On Fri, 19 Jun 2015 02:05:50 +0200
PiBa-NL <[email protected]> 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 <[email protected]>
>
> 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.
>
>
>
--
Thierry FOURNIER <[email protected]>
