Function libsql_malloc not found in Wasm module

[wkozaczuk]

I have been trying to play with libsql and WASM functions as described in this article while using the latest 0.2.1 release and the artifact libsql-0.2.1-wasm-udf.tar.gz from the release download page. Whenever I try to execute a SQL select statement (as described in the article) that calls the encrypt() function I get the following error:

libsql> CREATE TABLE secrets(secret_id, secret);
libsql> INSERT INTO secrets VALUES (1, encrypt('libSQL is great', 's3cr3tp4ss'));
Runtime error: Function libsql_malloc not found in Wasm module
libsql> ^D

The same worked fine in 0.1.0 release I believe.

I have also tried the wasmedge version - libsql-0.2.1-wasm-udf-wasmedge.tar.gz - but this tar is missing some libraries it depends on: libfmt.so.9 and libspdlog.so.1.11 which I managed to grab from the archives. However I get this error:

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:.libs:./usr/lib ./libsql 
./libsql: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by .libs/libwasmedge.so.0)
./libsql: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by ./usr/lib/libspdlog.so.1.11)
./libsql: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by ./usr/lib/libfmt.so.9)

I guess it relies on a different version of libstdc++.so.6 compared to what I have on my Fedora 35 host.

BTW I did manage to get the same WASM function example to run on OSv using version 0.1.0 after adding some minimal file-sealing support to OSv (see cloudius-systems/osv#1224). From my investigation, the wasmtime uses copy-on-write heap mappings which in turn relies on memfd_create which was missing from OSv. The copy-on-write heap mappings support can be turned off by compile option but maybe it makes sense to have it on for libsql. Having said all that I was eager to try to test the version of libsql with wasmedge.

[psarna]

Hi @wkozaczuk, great news on OSv! As for the libsql_malloc error, it's expected, our ABI changed between 0.1.0 and 0.2.0. Our https://bindgen.libsql.org/ tool is kept up-to-date with the newest release, so you can just use that to play with the encrypt function. Here it is for a quick copy-paste:

.init_wasm_func_table -- only needed for shell
DROP FUNCTION IF EXISTS encrypt;
CREATE FUNCTION encrypt LANGUAGE wasm AS X'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[wkozaczuk]

Thanks, it works now!

Is there a way to have WebAssembly files loaded from the filesystem? Something that would look like this:

CREATE FUNCTION encrypt LANGUAGE wasm AS FILE('/opt/data/encrypt.wasm');