public void AddOrUpdateCache(string requestUrl, Stream httpBytesStream, DateTime lastModified, int expireInSeconds)
{
if (httpBytesStream == null)
{
return;
}
var bodyBuf = httpBytesStream.ReadAllBytes();
//由于浏览器发送过来的报文头中的If-Modified-since字段没有精确到毫秒，所有写到缓存的lastModified也不应该精确到毫秒
var cachedData = new CacheData {
Url = requestUrl, HttpBodyBytes = bodyBuf, LastModified = lastModified.OmitMillisecond()
};
if (redisClient.Exists(cachedData.Url) > 0)
{
redisClient.Del(cachedData.Url);
}
redisClient.Set <CacheData>(cachedData.Url, cachedData);
Expire(cachedData.Url, expireInSeconds);
}
/// <summary>
/// 单纯获取缓存日志中的对应行，不考虑缓存过期与否
/// </summary>
/// <param name="requestUrl"></param>
/// <returns></returns>
private CacheData GetCache(string requestUrl)
{
CacheData r = null;
if (!File.Exists(cacheFile))
{
return(r);
}
using (StreamReader sr = new StreamReader(cacheFile))
{
do
{
string line = sr.ReadLine();
if (line == null || line == "")
{
break;
}
var strs = line.Split('@');
string theUrl = strs[0];
DateTime lastModified = DateTime.Parse(strs[1]);
int exp = -1;
int.TryParse(strs[2], out exp);
string theCachedPageName = strs[3];
if (requestUrl == theUrl)
{
var cachedHtmlPath = string.Format(@"{0}\{1}", htmlCachePath, theCachedPageName);
var buf = File.ReadAllBytes(cachedHtmlPath);
r = new CacheData {
Url = theUrl, LastModified = lastModified, CachedHtmlFile = theCachedPageName, HttpBodyBytes = buf, ExpireInSeconds = exp
};
break;
}
} while (true);
sr.Close();
}
return(r);
}
private void DeleteCacheFile(CacheData existedCacheItem)
{
File.Delete(string.Format(@"{0}\CachedHtml\{1}", baseDir, existedCacheItem.CachedHtmlFile));
}
