使用Powershell解析日志文件，并发送电子邮件通知

Question

Thank you for taking time and helping me out,

I am trying to create powershell script to read from log file. If "Buy" or "sell" word found then send me an email notification, The script should read last line only and once only, else multiple notifications

location of the log file "C:\\Program Files\\LMFX MetaTrader 4 Terminal\\MQL4\\Logs\\20181206.log"

> tail -5 (last 5 entry of the log file) 0  19:44:20.644    indicator1
> EURUSD,Daily: initialized 0   19:44:20.644    indicator2 EURUSD,Daily:
> initialized 0 19:44:20.645    indicator3 EURUSD,Daily: initialized
> 0 19:44:20.646    indicator4 EURUSD,Daily: initialized
> 0 19:44:20.659    indicator5 EURUSD,Daily: Alert:  ! BUY !  -  EURUSD
> 0 19:44:20.659    indicator5 EURUSD,Daily: Alert:  ! SELL !  -  EURUSD

`

#Powershell Script
$logDir = "C:\Program Files\LMFX MetaTrader 4 Terminal\MQL4\Logs"

function Send-ToEmail([string]$email){
$user = "Sender@email.com"
$pass = ConvertTo-SecureString -String "PASSWORD" -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential $user, $pass
$body = ":("
$mailParam = @{
    To = "Sender@email.com"
    From = "ALERT ALERT <Reciever@email.com>"
    Subject = "ALERT ALERT ALERT ALERT"
    Body = $body
    SmtpServer = "smtp.gmail.com"
    Port = 587
    Credential = $cred
    #Attachments = "none"     
}

# Send the email with all parameters
Send-MailMessage @mailParam -UseSsl

}

# create a variable to store the previous log line in
$previousLogLine = ''
while ($true) {
$latestLog = Get-ChildItem -Path $logDir -Filter '*.log' | Sort-Object 
LastWriteTime -Descending | Select-Object -First 1
Write-Host "Reading from $($latestLog.Name)"

$logLine = Get-Content -Path $latestLog.FullName -Tail 1
# if this line is different from the previously stored line
# and it contains either "sell" or "buy", then send the email
if ($logLine -ne $previousLogLine -and $logLine -match 'sell|buy') { 
    Send-ToEmail -email "Reciever@email.com"
    # remember this line to compare with the line we get in the next 
    iteration
    $previousLogLine = $logLine
    }
    Start-Sleep -Seconds 1
    cls
   }
`

Answer 1

Change your last part to following, I don't think -wait switch is suitable in this case. Use an array to store all items sent.

while ($true) {
$sent = @()
Get-Content -Path "C:\Program Files (x86)\Tickmill MT4 Client Terminal\MQL4\Logs\$latest" -Tail 1 | %{if(($_ -match "sell" -or $_ -match "buy") -and $sent -notcontains $_){Send-ToEmail  -email "receiver@email.com"; $sent += $_}}

start-sleep 2

}

Answer 2

I think what you need to do is to:

1. check the latest log file inside the loop
2. remember the last line that contained "buy" or "sell" in order not to send the same line as email over and over again

Perhaps something like this:

$logDir = "C:\Program Files (x86)\Tickmill MT4 Client Terminal\MQL4\Logs\"

function Send-ToEmail([string]$email){
    $user = "sender@email.com"
    $pass = ConvertTo-SecureString -String "PASSWORD" -AsPlainText -Force
    $cred = New-Object System.Management.Automation.PSCredential $user, $pass
    $body = ":("
    $mailParam = @{
        To = "sender@email.com"
        From = "ALERT ALERT <Reciever@email.com>"
        Subject = "ALERT : #tail last line"
        Body = $body 
        SmtpServer = "smtp.gmail.com"
        Port = 587
        Credential = $cred
        #Attachments = "none"     
    }

    # Send the email with all parameters
    Send-MailMessage @mailParam -UseSsl
 }

# create a variable to store the previous log line in
$previousLogLine = ''
while ($true) {
    $latestLog = Get-ChildItem -Path $logDir -Filter '*.log' | Sort-Object LastWriteTime -Descending | Select-Object -First 1
    Write-Host "Reading from $($latestLog.Name)"

    $logLine = Get-Content -Path $latestLog.FullName -Tail 1
    # if this line is different from the previously stored line
    # and it contains either "sell" or "buy", then send the email
    if ($logLine -ne $previousLogLine -and $logLine -match 'sell|buy') { 
        Send-ToEmail -email "receiver@email.com"
        # remember this line to compare with the line we get in the next iteration
        $previousLogLine = $logLine
    }

    Start-Sleep -Seconds 2
}

As you can see, I've also changed LastAccessTime into LastWriteTime for the file, because I think that is more appropriate. After testing, don't forget to change this line To = "sender@email.com" into To = $email .

Hope that helps