mathiasandClaude Sonnet 5.5
cae423750c
Streams the WAV from disk with a computed Content-Length (no buffering, no chunking), posts verbose_json with field `file` and language=sv, clamps the final segment to the audio duration, and treats an empty transcript as a failure. The chain falls back on ANY primary error, records the serving endpoint, and never falls back once the context is cancelled. gateway.go and chain.go are one commit: the chain's tests use the gateway's StatusError and ErrEmptyTranscript, so neither compiles alone. Mutation-checked: field name, clamp, cancel-fallback, content length and the recorded endpoint each turn a test red. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
package transcribe
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import (
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"context"
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"errors"
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"fmt"
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"git.d-ma.be/mathias/tapir/internal/domain"
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)
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// Backend is one transcription endpoint. *Gateway satisfies it; Name is the value
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// recorded as the serving endpoint.
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type Backend interface {
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Name() string
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Transcribe(ctx context.Context, wavPath string) (domain.Transcription, error)
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}
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// Chain tries a primary (local) backend and, if it fails for ANY reason, a
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// fallback. The fallback exists because iguana can wedge permanently on a Metal
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// OOM (infra#273) — which is also why a fallback is a data-egress decision: the
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// berget endpoint is a cloud service, so the result records which one served it.
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type Chain struct {
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primary Backend
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fallback Backend // nil disables the fallback
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}
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// NewChain builds a Chain. A nil fallback means a primary failure is the result.
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func NewChain(primary, fallback Backend) *Chain {
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return &Chain{primary: primary, fallback: fallback}
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}
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// Transcribe returns the first backend's success. It falls back on any primary
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// error — transport, timeout, non-2xx, empty transcript — and never inspects a
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// response body to decide. A cancelled context stops the chain: a job the user or
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// shutdown cancelled must not ship its audio to a cloud endpoint as a last act.
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func (c *Chain) Transcribe(ctx context.Context, wavPath string) (domain.Transcription, error) {
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t, err := c.primary.Transcribe(ctx, wavPath)
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if err == nil {
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t.Endpoint = c.primary.Name()
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return t, nil
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}
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if c.fallback == nil || ctx.Err() != nil {
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return domain.Transcription{}, fmt.Errorf("%s: %w", c.primary.Name(), err)
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}
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t, ferr := c.fallback.Transcribe(ctx, wavPath)
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if ferr != nil {
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return domain.Transcription{}, errors.Join(
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fmt.Errorf("%s: %w", c.primary.Name(), err),
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fmt.Errorf("%s: %w", c.fallback.Name(), ferr))
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}
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t.Endpoint = c.fallback.Name()
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return t, nil
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}
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