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<a name='L207'></a><a href='#L207'>207</a>
<a name='L208'></a><a href='#L208'>208</a>
<a name='L209'></a><a href='#L209'>209</a>
<a name='L210'></a><a href='#L210'>210</a>
<a name='L211'></a><a href='#L211'>211</a>
<a name='L212'></a><a href='#L212'>212</a>
<a name='L213'></a><a href='#L213'>213</a>
<a name='L214'></a><a href='#L214'>214</a>
<a name='L215'></a><a href='#L215'>215</a>
<a name='L216'></a><a href='#L216'>216</a>
<a name='L217'></a><a href='#L217'>217</a>
<a name='L218'></a><a href='#L218'>218</a>
<a name='L219'></a><a href='#L219'>219</a>
<a name='L220'></a><a href='#L220'>220</a>
<a name='L221'></a><a href='#L221'>221</a>
<a name='L222'></a><a href='#L222'>222</a>
<a name='L223'></a><a href='#L223'>223</a>
<a name='L224'></a><a href='#L224'>224</a>
<a name='L225'></a><a href='#L225'>225</a>
<a name='L226'></a><a href='#L226'>226</a>
<a name='L227'></a><a href='#L227'>227</a>
<a name='L228'></a><a href='#L228'>228</a>
<a name='L229'></a><a href='#L229'>229</a>
<a name='L230'></a><a href='#L230'>230</a>
<a name='L231'></a><a href='#L231'>231</a>
<a name='L232'></a><a href='#L232'>232</a>
<a name='L233'></a><a href='#L233'>233</a>
<a name='L234'></a><a href='#L234'>234</a>
<a name='L235'></a><a href='#L235'>235</a>
<a name='L236'></a><a href='#L236'>236</a>
<a name='L237'></a><a href='#L237'>237</a>
<a name='L238'></a><a href='#L238'>238</a>
<a name='L239'></a><a href='#L239'>239</a>
<a name='L240'></a><a href='#L240'>240</a>
<a name='L241'></a><a href='#L241'>241</a>
<a name='L242'></a><a href='#L242'>242</a>
<a name='L243'></a><a href='#L243'>243</a>
<a name='L244'></a><a href='#L244'>244</a>
<a name='L245'></a><a href='#L245'>245</a>
<a name='L246'></a><a href='#L246'>246</a>
<a name='L247'></a><a href='#L247'>247</a>
<a name='L248'></a><a href='#L248'>248</a>
<a name='L249'></a><a href='#L249'>249</a>
<a name='L250'></a><a href='#L250'>250</a>
<a name='L251'></a><a href='#L251'>251</a>
<a name='L252'></a><a href='#L252'>252</a>
<a name='L253'></a><a href='#L253'>253</a>
<a name='L254'></a><a href='#L254'>254</a>
<a name='L255'></a><a href='#L255'>255</a>
<a name='L256'></a><a href='#L256'>256</a>
<a name='L257'></a><a href='#L257'>257</a>
<a name='L258'></a><a href='#L258'>258</a>
<a name='L259'></a><a href='#L259'>259</a>
<a name='L260'></a><a href='#L260'>260</a>
<a name='L261'></a><a href='#L261'>261</a>
<a name='L262'></a><a href='#L262'>262</a>
<a name='L263'></a><a href='#L263'>263</a>
<a name='L264'></a><a href='#L264'>264</a>
<a name='L265'></a><a href='#L265'>265</a>
<a name='L266'></a><a href='#L266'>266</a>
<a name='L267'></a><a href='#L267'>267</a>
<a name='L268'></a><a href='#L268'>268</a>
<a name='L269'></a><a href='#L269'>269</a>
<a name='L270'></a><a href='#L270'>270</a>
<a name='L271'></a><a href='#L271'>271</a>
<a name='L272'></a><a href='#L272'>272</a>
<a name='L273'></a><a href='#L273'>273</a>
<a name='L274'></a><a href='#L274'>274</a>
<a name='L275'></a><a href='#L275'>275</a>
<a name='L276'></a><a href='#L276'>276</a>
<a name='L277'></a><a href='#L277'>277</a>
<a name='L278'></a><a href='#L278'>278</a>
<a name='L279'></a><a href='#L279'>279</a>
<a name='L280'></a><a href='#L280'>280</a>
<a name='L281'></a><a href='#L281'>281</a>
<a name='L282'></a><a href='#L282'>282</a>
<a name='L283'></a><a href='#L283'>283</a>
<a name='L284'></a><a href='#L284'>284</a>
<a name='L285'></a><a href='#L285'>285</a>
<a name='L286'></a><a href='#L286'>286</a>
<a name='L287'></a><a href='#L287'>287</a>
<a name='L288'></a><a href='#L288'>288</a>
<a name='L289'></a><a href='#L289'>289</a>
<a name='L290'></a><a href='#L290'>290</a>
<a name='L291'></a><a href='#L291'>291</a>
<a name='L292'></a><a href='#L292'>292</a>
<a name='L293'></a><a href='#L293'>293</a>
<a name='L294'></a><a href='#L294'>294</a>
<a name='L295'></a><a href='#L295'>295</a>
<a name='L296'></a><a href='#L296'>296</a>
<a name='L297'></a><a href='#L297'>297</a>
<a name='L298'></a><a href='#L298'>298</a>
<a name='L299'></a><a href='#L299'>299</a>
<a name='L300'></a><a href='#L300'>300</a>
<a name='L301'></a><a href='#L301'>301</a>
<a name='L302'></a><a href='#L302'>302</a>
<a name='L303'></a><a href='#L303'>303</a>
<a name='L304'></a><a href='#L304'>304</a>
<a name='L305'></a><a href='#L305'>305</a>
<a name='L306'></a><a href='#L306'>306</a>
<a name='L307'></a><a href='#L307'>307</a>
<a name='L308'></a><a href='#L308'>308</a>
<a name='L309'></a><a href='#L309'>309</a>
<a name='L310'></a><a href='#L310'>310</a>
<a name='L311'></a><a href='#L311'>311</a>
<a name='L312'></a><a href='#L312'>312</a>
<a name='L313'></a><a href='#L313'>313</a>
<a name='L314'></a><a href='#L314'>314</a>
<a name='L315'></a><a href='#L315'>315</a>
<a name='L316'></a><a href='#L316'>316</a>
<a name='L317'></a><a href='#L317'>317</a>
<a name='L318'></a><a href='#L318'>318</a>
<a name='L319'></a><a href='#L319'>319</a>
<a name='L320'></a><a href='#L320'>320</a>
<a name='L321'></a><a href='#L321'>321</a>
<a name='L322'></a><a href='#L322'>322</a>
<a name='L323'></a><a href='#L323'>323</a>
<a name='L324'></a><a href='#L324'>324</a>
<a name='L325'></a><a href='#L325'>325</a>
<a name='L326'></a><a href='#L326'>326</a>
<a name='L327'></a><a href='#L327'>327</a>
<a name='L328'></a><a href='#L328'>328</a>
<a name='L329'></a><a href='#L329'>329</a>
<a name='L330'></a><a href='#L330'>330</a>
<a name='L331'></a><a href='#L331'>331</a>
<a name='L332'></a><a href='#L332'>332</a>
<a name='L333'></a><a href='#L333'>333</a>
<a name='L334'></a><a href='#L334'>334</a>
<a name='L335'></a><a href='#L335'>335</a>
<a name='L336'></a><a href='#L336'>336</a>
<a name='L337'></a><a href='#L337'>337</a>
<a name='L338'></a><a href='#L338'>338</a>
<a name='L339'></a><a href='#L339'>339</a>
<a name='L340'></a><a href='#L340'>340</a>
<a name='L341'></a><a href='#L341'>341</a>
<a name='L342'></a><a href='#L342'>342</a>
<a name='L343'></a><a href='#L343'>343</a>
<a name='L344'></a><a href='#L344'>344</a>
<a name='L345'></a><a href='#L345'>345</a>
<a name='L346'></a><a href='#L346'>346</a>
<a name='L347'></a><a href='#L347'>347</a>
<a name='L348'></a><a href='#L348'>348</a>
<a name='L349'></a><a href='#L349'>349</a>
<a name='L350'></a><a href='#L350'>350</a>
<a name='L351'></a><a href='#L351'>351</a>
<a name='L352'></a><a href='#L352'>352</a>
<a name='L353'></a><a href='#L353'>353</a>
<a name='L354'></a><a href='#L354'>354</a>
<a name='L355'></a><a href='#L355'>355</a>
<a name='L356'></a><a href='#L356'>356</a>
<a name='L357'></a><a href='#L357'>357</a>
<a name='L358'></a><a href='#L358'>358</a>
<a name='L359'></a><a href='#L359'>359</a>
<a name='L360'></a><a href='#L360'>360</a>
<a name='L361'></a><a href='#L361'>361</a>
<a name='L362'></a><a href='#L362'>362</a>
<a name='L363'></a><a href='#L363'>363</a>
<a name='L364'></a><a href='#L364'>364</a>
<a name='L365'></a><a href='#L365'>365</a>
<a name='L366'></a><a href='#L366'>366</a>
<a name='L367'></a><a href='#L367'>367</a>
<a name='L368'></a><a href='#L368'>368</a>
<a name='L369'></a><a href='#L369'>369</a>
<a name='L370'></a><a href='#L370'>370</a>
<a name='L371'></a><a href='#L371'>371</a>
<a name='L372'></a><a href='#L372'>372</a>
<a name='L373'></a><a href='#L373'>373</a>
<a name='L374'></a><a href='#L374'>374</a>
<a name='L375'></a><a href='#L375'>375</a>
<a name='L376'></a><a href='#L376'>376</a>
<a name='L377'></a><a href='#L377'>377</a>
<a name='L378'></a><a href='#L378'>378</a>
<a name='L379'></a><a href='#L379'>379</a>
<a name='L380'></a><a href='#L380'>380</a>
<a name='L381'></a><a href='#L381'>381</a>
<a name='L382'></a><a href='#L382'>382</a>
<a name='L383'></a><a href='#L383'>383</a>
<a name='L384'></a><a href='#L384'>384</a>
<a name='L385'></a><a href='#L385'>385</a>
<a name='L386'></a><a href='#L386'>386</a>
<a name='L387'></a><a href='#L387'>387</a>
<a name='L388'></a><a href='#L388'>388</a>
<a name='L389'></a><a href='#L389'>389</a>
<a name='L390'></a><a href='#L390'>390</a>
<a name='L391'></a><a href='#L391'>391</a>
<a name='L392'></a><a href='#L392'>392</a>
<a name='L393'></a><a href='#L393'>393</a>
<a name='L394'></a><a href='#L394'>394</a>
<a name='L395'></a><a href='#L395'>395</a>
<a name='L396'></a><a href='#L396'>396</a>
<a name='L397'></a><a href='#L397'>397</a>
<a name='L398'></a><a href='#L398'>398</a>
<a name='L399'></a><a href='#L399'>399</a>
<a name='L400'></a><a href='#L400'>400</a>
<a name='L401'></a><a href='#L401'>401</a>
<a name='L402'></a><a href='#L402'>402</a>
<a name='L403'></a><a href='#L403'>403</a>
<a name='L404'></a><a href='#L404'>404</a>
<a name='L405'></a><a href='#L405'>405</a>
<a name='L406'></a><a href='#L406'>406</a>
<a name='L407'></a><a href='#L407'>407</a>
<a name='L408'></a><a href='#L408'>408</a>
<a name='L409'></a><a href='#L409'>409</a>
<a name='L410'></a><a href='#L410'>410</a>
<a name='L411'></a><a href='#L411'>411</a>
<a name='L412'></a><a href='#L412'>412</a>
<a name='L413'></a><a href='#L413'>413</a>
<a name='L414'></a><a href='#L414'>414</a>
<a name='L415'></a><a href='#L415'>415</a>
<a name='L416'></a><a href='#L416'>416</a>
<a name='L417'></a><a href='#L417'>417</a>
<a name='L418'></a><a href='#L418'>418</a>
<a name='L419'></a><a href='#L419'>419</a>
<a name='L420'></a><a href='#L420'>420</a>
<a name='L421'></a><a href='#L421'>421</a>
<a name='L422'></a><a href='#L422'>422</a>
<a name='L423'></a><a href='#L423'>423</a>
<a name='L424'></a><a href='#L424'>424</a>
<a name='L425'></a><a href='#L425'>425</a>
<a name='L426'></a><a href='#L426'>426</a>
<a name='L427'></a><a href='#L427'>427</a>
<a name='L428'></a><a href='#L428'>428</a>
<a name='L429'></a><a href='#L429'>429</a>
<a name='L430'></a><a href='#L430'>430</a>
<a name='L431'></a><a href='#L431'>431</a>
<a name='L432'></a><a href='#L432'>432</a>
<a name='L433'></a><a href='#L433'>433</a>
<a name='L434'></a><a href='#L434'>434</a>
<a name='L435'></a><a href='#L435'>435</a>
<a name='L436'></a><a href='#L436'>436</a>
<a name='L437'></a><a href='#L437'>437</a>
<a name='L438'></a><a href='#L438'>438</a>
<a name='L439'></a><a href='#L439'>439</a>
<a name='L440'></a><a href='#L440'>440</a>
<a name='L441'></a><a href='#L441'>441</a>
<a name='L442'></a><a href='#L442'>442</a>
<a name='L443'></a><a href='#L443'>443</a>
<a name='L444'></a><a href='#L444'>444</a>
<a name='L445'></a><a href='#L445'>445</a>
<a name='L446'></a><a href='#L446'>446</a>
<a name='L447'></a><a href='#L447'>447</a>
<a name='L448'></a><a href='#L448'>448</a>
<a name='L449'></a><a href='#L449'>449</a>
<a name='L450'></a><a href='#L450'>450</a>
<a name='L451'></a><a href='#L451'>451</a>
<a name='L452'></a><a href='#L452'>452</a>
<a name='L453'></a><a href='#L453'>453</a>
<a name='L454'></a><a href='#L454'>454</a>
<a name='L455'></a><a href='#L455'>455</a>
<a name='L456'></a><a href='#L456'>456</a>
<a name='L457'></a><a href='#L457'>457</a>
<a name='L458'></a><a href='#L458'>458</a>
<a name='L459'></a><a href='#L459'>459</a>
<a name='L460'></a><a href='#L460'>460</a>
<a name='L461'></a><a href='#L461'>461</a>
<a name='L462'></a><a href='#L462'>462</a>
<a name='L463'></a><a href='#L463'>463</a>
<a name='L464'></a><a href='#L464'>464</a>
<a name='L465'></a><a href='#L465'>465</a>
<a name='L466'></a><a href='#L466'>466</a>
<a name='L467'></a><a href='#L467'>467</a>
<a name='L468'></a><a href='#L468'>468</a>
<a name='L469'></a><a href='#L469'>469</a>
<a name='L470'></a><a href='#L470'>470</a>
<a name='L471'></a><a href='#L471'>471</a>
<a name='L472'></a><a href='#L472'>472</a>
<a name='L473'></a><a href='#L473'>473</a>
<a name='L474'></a><a href='#L474'>474</a>
<a name='L475'></a><a href='#L475'>475</a>
<a name='L476'></a><a href='#L476'>476</a>
<a name='L477'></a><a href='#L477'>477</a>
<a name='L478'></a><a href='#L478'>478</a>
<a name='L479'></a><a href='#L479'>479</a>
<a name='L480'></a><a href='#L480'>480</a>
<a name='L481'></a><a href='#L481'>481</a>
<a name='L482'></a><a href='#L482'>482</a>
<a name='L483'></a><a href='#L483'>483</a>
<a name='L484'></a><a href='#L484'>484</a>
<a name='L485'></a><a href='#L485'>485</a>
<a name='L486'></a><a href='#L486'>486</a>
<a name='L487'></a><a href='#L487'>487</a>
<a name='L488'></a><a href='#L488'>488</a>
<a name='L489'></a><a href='#L489'>489</a>
<a name='L490'></a><a href='#L490'>490</a>
<a name='L491'></a><a href='#L491'>491</a>
<a name='L492'></a><a href='#L492'>492</a>
<a name='L493'></a><a href='#L493'>493</a>
<a name='L494'></a><a href='#L494'>494</a>
<a name='L495'></a><a href='#L495'>495</a>
<a name='L496'></a><a href='#L496'>496</a>
<a name='L497'></a><a href='#L497'>497</a>
<a name='L498'></a><a href='#L498'>498</a>
<a name='L499'></a><a href='#L499'>499</a>
<a name='L500'></a><a href='#L500'>500</a>
<a name='L501'></a><a href='#L501'>501</a>
<a name='L502'></a><a href='#L502'>502</a>
<a name='L503'></a><a href='#L503'>503</a>
<a name='L504'></a><a href='#L504'>504</a>
<a name='L505'></a><a href='#L505'>505</a>
<a name='L506'></a><a href='#L506'>506</a>
<a name='L507'></a><a href='#L507'>507</a>
<a name='L508'></a><a href='#L508'>508</a>
<a name='L509'></a><a href='#L509'>509</a>
<a name='L510'></a><a href='#L510'>510</a>
<a name='L511'></a><a href='#L511'>511</a>
<a name='L512'></a><a href='#L512'>512</a>
<a name='L513'></a><a href='#L513'>513</a>
<a name='L514'></a><a href='#L514'>514</a>
<a name='L515'></a><a href='#L515'>515</a>
<a name='L516'></a><a href='#L516'>516</a>
<a name='L517'></a><a href='#L517'>517</a>
<a name='L518'></a><a href='#L518'>518</a>
<a name='L519'></a><a href='#L519'>519</a>
<a name='L520'></a><a href='#L520'>520</a>
<a name='L521'></a><a href='#L521'>521</a>
<a name='L522'></a><a href='#L522'>522</a>
<a name='L523'></a><a href='#L523'>523</a>
<a name='L524'></a><a href='#L524'>524</a>
<a name='L525'></a><a href='#L525'>525</a>
<a name='L526'></a><a href='#L526'>526</a>
<a name='L527'></a><a href='#L527'>527</a>
<a name='L528'></a><a href='#L528'>528</a>
<a name='L529'></a><a href='#L529'>529</a>
<a name='L530'></a><a href='#L530'>530</a>
<a name='L531'></a><a href='#L531'>531</a>
<a name='L532'></a><a href='#L532'>532</a>
<a name='L533'></a><a href='#L533'>533</a>
<a name='L534'></a><a href='#L534'>534</a>
<a name='L535'></a><a href='#L535'>535</a>
<a name='L536'></a><a href='#L536'>536</a>
<a name='L537'></a><a href='#L537'>537</a>
<a name='L538'></a><a href='#L538'>538</a>
<a name='L539'></a><a href='#L539'>539</a>
<a name='L540'></a><a href='#L540'>540</a>
<a name='L541'></a><a href='#L541'>541</a>
<a name='L542'></a><a href='#L542'>542</a>
<a name='L543'></a><a href='#L543'>543</a>
<a name='L544'></a><a href='#L544'>544</a>
<a name='L545'></a><a href='#L545'>545</a>
<a name='L546'></a><a href='#L546'>546</a>
<a name='L547'></a><a href='#L547'>547</a>
<a name='L548'></a><a href='#L548'>548</a>
<a name='L549'></a><a href='#L549'>549</a>
<a name='L550'></a><a href='#L550'>550</a>
<a name='L551'></a><a href='#L551'>551</a>
<a name='L552'></a><a href='#L552'>552</a>
<a name='L553'></a><a href='#L553'>553</a>
<a name='L554'></a><a href='#L554'>554</a>
<a name='L555'></a><a href='#L555'>555</a>
<a name='L556'></a><a href='#L556'>556</a>
<a name='L557'></a><a href='#L557'>557</a>
<a name='L558'></a><a href='#L558'>558</a>
<a name='L559'></a><a href='#L559'>559</a>
<a name='L560'></a><a href='#L560'>560</a>
<a name='L561'></a><a href='#L561'>561</a>
<a name='L562'></a><a href='#L562'>562</a>
<a name='L563'></a><a href='#L563'>563</a>
<a name='L564'></a><a href='#L564'>564</a>
<a name='L565'></a><a href='#L565'>565</a>
<a name='L566'></a><a href='#L566'>566</a>
<a name='L567'></a><a href='#L567'>567</a>
<a name='L568'></a><a href='#L568'>568</a>
<a name='L569'></a><a href='#L569'>569</a>
<a name='L570'></a><a href='#L570'>570</a>
<a name='L571'></a><a href='#L571'>571</a>
<a name='L572'></a><a href='#L572'>572</a>
<a name='L573'></a><a href='#L573'>573</a>
<a name='L574'></a><a href='#L574'>574</a>
<a name='L575'></a><a href='#L575'>575</a>
<a name='L576'></a><a href='#L576'>576</a>
<a name='L577'></a><a href='#L577'>577</a>
<a name='L578'></a><a href='#L578'>578</a>
<a name='L579'></a><a href='#L579'>579</a>
<a name='L580'></a><a href='#L580'>580</a>
<a name='L581'></a><a href='#L581'>581</a>
<a name='L582'></a><a href='#L582'>582</a>
<a name='L583'></a><a href='#L583'>583</a>
<a name='L584'></a><a href='#L584'>584</a></td><td class="line-coverage quiet"><span class="cline-any cline-no">&nbsp;</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >/**<span class="fstat-no" title="function not covered" ><span class="branch-0 cbranch-no" title="branch not covered" ></span></span></span>
 * 统一的 LLM 服务 - Provider Registry 模式
 *
 * 架构改进:
 * 1. 供应商级别的 Provider 抽象（ILlmProvider）
 * 2. 注册表管理（ProviderRegistry），统一调度和熔断
 * 3. 公共 API 保持向后兼容（callLLM, callLLMWithMessages, callLLMWithTools, callLLMStream）
 *
 * 供应商优先级由 models.json 中的 priority 字段决定。
 * 调度策略: 同供应商 Key 轮转 → 跨供应商降级（优先同名/别名模型）
 */
&nbsp;
import { ChatOpenAI } from '@langchain/openai';
import { HumanMessage, SystemMessage, AIMessage, BaseMessage, ToolMessage } from '@langchain/core/messages';
import { tool } from '@langchain/core/tools';
import { z } from 'zod';
import { withAiLog } from '../ai-call-logger';
import { config } from '../../config';
import {
  getLlmRegistry,
  findProviderNodeForModel,
  getToolCapableModels,
  getNextToolCapableModel as getNextToolCapable,
  getDefaultModelId,
  initLlmRegistry,
  startHealthCheck,
} from './provider.registry';
import { ILlmProvider } from './provider.interface';
import { CircuitBreakerOpenError } from '../../common/circuit-breaker';
import { cleanLlmResponse } from './response-cleaner';
&nbsp;
/** 检测额度耗尽错误的错误消息模式 */
<span class="cstat-no" title="statement not covered" >const EXHAUSTED_PATTERNS = [</span>
<span class="cstat-no" title="statement not covered" >  'quota', 'balance', 'insufficient', '额度', '余额', '用量',</span>
<span class="cstat-no" title="statement not covered" >  'rate limit', 'too many requests',</span>
<span class="cstat-no" title="statement not covered" >];</span>
&nbsp;
export type ChatMessage = {
  role: 'system' | 'user' | 'assistant';
  content: string;
};
&nbsp;
export type ToolDefinition = {
  name: string;
  description: string;
  inputSchema: z.ZodObject&lt;any&gt;;
  execute: (input: any) =&gt; Promise&lt;any&gt;;
};
&nbsp;
export type ToolCallResult = {
  text: string;
  toolCalls: Array&lt;{
    name: string;
    input: any;
    result: any;
  }&gt;;
};
&nbsp;
// 模型缓存（按 modelId 缓存 ChatOpenAI 实例）
<span class="cstat-no" title="statement not covered" >const modelCache: Map&lt;string, ChatOpenAI&gt; = new Map();</span>
&nbsp;
// ============ 供应商/模型选择调度 ============
&nbsp;
/**
 * 文本模型选择策略
 */
type SelectionStrategy = 'round-robin' | 'random' | 'weighted';
&nbsp;
/**
 * 选择文本模型
 * @param preferredModel 用户偏好的模型名（可选）
 * @param strategy 选择策略，默认 round-robin
 * @returns 模型ID 或 null
 */
<span class="cstat-no" title="statement not covered" >export function selectTextModel(</span>
<span class="cstat-no" title="statement not covered" >  preferredModel?: string,</span>
<span class="cstat-no" title="statement not covered" >  strategy: SelectionStrategy = 'round-robin'</span>
<span class="cstat-no" title="statement not covered" >): string | null {</span>
<span class="cstat-no" title="statement not covered" >  const registry = getLlmRegistry();</span>
<span class="cstat-no" title="statement not covered" >  const available = registry.listAvailable();</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  if (available.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >    console.warn('[LLM] 没有可用的文本模型供应商');</span>
<span class="cstat-no" title="statement not covered" >    return null;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 按策略选择供应商
<span class="cstat-no" title="statement not covered" >  let vendorNode = available[0];</span>
<span class="cstat-no" title="statement not covered" >  if (strategy === 'random') {</span>
<span class="cstat-no" title="statement not covered" >    vendorNode = available[Math.floor(Math.random() * available.length)];</span>
<span class="cstat-no" title="statement not covered" >  } else if (strategy === 'round-robin') {</span>
    // 轮转：基于时间戳简单轮转
<span class="cstat-no" title="statement not covered" >    const idx = Math.floor(Date.now() / 1000) % available.length;</span>
<span class="cstat-no" title="statement not covered" >    vendorNode = available[idx];</span>
<span class="cstat-no" title="statement not covered" >  }</span>
  // weighted 暂未实现
&nbsp;
  // 优先用用户指定的模型
<span class="cstat-no" title="statement not covered" >  if (preferredModel &amp;&amp; vendorNode.provider.hasModel(preferredModel)) {</span>
<span class="cstat-no" title="statement not covered" >    return preferredModel;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 检查该供应商是否支持工具调用
<span class="cstat-no" title="statement not covered" >  const toolModels = vendorNode.provider.textModels.filter(id =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    const cfg = vendorNode.provider.getModelConfig(id);</span>
<span class="cstat-no" title="statement not covered" >    return cfg?.supportsToolCall;</span>
<span class="cstat-no" title="statement not covered" >  });</span>
&nbsp;
  // 优先选支持工具调用的模型
<span class="cstat-no" title="statement not covered" >  if (toolModels.length &gt; 0) {</span>
<span class="cstat-no" title="statement not covered" >    return toolModels[0];</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 否则选第一个文本模型
<span class="cstat-no" title="statement not covered" >  const firstModel = vendorNode.provider.textModels[0];</span>
<span class="cstat-no" title="statement not covered" >  return firstModel || null;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 获取文本模型的供应商节点
 */
<span class="cstat-no" title="statement not covered" >function findVendorForModel(modelId: string) {</span>
<span class="cstat-no" title="statement not covered" >  const registry = getLlmRegistry();</span>
<span class="cstat-no" title="statement not covered" >  return registry.listAvailable().find(n =&gt; n.provider.hasModel(modelId));</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ============ 内部辅助 ============
&nbsp;
/**
 * 创建 ChatOpenAI 实例
 * @param modelId  模型 ID
 * @param options  覆盖参数（temperature, maxTokens）
 */
<span class="cstat-no" title="statement not covered" >function createClient(modelId: string, options?: { temperature?: number; maxTokens?: number }): ChatOpenAI {</span>
<span class="cstat-no" title="statement not covered" >  const node = findVendorForModel(modelId);</span>
<span class="cstat-no" title="statement not covered" >  if (!node) throw new Error(`没有找到模型 ${modelId} 所属的供应商`);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const provider = node.provider;</span>
<span class="cstat-no" title="statement not covered" >  return provider.createClient(modelId, options);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 获取 ChatOpenAI 实例（带缓存）
 * - 未指定 maxTokens 时使用缓存实例
 * - 指定 maxTokens 时创建新实例（不缓存）
 */
<span class="cstat-no" title="statement not covered" >export function getLLM(modelId?: string, maxTokens?: number): ChatOpenAI {</span>
<span class="cstat-no" title="statement not covered" >  const id = modelId || getDefaultModelId();</span>
<span class="cstat-no" title="statement not covered" >  if (maxTokens !== undefined) {</span>
<span class="cstat-no" title="statement not covered" >    return createClient(id, { maxTokens });</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >  if (!modelCache.has(id)) {</span>
<span class="cstat-no" title="statement not covered" >    modelCache.set(id, createClient(id));</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >  return modelCache.get(id)!;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 获取支持工具调用的模型
 */
<span class="cstat-no" title="statement not covered" >export function getToolCapableModel(preferredModelId?: string): ChatOpenAI {</span>
<span class="cstat-no" title="statement not covered" >  if (preferredModelId) {</span>
<span class="cstat-no" title="statement not covered" >    const node = findVendorForModel(preferredModelId);</span>
<span class="cstat-no" title="statement not covered" >    const cfg = node?.provider.getModelConfig(preferredModelId);</span>
<span class="cstat-no" title="statement not covered" >    if (cfg?.supportsToolCall) return getLLM(preferredModelId);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const toolModels = getToolCapableModels();</span>
<span class="cstat-no" title="statement not covered" >  if (toolModels.length === 0) throw new Error('没有可用的支持工具调用的模型');</span>
&nbsp;
  // 使用轮转策略选择一个支持工具调用的模型
<span class="cstat-no" title="statement not covered" >  const selectedModelId = selectTextModel(undefined, 'round-robin');</span>
<span class="cstat-no" title="statement not covered" >  if (!selectedModelId) throw new Error('没有可用的文本模型');</span>
<span class="cstat-no" title="statement not covered" >  return getLLM(selectedModelId);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 获取下一个支持工具调用的模型（用于自动切换）
 */
<span class="cstat-no" title="statement not covered" >export function getNextToolCapableModel(currentModelId: string): string | null {</span>
<span class="cstat-no" title="statement not covered" >  return getNextToolCapable(currentModelId);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ============ 消息格式转换 ============
&nbsp;
<span class="cstat-no" title="statement not covered" >function toBaseMessages(messages: ChatMessage[]): BaseMessage[] {</span>
<span class="cstat-no" title="statement not covered" >  return messages.map((m) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >    if (m.role === 'system') return new SystemMessage(m.content);</span>
<span class="cstat-no" title="statement not covered" >    if (m.role === 'assistant') return new AIMessage(m.content);</span>
<span class="cstat-no" title="statement not covered" >    return new HumanMessage(m.content);</span>
<span class="cstat-no" title="statement not covered" >  });</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ============ 核心调用接口（向后兼容） ============
&nbsp;
/** 重试延迟（ms） */
<span class="cstat-no" title="statement not covered" >const RETRY_DELAY_MS = 2000;</span>
&nbsp;
/**
 * 根据 modelId 解析出实际的供应商 key
 */
<span class="cstat-no" title="statement not covered" >function resolveProviderKey(modelId: string): string {</span>
<span class="cstat-no" title="statement not covered" >  const cfg = (config.models as any).getModel?.(modelId);</span>
<span class="cstat-no" title="statement not covered" >  if (cfg?.vendor) return cfg.vendor;</span>
  // fallback: 从 registry 查找
<span class="cstat-no" title="statement not covered" >  const registry = getLlmRegistry();</span>
<span class="cstat-no" title="statement not covered" >  for (const node of registry.listEnabled()) {</span>
<span class="cstat-no" title="statement not covered" >    if (node.provider.hasModel(modelId)) return node.provider.vendor;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >  return modelId;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 带重试的调用包装
 * 失败后先同模型重试1次（2s延迟），仍失败再切换供应商
 */
<span class="cstat-no" title="statement not covered" >async function invokeWithRetry&lt;T&gt;(</span>
<span class="cstat-no" title="statement not covered" >  fn: () =&gt; Promise&lt;T&gt;,</span>
<span class="cstat-no" title="statement not covered" >  modelId: string,</span>
<span class="cstat-no" title="statement not covered" >  onSwitch: (nextModelId: string) =&gt; Promise&lt;T&gt;,</span>
<span class="cstat-no" title="statement not covered" >  callType: string = 'llm_chat',</span>
<span class="cstat-no" title="statement not covered" >): Promise&lt;T&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const provider = resolveProviderKey(modelId);</span>
&nbsp;
  // 第1次尝试
<span class="cstat-no" title="statement not covered" >  try {</span>
<span class="cstat-no" title="statement not covered" >    return await withAiLog(fn, { callType, provider, model: modelId });</span>
<span class="cstat-no" title="statement not covered" >  } catch (error: any) {</span>
    // 不可切换的错误，直接抛出
<span class="cstat-no" title="statement not covered" >    if (!config.models.shouldSwitchModel(error?.message || '')) {</span>
<span class="cstat-no" title="statement not covered" >      throw error;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
    // 可切换错误：先重试1次（可能是瞬时波动）
<span class="cstat-no" title="statement not covered" >    console.log(`[LLM] ${modelId} 调用失败，2s后重试...`);</span>
<span class="cstat-no" title="statement not covered" >    await new Promise(resolve =&gt; setTimeout(resolve, RETRY_DELAY_MS));</span>
<span class="cstat-no" title="statement not covered" >    try {</span>
      // 第2次尝试（同模型重试，记录日志）
<span class="cstat-no" title="statement not covered" >      const retryResult = await withAiLog(</span>
<span class="cstat-no" title="statement not covered" >        fn,</span>
<span class="cstat-no" title="statement not covered" >        { callType: `${callType}_retry1`, provider, model: modelId }</span>
<span class="cstat-no" title="statement not covered" >      );</span>
<span class="cstat-no" title="statement not covered" >      return retryResult;</span>
<span class="cstat-no" title="statement not covered" >    } catch (retryError: any) {</span>
      // 重试仍失败，切换供应商
<span class="cstat-no" title="statement not covered" >      const nextModel = trySwitchModel(modelId, retryError);</span>
<span class="cstat-no" title="statement not covered" >      if (nextModel) {</span>
<span class="cstat-no" title="statement not covered" >        return onSwitch(nextModel);</span>
<span class="cstat-no" title="statement not covered" >      }</span>
<span class="cstat-no" title="statement not covered" >      throw retryError;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 原始字符串调用（向后兼容）
 * 内部使用注册表 + 熔断器实现自动降级
 */
<span class="cstat-no" title="statement not covered" >export async function callLLM(prompt: string, modelId?: string): Promise&lt;string&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const id = modelId || getDefaultModelId();</span>
<span class="cstat-no" title="statement not covered" >  return invokeWithRetry(</span>
<span class="cstat-no" title="statement not covered" >    async () =&gt; {</span>
<span class="cstat-no" title="statement not covered" >      const llm = getLLM(id);</span>
<span class="cstat-no" title="statement not covered" >      const response = await llm.invoke(prompt);</span>
<span class="cstat-no" title="statement not covered" >      return cleanLlmResponse(response.content as string);</span>
<span class="cstat-no" title="statement not covered" >    },</span>
<span class="cstat-no" title="statement not covered" >    id,</span>
<span class="cstat-no" title="statement not covered" >    (nextModel) =&gt; callLLM(prompt, nextModel),</span>
<span class="cstat-no" title="statement not covered" >  );</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 消息格式调用 - 支持 system/user/assistant 角色
 */
<span class="cstat-no" title="statement not covered" >export async function callLLMWithMessages(</span>
<span class="cstat-no" title="statement not covered" >  messages: ChatMessage[],</span>
<span class="cstat-no" title="statement not covered" >  modelId?: string,</span>
<span class="cstat-no" title="statement not covered" >  maxTokens?: number</span>
<span class="cstat-no" title="statement not covered" >): Promise&lt;string&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const id = modelId || getDefaultModelId();</span>
&nbsp;
  // 请求日志
<span class="cstat-no" title="statement not covered" >  console.log('[AI请求] ===== 开始 =====');</span>
<span class="cstat-no" title="statement not covered" >  console.log('[AI请求] 模型:', id, maxTokens !== undefined ? `(maxTokens=${maxTokens})` : '');</span>
<span class="cstat-no" title="statement not covered" >  console.log('[AI请求] 消息数:', messages.length);</span>
<span class="cstat-no" title="statement not covered" >  const systemMsg = messages.find(m =&gt; m.role === 'system');</span>
<span class="cstat-no" title="statement not covered" >  if (systemMsg) {</span>
<span class="cstat-no" title="statement not covered" >    console.log('[AI请求] System提示词 (前200字):', systemMsg.content.substring(0, 200));</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 解析 provider
<span class="cstat-no" title="statement not covered" >  const provider = resolveProviderKey(id);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  try {</span>
<span class="cstat-no" title="statement not covered" >    const llm = getLLM(id, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >    const baseMessages = toBaseMessages(messages);</span>
<span class="cstat-no" title="statement not covered" >    const prompt = messages.map(m =&gt; `${m.role}: ${m.content}`).join('\n');</span>
<span class="cstat-no" title="statement not covered" >    const response = await withAiLog(</span>
<span class="cstat-no" title="statement not covered" >      () =&gt; llm.invoke(baseMessages as any),</span>
<span class="cstat-no" title="statement not covered" >      { callType: 'llm_chat', provider, model: id, textLen: messages.reduce((s, m) =&gt; s + (m.content?.length || 0), 0), prompt }</span>
<span class="cstat-no" title="statement not covered" >    );</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    const responseContent = cleanLlmResponse(response.content as string);</span>
<span class="cstat-no" title="statement not covered" >    console.log('[AI响应] 内容 (前1000字):', responseContent.substring(0, 1000));</span>
<span class="cstat-no" title="statement not covered" >    if (responseContent.length &gt; 1000) {</span>
<span class="cstat-no" title="statement not covered" >      console.log('[AI响应] ... (总长度:', responseContent.length, '字)');</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >    console.log('[AI响应] ===== 结束 =====');</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    return responseContent;</span>
<span class="cstat-no" title="statement not covered" >  } catch (error: any) {</span>
    // 不可切换的错误，直接抛出
<span class="cstat-no" title="statement not covered" >    if (!config.models.shouldSwitchModel(error?.message || '')) {</span>
<span class="cstat-no" title="statement not covered" >      throw error;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
    // 可切换错误：先重试1次
<span class="cstat-no" title="statement not covered" >    console.log(`[LLM] ${id} 消息调用失败，2s后重试...`);</span>
<span class="cstat-no" title="statement not covered" >    await new Promise(resolve =&gt; setTimeout(resolve, RETRY_DELAY_MS));</span>
<span class="cstat-no" title="statement not covered" >    try {</span>
<span class="cstat-no" title="statement not covered" >      const llm = getLLM(id, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >      const baseMessages = toBaseMessages(messages);</span>
<span class="cstat-no" title="statement not covered" >      const prompt = messages.map(m =&gt; `${m.role}: ${m.content}`).join('\n');</span>
<span class="cstat-no" title="statement not covered" >      const response = await withAiLog(</span>
<span class="cstat-no" title="statement not covered" >        () =&gt; llm.invoke(baseMessages as any),</span>
<span class="cstat-no" title="statement not covered" >        { callType: 'llm_chat_retry', provider, model: id, textLen: messages.reduce((s, m) =&gt; s + (m.content?.length || 0), 0), prompt }</span>
<span class="cstat-no" title="statement not covered" >      );</span>
<span class="cstat-no" title="statement not covered" >      const responseContent = cleanLlmResponse(response.content as string);</span>
<span class="cstat-no" title="statement not covered" >      console.log('[AI响应] 重试成功 (前1000字):', responseContent.substring(0, 1000));</span>
<span class="cstat-no" title="statement not covered" >      console.log('[AI响应] ===== 结束 =====');</span>
<span class="cstat-no" title="statement not covered" >      return responseContent;</span>
<span class="cstat-no" title="statement not covered" >    } catch (retryError: any) {</span>
<span class="cstat-no" title="statement not covered" >      const nextModel = trySwitchModel(id, retryError);</span>
<span class="cstat-no" title="statement not covered" >      if (nextModel) {</span>
<span class="cstat-no" title="statement not covered" >        console.log(`[LLM] ${id} 重试仍失败，切换到 ${nextModel}`);</span>
<span class="cstat-no" title="statement not covered" >        return callLLMWithMessages(messages, nextModel, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >      }</span>
<span class="cstat-no" title="statement not covered" >      throw retryError;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 工具调用 - 让 LLM 能调用外部工具
 * 支持模型自动切换
 */
<span class="cstat-no" title="statement not covered" >export async function callLLMWithTools(</span>
<span class="cstat-no" title="statement not covered" >  messages: ChatMessage[],</span>
<span class="cstat-no" title="statement not covered" >  tools: ToolDefinition[],</span>
<span class="cstat-no" title="statement not covered" >  modelId?: string,</span>
<span class="cstat-no" title="statement not covered" >  maxRounds = 5,</span>
<span class="cstat-no" title="statement not covered" >  maxTokens?: number</span>
<span class="cstat-no" title="statement not covered" >): Promise&lt;ToolCallResult&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const effectiveModelId = modelId || getDefaultModelId();</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  if (!effectiveModelId) {</span>
<span class="cstat-no" title="statement not covered" >    throw new Error('没有可用的支持工具调用的模型');</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  return callLLMWithToolsImpl(messages, tools, effectiveModelId, maxRounds, undefined, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >async function callLLMWithToolsImpl(</span>
<span class="cstat-no" title="statement not covered" >  messages: ChatMessage[],</span>
<span class="cstat-no" title="statement not covered" >  tools: ToolDefinition[],</span>
<span class="cstat-no" title="statement not covered" >  modelId: string,</span>
<span class="cstat-no" title="statement not covered" >  maxRounds: number,</span>
<span class="cstat-no" title="statement not covered" >  attemptedModels: Set&lt;string&gt; = new Set(),</span>
<span class="cstat-no" title="statement not covered" >  maxTokens?: number</span>
<span class="cstat-no" title="statement not covered" >): Promise&lt;ToolCallResult&gt; {</span>
<span class="cstat-no" title="statement not covered" >  if (attemptedModels.has(modelId)) {</span>
<span class="cstat-no" title="statement not covered" >    const nextModel = getNextToolCapableModel(modelId);</span>
<span class="cstat-no" title="statement not covered" >    if (nextModel &amp;&amp; !attemptedModels.has(nextModel)) {</span>
<span class="cstat-no" title="statement not covered" >      return callLLMWithToolsImpl(messages, tools, nextModel, maxRounds, attemptedModels, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >    throw new Error('所有支持工具调用的模型都不可用');</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >  attemptedModels.add(modelId);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  let llm: ChatOpenAI;</span>
<span class="cstat-no" title="statement not covered" >  try {</span>
<span class="cstat-no" title="statement not covered" >    llm = getLLM(modelId, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >  } catch (err) {</span>
<span class="cstat-no" title="statement not covered" >    const nextModel = getNextToolCapableModel(modelId);</span>
<span class="cstat-no" title="statement not covered" >    if (nextModel &amp;&amp; !attemptedModels.has(nextModel)) {</span>
<span class="cstat-no" title="statement not covered" >      return callLLMWithToolsImpl(messages, tools, nextModel, maxRounds, attemptedModels, maxTokens);</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >    throw err;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const lcTools = tools.map((t) =&gt;</span>
<span class="cstat-no" title="statement not covered" >    tool(t.execute, {</span>
<span class="cstat-no" title="statement not covered" >      name: t.name,</span>
<span class="cstat-no" title="statement not covered" >      description: t.description,</span>
<span class="cstat-no" title="statement not covered" >      schema: t.inputSchema,</span>
<span class="cstat-no" title="statement not covered" >    })</span>
<span class="cstat-no" title="statement not covered" >  );</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const llmWithTools = llm.bindTools(lcTools as any);</span>
<span class="cstat-no" title="statement not covered" >  const conversationMessages: any[] = toBaseMessages(messages);</span>
<span class="cstat-no" title="statement not covered" >  const toolCallResults: ToolCallResult['toolCalls'] = [];</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  for (let round = 0; round &lt; maxRounds; round++) {</span>
<span class="cstat-no" title="statement not covered" >    let response: any;</span>
<span class="cstat-no" title="statement not covered" >    try {</span>
<span class="cstat-no" title="statement not covered" >      const prompt = conversationMessages.map(m =&gt; `${m._getType()}: ${m.content}`).join('\n');</span>
<span class="cstat-no" title="statement not covered" >      response = await withAiLog(</span>
<span class="cstat-no" title="statement not covered" >        () =&gt; llmWithTools.invoke(conversationMessages as any),</span>
<span class="cstat-no" title="statement not covered" >        { callType: 'llm_tools', provider: resolveProviderKey(modelId), model: modelId, prompt }</span>
<span class="cstat-no" title="statement not covered" >      );</span>
<span class="cstat-no" title="statement not covered" >    } catch (err: any) {</span>
<span class="cstat-no" title="statement not covered" >      console.warn(`[LLM] 模型 ${modelId} 调用失败: ${err?.message}，尝试下一个模型`);</span>
<span class="cstat-no" title="statement not covered" >      const nextModel = getNextToolCapableModel(modelId);</span>
<span class="cstat-no" title="statement not covered" >      if (nextModel &amp;&amp; !attemptedModels.has(nextModel)) {</span>
<span class="cstat-no" title="statement not covered" >        return callLLMWithToolsImpl(messages, tools, nextModel, maxRounds, attemptedModels);</span>
<span class="cstat-no" title="statement not covered" >      }</span>
<span class="cstat-no" title="statement not covered" >      throw err;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >    conversationMessages.push(response);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (!response.tool_calls || response.tool_calls.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >      return {</span>
<span class="cstat-no" title="statement not covered" >        text: response.content as string,</span>
<span class="cstat-no" title="statement not covered" >        toolCalls: toolCallResults,</span>
<span class="cstat-no" title="statement not covered" >      };</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    for (const toolCall of response.tool_calls) {</span>
<span class="cstat-no" title="statement not covered" >      const toolDef = tools.find((t) =&gt; t.name === toolCall.name);</span>
<span class="cstat-no" title="statement not covered" >      if (!toolDef) continue;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >      console.log(`[LLM] 工具调用: ${toolCall.name}`, toolCall.args);</span>
<span class="cstat-no" title="statement not covered" >      const result = await toolDef.execute(toolCall.args);</span>
<span class="cstat-no" title="statement not covered" >      const resultStr = typeof result === 'string' ? result : JSON.stringify(result);</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >      toolCallResults.push({ name: toolCall.name, input: toolCall.args, result });</span>
<span class="cstat-no" title="statement not covered" >      conversationMessages.push(new ToolMessage({ content: resultStr, tool_call_id: toolCall.id! }));</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  const lastMsg = conversationMessages[conversationMessages.length - 1];</span>
<span class="cstat-no" title="statement not covered" >  return {</span>
<span class="cstat-no" title="statement not covered" >    text: typeof lastMsg.content === 'string' ? lastMsg.content : '',</span>
<span class="cstat-no" title="statement not covered" >    toolCalls: toolCallResults,</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 流式调用
 */
<span class="cstat-no" title="statement not covered" >export async function* callLLMStream(</span>
<span class="cstat-no" title="statement not covered" >  prompt: string,</span>
<span class="cstat-no" title="statement not covered" >  modelId?: string</span>
<span class="cstat-no" title="statement not covered" >): AsyncGenerator&lt;string&gt; {</span>
<span class="cstat-no" title="statement not covered" >  const id = modelId || getDefaultModelId();</span>
  // 流式调用也加重试
<span class="cstat-no" title="statement not covered" >  try {</span>
<span class="cstat-no" title="statement not covered" >    const llm = getLLM(id);</span>
<span class="cstat-no" title="statement not covered" >    const stream = await llm.stream(prompt);</span>
<span class="cstat-no" title="statement not covered" >    const chunks: string[] = [];</span>
<span class="cstat-no" title="statement not covered" >    for await (const chunk of stream) {</span>
<span class="cstat-no" title="statement not covered" >      const content = chunk.content as string;</span>
<span class="cstat-no" title="statement not covered" >      chunks.push(content);</span>
<span class="cstat-no" title="statement not covered" >      yield content;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  } catch (error: any) {</span>
<span class="cstat-no" title="statement not covered" >    if (!config.models.shouldSwitchModel(error?.message || '')) {</span>
<span class="cstat-no" title="statement not covered" >      throw error;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
    // 流式无法完美重试（已部分yield），直接切换供应商
<span class="cstat-no" title="statement not covered" >    const nextModel = trySwitchModel(id, error);</span>
<span class="cstat-no" title="statement not covered" >    if (nextModel) {</span>
<span class="cstat-no" title="statement not covered" >      yield* callLLMStream(prompt, nextModel);</span>
<span class="cstat-no" title="statement not covered" >      return;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >    throw error;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 获取可用模型列表
 */
<span class="cstat-no" title="statement not covered" >export function getAvailableModels() {</span>
<span class="cstat-no" title="statement not covered" >  return config.models.getModelsByType('text');</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 清除模型缓存
 */
<span class="cstat-no" title="statement not covered" >export function clearModelCache() {</span>
<span class="cstat-no" title="statement not covered" >  modelCache.clear();</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ============ 供应商级别故障切换 ============
&nbsp;
/**
 * 检查错误是否需要切换供应商
 * 调度策略：同 Key 换模型无意义（额度共享），直接切换到下一个供应商
 * 优先查找同名/别名模型（canonicalModel），保持模型一致性
 */
<span class="cstat-no" title="statement not covered" >function trySwitchModel(currentModelId: string, error: any): string | null {</span>
<span class="cstat-no" title="statement not covered" >  const errorMessage = error?.message || '';</span>
<span class="cstat-no" title="statement not covered" >  const registry = getLlmRegistry();</span>
&nbsp;
  // 1. 额度耗尽检测：标记该供应商并切换（4小时自动恢复）
<span class="cstat-no" title="statement not covered" >  if (EXHAUSTED_PATTERNS.some(p =&gt; errorMessage.toLowerCase().includes(p))) {</span>
<span class="cstat-no" title="statement not covered" >    const currentNode = findProviderNodeForModel(currentModelId);</span>
<span class="cstat-no" title="statement not covered" >    if (currentNode) {</span>
      // 4小时 TTL 自动恢复
<span class="cstat-no" title="statement not covered" >      registry.markExhausted(currentNode.provider.name, errorMessage, 4 * 60 * 60 * 1000);</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 2. 熔断器开启，需切换供应商
<span class="cstat-no" title="statement not covered" >  if (error instanceof CircuitBreakerOpenError) {</span>
<span class="cstat-no" title="statement not covered" >    return switchToNextVendorModel(currentModelId);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 3. 可恢复错误，直接切换到下一个供应商
<span class="cstat-no" title="statement not covered" >  if (config.models.shouldSwitchModel(errorMessage)) {</span>
<span class="cstat-no" title="statement not covered" >    return switchToNextVendorModel(currentModelId);</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  return null;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 切换到下一个供应商（平等轮转，无优先级）
 * 优先查找同名/别名模型，保持输出一致性
 * 找不到同名模型时回退到该供应商的第一个文本模型
 */
<span class="cstat-no" title="statement not covered" >function switchToNextVendorModel(currentModelId: string): string | null {</span>
<span class="cstat-no" title="statement not covered" >  const registry = getLlmRegistry();</span>
<span class="cstat-no" title="statement not covered" >  const currentNode = findProviderNodeForModel(currentModelId);</span>
<span class="cstat-no" title="statement not covered" >  const available = registry.listAvailable();</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  if (available.length === 0) {</span>
<span class="cstat-no" title="statement not covered" >    console.warn('[LLM] 所有供应商都不可用（熔断/额度耗尽/禁用）');</span>
<span class="cstat-no" title="statement not covered" >    return null;</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
  // 从当前供应商的下一个开始找
<span class="cstat-no" title="statement not covered" >  const startIndex = currentNode</span>
<span class="cstat-no" title="statement not covered" >    ? (available.findIndex(n =&gt; n.provider.name === currentNode.provider.name) + 1) % available.length</span>
<span class="cstat-no" title="statement not covered" >    : 0;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  for (let i = 0; i &lt; available.length; i++) {</span>
<span class="cstat-no" title="statement not covered" >    const idx = (startIndex + i) % available.length;</span>
<span class="cstat-no" title="statement not covered" >    const node = available[idx];</span>
<span class="cstat-no" title="statement not covered" >    if (node === currentNode) continue;</span>
&nbsp;
    // 1. 精确匹配：下一个供应商是否也提供同名模型
<span class="cstat-no" title="statement not covered" >    if (node.provider.hasModel(currentModelId)) {</span>
<span class="cstat-no" title="statement not covered" >      console.log(`[LLM] 同模型切换到供应商 ${node.provider.displayName}，模型 ${currentModelId}`);</span>
<span class="cstat-no" title="statement not covered" >      return currentModelId;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
    // 2. 别名匹配：下一个供应商中是否有 canonicalModel 指向当前模型的
<span class="cstat-no" title="statement not covered" >    for (const modelId of node.provider.textModels) {</span>
<span class="cstat-no" title="statement not covered" >      const cfg = node.provider.getModelConfig(modelId);</span>
<span class="cstat-no" title="statement not covered" >      if (cfg?.canonicalModel === currentModelId) {</span>
<span class="cstat-no" title="statement not covered" >        console.log(`[LLM] 别名模型切换到供应商 ${node.provider.displayName}，模型 ${modelId}`);</span>
<span class="cstat-no" title="statement not covered" >        return modelId;</span>
<span class="cstat-no" title="statement not covered" >      }</span>
<span class="cstat-no" title="statement not covered" >    }</span>
&nbsp;
    // 3. 无同名/别名模型，使用该供应商的第一个文本模型
<span class="cstat-no" title="statement not covered" >    if (node.provider.textModels.length &gt; 0) {</span>
<span class="cstat-no" title="statement not covered" >      const nextId = node.provider.textModels[0];</span>
<span class="cstat-no" title="statement not covered" >      console.log(`[LLM] 切换到供应商 ${node.provider.displayName}，模型 ${nextId}`);</span>
<span class="cstat-no" title="statement not covered" >      return nextId;</span>
<span class="cstat-no" title="statement not covered" >    }</span>
<span class="cstat-no" title="statement not covered" >  }</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  console.warn('[LLM] 所有供应商都已不可用');</span>
<span class="cstat-no" title="statement not covered" >  return null;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ============ 初始化 ============
&nbsp;
// 模块加载时自动初始化并启动健康检查
<span class="cstat-no" title="statement not covered" >initLlmRegistry();</span>
<span class="cstat-no" title="statement not covered" >startHealthCheck();</span>
&nbsp;</pre></td></tr></table></pre>

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