compiling facil to shared library to be called from julia

[AbhimanyuAryan]

How can I compile facil into a shared library to use various functionality in Julia code? Something like this: https://github.com/AbhimanyuAryan/ccallex

I am not familiar with how makefiles work so that causes a lot of trouble in understanding

technically, what I want to achieve is calling various facil functionality like starting a server, serving requests from julia ccall

result = ccall((:add, "libexample.so"), Int32, (Int32, Int32), 2, 3)
println(result)  # This should print 5

[AbhimanyuAryan]

I followed up on this tutorial: https://morioh.com/p/c07e68e7377b

but it generates a Unix executable but I can't use that Julia. What I need is a .so file

./fioapp
INFO: Listening on port 3000
INFO: Server is running 7 workers X 8 threads with facil.io 0.7.6 (kqueue)
* Detected capacity: 131056 open file limit
* Root pid: 50763
* Press ^C to stop

INFO: 50765 is running.
INFO: 50764 is running.
INFO: 50767 is running.
INFO: 50766 is running.
INFO: 50769 is running.
INFO: 50768 is running.
INFO: 50770 is running.

[AbhimanyuAryan]

ok, so I used this command to create .so file. make command generated .o files for lib so I thought I could generate .so using .o

gcc -shared -o libfacil.so \
facil/fio.o \
facil/cli/fio_cli.o \
facil/fiobj/fio_siphash.o \
facil/fiobj/fiobj_ary.o \
facil/fiobj/fiobj_data.o \
facil/fiobj/fiobj_hash.o \
facil/fiobj/fiobj_json.o \
facil/fiobj/fiobj_mustache.o \
facil/fiobj/fiobj_numbers.o \
facil/fiobj/fiobj_str.o \
facil/fiobj/fiobject.o \
facil/http/http.o \
facil/http/http1.o \
facil/http/http_internal.o \
facil/http/websockets.o \
facil/redis/redis_engine.o \
facil/tls/fio_tls_missing.o \
facil/tls/fio_tls_openssl.o

but looks like there are no exported symbols

$ nm -D libfacil.so
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/nm: error: libfacil.so: File format has no dynamic symbol table

because my julia program can't use functions from libfacil.so

# Define the options structure according to facil.io documentation
mutable struct HttpOptions
    on_request::Ptr{Cvoid}
    log::Cint
end

# Define the on_request callback function
function on_request(request::Ptr{Cvoid})
    # You may need to write more code here to handle the request
    ccall((:http_write, "libfacil.so"), Cint, (Ptr{Cvoid}, Cstring, Csize_t), request, "HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello World!\r\n", 44)
end

# Get a pointer to the on_request function
on_request_ptr = @cfunction(on_request, Cvoid, (Ptr{Cvoid},))

# Define the http_listen function
function http_listen(port::String, binding::String, options::Ref{HttpOptions})
    ccall((:http_listen, "libfacil.so"), Cint, (Cstring, Cstring, Ref{HttpOptions}), port, binding, options)
end

# Define the facil_run function
function facil_run(threads::Cint)
    ccall((:facil_run, "libfacil.so"), Cvoid, (Cint,), threads)
end

# Now call the functions
options = HttpOptions(on_request_ptr, 1)
http_listen("3000", "", Ref(options))
facil_run(Cint(1))

[AbhimanyuAryan]

How can I compile facil into a shared library to use various functionality in Julia code? Something like this: https://github.com/AbhimanyuAryan/ccallex

I am not familiar with how makefiles work so that causes a lot of trouble in understanding

technically, what I want to achieve is calling various facil functionality like starting a server, serving requests from julia ccall

result = ccall((:add, "libexample.so"), Int32, (Int32, Int32), 2, 3)
println(result)  # This should print 5

for this simple example. I can see the _add symbol is exported properly in .so

nm libexample.so
0000000000003f98 T _add

so it's definitely an issue with generating .so file for facil library

[AbhimanyuAryan]

ok no so the -D flag was stripping the exports. Now I can see with nm libfacil.so

nm libfacil.so
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[AbhimanyuAryan]

there's definitely something wrong with my julia program. I'll look into it

[boazsegev]

Hi @AbhimanyuAryan ,

TL;DR; : the default makefile should have a lib rule, so make lib should produce a shared library.

Thank you for your interest in facil.io and in porting it as a shared library to Julia.

I do not work with Julia, but I assume this could be a great project :)

FYI, the default makefile should have a lib rule, so make lib should produce a shared library.

At the moment I'm working on the facil.io 0.8.x version (the API is still somewhat fluid, but we're getting there). You can see the core C STL and modular library at: https://github.com/facil-io/cstl

The only integration issue I can see is that many functions are really short-hand helpers and they are actually static and inline functions that might not appear in the shared library code (as they are part of the C header)... such functionality might need to be ported manually to Julia or another C file could be added to make sure the functions are emitted.

I'll think about ways to solve this for version 0.8.x so integrating facil.io into other languages is made easier.

I hope this helps.

Good Luck!

[boazsegev]

FYI:

I just noticed that the Julia language documentation mentions a GitHub project for automatically creating Julia functions from C and C++ header files.

Feel free to comment here with any further suggestions / comments.

[AbhimanyuAryan]

Hi @boazsegev I look at Clang.jl and it just automates the creation of binding but before that I want to make sure everything works as expected.

So, I tried the traditional approach and it worked as expected

julia> const libfacil = "./libfacil.so"
"./libfacil.so"

julia> ccall((:fio_start, libfacil), Cvoid, (Cint,), 1)
INFO: Server is running 1 worker X 1 thread with facil.io 0.7.6 (kqueue)
* Detected capacity: 131056 open file limit
* Root pid: 61044
* Press ^C to stop

but when I moved a step further with using http_listen. I got Segmentation fault error

code

# First, define the path to the shared library
const libfacil = "./libfacil.so"

# # Then, define the C function signature in Julia
# # For example, to call the `fio_start` function:
ccall((:fio_start, libfacil), Cvoid, (Cint,), 1)

function on_request(request::Ptr{Cvoid})
    ccall((:http_send_body, libfacil), Cvoid, (Ptr{Cvoid}, Cstring, Csize_t), request, "Hello World!\r\n", 14)
end

# Convert the Julia function to a C function pointer
const on_request_c = @cfunction(on_request, Cvoid, (Ptr{Cvoid},))

# Start listening on the specified port
ccall((:http_listen, libfacil), Cint, (Cstring, Ptr{Cvoid}, Ptr{Cvoid}, Cint), "3000", C_NULL, on_request_c, 1)

# Start the server
ccall((:fio_start, libfacil), Cvoid, (Cint,), 1)

error:

julia http.jl

[60734] signal (11.2): Segmentation fault: 11
in expression starting at /Users/abhi/Git/CJulia/facil/tmp/http.jl:17
_platform_strlen at /usr/lib/system/libsystem_platform.dylib (unknown line)
Allocations: 2996 (Pool: 2985; Big: 11); GC: 0
[1]    60733 segmentation fault  julia http.jl

[AbhimanyuAryan]

I also checked the if the library is loaded correctly or not and it seems ok too

julia> using Libdl

julia> dlopen("./libfacil.so")
Ptr{Nothing} @0x000000009a6e6190

julia> lib = dlopen("./libfacil.so")
Ptr{Nothing} @0x000000009a6e6190

julia> if lib == C_NULL
           error("Failed to load libfacil.so shared library")
       end

[boazsegev]

The http_listen function expects a struct, not a list of parameters... this might change the way the function call is made (depending on the system's conventions for function calls), not to mention that some systems might have different struct packing...

Maybe this is related to the error? Maybe (I am not sure), if a Julia C struct was used to bridge the parameters it would work...?

[AbhimanyuAryan]

yes that is the error. I need to pass a Julia struct that converts to c struct

https://docs.julialang.org/en/v1/manual/calling-c-and-fortran-code/#Struct-Type-Correspondences

[AbhimanyuAryan]

ok looks like I made some progress

# First, define the path to the shared library
const httplib = "./libfacil.so"

struct http_settings_s
    on_request::Ptr{Cvoid}
    log::Cint
    # Add other fields as needed
end

function on_request(request::Ptr{Cvoid})
    ccall((:http_send_body, httplib), Cvoid, (Ptr{Cvoid}, Cstring, Csize_t), request, "Hello World!\r\n", 14)
end

# Convert the Julia function to a C function pointer
const on_request_c = @cfunction(on_request, Cvoid, (Ptr{Cvoid},))

# Define the C struct
const settings = http_settings_s(on_request_c, 1)

println("before listen")

# Start listening on the specified port
ccall((:http_listen, httplib), Cintmax_t, (Cstring, Cstring, Ref{http_settings_s}), "3000", C_NULL, settings)

println("after listen")

# Start the server
ccall((:fio_start, httplib), Cvoid, (Cint,), 1)

println("after start")

but now it doesn't go on the next line fio_start. Looks like http_listen is blocking

julia http.jl
before listen
FATAL: No supported SSL/TLS library available.

[AbhimanyuAryan]

ok, @boazsegev ignore previous messages. Stupid me I had to just use @async in front of http_listen as it was a blocking process. Now it works fine in Julia ❤️💚💜

[AbhimanyuAryan]

the final julia code looks like this

# First, define the path to the shared library
const httplib = "./libfacil.so"

struct http_settings_s
    on_request::Ptr{Cvoid}
    log::Cint
    # Add other fields as needed
end

function on_request(request::Ptr{Cvoid})
    ccall((:http_send_body, httplib), Cvoid, (Ptr{Cvoid}, Cstring, Csize_t), request, "Hello World!\r\n", 14)
end

# Convert the Julia function to a C function pointer
const on_request_c = @cfunction(on_request, Cvoid, (Ptr{Cvoid},))

# Define the C struct
const settings = http_settings_s(on_request_c, 1)

println("before listen")

# Start listening on the specified port
@async ccall((:http_listen, httplib), Cintmax_t, (Cstring, Cstring, Ref{http_settings_s}), "3000", C_NULL, settings)

println("after listen")

# Start the server
ccall((:fio_start, httplib), Cvoid, (Cint,), 1)

println("after start")

[AbhimanyuAryan]

I will make a few more examples with ccall and then use Clang.jl and BinaryBuilder.jl to create a wrapper. Quite complex need to understand how they work but not impossible. It will take a lot of time but the output will be excellent. A fast HTTP, WebSocket lib for Julia 🎉

[AbhimanyuAryan]

some quick benchmarking

NodeJS 272k requests with autocannon vs CCall facil 1107k requests