sqlnotebook.psm1

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#------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
#------------------------------------------------------------

Set-StrictMode -Version Latest

function Invoke-SqlNotebook {

    [CmdletBinding(DefaultParameterSetName="ByConnectionParameters")]

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUsePSCredentialType", "Username", Justification="Intentionally allowing User/Password, in addition to a PSCredential parameter.")]
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingPlainTextForPassword", "Password", Justification="Intentionally allowing User/Password, in addition to a PSCredential parameter.")]
    [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingUsernameAndPasswordParams", "", Justification="Intentionally allowing User/Password, in addition to a PSCredential parameter.")]

    # Parameters
    param(
        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionParameters')]$ServerInstance,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionParameters')]$Database,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionParameters')][ValidateNotNullorEmpty()]$Username,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionParameters')][ValidateNotNullorEmpty()]$Password,

        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionString')][ValidateNotNullorEmpty()]$ConnectionString,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true, ParameterSetName = 'ByConnectionParameters')][ValidateNotNullorEmpty()][PSCredential]$Credential,
        [Parameter(Mandatory = $true, ParameterSetName='ByInputFile')]
        [Parameter(ParameterSetName = 'ByConnectionParameters')]
        [Parameter(ParameterSetName = 'ByConnectionString')]$InputFile,
        [Parameter(Mandatory = $true, ValueFromPipeline = $true, ParameterSetName='ByInputObject')]
        [Parameter(ParameterSetName = 'ByConnectionParameters')]
        [Parameter(ParameterSetName = 'ByConnectionString')]$InputObject,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true)][ValidateNotNullorEmpty()]$OutputFile,

        [Switch]$Force
    )

    #Checks to see if OutputFile is given
    #If it is, checks to see if extension is there
    function getOutputFile($inputFile,$outputFile) {
        if($outputFile) {
            $extn = [IO.Path]::GetExtension($outputFile)
            if ($extn.Length -eq 0) {
                $outputFile = ($outputFile + ".ipynb")
            }
            $outputFile
        }
        else {
            #If User does not define Output it will use the inputFile file location
            $fileinfo = Get-Item $inputFile

            # Create an output file based on the file path of input and name
            Join-Path $fileinfo.DirectoryName ($fileinfo.BaseName + "_out" + $fileinfo.Extension)
        }
    }

    #Validates InputFile and Converts InputFile to Json Object
    function getFileContents($inputfile) {

        if (-not (Test-Path -Path $inputfile)) {
            Throw New-Object System.IO.FileNotFoundException ($inputfile + " does not exist")
        }

        $fileItem = Get-Item $inputfile

        #Checking if file is a python notebook
        if ($fileItem.Extension -ne ".ipynb") {
            Throw New-Object System.FormatException "Only ipynb files are supported"
        }

        $fileContent = Get-Content $inputfile
        try {
            $fileContentJson = ($fileContent | ConvertFrom-Json)
        }
        catch {
            Throw New-Object System.FormatException "Malformed Json file"
        }
        $fileContentJson
    }

    #Validate SQL Kernel Notebook
    function validateKernelType($fileContentJson) {
        if ($fileContentJson.metadata.kernelspec.name -ne "SQL") {
            Throw New-Object System.NotSupportedException "Kernel type '$($fileContentJson.metadata.kernelspec.name)' not supported."
        }
    }

    #Validate non-existing output file
    #If file exists and $throwifexists, an exception is thrown.
    function validateExistingOutputFile($outputfile, $throwifexists) {
        if ($outputfile -and (Test-Path $outputfile) -and $throwifexists) {
            Throw New-Object System.IO.IOException "The file '$($outputfile)' already exists. Please, specify -Force to overwrite it."
        }
    }

    #Parsing Notebook Data to Notebook Output
    function ParseTableToNotebookOutput {
        param (
            [System.Data.DataTable]
            $DataTable,

            [int]
            $CellExecutionCount
        )
        $TableHTMLText = "<table>"
        $TableSchemaFeilds = @()
        $TableHTMLText += "<tr>"
        foreach ($ColumnName in $DataTable.Columns) {
            $TableSchemaFeilds += @(@{name = $ColumnName.toString() })
            $TableHTMLText += "<th>" + $ColumnName.toString() + "</th>"
        }
        $TableHTMLText += "</tr>"
        $TableSchema = @{ }
        $TableSchema["fields"] = $TableSchemaFeilds

        $TableDataRows = @()
        foreach ($Row in $DataTable) {
            $TableDataRow = [ordered]@{ }
            $TableHTMLText += "<tr>"
            $i = 0
            foreach ($Cell in $Row.ItemArray) {
                $TableDataRow[$i.ToString()] = $Cell.toString()
                $TableHTMLText += "<td>" + $Cell.toString() + "</td>"
                $i++
            }
            $TableHTMLText += "</tr>"
            $TableDataRows += $TableDataRow
        }

        $TableDataResource = @{ }
        $TableDataResource["schema"] = $TableSchema
        $TableDataResource["data"] = $TableDataRows
        $TableData = @{ }
        $TableData["application/vnd.dataresource+json"] = $TableDataResource
        $TableData["text/html"] = $TableHTMLText
        $TableOutput = @{ }
        $TableOutput["output_type"] = "execute_result"
        $TableOutput["data"] = $TableData
        $TableOutput["metadata"] = @{ }
        $TableOutput["execution_count"] = $CellExecutionCount
        return $TableOutput
    }

    #Parsing the Error Messages to Notebook Output
    function ParseQueryErrorToNotebookOutput {
        param (
            $QueryError
        )
        <#
        Following the current syntax of errors in T-SQL notebooks from ADS
        #>

        $ErrorString = "Msg " + $QueryError.Exception.InnerException.Number +
        ", Level " + $QueryError.Exception.InnerException.Class +
        ", State " + $QueryError.Exception.InnerException.State +
        ", Line " + $QueryError.Exception.InnerException.LineNumber +
        "`r`n" + $QueryError.Exception.Message

        $ErrorOutput = @{ }
        $ErrorOutput["output_type"] = "error"
        $ErrorOutput["traceback"] = @()
        $ErrorOutput["evalue"] = $ErrorString
        return $ErrorOutput
    }

    #Parsing Messages to Notebook Output
    function ParseStringToNotebookOutput {
        param (
            [System.String]
            $InputString
        )
        <#
        Parsing the string to notebook cell output.
        It's the standard Jupyter Syntax
        #>

        $StringOutputData = @{ }
        $StringOutputData["text/html"] = $InputString
        $StringOutput = @{ }
        $StringOutput["output_type"] = "display_data"
        $StringOutput["data"] = $StringOutputData
        $StringOutput["metadata"] = @{ }
        return $StringOutput
    }

    #Start of Script
    #Checks to see if InputFile or InputObject was entered

    #Checks to InputFile Type and initializes OutputFile
    switch ($InputFile) {
        {$_ -is [System.String]} {
            $fileInformation = getFileContents($_)
            $fileContent = $fileInformation[0]
            $OutputFile = getOutputFile $_  $OutputFile
            break
        }
        {$_ -is [System.IO.FileInfo]} {
            $fileInformation = getFileContents($_.FullName)
            $fileContent = $fileInformation[0]
            $OutputFile = getOutputFile $_ $OutputFile
            break
        }
        default {
            $fileContent = $InputObject
        }
    }

    #Checks InputObject and converts that to appropriate Json object
    switch ($InputObject) {
        {$_ -is [System.String]} {
            $fileContentJson = ($InputObject | ConvertFrom-Json)
            $fileContent = $fileContentJson[0]
        }
    }

    #Validates only SQL Notebooks
    validateKernelType $fileContent

    #Validate that $OutputFile does not exist, or, if it exists a -Force was passed in.
    validateExistingOutputFile $OutputFile (-not $Force)

    #Setting params for Invoke-Sqlcmd
    $DatabaseQueryHashTable = @{ }

    #Checks to see if User entered ConnectionString or individual parameters
    if($ConnectionString) {
        $DatabaseQueryHashTable["ConnectionString"] = $ConnectionString
    }else{
        if ($ServerInstance) {
            $DatabaseQueryHashTable["ServerInstance"] = $ServerInstance
        }
        if ($Database) {
            $DatabaseQueryHashTable["Database"] = $Database
        }
        #Checks to see if User entered Credential or individual parameters
        if($Credential) {
            $DatabaseQueryHashTable["Credential"] = $Credential
        }else{
            if ($Username) {
                $DatabaseQueryHashTable["Username"] = $Username
            }
            if ($Password) {
                $DatabaseQueryHashTable["Password"] = $Password
            }
        }
    }

    #Setting additional parameters for Invoke-SQLCMD to get
    #all the information from Notebook execution to output
    $DatabaseQueryHashTable["Verbose"] = $true
    $DatabaseQueryHashTable["ErrorVariable"] = "SqlQueryError"
    $DatabaseQueryHashTable["OutputAs"] = "DataTables"

    #The first code cell number
    $cellExecutionCount = 1
    #Iterate through Notebook Cells
    $fileContent.cells | Where-Object {
        # Ignoring Markdown or raw cells
        $_.cell_type -ne "markdown" -and $_.cell_type -ne "raw" -and $_.source -ne ""
    } | ForEach-Object {
        $NotebookCellOutputs = @()

        # Getting the source T-SQL from the cell
        #$DatabaseQueryHashTable["Query"] = $_.source
        switch($_.source) {
            {($_.getType().FullName) -is [System.Object[]]} {
                $DatabaseQueryHashTable["Query"] = ($_ -join "`r`n" | Out-String)
                break
            }
            {$_.getType().FullName -is [System.String]} {
                $DatabaseQueryHashTable["Query"] = $_
                break
            }
        }

        # Executing the T-SQL Query and storing the result and the time taken to execute
        $SqlQueryExecutionTime = Measure-Command {
            [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseDeclaredVarsMoreThanAssignments", "SqlQueryResult", Justification="Suppressing false warning.")]
            $SqlQueryResult = @( Invoke-Sqlcmd @DatabaseQueryHashTable -ErrorAction SilentlyContinue 4>&1)
        }

        # Setting the Notebook Cell Execution Count
        # to increase count of each code cell
        $_.execution_count = $cellExecutionCount++

        $NotebookCellTableOutputs = @()

        <#
        Iterating over the results by Invoke-Sqlcmd
        There are 2 types of errors:
        1. Verbose Output: Print Statements:
            These needs to be added to the beginning of the cell outputs
        2. Datatables from the database
            These needs to be added to the end of cell outputs
        #>

        $SqlQueryResult | ForEach-Object {
            switch ($_) {
                { $_ -is [System.Management.Automation.VerboseRecord] } {
                    # Adding the print statments to the cell outputs
                    $NotebookCellOutputs += $(ParseStringToNotebookOutput($_.Message))
                    break
                }
                { $_ -is [System.Data.DataTable] } {
                    # Storing the print Tables into an array to be added later to the cell output
                    $NotebookCellTableOutputs += $(ParseTableToNotebookOutput $_  $CellExecutionCount)
                    break
                }
                { $_ -is [System.Data.DataRow] } {
                    # Storing the print row into an array to be added later to the cell output
                    $NotebookCellTableOutputs += $(ParseTableToNotebookOutput $_.Table  $CellExecutionCount)
                    break
                }
            }
        }

        if ($SqlQueryError) {
            # Adding the parsed query error from Invoke-Sqlcmd
            $NotebookCellOutputs += $(ParseQueryErrorToNotebookOutput($SqlQueryError))
        }

        if ($SqlQueryExecutionTime) {
            # Adding the parsed execution time from Measure-Command
            $NotebookCellExcutionTimeString = "Total execution time: " + $SqlQueryExecutionTime.ToString()
            $NotebookCellOutputs += $(ParseStringToNotebookOutput($NotebookCellExcutionTimeString))
        }

        # Adding the data tables
        $NotebookCellOutputs += $NotebookCellTableOutputs
        $_.outputs = $NotebookCellOutputs
    }

    # This will update the Output file according to the executed output of the notebook
    if ($OutputFile) {
        ($fileContent | ConvertTo-Json -Depth 100 ) | Out-File  -Encoding Ascii -FilePath $OutputFile
        Get-Item $OutputFile
    }
    else {
        $fileContent | ConvertTo-Json -Depth 100
    }
}

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