cb59b77ed2
Two parallel atomars in the kei-buddy phase-1 plan. Mirror each other's
architecture: trait + feature-gated backend modules + env-driven dispatch
+ wiremock tests for HTTP backends + subprocess-error test for local.
## kei-tts (text-to-speech)
LOC: 959 across 15 files (largest src/lib.rs 121).
Trait `TtsBackend` + 4 backends behind feature flags:
* elevenlabs — POST api.elevenlabs.io/v1/text-to-speech/{voice}/stream
* openai — POST api.openai.com/v1/audio/speech (tts-1, tts-1-hd)
* google — POST texttospeech.googleapis.com/v1/text:synthesize
(Wavenet voices, base64 audioContent)
* piper — local subprocess to piper-tts binary, raw PCM out
Default features: ["piper"]. all-backends feature gates the rest.
`from_env()` reads KEI_TTS_BACKEND (default piper). Returns Box<dyn TtsBackend>.
Tests: 9 passed (env routing + 3 wiremock backends + piper subprocess error).
## kei-stt (speech-to-text)
LOC: 935 across 13 files (largest whisper_local.rs 181).
Trait `SttBackend` + 3 backends:
* whisper-local — subprocess to `whisper` CLI / faster-whisper,
reads JSON output, parses segments
* deepgram — POST api.deepgram.com/v1/listen (Token auth header,
raw audio body, parses words → Segments)
* openai-whisper — POST api.openai.com/v1/audio/transcriptions
(multipart file + model=whisper-1 +
response_format=verbose_json)
Default features: ["whisper-local"]. all-backends gates the rest.
`from_env()` reads KEI_STT_BACKEND (default whisper-local).
Tests: 10 passed + 1 doc-test (env routing + 5 wiremock + 2 JSON parsers
+ 1 subprocess error + 1 auth-header check).
## Common architecture decisions
* `with_base_url(url)` constructor on each HTTP backend for wiremock
testability — same pattern as kei-llm-router and kei-notify-telegram.
* `tempfile` crate added to kei-stt for whisper-local audio scratch.
* `base64 = { version = "0.22", optional = true }` in kei-tts for
Google's base64-encoded audioContent.
## Verify-before-commit (RULE 0.13 §)
* cargo check -p kei-tts (default + all-backends): PASS
* cargo check -p kei-stt (default + all-backends): PASS
* cargo test -p kei-tts --features all-backends --lib: 9/0
* cargo test -p kei-stt --features all-backends --lib: 10/0
* cargo check --workspace: PASS
STATUS-TRUTH from both agents: shipped=functional, stubs=0,
behaviour-verified=yes.
## Follow-up (deferred, non-blocking)
* Real backend verification needs API keys for ElevenLabs / OpenAI /
Google / Deepgram and piper-tts binary + .onnx model on PATH.
* whisper-local language_detected always None — whisper CLI JSON
schema differs across versions, parse heuristic to be added.
* faster-whisper has different JSON schema from openai-whisper;
current parser covers openai-whisper convention only.
39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
// SPDX-License-Identifier: Apache-2.0
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// Copyright 2026 <author org>
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//! `TtsError` — crate-level error enum for all TTS backends.
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//!
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//! Each variant carries a human-readable string so call-sites can log
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//! without leaking transport internals. `thiserror` provides `Display`
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//! and the `Error` trait automatically.
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use thiserror::Error;
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/// Errors that can occur across any TTS backend.
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#[derive(Debug, Error)]
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pub enum TtsError {
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/// HTTP transport or API error from a cloud backend.
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#[error("http: {0}")]
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Http(String),
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/// Subprocess (piper-tts) spawn or IO error.
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#[error("subprocess: {0}")]
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Subprocess(String),
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/// Required environment variable is absent.
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#[error("missing env var: {0}")]
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MissingEnv(String),
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/// Backend name was requested but its Cargo feature is not compiled in.
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#[error("backend not enabled: {0}")]
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BackendNotEnabled(String),
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/// Unexpected or malformed response from a backend.
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#[error("invalid response: {0}")]
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InvalidResponse(String),
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}
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impl From<reqwest::Error> for TtsError {
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fn from(e: reqwest::Error) -> Self {
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TtsError::Http(e.to_string())
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}
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}
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