src/server/daemon/event.c

Sat, 11 Mar 2023 13:57:30 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 11 Mar 2023 13:57:30 +0100
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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <cx/hash_map.h>
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30 #include "../util/atomic.h"
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32 #include "event.h"
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34 CxMap *event_handler_map = NULL;
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35 int numevhandlers = 0;
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36
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37 EVHandler *default_event_handler = NULL;
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38
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39 EVHandler *last_handler_c = NULL;
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41 int create_event_handler(EventHandlerConfig *cfg) {
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42 if(event_handler_map == NULL) {
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43 event_handler_map = cxHashMapCreate(cxDefaultAllocator, 16);
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44 }
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45
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46 CxHashKey key = cx_hash_key_bytes((const unsigned char*)cfg->name.ptr, cfg->name.length);
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47
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48 // if the event handler already exists, we don't modify it
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49 if(cxMapGet(event_handler_map, key)) {
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50 /* TODO: log message */
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51 /* TODO: set reload status */
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52 log_ereport(LOG_DEBUG, "event handler %s already exists", cfg->name.ptr);
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53 return 0;
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54 }
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55
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56 // create new handler
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57 EVHandler *e = evhandler_create(cfg);
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58 if(e == NULL) {
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59 log_ereport(LOG_FAILURE, "evhandler_create failed");
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60 return 1;
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61 }
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63 if(cfg->isdefault) {
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64 if(default_event_handler) {
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65 /* there can be only one default event handler */
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66 /* TODO: log warning */
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67 }
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68 default_event_handler = e;
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69 }
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71 int ret = cxMapPut(event_handler_map, key, e);
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72 if(ret == 0) {
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73 last_handler_c = e;
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74 numevhandlers++;
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75 }
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77 return ret;
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78 }
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80 /*
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81 * checks if there is at least one event handler and a default handler
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82 * if necessary, check_event_handler_cfg() creates a default event handler
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83 */
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84 int check_event_handler_cfg() {
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85 if(numevhandlers > 0 ) {
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86 if(default_event_handler) {
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87 return 0;
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88 } else {
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89 default_event_handler = last_handler_c;
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90 return 0;
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91 }
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92 }
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93
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94 EventHandlerConfig cfg;
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95 cfg.name = cx_str("default");
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96 cfg.nthreads = 1;
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97 cfg.isdefault = 1;
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98
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99 return create_event_handler(&cfg);
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100 }
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101
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102
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103 EVHandler* get_default_event_handler() {
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104 return default_event_handler;
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105 }
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106
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107 EVHandler* get_event_handler(const char *name) {
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108 return cxMapGet(event_handler_map, cx_hash_key_str(name));
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109 }
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111 EventHandler* ev_instance(EVHandler *ev) {
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112 int nev = ev->numins;
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113 if(nev == 1) {
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114 return ev->instances[0];
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115 }
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116
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117 int ins = ev->current & nev;
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118 ws_atomic_inc32(&ev->current);
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119 return ev->instances[ins];
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120 }

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