Ok changed the the lua implementation a little, still seeing 'different' images/colors appear when requesting the page repeatedly with a single browser though.. Assuming the 'penguinsimage' content doesnt change nor move in memory,, i suspect that somehow the txn.res:send is somehow subject to random buffer content overwriting..
    function myinit(txn)
        local f = io.open("/var/etc/haproxy/Penguins.jpg", "rb")
        penguinsimage = f:read("*all")
        f:close()
    end
core.register_init(myinit)
    function hello_world(txn)
        txn.res:send(penguinsimage)
        txn:close()
    end



Thierry FOURNIER schreef op 19-6-2015 om 14:22:
On Fri, 19 Jun 2015 02:05:50 +0200
PiBa-NL <piba.nl....@gmail.com> wrote:

Hi guys,

I'm sure i am abusing lua for completely wrong thing here.
But i do not understand why the result isn't at least consistent..

Ive got a Pinguïns.jpg of 759kB (Default Windows 7 example image)..
And have the configuration listed below.
When requesting the image from a browser the top of the image looks
normal, but further down it starts morphing, or becomes complete garbage..
Increasing bufsize to 300000 makes the image show normal when reading
and writing the whole image in 1 variable.. Though the buffer is still
less than half of the image size.?.

What im wondering though is how can it be that the results with smaller
bufsizes vary..?? Is it overflowing some memory? With 1.6dev1 it would
crash after a few requests, dev2 seems to have fixed that.. Though the
random behavior is still strange.. I would expect every time the same
image is send it to be cut short at buffsize, or perhaps just work if
lua might use its own memory buffers not limited to haproxy's buffsize?

Is it a bug? Or just a wrong lua script?
Should files / sockets be closed by the script? I get an error if i
do..(attempt to use a closed file)

Hi, thank you for the repport. I'm currently trying to reproduce it,
I'm not finished.

I see two errors in your code:

First, "io.*" are "real" blocking functions. HAProxy is really
blocked waiting for the data access. It is a very bad to use it.
However, how that you write for the file acces should work.

Second, your variable "f" is not declared as local. This variable is
keep between two requests. Maybe is the reason of your problem.

To serve static file with Lua, the best practice is loading the full
file during the initialisation and store it into a global variable.
During the runtime, you will use only the variable and not the file.

Thierry


global
#    tune.bufsize 300000
      tune.lua.session-timeout  100000
      tune.lua.task-timeout     100000
      lua-load /var/etc/haproxy/hello_world.lua
listen proxy
      bind :10001
      tcp-request content lua hello_image

function hello_image(txn)
      txn.res:send("HTTP/1.1 200 OK\n\n")
      f = io.open("/var/etc/haproxy/Penguins.jpg", "rb")
      local block = 5000
      while true do
          local bytes = f:read(block)
          if not bytes then break end
          txn.res:send(bytes)
          --core.msleep(25);   ## changes behavior to be somewhat more
succesfull..
      end
      txn:close()
      --f:close()   ## [ALERT] 168/232309 (74397) : Lua function
'hello_image': runtime error: /var/etc/haproxy/hello_world.lua:8:
attempt to use a closed file.
end

root@OPNsense:/usr/ports/net/haproxy-devel # haproxy -vv
HA-Proxy version 1.6-dev2-ad90f0d 2015/06/17
Copyright 2000-2015 Willy Tarreau <wi...@haproxy.org>

Build options :
    TARGET  = freebsd
    CPU     = generic
    CC      = cc
    CFLAGS  = -O2 -pipe -fstack-protector -fno-strict-aliasing
-DFREEBSD_PORTS
    OPTIONS = USE_GETADDRINFO=1 USE_ZLIB=1 USE_OPENSSL=1
USE_STATIC_PCRE=1 USE_PCRE_JIT=1

Default settings :
    maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200

Encrypted password support via crypt(3): yes
Built with zlib version : 1.2.8
Compression algorithms supported : identity("identity"),
deflate("deflate"), raw-deflate("deflate"), gzip("gzip")
Built with OpenSSL version : OpenSSL 1.0.2b 11 Jun 2015
Running on OpenSSL version : OpenSSL 1.0.2b 11 Jun 2015
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports prefer-server-ciphers : yes
Built with PCRE version : 8.35 2014-04-04
PCRE library supports JIT : yes
Built with Lua version : Lua 5.3.0
Built with transparent proxy support using: IP_BINDANY IPV6_BINDANY

Available polling systems :
       kqueue : pref=300,  test result OK
         poll : pref=200,  test result OK
       select : pref=150,  test result OK
Total: 3 (3 usable), will use kqueue.






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