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This is the wire protocol spoken by the\n * Radius gateway, but any backend implementing it can be used, e.g. via a\n * models.json custom provider with `\"api\": \"pi-messages\"`.\n */\n\nimport type {\n\tAssistantMessage,\n\tAssistantMessageEvent,\n\tCacheRetention,\n\tContext,\n\tModel,\n\tProviderEnv,\n\tSimpleStreamOptions,\n\tStreamFunction,\n\tStreamOptions,\n\tThinkingLevel,\n\tToolCall,\n} from \"../types.ts\";\nimport { appendAssistantMessageDiagnostic, createAssistantMessageDiagnostic } from \"../utils/diagnostics.ts\";\nimport { AssistantMessageEventStream } from \"../utils/event-stream.ts\";\nimport { headersToRecord, providerHeadersToRecord } from \"../utils/headers.ts\";\nimport { parseStreamingJson } from \"../utils/json-parse.ts\";\nimport { getProviderEnvValue } from \"../utils/provider-env.ts\";\n\nexport interface PiMessagesOptions extends StreamOptions {\n\treasoning?: ThinkingLevel;\n\ttoolChoice?: \"auto\" | \"none\" | \"required\" | { type: \"function\"; function: { name: string } };\n\t/** Ask the backend for debug metadata (e.g. routing response headers). */\n\tdebug?: boolean;\n}\n\ntype PiMessagesUsage = AssistantMessage[\"usage\"];\ntype PiMessagesStopReason = AssistantMessage[\"stopReason\"];\n\n/** Impact summary of a server-side message rewrite (e.g. a gateway policy). */\nexport type PiMessagesRewriteImpact = {\n\tpolicyId: string;\n\tpolicyVersion: number;\n\tchanged: boolean;\n\ttokenCountChange: number;\n\tmessageCountChange: number;\n\tsystemPromptChanged: boolean;\n};\n\n/** Serialized assistant-message event as sent by a pi-messages backend. */\nexport type PiMessagesEvent =\n\t| { type: \"start\" }\n\t| { type: \"text_start\"; contentIndex: number }\n\t| { type: \"text_delta\"; contentIndex: number; delta: string }\n\t| { type: \"text_end\"; contentIndex: number; content: string; contentSignature?: string }\n\t| { type: \"thinking_start\"; contentIndex: number }\n\t| { type: \"thinking_delta\"; contentIndex: number; delta: string }\n\t| {\n\t\t\ttype: \"thinking_end\";\n\t\t\tcontentIndex: number;\n\t\t\tcontent: string;\n\t\t\tcontentSignature?: string;\n\t\t\tredacted?: boolean;\n\t  }\n\t| { type: \"toolcall_start\"; contentIndex: number; id: string; toolName: string }\n\t| { type: \"toolcall_delta\"; contentIndex: number; delta: string }\n\t| { type: \"toolcall_end\"; contentIndex: number; toolCall: ToolCall }\n\t| {\n\t\t\ttype: \"done\";\n\t\t\treason: Extract<PiMessagesStopReason, \"stop\" | \"length\" | \"toolUse\">;\n\t\t\tusage: PiMessagesUsage;\n\t\t\tresponseId?: string;\n\t\t\trewrite?: PiMessagesRewriteImpact;\n\t  }\n\t| {\n\t\t\ttype: \"error\";\n\t\t\treason: Extract<PiMessagesStopReason, \"aborted\" | \"error\">;\n\t\t\tusage: PiMessagesUsage;\n\t\t\terrorMessage?: string;\n\t\t\tresponseId?: string;\n\t\t\trewrite?: PiMessagesRewriteImpact;\n\t  };\n\ntype PiMessagesErrorBody = {\n\terror?: {\n\t\tmessage?: unknown;\n\t\tcode?: unknown;\n\t\tdetails?: unknown;\n\t\t[key: string]: unknown;\n\t};\n};\n\nexport class PiMessagesResponseError extends Error {\n\tcode?: string;\n\treadonly diagnosticDetails: Record<string, unknown>;\n\n\tconstructor(message: string, code: string | undefined, diagnosticDetails: Record<string, unknown>) {\n\t\tsuper(message);\n\t\tthis.name = \"PiMessagesResponseError\";\n\t\tthis.code = code;\n\t\tthis.diagnosticDetails = diagnosticDetails;\n\t}\n}\n\nfunction parsePiMessagesErrorBody(body: string): PiMessagesErrorBody | undefined {\n\ttry {\n\t\tconst parsed = JSON.parse(body) as PiMessagesErrorBody | null;\n\t\tconst error = parsed?.error;\n\t\treturn parsed && typeof error === \"object\" && error !== null && !Array.isArray(error) ? parsed : undefined;\n\t} catch {\n\t\treturn undefined;\n\t}\n}\n\nfunction truncateDiagnosticString(value: string): string {\n\tconst maxLength = 8192;\n\treturn value.length > maxLength ? `${value.slice(0, maxLength)}…` : value;\n}\n\nfunction formatPiMessagesResponseError(\n\tresponse: Response,\n\tbody: string,\n\terrorBody: PiMessagesErrorBody | undefined,\n): string {\n\tconst message = typeof errorBody?.error?.message === \"string\" ? errorBody.error.message : undefined;\n\tconst code = typeof errorBody?.error?.code === \"string\" ? errorBody.error.code : undefined;\n\tconst suffix = message ?? body;\n\tconst codeSuffix = code ? ` (${code})` : \"\";\n\treturn `${response.status} ${response.statusText}: ${suffix}${codeSuffix}`;\n}\n\nfunction createPiMessagesResponseError(\n\tmodel: Model<\"pi-messages\">,\n\turl: URL,\n\tresponse: Response,\n\tbody: string,\n): PiMessagesResponseError {\n\tconst errorBody = parsePiMessagesErrorBody(body);\n\tconst code = typeof errorBody?.error?.code === \"string\" ? errorBody.error.code : undefined;\n\treturn new PiMessagesResponseError(formatPiMessagesResponseError(response, body, errorBody), code, {\n\t\tversion: 1,\n\t\tprovider: model.provider,\n\t\tmodel: model.id,\n\t\turl: url.toString(),\n\t\tstatus: response.status,\n\t\tstatusText: response.statusText,\n\t\terror: errorBody?.error,\n\t\tbody: errorBody ? undefined : truncateDiagnosticString(body),\n\t\ttimestampMs: Date.now(),\n\t});\n}\n\nfunction createEmptyUsage(): PiMessagesUsage {\n\treturn {\n\t\tinput: 0,\n\t\toutput: 0,\n\t\tcacheRead: 0,\n\t\tcacheWrite: 0,\n\t\ttotalTokens: 0,\n\t\tcost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },\n\t};\n}\n\nfunction appendRewriteDiagnostic(message: AssistantMessage, rewrite: PiMessagesRewriteImpact | undefined): void {\n\tif (!rewrite) {\n\t\treturn;\n\t}\n\tappendAssistantMessageDiagnostic(message, {\n\t\ttype: \"pi_messages_rewrite\",\n\t\ttimestamp: Date.now(),\n\t\tdetails: { ...rewrite },\n\t});\n}\n\nfunction createEventConverter(model: Model<\"pi-messages\">) {\n\tconst partial: AssistantMessage = {\n\t\trole: \"assistant\",\n\t\tcontent: [],\n\t\tapi: model.api,\n\t\tprovider: model.provider,\n\t\tmodel: model.id,\n\t\tusage: createEmptyUsage(),\n\t\tstopReason: \"pending\",\n\t\ttimestamp: Date.now(),\n\t};\n\tconst toolJson = new Map<number, string>();\n\n\treturn (event: PiMessagesEvent): AssistantMessageEvent => {\n\t\tswitch (event.type) {\n\t\t\tcase \"done\":\n\t\t\t\tObject.assign(partial, {\n\t\t\t\t\tstopReason: event.reason,\n\t\t\t\t\tusage: event.usage,\n\t\t\t\t\tresponseId: event.responseId,\n\t\t\t\t});\n\t\t\t\tappendRewriteDiagnostic(partial, event.rewrite);\n\t\t\t\treturn { type: \"done\", reason: event.reason, message: partial };\n\t\t\tcase \"error\":\n\t\t\t\tObject.assign(partial, {\n\t\t\t\t\tstopReason: event.reason,\n\t\t\t\t\tusage: event.usage,\n\t\t\t\t\terrorMessage: event.errorMessage,\n\t\t\t\t\tresponseId: event.responseId,\n\t\t\t\t});\n\t\t\t\tappendRewriteDiagnostic(partial, event.rewrite);\n\t\t\t\treturn { type: \"error\", reason: event.reason, error: partial };\n\t\t\tcase \"start\":\n\t\t\t\tbreak;\n\t\t\tcase \"text_start\":\n\t\t\t\tpartial.content[event.contentIndex] = { type: \"text\", text: \"\" };\n\t\t\t\tbreak;\n\t\t\tcase \"text_delta\":\n\t\t\t\t(partial.content[event.contentIndex] as { text: string }).text += event.delta;\n\t\t\t\tbreak;\n\t\t\tcase \"text_end\":\n\t\t\t\tObject.assign(partial.content[event.contentIndex]!, {\n\t\t\t\t\ttext: event.content,\n\t\t\t\t\ttextSignature: event.contentSignature,\n\t\t\t\t});\n\t\t\t\tbreak;\n\t\t\tcase \"thinking_start\":\n\t\t\t\tpartial.content[event.contentIndex] = { type: \"thinking\", thinking: \"\" };\n\t\t\t\tbreak;\n\t\t\tcase \"thinking_delta\":\n\t\t\t\t(partial.content[event.contentIndex] as { thinking: string }).thinking += event.delta;\n\t\t\t\tbreak;\n\t\t\tcase \"thinking_end\":\n\t\t\t\tObject.assign(partial.content[event.contentIndex]!, {\n\t\t\t\t\tthinking: event.content,\n\t\t\t\t\tthinkingSignature: event.contentSignature,\n\t\t\t\t\tredacted: event.redacted,\n\t\t\t\t});\n\t\t\t\tbreak;\n\t\t\tcase \"toolcall_start\":\n\t\t\t\tpartial.content[event.contentIndex] = {\n\t\t\t\t\ttype: \"toolCall\",\n\t\t\t\t\tid: event.id,\n\t\t\t\t\tname: event.toolName,\n\t\t\t\t\targuments: {},\n\t\t\t\t};\n\t\t\t\ttoolJson.set(event.contentIndex, \"\");\n\t\t\t\tbreak;\n\t\t\tcase \"toolcall_delta\": {\n\t\t\t\tconst json = `${toolJson.get(event.contentIndex) ?? \"\"}${event.delta}`;\n\t\t\t\ttoolJson.set(event.contentIndex, json);\n\t\t\t\t(partial.content[event.contentIndex] as ToolCall).arguments =\n\t\t\t\t\tparseStreamingJson<ToolCall[\"arguments\"]>(json);\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase \"toolcall_end\":\n\t\t\t\tObject.assign(partial.content[event.contentIndex]!, event.toolCall);\n\t\t\t\ttoolJson.delete(event.contentIndex);\n\t\t\t\treturn {\n\t\t\t\t\ttype: \"toolcall_end\",\n\t\t\t\t\tcontentIndex: event.contentIndex,\n\t\t\t\t\ttoolCall: partial.content[event.contentIndex] as ToolCall,\n\t\t\t\t\tpartial,\n\t\t\t\t};\n\t\t}\n\n\t\treturn { ...event, partial } as AssistantMessageEvent;\n\t};\n}\n\nasync function* readPiMessagesEvents(stream: ReadableStream<Uint8Array>): AsyncGenerator<PiMessagesEvent> {\n\tconst decoder = new TextDecoder();\n\tconst reader = stream.getReader();\n\tlet buffer = \"\";\n\n\ttry {\n\t\twhile (true) {\n\t\t\tconst { done, value } = await reader.read();\n\t\t\tbuffer += done ? decoder.decode() : decoder.decode(value, { stream: true });\n\t\t\tbuffer = buffer.replace(/\\r\\n/g, \"\\n\");\n\n\t\t\tlet split = buffer.indexOf(\"\\n\\n\");\n\t\t\twhile (split !== -1) {\n\t\t\t\tconst event = parsePiMessagesEvent(buffer.slice(0, split));\n\t\t\t\tif (event) {\n\t\t\t\t\tyield event;\n\t\t\t\t}\n\t\t\t\tbuffer = buffer.slice(split + 2);\n\t\t\t\tsplit = buffer.indexOf(\"\\n\\n\");\n\t\t\t}\n\n\t\t\tif (done) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\tif (buffer.trim()) {\n\t\t\tconst event = parsePiMessagesEvent(buffer);\n\t\t\tif (event) {\n\t\t\t\tyield event;\n\t\t\t}\n\t\t}\n\t} finally {\n\t\treader.releaseLock();\n\t}\n}\n\nfunction parsePiMessagesEvent(raw: string): PiMessagesEvent | undefined {\n\tconst data = raw\n\t\t.split(\"\\n\")\n\t\t.find((line) => line.startsWith(\"data:\"))\n\t\t?.slice(5)\n\t\t.trim();\n\n\treturn data && data !== \"[DONE]\" ? (JSON.parse(data) as PiMessagesEvent) : undefined;\n}\n\nfunction createErrorEvent(model: Model<\"pi-messages\">, error: unknown, aborted: boolean): AssistantMessageEvent {\n\tconst reason = aborted ? \"aborted\" : \"error\";\n\tconst assistantMessage: AssistantMessage = {\n\t\trole: \"assistant\",\n\t\tcontent: [],\n\t\tapi: model.api,\n\t\tprovider: model.provider,\n\t\tmodel: model.id,\n\t\tusage: createEmptyUsage(),\n\t\tstopReason: reason,\n\t\terrorMessage: error instanceof Error ? error.message : String(error),\n\t\ttimestamp: Date.now(),\n\t};\n\n\tif (!aborted && error instanceof PiMessagesResponseError) {\n\t\tappendAssistantMessageDiagnostic(\n\t\t\tassistantMessage,\n\t\t\tcreateAssistantMessageDiagnostic(\"pi_messages_response_failure\", error, error.diagnosticDetails),\n\t\t);\n\t}\n\n\treturn { type: \"error\", reason, error: assistantMessage };\n}\n\nfunction resolveCacheRetention(cacheRetention?: CacheRetention, env?: ProviderEnv): CacheRetention | undefined {\n\tif (cacheRetention) {\n\t\treturn cacheRetention;\n\t}\n\t// Backend defaults apply when unset; only the legacy env opt-in is mapped.\n\treturn getProviderEnvValue(\"PI_CACHE_RETENTION\", env) === \"long\" ? \"long\" : undefined;\n}\n\nexport const stream: StreamFunction<\"pi-messages\", PiMessagesOptions> = (\n\tmodel: Model<\"pi-messages\">,\n\tcontext: Context,\n\toptions?: PiMessagesOptions,\n): AssistantMessageEventStream => {\n\tconst eventStream = new AssistantMessageEventStream();\n\tconst convertEvent = createEventConverter(model);\n\n\tvoid (async () => {\n\t\ttry {\n\t\t\tconst apiKey = options?.apiKey;\n\t\t\tif (!apiKey) {\n\t\t\t\tthrow new Error(`No API key provided for provider \"${model.provider}\"`);\n\t\t\t}\n\n\t\t\tconst url = new URL(`${model.baseUrl.replace(/\\/+$/u, \"\")}/messages`);\n\t\t\tif (options?.debug) {\n\t\t\t\turl.searchParams.set(\"debug\", \"1\");\n\t\t\t}\n\n\t\t\tlet payload: unknown = {\n\t\t\t\tmodel: model.id,\n\t\t\t\tcontext,\n\t\t\t\toptions: {\n\t\t\t\t\ttemperature: options?.temperature,\n\t\t\t\t\tmaxTokens: options?.maxTokens,\n\t\t\t\t\treasoning: options?.reasoning,\n\t\t\t\t\tcacheRetention: resolveCacheRetention(options?.cacheRetention, options?.env),\n\t\t\t\t\tsessionId: options?.sessionId,\n\t\t\t\t\ttoolChoice: options?.toolChoice,\n\t\t\t\t},\n\t\t\t};\n\t\t\tconst nextPayload = await options?.onPayload?.(payload, model);\n\t\t\tif (nextPayload !== undefined) {\n\t\t\t\tpayload = nextPayload;\n\t\t\t}\n\n\t\t\tconst response = await (options?.fetch ?? globalThis.fetch)(url, {\n\t\t\t\tmethod: \"POST\",\n\t\t\t\theaders: {\n\t\t\t\t\tauthorization: `Bearer ${apiKey}`,\n\t\t\t\t\taccept: \"text/event-stream\",\n\t\t\t\t\t\"content-type\": \"application/json\",\n\t\t\t\t\t...providerHeadersToRecord(options?.headers),\n\t\t\t\t},\n\t\t\t\tbody: JSON.stringify(payload),\n\t\t\t\tsignal: options?.signal,\n\t\t\t});\n\n\t\t\tawait options?.onResponse?.({ status: response.status, headers: headersToRecord(response.headers) }, model);\n\n\t\t\tif (!response.ok) {\n\t\t\t\tconst body = await response.text();\n\t\t\t\tthrow createPiMessagesResponseError(model, url, response, body);\n\t\t\t}\n\t\t\tif (!response.body) {\n\t\t\t\tthrow new Error(`${model.provider} response has no body`);\n\t\t\t}\n\n\t\t\tfor await (const piEvent of readPiMessagesEvents(response.body)) {\n\t\t\t\tconst event = convertEvent(piEvent);\n\t\t\t\teventStream.push(event);\n\t\t\t\tif (event.type === \"done\" || event.type === \"error\") {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthrow new Error(`${model.provider} stream ended without a terminal event`);\n\t\t} catch (error) {\n\t\t\teventStream.push(createErrorEvent(model, error, options?.signal?.aborted ?? false));\n\t\t}\n\t})();\n\n\treturn eventStream;\n};\n\nexport const streamSimple: StreamFunction<\"pi-messages\", SimpleStreamOptions> = (\n\tmodel: Model<\"pi-messages\">,\n\tcontext: Context,\n\toptions?: SimpleStreamOptions,\n): AssistantMessageEventStream => {\n\tconst extra = options as PiMessagesOptions | undefined;\n\treturn stream(model, context, {\n\t\t...options,\n\t\treasoning: options?.reasoning,\n\t\ttoolChoice: extra?.toolChoice,\n\t\tdebug: extra?.debug,\n\t});\n};\n"]}