Golang C.Env方法代码示例

// Set makes a two-way binding between the given Goji request context and the
// given go.net/context.Context. Returns the fresh context.Context that contains
// this binding. Using the ToC and From functions will allow you to convert
// between one and the other.
//
// Note that since context.Context's are immutable, you will have to call this
// function to "re-bind" the request's canonical context.Context if you ever
// decide to change it.
func Set(c *web.C, context context.Context) context.Context {
	if c.Env == nil {
		c.Env = make(map[interface{}]interface{})
	}

	ctx := ctx{c, context}
	c.Env[&ckey] = ctx
	return ctx
}

// EnvInit is a middleware that allocates an environment map if one does not
// already exist. This is necessary because Goji does not guarantee that Env is
// present when running middleware (it avoids forcing the map allocation). Note
// that other middleware should check Env for nil in order to maximize
// compatibility (when EnvInit is not used, or when another middleware layer
// blanks out Env), but for situations in which the user controls the middleware
// stack and knows EnvInit is present, this middleware can eliminate a lot of
// boilerplate.
func EnvInit(c *web.C, h http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		if c.Env == nil {
			c.Env = make(map[string]interface{})
		}
		h.ServeHTTP(w, r)
	}

	return http.HandlerFunc(fn)
}

// URLQuery is a middleware to parse the URL Query parameters just once,
// and store the resulting url.Values in the context.
func URLQuery(c *web.C, h http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		if c.Env == nil {
			c.Env = make(map[interface{}]interface{})
		}
		c.Env[URLQueryKey] = r.URL.Query()

		h.ServeHTTP(w, r)
	}

	return http.HandlerFunc(fn)
}

// Use c.Env["FOO"] = "Bar"
func SetupEnv(c *web.C, h http.Handler) http.Handler {
	handler := func(w http.ResponseWriter, r *http.Request) {
		if c.Env == nil {
			c.Env = make(map[interface{}]interface{})
		}

		// Call the next handler
		h.ServeHTTP(w, r)
	}

	return http.HandlerFunc(handler)
}

// RequestID is a middleware that injects a request ID into the context of each
// request. A request ID is a string of the form "host.example.com/random-0001",
// where "random" is a base62 random string that uniquely identifies this go
// process, and where the last number is an atomically incremented request
// counter.
func RequestID(c *web.C, h http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		if c.Env == nil {
			c.Env = make(map[string]interface{})
		}
		myid := atomic.AddUint64(&reqid, 1)
		c.Env[RequestIDKey] = fmt.Sprintf("%s-%06d", prefix, myid)

		h.ServeHTTP(w, r)
	}

	return http.HandlerFunc(fn)
}

// RealIP is a middleware that sets a http.Request's RemoteAddr to the results
// of parsing either the X-Forwarded-For header or the X-Real-IP header (in that
// order). It places the original value of RemoteAddr in a context environment
// variable.
//
// This middleware should be inserted fairly early in the middleware stack to
// ensure that subsequent layers (e.g., request loggers) which examine the
// RemoteAddr will see the intended value.
//
// You should only use this middleware if you can trust the headers passed to
// you (in particular, the two headers this middleware uses), for example
// because you have placed a reverse proxy like HAProxy or nginx in front of
// Goji. If your reverse proxies are configured to pass along arbitrary header
// values from the client, or if you use this middleware without a reverse
// proxy, malicious clients will be able to make you very sad (or, depending on
// how you're using RemoteAddr, vulnerable to an attack of some sort).
func RealIP(c *web.C, h http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		if rip := realIP(r); rip != "" {
			if c.Env == nil {
				c.Env = make(map[string]interface{})
			}
			c.Env[OriginalRemoteAddrKey] = r.RemoteAddr
			r.RemoteAddr = rip
		}
		h.ServeHTTP(w, r)
	}

	return http.HandlerFunc(fn)
}

/* {{{ func EnvInit(c *web.C, h http.Handler) http.Handler
 * 初始化环境
 */
func EnvInit(c *web.C, h http.Handler) http.Handler {
	fn := func(w http.ResponseWriter, r *http.Request) {
		ac := new(Access) //access日志信息
		ac.Time = time.Now()
		ac.Method = r.Method
		ac.URI = r.RequestURI
		ac.Proto = r.Proto
		ac.Host = r.Host
		ac.InHeader = &r.Header
		// env
		if c.Env == nil {
			//c.Env = make(map[string]interface{})
			c.Env = make(map[interface{}]interface{})
		}

		// make rand string(for debug, session...)
		buf := make([]byte, 16)
		randbo.New().Read(buf) //号称最快的随机字符串
		ac.Session = fmt.Sprintf("%x", buf)

		c.Env[RequestIDKey] = ac.Session

		c.Env[LogPrefixKey] = "[" + ac.Session[:10] + "]" //只显示前十位

		Trace("[%s] [%s %s] started", ac.Session[:10], r.Method, r.RequestURI)

		lw := utils.WrapWriter(w)

		pathPieces := strings.Split(r.URL.Path, "/")
		for off, piece := range pathPieces {
			if piece != "" {
				if off == 1 {
					c.Env[EndpointKey] = piece
				}
				if off == 2 && piece[0] != '@' { //@开头是selector
					c.Env[RowkeyKey] = piece
				}
				if off > 1 && piece[0] == '@' {
					c.Env[SelectorKey] = piece
				}
			}
		}
		// real ip(处理在代理服务器之后的情况)
		if rip := realIP(r); rip != "" {
			c.Env[OriginalRemoteAddrKey] = r.RemoteAddr
			r.RemoteAddr = rip
		}
		ac.IP = r.RemoteAddr

		//init RESTContext
		var rcErr error
		var rc *RESTContext
		rc, rcHolder, rcErr = RCHolder(*c, w, r)
		rc.Access = ac
		rc.Access.ReqLength = len(rc.RequestBody)
		if rcErr != nil {
			rc.RESTBadRequest(rcErr)
			return
		}

		h.ServeHTTP(lw, r)

	}

	return http.HandlerFunc(fn)
}