Marshall Bowers
770886880f
This PR adds a new `extension` crate, containing some contents extracted from the `extension_host`. Right now it contains just the `ExtensionManifest` and `ExtensionBuilder`, although we may move more of the extension interface into here. The introduction of the `extension` crate allows us to depend on it in the `extension_cli`, thereby eliminating the need for the `no-webrtc` feature on a number of crates. Release Notes: - N/A
51 lines
1.7 KiB
Rust
51 lines
1.7 KiB
Rust
pub mod extension_builder;
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mod extension_manifest;
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use anyhow::{anyhow, bail, Context as _, Result};
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use semantic_version::SemanticVersion;
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pub use crate::extension_manifest::*;
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pub fn parse_wasm_extension_version(
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extension_id: &str,
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wasm_bytes: &[u8],
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) -> Result<SemanticVersion> {
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let mut version = None;
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for part in wasmparser::Parser::new(0).parse_all(wasm_bytes) {
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if let wasmparser::Payload::CustomSection(s) =
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part.context("error parsing wasm extension")?
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{
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if s.name() == "zed:api-version" {
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version = parse_wasm_extension_version_custom_section(s.data());
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if version.is_none() {
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bail!(
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"extension {} has invalid zed:api-version section: {:?}",
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extension_id,
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s.data()
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);
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}
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}
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}
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}
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// The reason we wait until we're done parsing all of the Wasm bytes to return the version
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// is to work around a panic that can happen inside of Wasmtime when the bytes are invalid.
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//
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// By parsing the entirety of the Wasm bytes before we return, we're able to detect this problem
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// earlier as an `Err` rather than as a panic.
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version.ok_or_else(|| anyhow!("extension {} has no zed:api-version section", extension_id))
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}
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fn parse_wasm_extension_version_custom_section(data: &[u8]) -> Option<SemanticVersion> {
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if data.len() == 6 {
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Some(SemanticVersion::new(
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u16::from_be_bytes([data[0], data[1]]) as _,
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u16::from_be_bytes([data[2], data[3]]) as _,
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u16::from_be_bytes([data[4], data[5]]) as _,
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))
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} else {
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None
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}
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}
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