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1 /*
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2 request.c
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3
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4 Collection of articles that are marked for download.
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5
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6 $Id: request.c 3 2000-01-04 11:35:42Z enz $
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7 */
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8
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9 #include "request.h"
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10 #include <dirent.h>
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11 #include <errno.h>
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12 #include <fcntl.h>
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13 #include <sys/types.h>
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14 #include <sys/stat.h>
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15 #include <unistd.h>
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16 #include <assert.h>
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17 #include "config.h"
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18 #include "log.h"
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19 #include "util.h"
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20
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21
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22 /* This struct keeps record of the message IDs that are to be fetched from
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23 one particular host. Several of these are chained together via the
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24 "next" pointer, if we have several servers.
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25 */
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26
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27 struct Reqserv;
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28 typedef struct Reqserv Reqserv;
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29
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30 struct Reqserv {
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31 char* serv; /* Server the messages are to be requested
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32 from */
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33 char** reql; /* List of message IDs of requested
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34 messages. Some entries (that have been
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35 deleted) may be NULL */
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36 int reql_length; /* Number of string pointers in reql,
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37 including NULL entries */
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38 int reql_capacity; /* maximum number of string pointers reql
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39 can hold */
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40 Bool dirty; /* whether the request list needs to be
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41 rewritten to disk */
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42 Reqserv* next; /* next Reqserv in list */
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43 time_t mtime; /* last modification time of request file */
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44 };
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45
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46 /* List of servers */
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47 static Reqserv* reqserv = 0;
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48
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49 /* sanity check */
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50 static Bool is_open = FALSE;
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51
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52 /* for Req_first/Req_next */
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53 static char** iterator = 0;
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54 static char** iterator_end = 0;
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55
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56
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57 /* local functions */
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58 static Reqserv* newReqserv (const char* serv);
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59 static Bool getReqserv (const char* serv, Reqserv** rsz);
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60 static void fileRequest (Str file, const char *serv);
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61 static char** searchMsgId (const Reqserv * rs, const char *msgId);
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62 static void storeMsgId (Reqserv* rs, const char* msgId);
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63 static Bool readRequestfile (const char* serv, Reqserv** rsz);
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64 static time_t get_mtime (const char* serv);
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65
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66 /* read modification time of request file */
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67 static time_t get_mtime(const char* serv)
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68 {
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69 Str filename;
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70 struct stat stat1;
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71
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72 fileRequest(filename, serv);
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73 stat(filename, &stat1);
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74 return stat1.st_mtime;
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75 }
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76
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77
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78 /* create new Reqserv and queue it */
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79 static Reqserv* newReqserv(const char* serv)
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80 {
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81 Reqserv* rs = (Reqserv*) malloc(sizeof(Reqserv));
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82 rs->serv = strcpy(malloc(strlen(serv)+1), serv);
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83 rs->reql = 0;
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84 rs->reql_length = 0;
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85 rs->reql_capacity = 0;
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86 rs->next = reqserv;
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87 rs->dirty = FALSE;
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88 rs->mtime = 0;
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89 reqserv = rs;
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90 return rs;
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91 }
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92
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93
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94 /* get Reqserv for given server, and save it in "rsz". Load from file as
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95 necessary. Return TRUE on success. Otherwise log errors and return
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96 FALSE. (details in errno)
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97 */
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98 static Bool getReqserv(const char* serv, Reqserv** rsz)
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99 {
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100 Reqserv* rs;
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101 for (rs = reqserv; rs; rs = rs->next)
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102 if (!strcmp(serv, rs->serv)) {
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103 *rsz = rs;
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104 return TRUE;
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105 }
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106 return readRequestfile(serv, rsz);
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107 }
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108
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109
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110 /* Delete Reqserv from cache, if not up-to-date */
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111 static void
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112 cleanupReqserv( void )
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113 {
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114 Reqserv *rs, *prev, *next;
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115
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116 rs = reqserv;
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117 prev = NULL;
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118 while ( rs != NULL )
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119 {
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120 ASSERT( ! rs->dirty );
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121 next = rs->next;
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122 if ( get_mtime( rs->serv ) != rs->mtime )
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123 {
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124 if ( prev != NULL )
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125 prev->next = next;
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126 else
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127 reqserv = next;
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128 free( rs->serv );
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129 rs->serv = NULL;
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130 free( rs->reql );
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131 rs->reql = NULL;
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132 free( rs );
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133 }
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134 prev = rs;
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135 rs = next;
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136 }
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137 }
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138
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139 /* Save name of file storing requests from server "serv" in "file" */
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140 static void fileRequest( Str file, const char *serv)
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141 {
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142 snprintf( file, MAXCHAR, "%s/requested/%s", Cfg_spoolDir(), serv);
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143 }
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144
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145
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146 /* Search for msgid in Reqserv. Return pointer to list entry. Return 0 if
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147 list does not contain msgid. */
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148 static char** searchMsgId(const Reqserv * rs, const char *msgId )
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149 {
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150 char** rz;
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151 ASSERT(rs != 0);
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152
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153 if (!rs->reql)
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154 return 0;
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155
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156 for (rz = rs->reql; rz < rs->reql + rs->reql_length; rz++)
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157 if (*rz && !strcmp(*rz, msgId))
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158 return rz;
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159
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160 return 0;
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161 }
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162
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163
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164 Bool
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165 Req_contains(const char *serv, const char *msgId)
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166 {
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167 Reqserv* rs;
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168 ASSERT( is_open );
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169 if (getReqserv(serv, &rs) == FALSE)
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170 return FALSE;
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171 return searchMsgId(rs, msgId) ? TRUE : FALSE;
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172 }
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173
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174
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175 static void storeMsgId(Reqserv* rs, const char* msgId)
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176 {
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177 char* msgid;
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178
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179 if (searchMsgId(rs, msgId))
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180 /* already recorded */
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181 return;
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182
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183 msgid = strcpy(malloc(strlen(msgId)+1), msgId);
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184
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185 if (rs->reql_length >= rs->reql_capacity) {
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186 int c1 = rs->reql_capacity*2 + 10;
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187 rs->reql = (char**) realloc(rs->reql, c1*sizeof(char*));
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188 rs->reql_capacity = c1;
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189 }
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190
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191 *(rs->reql + rs->reql_length++) = msgid;
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192 rs->dirty = TRUE;
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193 }
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194
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195
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196 /* Add request for message "msgIg" from server "serv". Return TRUE iff
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197 successful.
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198 */
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199 Bool Req_add(const char *serv, const char *msgId)
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200 {
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201 Reqserv* rs;
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202 ASSERT( is_open );
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203 Log_dbg( "Marking %s on %s for download", msgId, serv );
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204
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205 if (getReqserv(serv, &rs) == FALSE)
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206 return FALSE;
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207 storeMsgId(rs, msgId);
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208 return TRUE;
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209 }
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210
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211 static Bool
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212 readLn( Str line, FILE* f )
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213 {
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214 size_t len;
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215
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216 if ( ! fgets( line, MAXCHAR, f ) )
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217 return FALSE;
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218 len = strlen( line );
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219 if ( line[ len - 1 ] == '\n' )
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220 line[ len - 1 ] = '\0';
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221 return TRUE;
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222 }
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223
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224 /* Read request file into new, non-queued Reqserv. Save new Reqserv in
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225 "rsz" and return TRUE on success. Returns FALSE on failure, see errno.
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226 If the file doesn't exist, an empty Reqserv is returned.
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227 */
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228 static Bool readRequestfile(const char* serv, Reqserv** rsz)
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229 {
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230 Str filename;
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231 Str line;
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232 FILE* file;
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233 Reqserv* rs;
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234
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235 fileRequest(filename, serv);
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236 Log_dbg("reading request file %s", filename);
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237
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238 file = fopen(filename, "r");
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239 if (!file && (errno == ENOENT)) {
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240 *rsz = newReqserv(serv);
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241 (*rsz)->mtime = get_mtime(serv);
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242 return TRUE;
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243 }
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244 if (Log_check(file != 0,
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245 "could not open %s for reading: %s",
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246 filename, strerror(errno)))
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247 return FALSE;
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248
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249 rs = *rsz = newReqserv(serv);
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250
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251 while( readLn(line, file) == TRUE) {
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252 char* line1 = Utl_stripWhiteSpace(line);
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253 if (*line1)
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254 storeMsgId(rs, line1);
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255 }
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256
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257 rs->dirty = FALSE;
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258
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259 if (Log_check(fclose(file) != EOF,
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260 "could not close %s properly: %s\n",
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261 filename, strerror(errno)))
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262 return FALSE;
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263
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264 return TRUE;
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265 }
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266
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267
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268 /* Write out request file for given Reqserv. Return TRUE on success. If an
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269 I/O error occurs, it is logged, and FALSE is returned.
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270 */
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271 static Bool writeRequestfile(Reqserv* rs)
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272 {
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273 Str filename;
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274 FILE* file;
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275 char** z;
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276
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277 fileRequest(filename, rs->serv);
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278 Log_dbg("writing request file %s", filename);
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279
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280 if (Log_check((file = fopen(filename, "w")) != 0,
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281 "could not open %s for writing: %s",
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282 filename, strerror(errno)))
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283 return FALSE;
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284
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285 if (rs->reql)
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286 for (z = rs->reql; z < rs->reql+rs->reql_length; z++)
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287 if (*z) {
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288 if (Log_check( fputs(*z, file) != EOF
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289 && fputs("\n", file) != EOF,
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290 "write error: %s", strerror(errno)))
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291 return FALSE;
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292 }
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293
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294 if (Log_check(fclose(file) != EOF,
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295 "could not close %s properly: %s\n",
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296 filename, strerror(errno)))
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297 return FALSE;
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298
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299 rs->dirty = FALSE;
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300 rs->mtime = get_mtime(rs->serv);
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301
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302 return TRUE;
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303 }
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304
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305
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306 void
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307 Req_remove( const char *serv, const char *msgId )
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308 {
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309 Reqserv* rs;
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310 char** z;
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311
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312 ASSERT( is_open );
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313 Log_dbg("Req_remove(\"%s\", \"%s\")", serv, msgId);
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314
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315 if (getReqserv(serv, &rs) == FALSE)
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316 return;
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317
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318 z = searchMsgId(rs, msgId);
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319 if ( ! z )
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320 return;
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321
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322 free(*z);
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323 *z = 0;
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324 rs->dirty = TRUE;
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325 }
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326
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327
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328 Bool
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329 Req_first( const char *serv, Str msgId )
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330 {
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331 Reqserv* rs;
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332
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333 ASSERT( is_open );
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334 ASSERT( !iterator && !iterator_end );
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335
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336 if (getReqserv(serv, &rs) == FALSE)
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337 return FALSE;
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338
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339 if (!rs->reql)
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340 return FALSE;
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341
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342 iterator = rs->reql - 1;
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343 iterator_end = rs->reql + rs->reql_length;
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344
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345 return Req_next(msgId);
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346 }
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347
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348
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349 Bool
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350 Req_next( Str msgId )
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351 {
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352 ASSERT( is_open );
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353 ASSERT(iterator && iterator_end);
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354
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355 if (iterator >= iterator_end)
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356 return FALSE;
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357 iterator++;
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358
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359 while (iterator < iterator_end) {
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360 if (!*iterator)
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361 iterator++;
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362 else {
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363 Utl_cpyStr(msgId, *iterator);
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364 return TRUE;
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365 }
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366 }
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367
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368 iterator = iterator_end = 0;
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369 return FALSE;
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370 }
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371
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372
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373 /* Get exclusive access to all request files. Maybe we already have had it,
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374 and the cache is outdated. So we delete request files, which have
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375 changed recently, from cache. These files will be reread on demand.
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376 */
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377 Bool
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378 Req_open(void)
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379 {
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380 Log_dbg("opening request database");
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381 ASSERT(is_open == FALSE);
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382 cleanupReqserv();
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383 is_open = TRUE;
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384 return TRUE;
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385 }
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386
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387
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388 /* Do not occupy the request files any longer. Write any changes to disk.
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389 Return TRUE on success, FALSE if an IO error occurs. */
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390 void Req_close(void)
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391 {
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392 Bool ret = TRUE;
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393 Reqserv* rs;
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394 Log_dbg("closing request database, writing changes to disk");
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395 ASSERT(is_open == TRUE);
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396
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397 for (rs = reqserv; rs; rs = rs->next) {
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398 if (rs->dirty == TRUE) {
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399 if (!writeRequestfile(rs))
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400 ret = FALSE;
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401 }
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402 }
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403
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404 is_open = FALSE;
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405 }
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