The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Software Development’ Category

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Soap Delphi Client end with a timeout for a 1MB call – Stack Overflow

Posted by jpluimers on 2019/09/26

This was a change between IE6 and IE7 on the default time-out decreasing from 3600 seconds to 30 seconds: [WayBack] Soap Delphi Client end with a timeout for a 1MB call – Stack Overflow.

If you want to increase the timeout, then use InternetSetOption. You can get the current value using InternetQueryOption.

In Delphi, THTTPReqResp.Send supports this by setting the various time out options right after creating the request:

    Request := HttpOpenRequest(FInetConnect, 'POST', PChar(FURLSite), nil,
                               nil, nil, Flags, 0{Integer(Self)});
    Check(not Assigned(Request));

    { Timeouts }
    if FConnectTimeout > 0 then
      Check(not InternetSetOption(Request, INTERNET_OPTION_CONNECT_TIMEOUT, Pointer(@FConnectTimeout), SizeOf(FConnectTimeout)));
    if FSendTimeout > 0 then
      Check(not InternetSetOption(Request, INTERNET_OPTION_SEND_TIMEOUT, Pointer(@FSendTimeout), SizeOf(FSendTimeout)));
    if FReceiveTimeout > 0 then
      Check(not InternetSetOption(Request, INTERNET_OPTION_RECEIVE_TIMEOUT, Pointer(@FReceiveTimeout), SizeOf(FReceiveTimeout)));

Related:

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, SOAP/WebServices, Software Development | Leave a Comment »

does anyone know of any Spring.Container examples (preferably non trivial) th…

Posted by jpluimers on 2019/09/26

Via [WayBack] does anyone know of any Spring.Container examples (preferably non trivial) that show how to build an app with a container just referenced from the Compo… – Russell Weetch – Google+:

Stefan Glienke:

The principle of having a composition root has nothing to do with a particular DI container. Its what you eventually get when following the principle if DI: ask for dependencies – don’t create or look for them yourself (aka service locator).

You did not mention it but I guess you mean a VCL application – now the design of the VCL is not particularly built with DI in mind and thus it can be a bit tricky to hook up the application MainForm to the container to get it injected everything. However there are several examples how to achieve that (mainly by using DelegateTo and doing the Application.CreateForm there).

An example explaining this is for instance in [WayBack] How to initialize main application form in Spring4D GlobalContainer?

Many more can be found through Spring4d DelegateTo and Spring4d DelegateTo CreateForm and

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | Leave a Comment »

Boolean Values and Operators

Posted by jpluimers on 2019/09/26

TL;DR from [WayBack] Automating the world one-liner at a time… Boolean Values and Operators:

In PowerShell use the built-in constants $false and $true, as strings will be converted to booleans with results you don’t like

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | Leave a Comment »

How to expose a Delphi set type via Soap – Stack Overflow

Posted by jpluimers on 2019/09/25

Marjan Venema had a great answer at [WayBack] How to expose a Delphi set type via Soap – Stack Overflow.

–jeroen

Posted in Conference Topics, Conferences, Delphi, Development, Event, SOAP/WebServices, Software Development | Leave a Comment »

PowerShell: count the Windows EventLog entries for Applications over the last 10 minutes

Posted by jpluimers on 2019/09/25

In production, somehow an application started to misbehave, so would spit out a lot of Windows EventLog entries for Applications you can see in the EventViewer. This small script helped counting it (it takes about 10 seconds on a log having a total of 77k entries):

$tenMinutes = New-TimeSpan -Minutes 10
$now = Get-Date
$tenMinutesAgo = $now - $tenMinutes
$eventLogEntries = Get-EventLog -After $tenMinutesAgo -LogName "Application"
$count = ($eventLogEntries | Measure-Object).Count
Write-Host $count

Related:

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | 1 Comment »

On my research list: TensorFlow from other languages

Posted by jpluimers on 2019/09/25

On my research list as it pointed me to TensorFlow imports from both .NET and Delphi: [WayBack] Fixed by Code: Using TensorFlow™ with Delphi – or how to use a TStack<T> to simulate a RPN calculator.

Links from it:

I like the demo there, as I’ve done RPN calculator with some modeling tools before which makes for a good demo, and it reminds me of the HP 12C financial calculator my dad used to have.

If you like more TensorFlow, then watch the video I linked before:  “Large-Scale Deep Learning with TensorFlow,” Jeff Dean – YouTube

Via

Older conversion try: [WayBack] Converting the TensorFlow C++ headers to object pascal. It has this empty struct defined.typedef struct TF_Tensor TF_Tensor;Think it converts to obj… – Eli M – Google+

–jeroen

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Posted in .NET, Delphi, Development, Software Development | Leave a Comment »

Convert an object instance into a JSON string and making use of custom attributes – Flix Engineering

Posted by jpluimers on 2019/09/24

For my link archive, [WayBack] Convert an object instance into a JSON string and making use of custom attributes – Flix Engineering:

JSON, JSONMarshalled, JSONName Delphi Convert an object instance into a JSON string and making use of custom attributes

This is a welcome explanation as in [WayBack] REST.Json.Types – RAD Studio API Documentation, these attributes have very shallow documentation:

Via: [WayBack] Is there any documentation for attribute and Json? uses Rest.Json, Rest.Json.Types; [JSONName(‘TokenName’)] – Thomas Bornhaupt – Google+

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

Fork – a fast and friendly git client for Mac

Posted by jpluimers on 2019/09/24

Works for Windows too: [WayBack] Fork – a fast and friendly git client for Mac.

Via [WayBack] Weekend Reader 2017.46 – reality-loop(who switched away from SourceTree, because, well, that was ahead of it’s time but in the end couldn’t keep up with reality)

–jeroen

Posted in Development, DVCS - Distributed Version Control, git, git-fork, Software Development, Source Code Management, SourceTree | Leave a Comment »

Research list: haproxy and Connection: close

Posted by jpluimers on 2019/09/24

At a site, haproxy was configured like this for a particular back-end:

backend http_FUNCTIONALITY_cluster
    log global
    mode http
# default httpchk checks / which for our functionality intentionally returns 500 causing haproxy to think it's down
#   option httpchk
# FUNCTIONALITY has a /FUNCTIONALITY which returns a 200 OK
    option httpchk get /FUNCTIONALITY
    http-check expect ! rstatus ^5
    option http-keep-alive
    option forwardfor
    server w7connexxion 192.168.178.42:8181 cookie FUNCTIONALITYA check

The /FUNCTIONALITY would return a multi-kilobyte result.

The HAproxy would send the request with this body:

Connection: close

In the midst of the server returning an http request of more than one TCP frame:

Connection: close
Content-Type: text/html; charset=utf-8
Content-Length: 4068
Date: Mon, 20 Nov 2017 08:17:02 GMT

<html><head><META ...

, the HAproxy would kill the connection, resulting in a 10054 error on Windows, which [WayBack] Windows Sockets Error Codes indicates it is this:

WSAECONNRESET
10054
Connection reset by peer.

An existing connection was forcibly closed by the remote host. This normally results if the peer application on the remote host is suddenly stopped, the host is rebooted, the host or remote network interface is disabled, or the remote host uses a hard close (see setsockopt for more information on the SO_LINGER option on the remote socket). This error may also result if a connection was broken due to keep-alive activity detecting a failure while one or more operations are in progress. Operations that were in progress fail with WSAENETRESET. Subsequent operations fail with WSAECONNRESET.

So both sides are right in that they will close the connection (despite the HTTP keep alive): [WayBack] What does “Connection: close” means when used in the response message?

Howver, I think HAproxy is way too soon closing the connection, especially as it does not use the configured keep alive ([WayBack] How to make HA Proxy keepalive and [WayBack] Hypertext Transfer Protocol — HTTP/1.1 RFC 2616 = 14 Header Field Definitions – 14.10 Connection).

The 10054 would end up in the Windows Event Log for Applications like this:

The description for Event ID 0 from source MyFunctionality.exe cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

Socket Error # 10054
Connection reset by peer.

In the mean time, we shortened the result, so it does not fail any more.

Later I hope to find some time to do more research on this, for which I hope [WayBack] Health checking – HAProxy Technologies is a base.

–jeroen

Posted in Development, Software Development, Web Development | Leave a Comment »

28 Product Backlog and Refinement Anti-Patterns – Agile Transition

Posted by jpluimers on 2019/09/23

Food for thought: [WayBack] 28 Product Backlog and Refinement Anti-Patterns – Agile Transition

The most important one I learned: keep 20% slack and 20% technical debt+bugs (on a legacy system even more of the latter). This sounds like 40% waste, but is in effect a huge win as it makes the team much more flexible in responding to spikes, supporting team-mates (or cross functional teams) or having an off-day.

Via: [WayBack] 28 Product Backlog and Refinement Anti-Patterns – Agile Transition – Marjan Venema – Google+

–jeroen

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Posted in Agile, Development, Scrum, Software Development | Leave a Comment »

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