mod_wasm
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vmware-labs
Windows PHP CGI Execution Error
Describe the bug
First of all, thank you for this awesome project!
I followed the Installation steps for Windows, downloaded the examples and tried my best to get the php examples running but I get the following error message using this location:
<Location /php-hello>
AddHandler wasm-handler .php
WasmModule D:/wasmer/php-cgi-8.2.0.wasm
WasmDir /tmp
WasmEnv TMPDIR /tmp
WasmMapDir / /
WasmEnableCGI On
</Location>
Message:
[Sat Sep 30 19:05:32.778156 2023] [mpm_winnt:notice] [pid 34536:tid 336] AH00354: Child: Starting 64 worker threads.
ERROR! C-API: Can't run Wasm execution context 'E8A405B1'! "ERROR! Invocation of function '_start' failed! Wasm Trap returned! error while executing at wasm backtrace:\n 0: 0x8f8afe - <unknown>!<wasm function 11722>\n 1: 0xbadd - <unknown>!<wasm function 38>\n\nCaused by:\n exit with invalid exit status outside of [0..126)"
[Sat Sep 30 19:05:37.331759 2023] [wasm:error] [pid 34536:tid 1020] (-1)Unknown error: [client ::1:54591] content_handler() - ERROR! Couldn't run Wasm execution context 'E8A405B1'!
[Sat Sep 30 19:05:37.331759 2023] [core:error] [pid 34536:tid 1020] [client ::1:54591] End of script output before headers: index.php
[Sat Sep 30 19:05:37.331759 2023] [wasm:error] [pid 34536:tid 1020] (500)Unknown error: [client ::1:54591] ERROR! Invalid script response. On header #0, found character '(null)':
[Sat Sep 30 19:05:37.331759 2023] [wasm:error] [pid 34536:tid 1020] (500)Unknown error: [client ::1:54591] ERROR! Couldn't find mandatory 'Content-type' HTTP header (i.e.: "Content-type: text/html\n\n")
I manged to see a result using this Location with WasmEnableCGI = Off
<Location /php-hello2>
AddHandler wasm-handler .php
WasmModule D:/wasmer/php-cgi-8.2.0.wasm
WasmArg /index.php
WasmMapDir / D:/webassambly/htdocs/php-hello2
WasmEnableCGI Off
</Location>
Result (truncated):
X-Powered-By: PHP/8.2.0
Content-type: text/html; charset=UTF-8
<html>
<body>
<h1>Hello from PHP on Wasm!</h1>
Today, Saturday, 2023-9-30, at 21:30:39 we greet you with this message!<h1>Output from phpinfo():</h1>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
body {
background-color: #fff;
color: #222;
font-family: sans-serif;
}
...
The non php exapmles like http-request-viewer run just fine.
I don't know, if this is a bug or a wrong configuration.
Reproduction steps
- Download apache httpd version 2.4.57 for Windows
- Download the mod_wasm for Windows from the apachelounge website in version 0.12.1
- use the provided httpd.conf from this project
- Edit the config to match your local filesystem
- Start apache httpd.exe
- Browse the php-hello website
Expected behavior
The Hello from PHP on Wasm! message and the phpinfo() html is shown
Additional context
I also tried wasmer using this wasmer.toml:
[package]
name = "wasmer/php-hello"
version = "0.0.1"
description = "A PHP template for WCGI applications"
license = "MIT OR Apache-2.0"
readme = "README.md"
repository = "https://github.com/wasmerio/wcgi-php-template"
[[module]]
name = "php"
source = "php-cgi-8.2.0.wasm"
abi = "wasi"
[[command]]
name = "php"
runner = "wcgi"
module = "php"
[command.annotations.wcgi]
dialect = "rfc-3875"
[command.annotations.wasi]
atom = "php"
env = ["DOCUMENT_ROOT=/app", "SCRIPT_FILENAME=/app/index.php"]
[fs]
"app" = "app"
Running wasmer with this command
wasmer run-unstable .
returns the expected result. So php-cgi-8.2.0.wasm is fine but I don't have any idea what causes the issue.
Thank you for your report @reeperbahnause! We are very glad that you like mod_wasm!
The fact that setting WasmEnableCGI to Off makes it work is interesting.
We have to look more in depth into this, we'll take a look at it as soon as possible, hopefully next week.
