44 lines
1.2 KiB
Markdown
44 lines
1.2 KiB
Markdown
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# Extension routing
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Version 0.1 — SAND-WP-0006. Select backend when a profile lists multiple extensions.
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## Profile route block
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```yaml
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extension: ext.compose-ssh # default / explicit fallback
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route:
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strategy: prefer-self-hosted
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extensions:
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- ext.compose-ssh
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- ext.saas-stub
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max_cost_per_hour_usd: 1.0
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```
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## Strategies
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| Strategy | Behavior |
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|----------|----------|
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| `explicit` | Use `profile.extension` (default when no route) |
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| `prefer-self-hosted` | First self-hosted candidate with resolvable host; else SaaS |
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| `lowest-cost` | Self-hosted if available; else cheapest `estimate_cost` |
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| `lowest-latency` | Self-hosted if available; else last candidate (v0) |
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## Testing SaaS fallback
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```bash
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# Skip self-hosted when host unavailable:
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unset SANDBOXER_HOST
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SANDBOXER_FORCE_SAAS=1 sandboxer create --profile profile.burst-sandbox
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# Or use metered-only profile:
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sandboxer create --profile profile.saas-stub
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```
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## Reference profiles
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| Profile | Route |
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|---------|-------|
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| `profile.burst-sandbox` | compose-ssh → saas-stub fallback |
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| `profile.saas-stub` | explicit `ext.saas-stub` |
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Resolver: `sandboxer.routing.resolver.resolve_extension`.
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