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优化域名解析

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This commit is contained in:
老九 2021-09-07 10:26:21 +08:00
parent 977c69b9f8
commit 37bfc3db83
1 changed files with 30 additions and 16 deletions
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46
FastGithub.DomainResolve/DomainResolver.cs
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@ -83,16 +83,7 @@ namespace FastGithub.DomainResolve
try
{
await semaphore.WaitAsync();
for (var i = 0; i < 2; i++)
{
var address = await this.ResolveCoreAsync(domain, cancellationToken);
if (address != null)
{
return address;
}
}
throw new FastGithubException($"当前解析不到{domain.Host}可用的ip，请刷新重试");
return await this.ResolveCoreAsync(domain, cancellationToken);
}
finally
{
@ -106,8 +97,9 @@ namespace FastGithub.DomainResolve
/// <param name="domain"></param>
/// <param name="cancellationToken"></param>
/// <exception cref="OperationCanceledException"></exception>
/// <exception cref="FastGithubException"></exception>
/// <returns></returns>
private async Task<IPAddress?> ResolveCoreAsync(DnsEndPoint domain, CancellationToken cancellationToken)
private async Task<IPAddress> ResolveCoreAsync(DnsEndPoint domain, CancellationToken cancellationToken)
{
if (this.domainResolveCache.TryGetValue<IPAddress>(domain, out var address) && address != null)
{
@ -115,10 +107,7 @@ namespace FastGithub.DomainResolve
}
var expiration = this.dnscryptExpiration;
if (this.dnscryptProxy.LocalEndPoint != null)
{
address = await this.LookupAsync(this.dnscryptProxy.LocalEndPoint, domain, cancellationToken);
}
address = await this.LookupByDnscryptAsync(domain, cancellationToken);
if (address == null)
{
@ -128,7 +117,7 @@ namespace FastGithub.DomainResolve
if (address == null)
{
return null;
throw new FastGithubException($"当前解析不到{domain.Host}可用的ip，请刷新重试");
}
// 往往是被污染的dns
@ -141,6 +130,31 @@ namespace FastGithub.DomainResolve
return address;
}
/// <summary>
/// Dnscrypt查找ip
/// </summary>
/// <param name="domain"></param>
/// <param name="cancellationToken"></param>
/// <param name="maxTryCount"></param>
/// <returns></returns>
private async Task<IPAddress?> LookupByDnscryptAsync(DnsEndPoint domain, CancellationToken cancellationToken, int maxTryCount = 2)
{
if (this.dnscryptProxy.LocalEndPoint != null)
{
for (var i = 0; i < maxTryCount; i++)
{
var address = await this.LookupAsync(this.dnscryptProxy.LocalEndPoint, domain, cancellationToken);
if (address != null)
{
return address;
}
}
}
return default;
}
/// <summary>
/// 回退查找ip
/// </summary>