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feat: add multi-provider LLM failover with retry backoff (#28)

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* feat: add multi-provider LLM failover

Add FailoverProvider that wraps multiple LlmProvider instances and
tries each in sequence on transient failures. Non-retryable errors
(auth, context length, model not available) propagate immediately.

- New `FailoverProvider` with generic `try_providers` helper
- `is_retryable()` classifies transient errors (request failed,
  rate limited, invalid response, session renewal, HTTP, IO)
- Configurable via `NEARAI_FALLBACK_MODEL` env var
- Returns `Result` from constructor (no panics in production)
- Updates FEATURE_PARITY.md: failover chains ✅, cooldown ❌

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: track last-used provider for accurate cost/model reporting

After failover, model_name() and cost_per_token() now reflect the
provider that actually handled the request, not always the primary.
Also corrects is_retryable() docs to list ModelNotAvailable as retryable.

Addresses PR #28 review comments.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* feat: add retry with exponential backoff for LLM providers

Add retry logic with exponential backoff and jitter to both NearAiProvider
and NearAiChatProvider for transient errors (HTTP 429, 500, 502, 503, 504).

Extract shared retry helpers (is_retryable_status, retry_backoff_delay)
into src/llm/retry.rs so both providers reuse the same logic.

Configurable via NEARAI_MAX_RETRIES env var (default: 3).

* docs: clarify max_retries means N retries, not N total attempts

* warn when fallback model equals primary model

* fix: saturating_mul in backoff delay, dedupe to_lowercase allocation

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>
This commit is contained in:
alexthebuildr
2026-02-14 15:43:38 +04:00
committed by GitHub
co-authored by Claude Opus 4.6
parent d9ff86d7e0
commit 408ae8a29a
9 changed files with 840 additions and 109 deletions
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FEATURE_PARITY.md
+3 -3
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@@ -133,7 +133,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
|---------|----------|----------|-------|
| Pi agent runtime | ✅ | ➖ | IronClaw uses custom runtime |
| RPC-based execution | ✅ | ✅ | Orchestrator/worker pattern |
| Multi-provider failover | ✅ | ❌ | Provider fallback chains |
| Multi-provider failover | ✅ | ✅ | `FailoverProvider` tries providers sequentially on retryable errors |
| Per-sender sessions | ✅ | ✅ | |
| Global sessions | ✅ | ❌ | Optional shared context |
| Session pruning | ✅ | ❌ | Auto cleanup old sessions |
@@ -173,7 +173,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
| Feature | OpenClaw | IronClaw | Notes |
|---------|----------|----------|-------|
| Auto-discovery | ✅ | ❌ | |
| Failover chains | ✅ | ❌ | Provider fallback |
| Failover chains | ✅ | ✅ | `FailoverProvider` with configurable `fallback_model` |
| Cooldown management | ✅ | ❌ | Skip failed providers |
| Per-session model override | ✅ | ✅ | Model selector in TUI |
| Model selection UI | ✅ | ✅ | TUI keyboard shortcut |
@@ -419,7 +419,7 @@ This document tracks feature parity between IronClaw (Rust implementation) and O
- ❌ Slack channel (real implementation)
- ✅ Telegram channel (WASM, DM pairing, caption, /start)
- ❌ WhatsApp channel
- ❌ Multi-provider failover
- ✅ Multi-provider failover (`FailoverProvider` with retryable error classification)
- ❌ Hooks system (beforeInbound, beforeToolCall, etc.)
### P2 - Medium Priority