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| 1 | +import type { ClawdbotConfig } from "../config/config.js"; |
| 2 | +import { DEFAULT_MODEL, DEFAULT_PROVIDER } from "./defaults.js"; |
| 3 | +import { |
| 4 | + buildModelAliasIndex, |
| 5 | + modelKey, |
| 6 | + parseModelRef, |
| 7 | + resolveModelRefFromString, |
| 8 | +} from "./model-selection.js"; |
| 9 | + |
| 10 | +type ModelCandidate = { |
| 11 | + provider: string; |
| 12 | + model: string; |
| 13 | +}; |
| 14 | + |
| 15 | +type FallbackAttempt = { |
| 16 | + provider: string; |
| 17 | + model: string; |
| 18 | + error: string; |
| 19 | +}; |
| 20 | + |
| 21 | +function isAbortError(err: unknown): boolean { |
| 22 | + if (!err || typeof err !== "object") return false; |
| 23 | + const name = "name" in err ? String(err.name) : ""; |
| 24 | + if (name === "AbortError") return true; |
| 25 | + const message = |
| 26 | + "message" in err && typeof err.message === "string" |
| 27 | + ? err.message.toLowerCase() |
| 28 | + : ""; |
| 29 | + return message.includes("aborted"); |
| 30 | +} |
| 31 | + |
| 32 | +function buildAllowedModelKeys( |
| 33 | + cfg: ClawdbotConfig | undefined, |
| 34 | + defaultProvider: string, |
| 35 | +): Set<string> | null { |
| 36 | + const rawAllowlist = cfg?.agent?.allowedModels ?? []; |
| 37 | + if (rawAllowlist.length === 0) return null; |
| 38 | + const keys = new Set<string>(); |
| 39 | + for (const raw of rawAllowlist) { |
| 40 | + const parsed = parseModelRef(String(raw ?? ""), defaultProvider); |
| 41 | + if (!parsed) continue; |
| 42 | + keys.add(modelKey(parsed.provider, parsed.model)); |
| 43 | + } |
| 44 | + return keys.size > 0 ? keys : null; |
| 45 | +} |
| 46 | + |
| 47 | +function resolveFallbackCandidates(params: { |
| 48 | + cfg: ClawdbotConfig | undefined; |
| 49 | + provider: string; |
| 50 | + model: string; |
| 51 | +}): ModelCandidate[] { |
| 52 | + const provider = params.provider.trim() || DEFAULT_PROVIDER; |
| 53 | + const model = params.model.trim() || DEFAULT_MODEL; |
| 54 | + const aliasIndex = buildModelAliasIndex({ |
| 55 | + cfg: params.cfg ?? {}, |
| 56 | + defaultProvider: DEFAULT_PROVIDER, |
| 57 | + }); |
| 58 | + const allowlist = buildAllowedModelKeys(params.cfg, DEFAULT_PROVIDER); |
| 59 | + const seen = new Set<string>(); |
| 60 | + const candidates: ModelCandidate[] = []; |
| 61 | + |
| 62 | + const addCandidate = (candidate: ModelCandidate, enforceAllowlist: boolean) => { |
| 63 | + if (!candidate.provider || !candidate.model) return; |
| 64 | + const key = modelKey(candidate.provider, candidate.model); |
| 65 | + if (seen.has(key)) return; |
| 66 | + if (enforceAllowlist && allowlist && !allowlist.has(key)) return; |
| 67 | + seen.add(key); |
| 68 | + candidates.push(candidate); |
| 69 | + }; |
| 70 | + |
| 71 | + addCandidate({ provider, model }, false); |
| 72 | + |
| 73 | + for (const raw of params.cfg?.agent?.modelFallbacks ?? []) { |
| 74 | + const resolved = resolveModelRefFromString({ |
| 75 | + raw: String(raw ?? ""), |
| 76 | + defaultProvider: DEFAULT_PROVIDER, |
| 77 | + aliasIndex, |
| 78 | + }); |
| 79 | + if (!resolved) continue; |
| 80 | + addCandidate(resolved.ref, true); |
| 81 | + } |
| 82 | + |
| 83 | + return candidates; |
| 84 | +} |
| 85 | + |
| 86 | +export async function runWithModelFallback<T>(params: { |
| 87 | + cfg: ClawdbotConfig | undefined; |
| 88 | + provider: string; |
| 89 | + model: string; |
| 90 | + run: (provider: string, model: string) => Promise<T>; |
| 91 | + onError?: (attempt: { |
| 92 | + provider: string; |
| 93 | + model: string; |
| 94 | + error: unknown; |
| 95 | + attempt: number; |
| 96 | + total: number; |
| 97 | + }) => void | Promise<void>; |
| 98 | +}): Promise<{ |
| 99 | + result: T; |
| 100 | + provider: string; |
| 101 | + model: string; |
| 102 | + attempts: FallbackAttempt[]; |
| 103 | +}> { |
| 104 | + const candidates = resolveFallbackCandidates(params); |
| 105 | + const attempts: FallbackAttempt[] = []; |
| 106 | + let lastError: unknown; |
| 107 | + |
| 108 | + for (let i = 0; i < candidates.length; i += 1) { |
| 109 | + const candidate = candidates[i] as ModelCandidate; |
| 110 | + try { |
| 111 | + const result = await params.run(candidate.provider, candidate.model); |
| 112 | + return { |
| 113 | + result, |
| 114 | + provider: candidate.provider, |
| 115 | + model: candidate.model, |
| 116 | + attempts, |
| 117 | + }; |
| 118 | + } catch (err) { |
| 119 | + if (isAbortError(err)) throw err; |
| 120 | + lastError = err; |
| 121 | + attempts.push({ |
| 122 | + provider: candidate.provider, |
| 123 | + model: candidate.model, |
| 124 | + error: err instanceof Error ? err.message : String(err), |
| 125 | + }); |
| 126 | + await params.onError?.({ |
| 127 | + provider: candidate.provider, |
| 128 | + model: candidate.model, |
| 129 | + error: err, |
| 130 | + attempt: i + 1, |
| 131 | + total: candidates.length, |
| 132 | + }); |
| 133 | + } |
| 134 | + } |
| 135 | + |
| 136 | + if (attempts.length <= 1 && lastError) throw lastError; |
| 137 | + const summary = |
| 138 | + attempts.length > 0 |
| 139 | + ? attempts |
| 140 | + .map( |
| 141 | + (attempt) => |
| 142 | + `${attempt.provider}/${attempt.model}: ${attempt.error}`, |
| 143 | + ) |
| 144 | + .join(" | ") |
| 145 | + : "unknown"; |
| 146 | + throw new Error( |
| 147 | + `All models failed (${attempts.length || candidates.length}): ${summary}`, |
| 148 | + { cause: lastError instanceof Error ? lastError : undefined }, |
| 149 | + ); |
| 150 | +} |
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