go-sqlite3 VS wasi-libc

Yep, I just made it tweakable at build, which was always the intent, although I expect the default to be popular.

https://github.com/ncruces/go-sqlite3/blob/67d859a5/vfs/adia...

That's unfortunate about the default parameters, but note that you can also replace the KDF altogether (besides just not using it).

You just need to implement this interface, with any HBSH construction and KDF:

https://github.com/ncruces/go-sqlite3/blob/67d859a5/vfs/adia...

If you keep the HBSH and change the KDF, your file format will be “compatible.”

struggling figuring out how to make my cgo sqlite cross-compile to Windows

Plenty of people trying to fix that.

There's at least:

https://modernc.org/sqlite

Then there's https://github.com/zombiezen/go-sqlite that actually builds https://crawshaw.io/sqlite on top of modernc.

And there's mine that has both a low level and a database/sql driver builds and runs everywhere Go does: https://github.com/ncruces/go-sqlite3

If you're interested both SQLite's and my memdb VFSes implement safe locking.

Depending on your familiarity with Go, mine maybe easier to follow, or not.

https://github.com/ncruces/go-sqlite3/blob/f1b00a9944730eaa9...

One thing I tried to make sure, to avoid the pitfall modernc is having, is to make sure building "the WASM BLOB" is easily reproducible with widely available tools:

https://github.com/ncruces/go-sqlite3/blob/main/.github/work...

I do apply some light patches to SQLite, but so far they've always cleanly applied, and I can produce a new release within hours of being notified of SQLite releases.

Disclosure: I'm working on alternative Cgo-less bindings for SQLite, using wazero.

https://github.com/ncruces/go-sqlite3

One of the problems of the modernc approach (IMO) is that they're not just transpiring CPU/compute stuff, but entirely OS/platform stuff.

Each Go file of theirs is a xxx_os_arch.go that starts with 100s of OS-#defines-as-consts, and goes on to transpile fully #ifdefed code.

It also implements antithetical (in Go) stuff like goroutine local storage, because libc pthreads can't live without it.

And all IO is via direct syscalls that will never play nice with the Go scheduler, because, again this is OS level stuff.

WASM defines a cross platform CPU and an ABI, and using that for compute and the bottom OS layer in Go you get (IMO) a nicer end result.

Given the hard task of generating decent code from WASM at load time (wazero's compiler is pretty naive, a better one is being developed, but it will take seconds to generate good code for anything non trivial like SQLite) I wouldn't mind having a solution that translated to Go, or Go ASM, at build time.

The github.com/ncruces/go-sqlite3 is a link.

Using the stack pointer global is an interesting hack. I'd never thought of that. Need to compare with what I'm doing for SQLite (a kind of per connection arena).

Now there are projects like WASI that allows for interfacing with system resources for WASM code this allows for devs to target WASM runtime for their apps sliding the apps to run locally on any OS without any porting required. This could be a game changer in the future like Docker and containers was in the past decade.

So it doesn’t seem like there has been progress on a pseudo-random number generator function for typst, but there are multiple other ways to solve this: 1. Just don’t. Typst has this functional philosophy, there one input always produces the same output. (not an answer to your question tho) 2. Interface with a webassembly module which has a random number generator. So you could e.g. compile c to wasm and statically link a libc version. You would then just have to export the rand() function. (You could use any lang for this, which has a stdlib with a pseudo random number generator) 3. Implement your own. Random number generators are actually not that hard something like an LCG isn’t to complex. (Id provide an example but im on my phone rn)

Actually WASI[0] will be a better alternative, IIRC extism serialize and deserialize the data that you want to pass every time, adding a lot of overhead.

[0] https://wasi.dev

Actually, it was in wasi-libc: https://github.com/WebAssembly/wasi-libc/blob/main/libc-bott...

Proper isolation in C# is only now becoming a thing, with .Net support for WASI, which is essentially a WebAssembly sandbox which can be given extremely granular privileges (such as access to spefic file system directories, or an effective virtual file system). As an upside, the idea is that it should be possible to write the WASI packages in more or less anything.

Wasm Labs dev here :)

In mod_wasm, there are some differences with a pure CGI implementation. When Apache boots, it loads the configuration and initializes the WasmVM. When a new HTTP request arrives, the VM is ready so you don't need to initialize a different process to manage it.

You still need to process the request and pass the data to the Wasm module. This step is done via STDIN through the WebAssembly System Interface (WASI) implementation [0]. The same happens in the opposite direction, as the module returns the data via STDOUT.

So, the CGI pattern is still there, but it doesn't require new processes and all the code runs in a sandbox.

However this is not the only way you can run a Wasm module. In this specific case, we use CGI via WASI. In other cases, you may compile a module to fulfill a specific API, like ProxyWasm [1] to create HTTP filters for proxies like Envoy.

- [0] https://wasi.dev/

- [1] https://github.com/proxy-wasm/spec

Never done that, but I think you need this: https://wasi.dev/

The Python builds from the WebAssembly language runtimes [0] project target the WebAssembly System Interfaces (WASI) [1]. It allows the Python interpreter to interact with resources like the filesystem.

Many server-side Wasm runtimes supports WASI out of the box. For the browser, you need to provide a polyfill to emulate these resources like the one provided by the WASI team [2].

Regarding SQLite, these builds include libsqlite so you should be able to use it :)

- [0] https://github.com/vmware-labs/webassembly-language-runtimes

- [1] https://wasi.dev/

- [2] https://wasi.dev/polyfill/

Effective debugging results in effective programming; itk-wasm makes effective debugging of WebAssembly possible. In this tutorial, adapted from the itk-wasm documentation, we walk through how to debug a C++ data processing pipeline with the mature, native binary debugging tools that are comfortable for developers. This is a fully featured way to ensure the base correctness of a processing pipeline. Next, we will walk through an interactive debugging experience for WASI WebAssembly. With itk-wasm, we can debug the same source code in either context with an interactive debugger. We also have a convenvient way to pass data from our local filesystem into a WebAssembly (Wasm) processing pipeline.

Communication between the WASM module and the rest of the application needs to be done in very simple types (bytes, ints and floats). No complex types are supported yet. This is why most WASM compilers also provide some glue-code to map between complex types like strings or arrays. The Web Assembly System Interface (WAS) is an on-progress standard aimed to solve this last limitation; once it's mature it will allow easy interoperation with almost every environment. WASI is already available in some WSAM compilers and runtimes.