Sails Rust Implementer

Sails Rust Implementer

Overview

Implement approved tasks in Sails-first Rust workspaces without freelancing new scope. If the task touches a released contract, preserve public routes, reply shapes, emitted events, and generated-client expectations unless the approved architecture explicitly changes them.

Inputs

• ../../references/sails-cheatsheet.md — core Sails patterns and APIs
• ../../references/sails-rs-imports.md — import paths for sails-rs types
• ../../references/delayed-message-pattern.md — delayed self-message recipe
• ../../references/vara-domain-overview.md — Vara domain context
• ../../references/gear-sails-production-patterns.md — production patterns
• ../../references/gear-messaging-and-replies.md — messaging and reply flows
• ../../references/gear-gas-reservations-and-waitlist.md — gas and waitlist
• ../../references/sails-syscall-mapping.md — Syscall::* API mapping (use instead of raw gcore::*/msg::*/exec::*)

Additional references by task type:

• Token work: ../../references/awesome-sails-token-patterns.md
• Released contract changes: ../../references/contract-interface-evolution.md

Consume the approved spec, architecture, and tasks artifacts before changing code.

If the target crate explicitly builds an ethexe path, stop and hand back to a dedicated ethexe workflow instead of extending this standard Sails pack.

Workflow

1. Confirm the task is already specified and architecture-approved.
2. Identify the smallest code change that satisfies the current task.
3. Match the current Sails release conventions before improvising: public service routes use #[export], events use emit_event, and shared types use #[sails_type] (expands to Encode + Decode + TypeInfo + ReflectHash with correct crate paths). Prefer #[sails_type] over manual derives for all service types, command/query params, and event payloads. Use #[sails_type(crate = my_crate)] when re-exporting from a different crate.
4. Preserve released routes, reply shapes, emitted events, IDL expectations, and client-facing contract stability unless the task explicitly changes them.
5. Keep failure handling aligned with Gear/Vara async semantics.
6. Hand local verification to the gtest loop before claiming the task is done.

Guardrails

• Do not redesign the feature while coding.
• Prefer Sails-level interfaces over raw payload work unless the task says otherwise.
• Keep constructor shape and state ownership consistent with the approved architecture instead of inventing a new storage pattern mid-implementation.
• Use generated clients or equivalent Sails Header-aware encoding for normal Sails calls; do not substitute bare raw structs for constructor or service payloads.
• If the feature needs a delayed self-message, use the shared payload recipe and the Syscall::message_source() == Syscall::program_id() guard pattern instead of ad hoc routing bytes.
• Preserve fail-fast command behavior; panic on fatal stateful command-path failures instead of introducing partial-commit recovery.
• Use Syscall::gas_available() for remaining-gas checks in execution paths.
• Use Syscall::* for all runtime accessors instead of raw gcore::*, msg::*, or exec::* calls. Full mapping: ../../references/sails-syscall-mapping.md (listed in Inputs).
• Treat value flow, replies, and async ordering as first-class behavior.
• Stop and hand back to planning if implementation uncovers a real architecture gap.
• Do not change a released public route shape in place unless the approved architecture explicitly allows it.
• Do not change a released event payload in place without explicit versioning or cutover guidance.
• Do not assume IDL regeneration alone makes a breaking interface change safe.
• Do not leave old-version write behavior undefined if the architecture requires ReadOnly or write-disable handling.

#[export] Usage

All public service methods must be annotated with #[export]. For standard (non-ethexe) Sails apps, no transport flags are needed — #[export] enables SCALE transport by default. Transport flags (scale, ethabi, payable) are ethexe-specific; see the sails-ethexe-implementer skill for details.