121 lines
3.2 KiB
Go
121 lines
3.2 KiB
Go
package server
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import (
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"net/http"
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"sync"
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"github.com/asim/go-micro/client"
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log "github.com/golang/glog"
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)
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var ctxs = struct {
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sync.Mutex
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m map[*http.Request]*serverContext
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}{
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m: make(map[*http.Request]*serverContext),
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}
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// A server context interface
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type Context interface {
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Request() Request // the request made to the server
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Headers() Headers // the response headers
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NewRequest(string, string, interface{}) client.Request // a new scoped client request
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NewProtoRequest(string, string, interface{}) client.Request // a new scoped client request
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NewJsonRequest(string, string, interface{}) client.Request // a new scoped client request
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}
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// context represents the context of an in-flight HTTP request.
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// It implements the appengine.Context and http.ResponseWriter interfaces.
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type serverContext struct {
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req *serverRequest
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outCode int
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outHeader http.Header
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outBody []byte
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}
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// Copied from $GOROOT/src/pkg/net/http/transfer.go. Some response status
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// codes do not permit a response body (nor response entity headers such as
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// Content-Length, Content-Type, etc).
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func bodyAllowedForStatus(status int) bool {
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switch {
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case status >= 100 && status <= 199:
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return false
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case status == 204:
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return false
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case status == 304:
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return false
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}
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return true
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}
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func getServerContext(req *http.Request) *serverContext {
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ctxs.Lock()
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c := ctxs.m[req]
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ctxs.Unlock()
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if c == nil {
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// Someone passed in an http.Request that is not in-flight.
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panic("NewContext passed an unknown http.Request")
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}
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return c
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}
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func (c *serverContext) NewRequest(service, method string, request interface{}) client.Request {
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req := client.NewRequest(service, method, request)
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// TODO: set headers and scope
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req.Headers().Set("X-User-Session", c.Request().Session("X-User-Session"))
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return req
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}
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func (c *serverContext) NewProtoRequest(service, method string, request interface{}) client.Request {
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req := client.NewProtoRequest(service, method, request)
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// TODO: set headers and scope
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req.Headers().Set("X-User-Session", c.Request().Session("X-User-Session"))
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return req
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}
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func (c *serverContext) NewJsonRequest(service, method string, request interface{}) client.Request {
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req := client.NewJsonRequest(service, method, request)
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// TODO: set headers and scope
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req.Headers().Set("X-User-Session", c.Request().Session("X-User-Session"))
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return req
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}
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// The response headers
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func (c *serverContext) Headers() Headers {
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return c.outHeader
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}
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// The response headers
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func (c *serverContext) Header() http.Header {
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return c.outHeader
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}
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// The request made to the server
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func (c *serverContext) Request() Request {
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return c.req
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}
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func (c *serverContext) Write(b []byte) (int, error) {
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if c.outCode == 0 {
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c.WriteHeader(http.StatusOK)
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}
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if len(b) > 0 && !bodyAllowedForStatus(c.outCode) {
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return 0, http.ErrBodyNotAllowed
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}
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c.outBody = append(c.outBody, b...)
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return len(b), nil
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}
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func (c *serverContext) WriteHeader(code int) {
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if c.outCode != 0 {
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log.Error("WriteHeader called multiple times on request.")
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return
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}
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c.outCode = code
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}
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func GetContext(r *http.Request) *serverContext {
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return getServerContext(r)
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}
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