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dns解析重试

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This commit is contained in:
老九 2021-08-29 23:17:34 +08:00
parent 8cc28f5f47
commit 14aa806058
1 changed files with 31 additions and 20 deletions
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51
FastGithub.DomainResolve/DomainResolver.cs
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@ -81,7 +81,7 @@ namespace FastGithub.DomainResolve
try
{
await semaphore.WaitAsync();
return await this.LookupAsync(domain, cancellationToken);
return await this.ResolveNoCacheAsync(domain, cancellationToken);
}
finally
{
@ -90,12 +90,13 @@ namespace FastGithub.DomainResolve
}
/// <summary>
/// 查找ip
/// 解析域名
/// 不使用缓存
/// </summary>
/// <param name="domain"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private async Task<IPAddress> LookupAsync(DnsEndPoint domain, CancellationToken cancellationToken)
private async Task<IPAddress> ResolveNoCacheAsync(DnsEndPoint domain, CancellationToken cancellationToken)
{
if (this.domainResolveCache.TryGetValue<IPAddress>(domain, out var address))
{
@ -105,7 +106,7 @@ namespace FastGithub.DomainResolve
var expiration = this.dnscryptExpiration;
if (this.dnscryptProxy.LocalEndPoint != null)
{
address = await this.LookupCoreAsync(this.dnscryptProxy.LocalEndPoint, domain, cancellationToken);
address = await this.LookupAsync(this.dnscryptProxy.LocalEndPoint, domain, cancellationToken);
}
if (address == null)
@ -140,7 +141,7 @@ namespace FastGithub.DomainResolve
{
foreach (var dns in this.fastGithubConfig.FallbackDns)
{
var address = await this.LookupCoreAsync(dns, domain, cancellationToken);
var address = await this.LookupAsync(dns, domain, cancellationToken);
if (address != null)
{
return address;
@ -149,7 +150,6 @@ namespace FastGithub.DomainResolve
return default;
}
/// <summary>
/// 查找ip
/// </summary>
@ -157,22 +157,33 @@ namespace FastGithub.DomainResolve
/// <param name="domain"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private async Task<IPAddress?> LookupCoreAsync(IPEndPoint dns, DnsEndPoint domain, CancellationToken cancellationToken)
private async Task<IPAddress?> LookupAsync(IPEndPoint dns, DnsEndPoint domain, CancellationToken cancellationToken)
{
try
const int MAX_TRY_COUNT = 2;
for (var i = 0; i < MAX_TRY_COUNT; i++)
{
var dnsClient = new DnsClient(dns);
using var timeoutTokenSource = new CancellationTokenSource(this.lookupTimeout);
using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutTokenSource.Token);
var addresses = await dnsClient.Lookup(domain.Host, RecordType.A, linkedTokenSource.Token);
addresses = addresses.Where(address => this.disableIPAddressCache.TryGetValue(address, out _) == false).ToList();
return await this.FindFastValueAsync(addresses, domain.Port, cancellationToken);
}
catch (Exception ex)
{
this.logger.LogWarning($"dns({dns})无法解析{domain.Host}：{ex.Message}");
return default;
try
{
var dnsClient = new DnsClient(dns);
using var timeoutTokenSource = new CancellationTokenSource(this.lookupTimeout);
using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutTokenSource.Token);
var addresses = await dnsClient.Lookup(domain.Host, RecordType.A, linkedTokenSource.Token);
addresses = addresses.Where(address => this.disableIPAddressCache.TryGetValue(address, out _) == false).ToList();
return await this.FindFastValueAsync(addresses, domain.Port, cancellationToken);
}
catch (OperationCanceledException)
{
continue;
}
catch (Exception ex)
{
this.logger.LogWarning($"dns({dns})无法解析{domain.Host}：{ex.Message}");
return default;
}
}
this.logger.LogWarning($"dns({dns})无法解析{domain.Host}");
return default;
}
@ -220,7 +231,7 @@ namespace FastGithub.DomainResolve
}
catch (OperationCanceledException)
{
this.SetDisabled(address, TimeSpan.FromMilliseconds(1d));
this.SetDisabled(address, TimeSpan.FromMilliseconds(2d));
return default;
}
catch (Exception)