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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
/**
* Copyright (c) 2023, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "url_handler.hh"
#include <curl/curl.h>
#include "base/fs_util.hh"
#include "base/injector.hh"
#include "base/paths.hh"
#include "lnav.hh"
#include "service_tags.hh"
#include "url_handler.cfg.hh"
namespace lnav {
namespace url_handler {
void
looper::handler_looper::loop_body()
{
pollfd pfd[1];
pfd[0].events = POLLIN;
pfd[0].fd = this->hl_line_buffer.get_fd();
pfd[0].revents = 0;
log_debug("doing url handler poll");
auto prc = poll(pfd, 1, 100);
log_debug("poll rc %d", prc);
if (prc > 0) {
auto load_res
= this->hl_line_buffer.load_next_line(this->hl_last_range);
if (load_res.isErr()) {
log_error("failed to load next line: %s",
load_res.unwrapErr().c_str());
this->s_looping = false;
} else {
auto li = load_res.unwrap();
log_debug("li %d %d:%d",
li.li_partial,
li.li_file_range.fr_offset,
li.li_file_range.fr_size);
if (!li.li_partial && !li.li_file_range.empty()) {
auto read_res
= this->hl_line_buffer.read_range(li.li_file_range);
if (read_res.isErr()) {
log_error("cannot read line: %s",
read_res.unwrapErr().c_str());
} else {
auto cmd = trim(to_string(read_res.unwrap()));
log_debug("url handler command: %s", cmd.c_str());
isc::to<main_looper&, services::main_t>().send(
[cmd](auto& mlooper) {
auto exec_res
= execute_any(lnav_data.ld_exec_context, cmd);
if (exec_res.isErr()) {
auto um = exec_res.unwrapErr();
log_error(
"%s",
um.to_attr_line().get_string().c_str());
}
});
}
this->hl_last_range = li.li_file_range;
}
}
if (this->hl_line_buffer.is_pipe_closed()) {
log_info("URL handler finished");
this->s_looping = false;
}
}
}
Result<void, lnav::console::user_message>
looper::open(std::string url)
{
const auto& cfg = injector::get<const config&>();
log_info("open request for URL: %s", url.c_str());
auto* cu = curl_url();
auto set_rc = curl_url_set(
cu, CURLUPART_URL, url.c_str(), CURLU_NON_SUPPORT_SCHEME);
if (set_rc != CURLUE_OK) {
return Err(
lnav::console::user_message::error(
attr_line_t("invalid URL: ").append(lnav::roles::file(url)))
.with_reason(curl_url_strerror(set_rc)));
}
char* scheme_part;
auto get_rc = curl_url_get(cu, CURLUPART_SCHEME, &scheme_part, 0);
if (get_rc != CURLUE_OK) {
return Err(lnav::console::user_message::error(
attr_line_t("cannot get scheme from URL: ")
.append(lnav::roles::file(url)))
.with_reason(curl_url_strerror(set_rc)));
}
auto proto_iter = cfg.c_schemes.find(scheme_part);
if (proto_iter == cfg.c_schemes.end()) {
return Err(lnav::console::user_message::error(
attr_line_t("no defined handler for URL scheme: ")
.append(lnav::roles::file(scheme_part)))
.with_reason(curl_url_strerror(set_rc)));
}
log_info("found URL handler: %s",
proto_iter->second.p_handler.pp_value.c_str());
auto err_pipe_res = auto_pipe::for_child_fd(STDERR_FILENO);
if (err_pipe_res.isErr()) {
return Err(
lnav::console::user_message::error(
attr_line_t("cannot open URL: ").append(lnav::roles::file(url)))
.with_reason(err_pipe_res.unwrapErr()));
}
auto err_pipe = err_pipe_res.unwrap();
auto out_pipe_res = auto_pipe::for_child_fd(STDOUT_FILENO);
if (out_pipe_res.isErr()) {
return Err(
lnav::console::user_message::error(
attr_line_t("cannot open URL: ").append(lnav::roles::file(url)))
.with_reason(out_pipe_res.unwrapErr()));
}
auto out_pipe = out_pipe_res.unwrap();
auto child_pid_res = lnav::pid::from_fork();
if (child_pid_res.isErr()) {
return Err(
lnav::console::user_message::error(
attr_line_t("cannot open URL: ").append(lnav::roles::file(url)))
.with_reason(child_pid_res.unwrapErr()));
}
auto child_pid = child_pid_res.unwrap();
out_pipe.after_fork(child_pid.in());
err_pipe.after_fork(child_pid.in());
auto name = proto_iter->second.p_handler.pp_value;
if (child_pid.in_child()) {
auto dev_null = ::open("/dev/null", O_RDONLY | O_CLOEXEC);
dup2(dev_null, STDIN_FILENO);
char* host_part = nullptr;
curl_url_get(cu, CURLUPART_HOST, &host_part, 0);
std::string host_part_str;
if (host_part != nullptr) {
host_part_str = host_part;
}
auto source_path = ghc::filesystem::path{
proto_iter->second.p_handler.pp_location.sl_source.get()};
auto new_path = lnav::filesystem::build_path({
source_path.parent_path(),
lnav::paths::dotlnav() / "formats/default",
});
setenv("PATH", new_path.c_str(), 1);
setenv("URL_HOSTNAME", host_part_str.c_str(), 1);
const char* args[] = {
name.c_str(),
nullptr,
};
execvp(name.c_str(), (char**) args);
_exit(EXIT_FAILURE);
}
auto error_queue = std::make_shared<std::vector<std::string>>();
std::thread err_reader([err = std::move(err_pipe.read_end()),
name,
error_queue,
child_pid = child_pid.in()]() mutable {
line_buffer lb;
file_range pipe_range;
bool done = false;
log_debug("error reader");
lb.set_fd(err);
while (!done) {
auto load_res = lb.load_next_line(pipe_range);
if (load_res.isErr()) {
done = true;
} else {
auto li = load_res.unwrap();
pipe_range = li.li_file_range;
if (li.li_file_range.empty()) {
done = true;
} else {
lb.read_range(li.li_file_range)
.then([name, error_queue, child_pid](auto sbr) {
auto line_str = string_fragment(
sbr.get_data(), 0, sbr.length())
.trim("\n");
if (error_queue->size() < 5) {
error_queue->emplace_back(line_str.to_string());
}
log_debug("%s[%d]: %.*s",
name.c_str(),
child_pid,
line_str.length(),
line_str.data());
});
}
}
}
});
err_reader.detach();
auto child = std::make_shared<handler_looper>(
url, std::move(child_pid), std::move(out_pipe.read_end()));
this->s_children.add_child_service(child);
this->l_children[url] = child;
return Ok();
}
void
looper::close(std::string url)
{
}
} // namespace url_handler
} // namespace lnav
|
