YH_DNSCacheManager.m
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//
// YH_DNSCacheManager.m
// YH_Mall
//
// Created by jhsonzhi on 16/7/18.
// Copyright © 2016年 YOHO. All rights reserved.
//
#import "YH_DNSCacheManager.h"
#import "YH_DNSMemoryCache.h"
#import "YH_DNSDomainModel.h"
#import "YH_DNSUtils.h"
#import "YH_DNSHttpDnsPack.h"
@interface YH_DNSCacheManager()
@property (strong, nonatomic) YH_DNSMemoryCache *memoryCacheDic;
@end
@implementation YH_DNSCacheManager
+ (instancetype)sharedInstance {
static YH_DNSCacheManager *sharedInstance = nil;
static dispatch_once_t predicate;
dispatch_once(&predicate, ^{
sharedInstance = [[YH_DNSCacheManager alloc]init];
});
return sharedInstance;
}
- (id)init {
if (self = [super init]) {
_memoryCacheDic = [YH_DNSMemoryCache sharedInstance];
}
return self;
}
- (NSArray *)getExpireDnsCache {
@synchronized(self) {
return [self.memoryCacheDic getExpireDnsCache];
}
}
- (NSArray *)getAllModels {
@synchronized(self) {
return [self.memoryCacheDic getAllModels];
}
}
- (void)addMemoryCache:(NSString *)hostName model:(YH_DNSDomainModel *)model {
@synchronized(self) {
if (model == nil) {
NSLog(@"ERROR:%s:%d model is nil.", __func__, __LINE__);
return;
}
if (model.ipModelArray == nil || model.ipModelArray.count == 0) {
NSLog(@"ERROR:%s:%d model.ipModelArray is nil.", __func__, __LINE__);
return;
}
for (YH_DNSIpModel *ipModel in model.ipModelArray) {
if (!ipModel) {
NSLog(@"WARNING:%s an ipModel in model.ipModelArray is nil.", __func__);
return;
}
}
[self.memoryCacheDic addModel:model keyHost:hostName];
return;
}
}
//本函数只用于更新从本地dns获取的ip， 从httpserver 获取的ip 不应该用此函数更新。
//- (void)updateMemoryCache:(NSString *)domain model:(YH_DNSDomainModel *)model
//{
// @synchronized(self) {
// if (model == nil) {
// NSLog(@"ERROR:%s:%d model is nil.", __func__, __LINE__);
// return;
// }
// if (model.ipModelArray == nil || model.ipModelArray.count == 0) {
// NSLog(@"ERROR:%s:%d model.ipModelArray is nil.", __func__, __LINE__);
// return;
// }
//
// [self.memoryCacheDic updateModel:model keyHost:domain];
// return;
// }
//}
- (NSString *)getRandomIp:(YH_DNSDomainModel *)domainModel{
@synchronized(self) {
NSString *randomIp = nil;
NSInteger modelCount = [domainModel.ipModelArray count];
if (modelCount > 0) {
YH_DNSIpModel *ipModel = domainModel.ipModelArray[arc4random()%modelCount];
randomIp = ipModel.ip;
}
return randomIp;
}
}
- (NSDictionary *)getDnsCacheByHost:(NSString *)hostName {
//这个锁是防止 多个线程重复的 从数据库取数据插入缓存。
@synchronized(self) {
NSMutableDictionary *resultDic = nil;
YH_DNSDomainModel *model = [self.memoryCacheDic getModelByKeyUrl:hostName];
NSString* source = @"memorycache";
//TODO:读取数据库
if (model != nil) {
if ([YH_DNSUtils isDomainModelExpired:model]) {
NSLog(@"INFO:%s:%d model(domain:%@) from %@ is expired.", __func__, __LINE__, model.domain, source);
return nil;
} else if (model.ipModelArray == nil || model.ipModelArray.count == 0) {
NSLog(@"INFO:%s:%d model(domain:%@) from %@ all ip are expired.", __func__, __LINE__, model.domain, source);
return nil;
} else {
//TODO:把数据库里的有效model 存到缓存里。
}
NSString * resultIpString = [self getRandomIp:model];
resultDic = [NSMutableDictionary dictionary];
[resultDic setValue:((!YHDNS_isStrEmpty(resultIpString)) ? resultIpString: @"") forKey:@"ip"];
[resultDic setValue:@(model.isNeedPreFetch) forKey:@"prefetch"];
}
return resultDic;
}
}
- (YH_DNSDomainModel *)insertDnsCache:(YH_DNSHttpDnsPack *) dnsPack {
@synchronized(self) {
YH_DNSDomainModel* model = [[YH_DNSDomainModel alloc]init];
model.domain = dnsPack.domain;
model.time = [[YH_DNSUtils sharedInstance] stringFromDate:[NSDate date]];
NSInteger t = 60;
for (YH_DNSIpModel* tempIp in dnsPack.dns) {
YH_DNSIpModel* ipModel = [[YH_DNSIpModel alloc]init];
ipModel.ip = tempIp.ip;
ipModel.ttl = tempIp.ttl;
ipModel.finally_update_time = [[YH_DNSUtils sharedInstance] stringFromDate:[NSDate date]];
[model.ipModelArray addObject:ipModel];
if ([ipModel.ttl intValue] < t) {
t = [ipModel.ttl intValue];
}
}
model.ttl = [NSString stringWithFormat:@"%zd", t];
if (model.ipModelArray != nil && model.ipModelArray.count > 0) {
[self addMemoryCache:model.domain model:model];
}
return model;
}
}
- (YH_DNSIpModel *)findIpModel:(YH_DNSIpModel *)ipModel inArray:(NSArray *)array {
for (YH_DNSIpModel* modelItem in array) {
if ([modelItem.ip isEqualToString:ipModel.ip]) {
return modelItem;
}
}
return nil;
}
- (void)clear {
@synchronized(self) {
[self clearMemoryCache];
}
}
- (void)clearDB{
}
- (void)clearMemoryCache {
@synchronized(self) {
[self.memoryCacheDic removeAllModels];
}
}
@end