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remote.ts
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import { Runnable, RunnableBatchOptions } from "./base.js";
import type { RunnableConfig } from "./config.js";
import { Document } from "../documents/index.js";
import { CallbackManagerForChainRun } from "../callbacks/manager.js";
import { ChatPromptValue, StringPromptValue } from "../prompt_values.js";
import {
LogStreamCallbackHandler,
RunLogPatch,
type LogStreamCallbackHandlerInput,
} from "../tracers/log_stream.js";
import {
AIMessage,
AIMessageChunk,
ChatMessage,
ChatMessageChunk,
FunctionMessage,
FunctionMessageChunk,
HumanMessage,
HumanMessageChunk,
SystemMessage,
SystemMessageChunk,
ToolMessage,
ToolMessageChunk,
isBaseMessage,
} from "../messages/index.js";
import { GenerationChunk, ChatGenerationChunk, RUN_KEY } from "../outputs.js";
import {
getBytes,
getLines,
getMessages,
convertEventStreamToIterableReadableDataStream,
} from "../utils/event_source_parse.js";
import { IterableReadableStream } from "../utils/stream.js";
type RemoteRunnableOptions = {
timeout?: number;
headers?: Record<string, unknown>;
};
function isSuperset(set: Set<string>, subset: Set<string>) {
for (const elem of subset) {
if (!set.has(elem)) {
return false;
}
}
return true;
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function revive(obj: any): any {
if (Array.isArray(obj)) return obj.map(revive);
if (typeof obj === "object") {
// eslint-disable-next-line no-instanceof/no-instanceof
if (!obj || obj instanceof Date) {
return obj;
}
const keysArr = Object.keys(obj);
const keys = new Set(keysArr);
if (isSuperset(keys, new Set(["page_content", "metadata"]))) {
return new Document({
pageContent: obj.page_content,
metadata: obj.metadata,
});
}
if (isSuperset(keys, new Set(["content", "type", "additional_kwargs"]))) {
if (obj.type === "HumanMessage" || obj.type === "human") {
return new HumanMessage({
content: obj.content,
});
}
if (obj.type === "SystemMessage" || obj.type === "system") {
return new SystemMessage({
content: obj.content,
});
}
if (obj.type === "ChatMessage" || obj.type === "chat") {
return new ChatMessage({
content: obj.content,
role: obj.role,
});
}
if (obj.type === "FunctionMessage" || obj.type === "function") {
return new FunctionMessage({
content: obj.content,
name: obj.name,
});
}
if (obj.type === "ToolMessage" || obj.type === "tool") {
return new ToolMessage({
content: obj.content,
tool_call_id: obj.tool_call_id,
});
}
if (obj.type === "AIMessage" || obj.type === "ai") {
return new AIMessage({
content: obj.content,
});
}
if (obj.type === "HumanMessageChunk") {
return new HumanMessageChunk({
content: obj.content,
});
}
if (obj.type === "SystemMessageChunk") {
return new SystemMessageChunk({
content: obj.content,
});
}
if (obj.type === "ChatMessageChunk") {
return new ChatMessageChunk({
content: obj.content,
role: obj.role,
});
}
if (obj.type === "FunctionMessageChunk") {
return new FunctionMessageChunk({
content: obj.content,
name: obj.name,
});
}
if (obj.type === "ToolMessageChunk") {
return new ToolMessageChunk({
content: obj.content,
tool_call_id: obj.tool_call_id,
});
}
if (obj.type === "AIMessageChunk") {
return new AIMessageChunk({
content: obj.content,
});
}
}
if (isSuperset(keys, new Set(["text", "generation_info", "type"]))) {
if (obj.type === "ChatGenerationChunk") {
return new ChatGenerationChunk({
message: revive(obj.message),
text: obj.text,
generationInfo: obj.generation_info,
});
} else if (obj.type === "ChatGeneration") {
return {
message: revive(obj.message),
text: obj.text,
generationInfo: obj.generation_info,
};
} else if (obj.type === "GenerationChunk") {
return new GenerationChunk({
text: obj.text,
generationInfo: obj.generation_info,
});
} else if (obj.type === "Generation") {
return {
text: obj.text,
generationInfo: obj.generation_info,
};
}
}
if (isSuperset(keys, new Set(["tool", "tool_input", "log", "type"]))) {
if (obj.type === "AgentAction") {
return {
tool: obj.tool,
toolInput: obj.tool_input,
log: obj.log,
};
}
}
if (isSuperset(keys, new Set(["return_values", "log", "type"]))) {
if (obj.type === "AgentFinish") {
return {
returnValues: obj.return_values,
log: obj.log,
};
}
}
if (isSuperset(keys, new Set(["generations", "run", "type"]))) {
if (obj.type === "LLMResult") {
return {
generations: revive(obj.generations),
llmOutput: obj.llm_output,
[RUN_KEY]: obj.run,
};
}
}
if (isSuperset(keys, new Set(["messages"]))) {
// TODO: Start checking for type: ChatPromptValue and ChatPromptValueConcrete
// when LangServe bug is fixed
return new ChatPromptValue({
// eslint-disable-next-line @typescript-eslint/no-explicit-any
messages: obj.messages.map((msg: any) => revive(msg)),
});
}
if (isSuperset(keys, new Set(["text"]))) {
// TODO: Start checking for type: StringPromptValue
// when LangServe bug is fixed
return new StringPromptValue(obj.text);
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const innerRevive: (key: string) => [string, any] = (key: string) => [
key,
revive(obj[key]),
];
const rtn = Object.fromEntries(keysArr.map(innerRevive));
return rtn;
}
return obj;
}
function deserialize<RunOutput>(str: string): RunOutput {
const obj = JSON.parse(str);
return revive(obj);
}
function removeCallbacks(
options?: RunnableConfig
): Omit<RunnableConfig, "callbacks"> {
const rest = { ...options };
delete rest.callbacks;
return rest;
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function serialize<RunInput>(input: RunInput): any {
if (Array.isArray(input)) return input.map(serialize);
if (isBaseMessage(input)) {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const serializedMessage: Record<string, any> = {
content: input.content,
type: input._getType(),
additional_kwargs: input.additional_kwargs,
name: input.name,
example: false,
};
if (ToolMessage.isInstance(input)) {
serializedMessage.tool_call_id = input.tool_call_id;
} else if (ChatMessage.isInstance(input)) {
serializedMessage.role = input.role;
}
return serializedMessage;
}
if (typeof input === "object") {
// eslint-disable-next-line no-instanceof/no-instanceof
if (!input || input instanceof Date) {
return input;
}
const keysArr = Object.keys(input);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
const innerSerialize: (key: string) => [string, any] = (key: string) => [
key,
serialize((input as Record<string, unknown>)[key]),
];
const rtn = Object.fromEntries(keysArr.map(innerSerialize));
return rtn;
}
return input;
}
export class RemoteRunnable<
RunInput,
RunOutput,
CallOptions extends RunnableConfig
> extends Runnable<RunInput, RunOutput, CallOptions> {
private url: string;
private options?: RemoteRunnableOptions;
lc_namespace = ["langchain", "schema", "runnable", "remote"];
constructor(fields: { url: string; options?: RemoteRunnableOptions }) {
super(fields);
const { url, options } = fields;
this.url = url.replace(/\/$/, ""); // remove trailing slash
this.options = options;
}
private async post<Body>(path: string, body: Body) {
return fetch(`${this.url}${path}`, {
method: "POST",
body: JSON.stringify(serialize(body)),
headers: {
"Content-Type": "application/json",
...this.options?.headers,
},
signal: AbortSignal.timeout(this.options?.timeout ?? 60000),
});
}
async invoke(
input: RunInput,
options?: Partial<CallOptions>
): Promise<RunOutput> {
const [config, kwargs] =
this._separateRunnableConfigFromCallOptions(options);
const response = await this.post<{
input: RunInput;
config?: RunnableConfig;
kwargs?: Omit<Partial<CallOptions>, keyof RunnableConfig>;
}>("/invoke", {
input,
config: removeCallbacks(config),
kwargs: kwargs ?? {},
});
return revive((await response.json()).output) as RunOutput;
}
async _batch(
inputs: RunInput[],
options?: Partial<CallOptions>[],
_?: (CallbackManagerForChainRun | undefined)[],
batchOptions?: RunnableBatchOptions
): Promise<(RunOutput | Error)[]> {
if (batchOptions?.returnExceptions) {
throw new Error("returnExceptions is not supported for remote clients");
}
const configsAndKwargsArray = options?.map((opts) =>
this._separateRunnableConfigFromCallOptions(opts)
);
const [configs, kwargs] = configsAndKwargsArray?.reduce(
([pc, pk], [c, k]) =>
[
[...pc, c],
[...pk, k],
] as [
RunnableConfig[],
Omit<Partial<CallOptions>, keyof RunnableConfig>[]
],
[[], []] as [
RunnableConfig[],
Omit<Partial<CallOptions>, keyof RunnableConfig>[]
]
) ?? [undefined, undefined];
const response = await this.post<{
inputs: RunInput[];
config?: (RunnableConfig & RunnableBatchOptions)[];
kwargs?: Omit<Partial<CallOptions>, keyof RunnableConfig>[];
}>("/batch", {
inputs,
config: (configs ?? [])
.map(removeCallbacks)
.map((config) => ({ ...config, ...batchOptions })),
kwargs,
});
const body = await response.json();
if (!body.output) throw new Error("Invalid response from remote runnable");
return revive(body.output);
}
async batch(
inputs: RunInput[],
options?: Partial<CallOptions> | Partial<CallOptions>[],
batchOptions?: RunnableBatchOptions & { returnExceptions?: false }
): Promise<RunOutput[]>;
async batch(
inputs: RunInput[],
options?: Partial<CallOptions> | Partial<CallOptions>[],
batchOptions?: RunnableBatchOptions & { returnExceptions: true }
): Promise<(RunOutput | Error)[]>;
async batch(
inputs: RunInput[],
options?: Partial<CallOptions> | Partial<CallOptions>[],
batchOptions?: RunnableBatchOptions
): Promise<(RunOutput | Error)[]>;
async batch(
inputs: RunInput[],
options?: Partial<CallOptions> | Partial<CallOptions>[],
batchOptions?: RunnableBatchOptions
): Promise<(RunOutput | Error)[]> {
if (batchOptions?.returnExceptions) {
throw Error("returnExceptions is not supported for remote clients");
}
return this._batchWithConfig(
this._batch.bind(this),
inputs,
options,
batchOptions
);
}
async stream(
input: RunInput,
options?: Partial<CallOptions>
): Promise<IterableReadableStream<RunOutput>> {
const [config, kwargs] =
this._separateRunnableConfigFromCallOptions(options);
const response = await this.post<{
input: RunInput;
config?: RunnableConfig;
kwargs?: Omit<Partial<CallOptions>, keyof RunnableConfig>;
}>("/stream", {
input,
config: removeCallbacks(config),
kwargs,
});
if (!response.ok) {
const json = await response.json();
const error = new Error(
`RemoteRunnable call failed with status code ${response.status}: ${json.message}`
);
// eslint-disable-next-line @typescript-eslint/no-explicit-any
(error as any).response = response;
throw error;
}
const { body } = response;
if (!body) {
throw new Error(
"Could not begin remote stream. Please check the given URL and try again."
);
}
const stream = new ReadableStream({
async start(controller) {
const enqueueLine = getMessages((msg) => {
if (msg.data) controller.enqueue(deserialize(msg.data));
});
const onLine = (
line: Uint8Array,
fieldLength: number,
flush?: boolean
) => {
enqueueLine(line, fieldLength, flush);
if (flush) controller.close();
};
await getBytes(body, getLines(onLine));
},
});
return IterableReadableStream.fromReadableStream(stream);
}
async *streamLog(
input: RunInput,
options?: Partial<CallOptions>,
streamOptions?: Omit<LogStreamCallbackHandlerInput, "autoClose">
): AsyncGenerator<RunLogPatch> {
const [config, kwargs] =
this._separateRunnableConfigFromCallOptions(options);
const stream = new LogStreamCallbackHandler({
...streamOptions,
autoClose: false,
});
const { callbacks } = config;
if (callbacks === undefined) {
config.callbacks = [stream];
} else if (Array.isArray(callbacks)) {
config.callbacks = callbacks.concat([stream]);
} else {
const copiedCallbacks = callbacks.copy();
copiedCallbacks.inheritableHandlers.push(stream);
config.callbacks = copiedCallbacks;
}
// The type is in camelCase but the API only accepts snake_case.
const camelCaseStreamOptions = {
include_names: streamOptions?.includeNames,
include_types: streamOptions?.includeTypes,
include_tags: streamOptions?.includeTags,
exclude_names: streamOptions?.excludeNames,
exclude_types: streamOptions?.excludeTypes,
exclude_tags: streamOptions?.excludeTags,
};
const response = await this.post<{
input: RunInput;
config?: RunnableConfig;
kwargs?: Omit<Partial<CallOptions>, keyof RunnableConfig>;
diff: false;
}>("/stream_log", {
input,
config: removeCallbacks(config),
kwargs,
...camelCaseStreamOptions,
diff: false,
});
const { body } = response;
if (!body) {
throw new Error(
"Could not begin remote stream log. Please check the given URL and try again."
);
}
const runnableStream = convertEventStreamToIterableReadableDataStream(body);
for await (const log of runnableStream) {
const chunk = revive(JSON.parse(log));
yield new RunLogPatch({ ops: chunk.ops });
}
}
}