mirror of
https://github.com/sogou/workflow.git
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146 lines
3.0 KiB
C++
146 lines
3.0 KiB
C++
/*
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Copyright (c) 2020 Sogou, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author: Xie Han (xiehan@sogou-inc.com)
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*/
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include "rbtree.h"
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#include "WFNameService.h"
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struct WFNSPolicyEntry
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{
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struct rb_node rb;
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WFNSPolicy *policy;
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char name[1];
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};
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int WFNameService::add_policy(const char *name, WFNSPolicy *policy)
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{
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struct rb_node **p = &this->root.rb_node;
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struct rb_node *parent = NULL;
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struct WFNSPolicyEntry *entry;
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int n, ret = -1;
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pthread_rwlock_wrlock(&this->rwlock);
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while (*p)
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{
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parent = *p;
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entry = rb_entry(*p, struct WFNSPolicyEntry, rb);
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n = strcasecmp(name, entry->name);
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if (n < 0)
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p = &(*p)->rb_left;
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else if (n > 0)
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p = &(*p)->rb_right;
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else
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break;
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}
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if (!*p)
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{
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size_t len = strlen(name);
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size_t size = offsetof(struct WFNSPolicyEntry, name) + len + 1;
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entry = (struct WFNSPolicyEntry *)malloc(size);
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if (entry)
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{
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memcpy(entry->name, name, len + 1);
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entry->policy = policy;
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rb_link_node(&entry->rb, parent, p);
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rb_insert_color(&entry->rb, &this->root);
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ret = 0;
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}
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}
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else
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errno = EEXIST;
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pthread_rwlock_unlock(&this->rwlock);
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return ret;
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}
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inline struct WFNSPolicyEntry *WFNameService::get_policy_entry(const char *name)
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{
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struct rb_node *p = this->root.rb_node;
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struct WFNSPolicyEntry *entry;
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int n;
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while (p)
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{
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entry = rb_entry(p, struct WFNSPolicyEntry, rb);
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n = strcasecmp(name, entry->name);
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if (n < 0)
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p = p->rb_left;
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else if (n > 0)
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p = p->rb_right;
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else
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return entry;
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}
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return NULL;
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}
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WFNSPolicy *WFNameService::get_policy(const char *name)
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{
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WFNSPolicy *policy = this->default_policy;
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struct WFNSPolicyEntry *entry;
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if (this->root.rb_node)
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{
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pthread_rwlock_rdlock(&this->rwlock);
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entry = this->get_policy_entry(name);
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if (entry)
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policy = entry->policy;
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pthread_rwlock_unlock(&this->rwlock);
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}
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return policy;
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}
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WFNSPolicy *WFNameService::del_policy(const char *name)
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{
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WFNSPolicy *policy = NULL;
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struct WFNSPolicyEntry *entry;
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pthread_rwlock_wrlock(&this->rwlock);
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entry = this->get_policy_entry(name);
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if (entry)
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{
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policy = entry->policy;
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rb_erase(&entry->rb, &this->root);
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}
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pthread_rwlock_unlock(&this->rwlock);
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free(entry);
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return policy;
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}
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WFNameService::~WFNameService()
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{
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struct WFNSPolicyEntry *entry;
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while (this->root.rb_node)
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{
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entry = rb_entry(this->root.rb_node, struct WFNSPolicyEntry, rb);
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rb_erase(&entry->rb, &this->root);
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free(entry);
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}
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}
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