to shortest.
hosts bool // whether any patterns contain hostnames
}
type muxEntry struct {
h Handler
pattern string
}
// DefaultServeMux is the default ServeMux used by Serve.
var DefaultServeMux = &defaultServeMux
var defaultServeMux ServeMux我们自己可以仿照
go文档自己实现一个类似的方法1
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44// 处理函数
type HandleFunc func(http.ResponseWriter, *http.Request)
// 官方实现的 比较全面 <-自己来手动写一个 基础的
//type ServeMux struct {
// mu sync.RWMutex
// m map[string]muxEntry
// es []muxEntry // slice of entries sorted from longest to shortest.
// hosts bool // whether any patterns contain hostnames
//}
//
//type muxEntry struct {
// h Handler
// pattern string
//}
type Engine struct {
router map[string]HandleFunc
}
func New() *Engine {
return &Engine{router: make(map[string]HandleFunc)}
}
// 内部使用的
func (engine *Engine) addRounte(method string, pattern string, handler HandleFunc) {
key := method + "-" + pattern
engine.router[key] = handler
}
// get方法实现
func (engine *Engine) GET(pattern string, handler HandleFunc) {
engine.addRounte("GET", pattern, handler)
}
// post方法实现
func (engine *Engine) POST(pattern string, handler HandleFunc) {
engine.addRounte("POST", pattern, handler)
}
// run 开始运行
func (engine *Engine) Run(addr string) (err error) {
return http.ListenAndServe(addr, engine)
}
ListenAndServe | 参数接口实现
查看
go官方文档,不难发现1
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11// ListenAndServe listens on the TCP network address addr and then calls
// Serve with handler to handle requests on incoming connections.
// Accepted connections are configured to enable TCP keep-alives.
//
// The handler is typically nil, in which case the DefaultServeMux is used.
//
// ListenAndServe always returns a non-nil error.
func ListenAndServe(addr string, handler Handler) error {
server := &Server{Addr: addr, Handler: handler}
return server.ListenAndServe()
}其中有一个参数是
handler类型是Handler.1
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27// A Handler responds to an HTTP request.
//
// ServeHTTP should write reply headers and data to the ResponseWriter
// and then return. Returning signals that the request is finished; it
// is not valid to use the ResponseWriter or read from the
// Request.Body after or concurrently with the completion of the
// ServeHTTP call.
//
// Depending on the HTTP client software, HTTP protocol version, and
// any intermediaries between the client and the Go server, it may not
// be possible to read from the Request.Body after writing to the
// ResponseWriter. Cautious handlers should read the Request.Body
// first, and then reply.
//
// Except for reading the body, handlers should not modify the
// provided Request.
//
// If ServeHTTP panics, the server (the caller of ServeHTTP) assumes
// that the effect of the panic was isolated to the active request.
// It recovers the panic, logs a stack trace to the server error log,
// and either closes the network connection or sends an HTTP/2
// RST_STREAM, depending on the HTTP protocol. To abort a handler so
// the client sees an interrupted response but the server doesn't log
// an error, panic with the value ErrAbortHandler.
type Handler interface {
ServeHTTP(ResponseWriter, *Request)
}而这是一个
interface类型的 需要我们来实现其中的方法ServeHTTP,其中官方文档中的一个实现方式是1
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13// ServeHTTP dispatches the request to the handler whose
// pattern most closely matches the request URL.
func (mux *ServeMux) ServeHTTP(w ResponseWriter, r *Request) {
if r.RequestURI == "*" {
if r.ProtoAtLeast(1, 1) {
w.Header().Set("Connection", "close")
}
w.WriteHeader(StatusBadRequest)
return
}
h, _ := mux.Handler(r)
h.ServeHTTP(w, r)
}我们为了达到自己实现目的,进行简单的类型匹配~(可以直接简化实现)
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13func (engine *Engine) ServeHTTP(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/":
fmt.Fprintf(w, "URL.Path = %q\n", r.URL.Path)
case "/hello":
for k, v := range r.Header {
fmt.Fprintf(w, "Header[%q] = %q\n", k, v)
}
default:
fmt.Fprintf(w, "404 NOT FOUND: %s \n", r.URL)
}
}
区别对待参考 | 系统 + 自己 | 完整代码!
原本
//main.go
1 | // main.go |
自己实现
// base3/main.go
1 | // base3/main.go |
// base3/yasuo/yasuo.go
1 | // base3/yasuo/yasuo.go |