Crate camel_language_js 

JavaScript language plugin for Apache Camel Rust.

Provides JsLanguage — a Language implementation backed by the Boa JavaScript engine.

Resource Limits

Scripts are bounded by configurable limits sourced from [languages.js.limits] in Camel.toml. When absent, rust-camel runtime defaults apply:

Limit	Default	Source
execution-timeout-ms	5,000	tokio::time::timeout + spawn_blocking
max-loop-iterations	100,000	Boa RuntimeLimits::set_loop_iteration_limit
max-recursion-depth	512	Boa RuntimeLimits::set_recursion_limit
max-stack-size	10,240 slots	Boa RuntimeLimits::set_stack_size_limit

Covered threats

• Infinite loops (while (true) {}) — trip max-loop-iterations.
• Deep recursion — trips max-recursion-depth.
• Stack exhaustion — trips max-stack-size.
• Wall-clock stalls — bounded by execution-timeout-ms.

NOT covered

Heap cap — boa_engine 0.21 does not expose a heap-size limit. A script that allocates many small objects can exhaust process memory before any other limit trips. Route authors writing JS that allocates heavily should validate their scripts carefully; untrusted JS should use function: (ADR-0005, out-of-process) instead of js:/javascript:.

Timeout caveat

Same as Rhai: when execution-timeout-ms fires, the route future resolves to an error, but the blocking thread may continue executing until a RuntimeLimits bound trips or the script finishes.

Re-exports

pub use engines::BoaEngine;

pub use error::JsLanguageError;

Modules

engines

error

value

Conversions between serde_json::Value and boa_engine::JsValue.

Structs

JsEvalResult

The result of evaluating a JS expression.

JsExchange

A snapshot of exchange state passed into and out of JS evaluation.

JsLanguage

JavaScript language plugin backed by Boa.

Traits

JsEngine

Abstraction over a JavaScript engine capable of evaluating expressions against a JsExchange context.