xref: /unit/go/response.go (revision 1713:f5ba5973a0a3)
1/*
2 * Copyright (C) Max Romanov
3 * Copyright (C) NGINX, Inc.
4 */
5
6package unit
7
8/*
9#include "nxt_cgo_lib.h"
10*/
11import "C"
12
13import (
14	"net/http"
15)
16
17type response struct {
18	header     http.Header
19	header_sent bool
20	c_req      *C.nxt_unit_request_info_t
21	ch         chan int
22}
23
24func (r *response) Header() http.Header {
25	return r.header
26}
27
28func (r *response) Write(p []byte) (n int, err error) {
29	if !r.header_sent {
30		r.WriteHeader(http.StatusOK)
31	}
32
33	l := len(p)
34	written := int(0)
35	br := buf_ref(p)
36
37	for written < l {
38		res := C.nxt_cgo_response_write(r.c_req, br, C.uint32_t(l - written))
39
40		written += int(res)
41		br += C.uintptr_t(res)
42
43		if (written < l) {
44			if r.ch == nil {
45				r.ch = make(chan int, 2)
46			}
47
48			wait_shm_ack(r.ch)
49		}
50	}
51
52	return written, nil
53}
54
55func (r *response) WriteHeader(code int) {
56	if r.header_sent {
57		nxt_go_warn("multiple response.WriteHeader calls")
58		return
59	}
60	r.header_sent = true
61
62	// Set a default Content-Type
63	if _, hasType := r.header["Content-Type"]; !hasType {
64		r.header.Add("Content-Type", "text/html; charset=utf-8")
65	}
66
67	fields := 0
68	fields_size := 0
69
70	for k, vv := range r.header {
71		for _, v := range vv {
72			fields++
73			fields_size += len(k) + len(v)
74		}
75	}
76
77	C.nxt_unit_response_init(r.c_req, C.uint16_t(code), C.uint32_t(fields),
78		C.uint32_t(fields_size))
79
80	for k, vv := range r.header {
81		for _, v := range vv {
82			C.nxt_unit_response_add_field(r.c_req, str_ref(k), C.uint8_t(len(k)),
83				str_ref(v), C.uint32_t(len(v)))
84		}
85	}
86
87	C.nxt_unit_response_send(r.c_req)
88}
89
90func (r *response) Flush() {
91	if !r.header_sent {
92		r.WriteHeader(http.StatusOK)
93	}
94}
95
96var observer_registry_ observable
97
98func wait_shm_ack(c chan int) {
99	observer_registry_.attach(c)
100
101	_ = <-c
102}
103
104//export nxt_go_shm_ack_handler
105func nxt_go_shm_ack_handler(ctx *C.nxt_unit_ctx_t) {
106	observer_registry_.notify(1)
107}
108