[btr] Add the node type parameter to btr_node_status().
[paraslash.git] / file_write.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file file_write.c simple output plugin for testing purposes */
8
9 #include <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include <sys/time.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "write.h"
21 #include "write_common.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "file_write.cmdline.h"
25 #include "error.h"
26
27 /** data specific to the file writer */
28 struct private_file_write_data {
29 /** the file descriptor of the output file */
30 int fd;
31 /** non-zero if \a fd was added to the write fd set */
32 int check_fd;
33 };
34
35 /*
36 * Get a random filename.
37 *
38 * This is by no means a secure way to create temporary files in a hostile
39 * directory like \p /tmp. However, we use it only for creating temp files in
40 * ~/.paraslash, for which it is OK. Result must be freed by the caller.
41 */
42 __must_check __malloc static char *random_filename(void)
43 {
44 char *result, *home = para_homedir();
45 struct timeval tv;
46
47 gettimeofday(&tv, NULL);
48 srandom(tv.tv_usec);
49 result = make_message("%s/.paraslash/%08lu", home,
50 para_random(99999999));
51 free(home);
52 return result;
53 }
54
55 static int file_write_open(struct writer_node *wn)
56 {
57 struct private_file_write_data *pfwd = para_calloc(
58 sizeof(struct private_file_write_data));
59 struct file_write_args_info *conf = wn->conf;
60 char *filename;
61
62 if (conf->filename_given)
63 filename = conf->filename_arg;
64 else
65 filename = random_filename();
66 wn->private_data = pfwd;
67 pfwd->fd = open(filename, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR);
68 if (!conf->filename_given)
69 free(filename);
70 if (pfwd->fd >= 0)
71 return 1;
72 free(pfwd);
73 return -E_FW_OPEN;
74 }
75
76 static int file_write_pre_select(struct sched *s, struct writer_node *wn)
77 {
78 struct private_file_write_data *pfwd = wn->private_data;
79 struct writer_node_group *wng = wn->wng;
80
81 pfwd->check_fd = 0;
82 if (pfwd->fd <= 0)
83 return -E_FW_NO_FILE;
84 if (!*wng->loaded)
85 return 1;
86 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
87 pfwd->check_fd = 1;
88 return 1;
89 }
90
91 static void file_write_pre_select_btr(struct sched *s, struct task *t)
92 {
93 struct writer_node *wn = container_of(t, struct writer_node, task);
94 struct private_file_write_data *pfwd = wn->private_data;
95 int ret;
96
97 t->error = 0;
98 pfwd->check_fd = 0;
99 ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF);
100 if (ret > 0) {
101 para_fd_set(pfwd->fd, &s->wfds, &s->max_fileno);
102 pfwd->check_fd = 1;
103 } else if (ret < 0) {
104 s->timeout.tv_sec = 0;
105 s->timeout.tv_usec = 1;
106 }
107 }
108
109 static int file_write_post_select(struct sched *s, struct writer_node *wn)
110 {
111 struct private_file_write_data *pfwd = wn->private_data;
112 struct writer_node_group *wng = wn->wng;
113 int ret;
114
115 if (!pfwd->check_fd)
116 return 1;
117 if (*wng->loaded <= wn->written)
118 return 1;
119 if (!FD_ISSET(pfwd->fd, &s->wfds))
120 return 1;
121 // PARA_INFO_LOG("writing %zd\n", *wng->loaded);
122 ret = write(pfwd->fd, *wng->bufp + wn->written,
123 *wng->loaded - wn->written);
124 if (ret < 0)
125 return -E_FW_WRITE;
126 wn->written += ret;
127 return 1;
128 }
129
130 static void file_write_close(struct writer_node *wn)
131 {
132 struct private_file_write_data *pfwd = wn->private_data;
133
134 close(pfwd->fd);
135 file_cmdline_parser_free(wn->conf);
136 free(pfwd);
137 }
138
139 static void file_write_post_select_btr(__a_unused struct sched *s,
140 struct task *t)
141 {
142 struct writer_node *wn = container_of(t, struct writer_node, task);
143 struct private_file_write_data *pfwd = wn->private_data;
144 struct btr_node *btrn = wn->btrn;
145 int ret;
146 char *buf;
147 size_t bytes;
148
149 t->error = 0;
150 ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF);
151 if (ret == 0)
152 return;
153 if (ret < 0)
154 goto err;
155 if (!pfwd->check_fd)
156 return;
157 if (!FD_ISSET(pfwd->fd, &s->wfds))
158 return;
159 bytes = btr_next_buffer(btrn, &buf);
160 assert(bytes > 0);
161 //PARA_INFO_LOG("writing %zu\n", bytes);
162 ret = write(pfwd->fd, buf, bytes);
163 if (ret < 0)
164 goto err;
165 btr_consume(btrn, ret);
166 return;
167 err:
168 assert(ret < 0);
169 t->error = ret;
170 }
171
172 __malloc static void *file_write_parse_config(const char *options)
173 {
174 struct file_write_args_info *conf
175 = para_calloc(sizeof(struct file_write_args_info));
176 int ret = file_cmdline_parser_string(options, conf, "file_write");
177
178 PARA_INFO_LOG("conf->filename_given: %d\n", conf->filename_given);
179 if (!ret)
180 return conf;
181 free(conf);
182 return NULL;
183 }
184
185 /** the init function of the file writer */
186 void file_write_init(struct writer *w)
187 {
188 struct file_write_args_info dummy;
189
190 file_cmdline_parser_init(&dummy);
191 w->open = file_write_open;
192 w->pre_select = file_write_pre_select;
193 w->pre_select_btr = file_write_pre_select_btr;
194 w->post_select = file_write_post_select;
195 w->post_select_btr = file_write_post_select_btr;
196 w->parse_config = file_write_parse_config;
197 w->close = file_write_close;
198 w->shutdown = NULL; /* nothing to do */
199 w->help = (struct ggo_help) {
200 .short_help = file_write_args_info_help,
201 .detailed_help = file_write_args_info_detailed_help
202 };
203 file_cmdline_parser_free(&dummy);
204 }