1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
#include <mbgl/storage/file_request_baton.hpp>
#include <mbgl/storage/file_request.hpp>
#include <mbgl/storage/response.hpp>
namespace mbgl {
FileRequestBaton::FileRequestBaton(FileRequest *request_, const std::string &path, uv_loop_t *loop)
: thread_id(uv_thread_self()), request(request_) {
req.data = this;
uv_fs_open(loop, &req, path.c_str(), O_RDONLY, S_IRUSR, file_opened);
}
FileRequestBaton::~FileRequestBaton() {
}
void FileRequestBaton::cancel() {
canceled = true;
// uv_cancel fails frequently when the request has already been started.
// In that case, we have to let it complete and check the canceled bool
// instead.
uv_cancel((uv_req_t *)&req);
}
void FileRequestBaton::notify_error(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (ptr->request && req->result < 0 && !ptr->canceled && req->result != UV_ECANCELED) {
ptr->request->response = std::unique_ptr<Response>(new Response);
ptr->request->response->code = req->result == UV_ENOENT ? 404 : 500;
ptr->request->response->message = uv_strerror(int(req->result));
ptr->request->notify();
}
}
void FileRequestBaton::file_opened(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (req->result < 0) {
// Opening failed or was canceled. There isn't much left we can do.
notify_error(req);
cleanup(req);
} else {
const uv_file fd = uv_file(req->result);
// We're going to reuse this handle, so we need to cleanup first.
uv_fs_req_cleanup(req);
if (ptr->canceled || !ptr->request) {
// Either the FileRequest object has been destructed, or the
// request was canceled.
uv_fs_close(req->loop, req, fd, file_closed);
} else {
ptr->fd = fd;
uv_fs_fstat(req->loop, req, fd, file_stated);
}
}
}
void FileRequestBaton::file_stated(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (req->result < 0 || ptr->canceled || !ptr->request) {
// Stating failed or was canceled. We already have an open file handle
// though, which we'll have to close.
notify_error(req);
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, ptr->fd, file_closed);
} else {
if (static_cast<const uv_stat_t *>(req->ptr)->st_size > std::numeric_limits<int>::max()) {
// File is too large for us to open this way because uv_buf's only support unsigned
// ints as maximum size.
if (ptr->request) {
ptr->request->response = std::unique_ptr<Response>(new Response);
ptr->request->response->code = UV_EFBIG;
ptr->request->response->message = uv_strerror(UV_EFBIG);
ptr->request->notify();
}
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, ptr->fd, file_closed);
} else {
const unsigned int size =
(unsigned int)(static_cast<const uv_stat_t *>(req->ptr)->st_size);
ptr->body.resize(size);
ptr->buffer = uv_buf_init(const_cast<char *>(ptr->body.data()), size);
uv_fs_req_cleanup(req);
uv_fs_read(req->loop, req, ptr->fd, &ptr->buffer, 1, 0, file_read);
}
}
}
void FileRequestBaton::file_read(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (req->result < 0 || ptr->canceled || !ptr->request) {
// Stating failed or was canceled. We already have an open file handle
// though, which we'll have to close.
notify_error(req);
} else {
// File was successfully read.
if (ptr->request) {
ptr->request->response = std::unique_ptr<Response>(new Response);
ptr->request->response->code = 200;
ptr->request->response->data = std::move(ptr->body);
ptr->request->notify();
}
}
uv_fs_req_cleanup(req);
uv_fs_close(req->loop, req, ptr->fd, file_closed);
}
void FileRequestBaton::file_closed(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (req->result < 0) {
// Closing the file failed. But there isn't anything we can do.
}
cleanup(req);
}
void FileRequestBaton::cleanup(uv_fs_t *req) {
FileRequestBaton *ptr = (FileRequestBaton *)req->data;
assert(ptr->thread_id == uv_thread_self());
if (ptr->request) {
ptr->request->ptr = nullptr;
}
uv_fs_req_cleanup(req);
delete ptr;
}
}
|
