// 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)
}