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
|
/*
** Copyright (C) 2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#include "config.h"
#include <string>
#include <algorithm>
#include <atomic>
#include <cstdio>
#include <unistd.h>
#include "mu-cmd.hh"
#include "mu-server.hh"
#include "utils/mu-utils.hh"
#include "utils/mu-command-handler.hh"
#include "utils/mu-readline.hh"
using namespace Mu;
static std::atomic<int> MuTerminate{0};
static bool tty;
static void
sig_handler(int sig)
{
MuTerminate = sig;
}
static void
install_sig_handler(void)
{
static struct sigaction action;
int i, sigs[] = {SIGINT, SIGHUP, SIGTERM, SIGPIPE};
MuTerminate = 0;
action.sa_handler = sig_handler;
sigemptyset(&action.sa_mask);
action.sa_flags = SA_RESETHAND;
for (i = 0; i != G_N_ELEMENTS(sigs); ++i)
if (sigaction(sigs[i], &action, NULL) != 0)
g_critical("set sigaction for %d failed: %s",
sigs[i], g_strerror(errno));
}
/*
* Markers for/after the length cookie that precedes the expression we write to
* output. We use octal 376, 377 (ie, 0xfe, 0xff) as they will never occur in
* utf8 */
#define COOKIE_PRE "\376"
#define COOKIE_POST "\377"
static void
cookie(size_t n)
{
const auto num{static_cast<unsigned>(n)};
if (tty) // for testing.
::printf("[%x]", num);
else
::printf(COOKIE_PRE "%x" COOKIE_POST, num);
}
static void
output_sexp_stdout(const Sexp& sexp, Server::OutputFlags flags)
{
/* if requested, insert \n between list elements; note:
* is _not_ inherited by children */
Sexp::Format fopts{};
if (any_of(flags & Server::OutputFlags::SplitList))
fopts |= Sexp::Format::SplitList;
const auto str{sexp.to_string(fopts)};
cookie(str.size() + 1);
if (G_UNLIKELY(::puts(str.c_str()) < 0)) {
g_critical("failed to write output '%s'", str.c_str());
::raise(SIGTERM); /* terminate ourselves */
}
if (any_of(flags & Server::OutputFlags::Flush))
std::fflush(stdout);
}
static void
report_error(const Mu::Error& err) noexcept
{
output_sexp_stdout(Sexp(":error"_sym, static_cast<size_t>(err.code()),
":message"_sym, err.what()),
Server::OutputFlags::Flush);
}
Result<void>
Mu::mu_cmd_server(const Mu::Options& opts) try {
auto store = Store::make(opts.runtime_path(RuntimePath::XapianDb),
Store::Options::Writable);
if (!store)
return Err(store.error());
Server server{*store, output_sexp_stdout};
g_message("created server with store @ %s; maildir @ %s; debug-mode %s;"
"readline: %s",
store->properties().database_path.c_str(),
store->properties().root_maildir.c_str(),
opts.debug ? "yes" : "no",
have_readline() ? "yes" : "no");
tty = ::isatty(::fileno(stdout));
const auto eval = std::string{opts.server.commands ? "(help :full t)" : opts.server.eval};
if (!eval.empty()) {
server.invoke(eval);
return Ok();
}
// Note, the readline stuff is inactive unless on a tty.
const auto histpath{opts.runtime_path(RuntimePath::Cache) + "/history"};
setup_readline(histpath, 50);
install_sig_handler();
std::cout << ";; Welcome to the " << PACKAGE_STRING << " command-server"
<< (opts.debug ? " (debug-mode)" : "") << '\n'
<< ";; Use (help) to get a list of commands, (quit) to quit.\n";
bool do_quit{};
while (!MuTerminate && !do_quit) {
std::fflush(stdout); // Needed for Windows, see issue #1827.
const auto line{read_line(do_quit)};
if (line.find_first_not_of(" \t") == std::string::npos)
continue; // skip whitespace-only lines
do_quit = server.invoke(line) ? false : true;
save_line(line);
}
if (MuTerminate != 0)
g_message ("shutting down due to signal %d", MuTerminate.load());
shutdown_readline();
return Ok();
} catch (const Error& er) {
/* note: user-level error, "OK" for mu */
report_error(er);
g_warning("server caught exception: %s", er.what());
return Ok();
} catch (...) {
g_critical("server caught exception");
return Err(Error::Code::Internal, "caught exception");
}
|
