src/server/daemon/resourcepool.c

Wed, 06 Sep 2023 22:48:08 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 06 Sep 2023 22:48:08 +0200
changeset 508
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parent 490
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permissions
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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 2022 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 "resourcepool.h"
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30 #include "request.h"
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31 #include "session.h"
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32 #include "../public/nsapi.h"
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33 #include "../util/atomic.h"
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34
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35 #define RESOURCE_POOL_MAX_DEFAULT 32
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36
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37 #define RESOURCE_POOL_MAX_ALLOC 268435455
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38
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39 static CxMap *resource_pool_types;
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40
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41 int init_resource_pools(void) {
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42 resource_pool_types = cxHashMapCreate(cxDefaultAllocator, CX_STORE_POINTERS, 4);
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43 return resource_pool_types ? 0 : 1;
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44 }
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45
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46 int resourcepool_register_type(const char *type_name, ResourceType *type_info) {
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47 if(cxMapPut(resource_pool_types, cx_hash_key_str(type_name), type_info)) {
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48 log_ereport(LOG_CATASTROPHE, "resourcepool_register_type: OOM");
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49 return 1;
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50 }
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51 return 0;
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52 }
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53
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55
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56 int resourcepool_new(ServerConfiguration *cfg, cxstring type, cxstring name, ConfigNode *node) {
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57 ResourceType *restype = cxMapGet(resource_pool_types, cx_hash_key_bytes((unsigned const char*)type.ptr, type.length));
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58 if(!restype) {
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59 log_ereport(LOG_MISCONFIG, "unknown resource pool type: %s", type.ptr);
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60 return 1;
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61 }
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62
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63 char *respool_name = cx_strdup_a(cfg->a, name).ptr;
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64 if(!respool_name) {
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65 log_ereport(LOG_FAILURE, "resourcepool_new: OOM");
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66 return 1;
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67 }
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68
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69 // convert ConfigNode to pblock
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70 // no sub-objects allowed for this specific ConfigNode, therefore
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71 // it can be represented as key-value-pairs
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72 pblock *param = config_obj2pblock(cfg->pool, node);
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73 if(!param) {
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74 log_ereport(LOG_FAILURE, "resourcepool_new: OOM");
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75 return 1;
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76 }
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77
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78 ResourcePool *respool = pool_malloc(cfg->pool, sizeof(ResourcePool));
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79 if(!respool) {
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80 log_ereport(LOG_FAILURE, "resourcepool_new: OOM");
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81 return 1;
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82 }
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83 respool->pool = cfg->pool;
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84
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85 void *respool_data = restype->init(cfg->pool, name.ptr, param);
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86 if(!respool_data) {
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87 log_ereport(LOG_FAILURE, "Cannot create resource pool data: pool: %s type: %s", name.ptr, type.ptr);
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88 return 1;
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89 }
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90
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91 respool->name = respool_name;
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92 respool->type = restype;
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93 respool->data = respool_data;
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94 respool->min = 4; // TODO: get from node
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95 respool->max = RESOURCE_POOL_MAX_DEFAULT; // TODO: get from node
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96
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97 respool->numcreated = 0;
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98 respool->numresources = 0;
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99
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100
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101 // don't allow too large resource pools
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102 // this prevents the need to check malloc integer overflows
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103 if(respool->max > RESOURCE_POOL_MAX_ALLOC) {
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104 respool->max = RESOURCE_POOL_MAX_ALLOC;
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105 log_ereport(LOG_WARN, "Resource pool %s: limit max to %d", name.ptr, respool->max);
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106 }
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107
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108 respool->resalloc = respool->max;
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109 respool->resources = pool_malloc(cfg->pool, respool->resalloc * sizeof(ResourceDataPrivate*));
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110
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111 if(!respool->resources || cxMapPut(cfg->resources, cx_hash_key_bytes((unsigned const char*)name.ptr, name.length), respool)) {
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112 log_ereport(LOG_FAILURE, "Cannot add resource pool: OOM");
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113 // the only cleanup we have to do
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114 restype->destroy(respool_data);
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115 return 1;
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116 }
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117
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118 pthread_mutex_init(&respool->lock, NULL);
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119 pthread_cond_init(&respool->available, NULL);
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120
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121 return 0;
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122 }
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123
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124 static ResourceData* s_resourcepool_lookup(ServerConfiguration *cfg, Request *opt_rq, Session *opt_sn, const char *name, int flags) {
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125 NSAPIRequest *request = (NSAPIRequest*)opt_rq;
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126 NSAPISession *session = (NSAPISession*)opt_sn;
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127 ResourceDataPrivate *resource = NULL;
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128
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129 // was this resource already used by this request?
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130 if(request && request->resources) {
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131 resource = cxMapGet(request->resources, cx_hash_key_str(name));
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132 if(resource) {
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133 return &resource->data;
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134 }
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135 }
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136
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137 ResourcePool *respool = cxMapGet(cfg->resources, cx_hash_key_str(name));
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138 if(!respool) return NULL;
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139
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140
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141 pthread_mutex_lock(&respool->lock);
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142 WSBool createResource = FALSE;
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143 if(respool->numcreated < respool->min) {
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144 createResource = TRUE;
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145 }
260
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146
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147 if(createResource) {
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148 // create a new resource and store it in the resourcepool
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149 log_ereport(LOG_DEBUG, "resourcepool %s: create resource", name);
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150
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151 void *resourceData = respool->type->createresource(respool->data);
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152 if(resourceData) {
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153 respool->numcreated++;
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154
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155 resource = pool_malloc(respool->pool, sizeof(ResourceDataPrivate));
272
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156 if(resource) {
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157 resource->data.data = respool->type->getresourcedata(resourceData);
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158 resource->data.resourcepool = respool;
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159 resource->resdata = resourceData;
272
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160 } else {
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161 respool->type->freeresource(respool->data, resourceData);
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162 log_ereport(LOG_CATASTROPHE, "resourcepool_lookup: OOM");
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163 }
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164 }
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165 // else: respool->type->createresource does logging in case of errors
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166 } else if(respool->numresources > 0) {
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167 resource = respool->resources[--respool->numresources];
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168 } else {
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169 // wait for free resource
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170 pthread_cond_wait(&respool->available, &respool->lock);
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171 if(respool->numresources > 0) {
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172 resource = respool->resources[--respool->numresources];
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173 }
260
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174 }
272
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175
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176 // save the resource in the request object, for caching and also
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177 // for cleanup later
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178 int err = 0;
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179 if(resource) {
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180 if(request && session) {
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181 if(!request->resources) {
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182 request->resources = cxHashMapCreate(pool_allocator(session->sn.pool), CX_STORE_POINTERS, 8);
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183 }
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184
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185 if(request->resources) {
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186 if(cxMapPut(request->resources, cx_hash_key_str(name), resource)) {
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187 err = 1;
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188 }
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189 } else {
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190 err = 1;
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191 }
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192 } // else: lookup is outside of any request context
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193
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194 if(respool->type->prepare(respool->data, resource->resdata)) {
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195 err = -1;
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196 }
272
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197 }
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198
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199 if(err) {
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200 // err == 1 caused by OOM
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201 log_ereport(LOG_FAILURE, "resourcepool_lookup: OOM");
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202 // cleanup
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203 resourcepool_destroy_resource(resource);
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204 resource = NULL;
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205 }
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206
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207 pthread_mutex_unlock(&respool->lock);
269
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208
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209 return (ResourceData*)resource;
260
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210 }
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211
371
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212 ResourceData* resourcepool_cfg_lookup(ServerConfiguration *cfg, const char *name, int flags) {
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213 return s_resourcepool_lookup(cfg, NULL, NULL, name, flags);
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214 }
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215
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216 ResourceData* resourcepool_lookup(Session *sn, Request *rq, const char *name, int flags) {
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217 NSAPISession *session = (NSAPISession*)sn;
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218 ServerConfiguration *cfg = session->config;
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219 return s_resourcepool_lookup(cfg, rq, sn, name, flags);
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220 }
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221
272
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222 void resourcepool_free(Session *sn, Request *rq, ResourceData *resource) {
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223 NSAPIRequest *nsapi_rq = (NSAPIRequest *)rq;
272
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224 ResourceDataPrivate *res = (ResourceDataPrivate*)resource;
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225 ResourcePool *respool = resource->resourcepool;
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226
460
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227 if(nsapi_rq && !nsapi_rq->finished) {
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228 // request processing still ongoing and SAFs will be executed
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229 if(!cxMapRemoveAndGet(nsapi_rq->resources, cx_hash_key_str(respool->name))) {
460
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230 log_ereport(LOG_FAILURE, "resourcepool_free: cannot remove resource from request: potential double free");
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231 }
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232 }
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233 // else: safe to ignore nsapi_rq->resources
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234
283
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235 if(respool->type->finish(respool->data, res->resdata)) {
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236 log_ereport(LOG_FAILURE, "resourcepool_free: finish failed");
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237 }
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238
272
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239 pthread_mutex_lock(&respool->lock);
260
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240
272
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241 if(respool->numresources >= respool->resalloc) {
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242 // actually respool->resalloc == respool->max
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243 // and numresources should always be smaller
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244 // however just be extra safe here
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245 respool->resalloc += 8;
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246 ResourceDataPrivate **new_res_array = pool_realloc(
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247 respool->pool,
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248 respool->resources,
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249 respool->resalloc * sizeof(ResourceDataPrivate*));
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250 if(new_res_array) {
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251 respool->resources = new_res_array;
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252 } else {
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253 log_ereport(LOG_FAILURE, "resourcepool_free: OOM");
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254 resourcepool_destroy_resource(res);
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255 pthread_mutex_unlock(&respool->lock);
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256 return;
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257 }
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258 }
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259
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260 respool->resources[respool->numresources++] = res;
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261
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262 pthread_cond_signal(&respool->available);
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263 pthread_mutex_unlock(&respool->lock);
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264 }
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265
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266 void resourcepool_destroy_resource(ResourceDataPrivate *res) {
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267 res->data.resourcepool->numcreated--;
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268 res->data.resourcepool->type->freeresource(res->data.resourcepool->data, res->resdata);
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269 pool_free(res->data.resourcepool->pool, res);
260
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270 }
269
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271
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272 void resourcepool_destroy(ResourcePool *respool) {
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273 // TODO
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274 }

mercurial