通过运行状况检查减少日志文件读取的数量

Question

我有此.NET健康检查：

public Task<HealthCheckResult> CheckHealthAsync(
            HealthCheckContext context,
            CancellationToken cancellationToken = default)
{
    Regex ConnectedRegex = new Regex(_healthOptions.ConnectedRegex);
    Regex ConnectionRefusedRegex = new Regex(_healthOptions.ConnectionRefusedRegex);
    Regex ErrorRegex = new Regex(_healtOptions.ErrorRegex);
    int ConnectedRegexLine = GetLogLine(ConnectedRegex);
    int ConnectionRefusedRegexLine = GetLogLine(ConnectionRefusedRegex);
    int ErrorRegexLine = GetLogLine(ErrorRegex);
    if ((ConnectionRefusedRegexLine > 0 || ErrorRegexLine > 0) &&
        ConnectedRegexLine <= 0)
    {
        return Task.FromResult(HealthCheckResult.Unhealthy());
    }
        return Task.FromResult(HealthCheckResult.Healthy());
    }
}

它需要3个正则表达式值，并找到它们在日志文件中出现的行。

这是我用来获取每一行的方法。

private int GetLogLine(Regex regex)
{
    GetLogFile = DefaultLogFile.GetLogFileName();
    using StreamReader reader = new StreamReader(GetLogFile);
    string line;
    int lineNumber = 0;
    int errorLine = 0;
    while ((line = reader.ReadLine()) != null)
    {
        // Try to match each line against the Regex.
        Match match = regex.Match(line);
        if (match.Success)
        {
            errorLine = lineNumber;
        }
        lineNumber++;
    }
    return errorLine;
}

我意识到每次运行此检查时，我都会读取日志文件3次。我是否可以更改支票，使其仅需读取一次日志文件，但仍为if语句的CheckHealthAsync方法提供行号？如果是这样，我该怎么做？

Answer 1

也许使用正则表达式命名组对您有用？ https://www.regular-expressions.info/refext.html

我没有尝试过，但是拜拜，这是一个选择

    var match = new Regex(string.Join("|",
    $"(<?{nameof(_healthOptions.ConnectedRegex)}>{_healthOptions.ConnectedRegex})",
    $"(<?{nameof(_healthOptions.ConnectionRefusedRegex)}>{_healthOptions.ConnectionRefusedRegex})",
    $"(<?{nameof(_healtOptions.ErrorRegex)}>{_healtOptions.ErrorRegex)})")).Match("inputstring");

if (match.Success)
{
    if (match.Groups.ContainsKey(nameof(_healthOptions.ConnectedRegex)))
    {

    }
    else if (match.Groups.ContainsKey(nameof(_healthOptions.ConnectionRefusedRegex)))
    {
        
    }
    else if (match.Groups.ContainsKey(nameof(_healthOptions.ErrorRegex)))
    {
        
    }
}