Using SurrealDB from a server function seems to break compilation

[lukej57]

I'm trying to use SurrealDB from within a server function with leptos, but introducing any SurrealDB calls gives me a compilation error.

After running cargo add surrealdb, I've modified the AddTodo example from the leptos book as below.

use surrealdb::Surreal;
use surrealdb::engine::remote::ws::Ws;

...

#[server(AddTodo, "/api")]
pub async fn add_todo(title: String) -> Result<String, ServerFnError> {
  let db = Surreal::new::<Ws>("127.0.0.1:8000").await?;

  Ok(format!("Added {}", title))
}

#[component]
fn AddTodo() -> impl IntoView {
    let add_todo = create_server_action::<AddTodo>();
    // holds the latest *returned* value from the server
    let value = add_todo.value();
    // check if the server has returned an error
    let has_error = move || value.with(|val| matches!(val, Some(Err(_))));

    view! {
        <div>{value}</div>
        <ActionForm action=add_todo>
            <label>
                "Add a Todo"
                // `title` matches the `title` argument to `add_todo`
                <input type="text" name="title"/>
            </label>
            <input type="submit" value="Add"/>
        </ActionForm>
    }
}

cargo leptos watch now fails compiling ring.

  Compiling inout v0.1.3
   Compiling serde-wasm-bindgen v0.5.0
   Compiling itertools v0.11.0
   Compiling lock_api v0.4.11
   Compiling num-iter v0.1.43
   Compiling scopeguard v1.2.0
   Compiling crossbeam-utils v0.8.16
   Compiling server_fn v0.5.2
   Compiling leptos_reactive v0.5.2
   Compiling time-macros v0.2.15
   Compiling uuid v1.5.0
   Compiling cipher v0.4.4
   Compiling leptos_hot_reload v0.5.2
The following warnings were emitted during compilation:

warning: [email protected]: error: unable to create target: 'No available targets are compatible with triple "wasm32-unknown-unknown"'
warning: [email protected]: 1 error generated.

error: failed to run custom build command for `ring v0.17.5`

Caused by:
  process didn't exit successfully: `/Users/samurai/source/test/test/target/debug/build/ring-3b50ea3e7f79f27a/build-script-build` (exit status: 1)
  --- stdout
  cargo:rerun-if-env-changed=RING_PREGENERATE_ASM
  cargo:rustc-env=RING_CORE_PREFIX=ring_core_0_17_5_
  OPT_LEVEL = Some("0")
  TARGET = Some("wasm32-unknown-unknown")
  HOST = Some("aarch64-apple-darwin")
  cargo:rerun-if-env-changed=CC_wasm32-unknown-unknown
  CC_wasm32-unknown-unknown = None
  cargo:rerun-if-env-changed=CC_wasm32_unknown_unknown
  CC_wasm32_unknown_unknown = None
  cargo:rerun-if-env-changed=TARGET_CC
  TARGET_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")
  cargo:rerun-if-env-changed=CFLAGS_wasm32-unknown-unknown
  CFLAGS_wasm32-unknown-unknown = None
  cargo:rerun-if-env-changed=CFLAGS_wasm32_unknown_unknown
  CFLAGS_wasm32_unknown_unknown = None
  cargo:rerun-if-env-changed=TARGET_CFLAGS
  TARGET_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  running: "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "include" "-I" "/Users/samurai/source/test/test/target/wasm32-unknown-unknown/debug/build/ring-0bb192f673c26906/out" "-Wall" "-Wextra" "-fvisibility=hidden" "-std=c1x" "-pedantic" "-Wall" "-Wextra" "-Wbad-function-cast" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wenum-compare" "-Wfloat-equal" "-Wformat=2" "-Winline" "-Winvalid-pch" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wnested-externs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wstrict-prototypes" "-Wundef" "-Wuninitialized" "-Wwrite-strings" "-g3" "-nostdlibinc" "-DNDEBUG" "-DRING_CORE_NOSTDLIBINC=1" "-o" "/Users/samurai/source/test/test/target/wasm32-unknown-unknown/debug/build/ring-0bb192f673c26906/out/crypto/curve25519/curve25519.o" "-c" "crypto/curve25519/curve25519.c"
  cargo:warning=error: unable to create target: 'No available targets are compatible with triple "wasm32-unknown-unknown"'

  cargo:warning=1 error generated.

  exit status: 1

  --- stderr


  error occurred: Command "clang" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-unknown-unknown" "-I" "include" "-I" "/Users/samurai/source/test/test/target/wasm32-unknown-unknown/debug/build/ring-0bb192f673c26906/out" "-Wall" "-Wextra" "-fvisibility=hidden" "-std=c1x" "-pedantic" "-Wall" "-Wextra" "-Wbad-function-cast" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wenum-compare" "-Wfloat-equal" "-Wformat=2" "-Winline" "-Winvalid-pch" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wnested-externs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wstrict-prototypes" "-Wundef" "-Wuninitialized" "-Wwrite-strings" "-g3" "-nostdlibinc" "-DNDEBUG" "-DRING_CORE_NOSTDLIBINC=1" "-o" "/Users/samurai/source/test/test/target/wasm32-unknown-unknown/debug/build/ring-0bb192f673c26906/out/crypto/curve25519/curve25519.o" "-c" "crypto/curve25519/curve25519.c" with args "clang" did not execute successfully (status code exit status: 1).

I don't think it should be compiling ring for the browser at all, but I'm not sure how to debug this.

[tqwewe]

You need to add surrealdb as an optional dependency which is only used with the ssr feature flag.

surrealdb = { version = "*", optional = true }

[features]
ssr = [
  "dep:surrealdb"
]

[lukej57]

Thanks 🙏 This was it.

I also needed to make the imports conditional on the SSR feature.

use cfg_if::*;

cfg_if! {
  if #[cfg(feature = "ssr")] {
    use surrealdb::engine::remote::ws::Ws;
    use surrealdb::Surreal;
  }
}