@genkit-ai/core
Version:
Genkit AI framework core libraries.
265 lines • 8.32 kB
JavaScript
import { getAsyncContext } from "./async-context.js";
import { lazy } from "./async.js";
import { getContext, runWithContext } from "./context.js";
import { parseSchema } from "./schema.js";
import {
SPAN_TYPE_ATTR,
runInNewSpan,
setCustomMetadataAttributes
} from "./tracing.js";
import { StatusCodes, StatusSchema } from "./statusTypes.js";
import { InMemoryStreamManager, StreamNotFoundError } from "./streaming.js";
const makeNoopAbortSignal = () => new AbortController().signal;
function actionWithMiddleware(action2, middleware) {
const wrapped = async (req, options) => {
return (await wrapped.run(req, options)).result;
};
wrapped.__action = action2.__action;
wrapped.run = async (req, options) => {
let telemetry;
const dispatch = async (index, req2, opts) => {
if (index === middleware.length) {
const result = await action2.run(req2, opts);
telemetry = result.telemetry;
return result.result;
}
const currentMiddleware = middleware[index];
if (currentMiddleware.length === 3) {
return currentMiddleware(
req2,
opts,
async (modifiedReq, modifiedOptions) => dispatch(index + 1, modifiedReq || req2, modifiedOptions || opts)
);
} else if (currentMiddleware.length === 2) {
return currentMiddleware(
req2,
async (modifiedReq) => dispatch(index + 1, modifiedReq || req2, opts)
);
} else {
throw new Error("unspported middleware function shape");
}
};
wrapped.stream = action2.stream;
return { result: await dispatch(0, req, options), telemetry };
};
return wrapped;
}
function action(config, fn) {
const actionName = typeof config.name === "string" ? config.name : `${config.name.pluginId}/${config.name.actionId}`;
const actionMetadata = {
name: actionName,
description: config.description,
inputSchema: config.inputSchema,
inputJsonSchema: config.inputJsonSchema,
outputSchema: config.outputSchema,
outputJsonSchema: config.outputJsonSchema,
streamSchema: config.streamSchema,
metadata: config.metadata,
actionType: config.actionType
};
const actionFn = async (input, options) => {
return (await actionFn.run(input, options)).result;
};
actionFn.__action = { ...actionMetadata };
actionFn.run = async (input, options) => {
input = parseSchema(input, {
schema: config.inputSchema,
jsonSchema: config.inputJsonSchema
});
let traceId;
let spanId;
let output = await runInNewSpan(
{
metadata: {
name: actionName
},
labels: {
[SPAN_TYPE_ATTR]: "action",
"genkit:metadata:subtype": config.actionType,
...options?.telemetryLabels
}
},
async (metadata, span) => {
setCustomMetadataAttributes({
subtype: config.actionType
});
if (options?.context) {
setCustomMetadataAttributes({
context: JSON.stringify(options.context)
});
}
traceId = span.spanContext().traceId;
spanId = span.spanContext().spanId;
if (options?.onTraceStart) {
options.onTraceStart({ traceId, spanId });
}
metadata.name = actionName;
metadata.input = input;
try {
const actFn = () => fn(input, {
...options,
// Context can either be explicitly set, or inherited from the parent action.
context: {
...actionFn.__registry?.context,
...options?.context ?? getContext()
},
streamingRequested: !!options?.onChunk && options.onChunk !== sentinelNoopStreamingCallback,
sendChunk: options?.onChunk ?? sentinelNoopStreamingCallback,
trace: {
traceId,
spanId
},
registry: actionFn.__registry,
abortSignal: options?.abortSignal ?? makeNoopAbortSignal()
});
const output2 = await runWithContext(options?.context, actFn);
metadata.output = JSON.stringify(output2);
return output2;
} catch (err) {
if (typeof err === "object") {
err.traceId = traceId;
}
throw err;
}
}
);
output = parseSchema(output, {
schema: config.outputSchema,
jsonSchema: config.outputJsonSchema
});
return {
result: output,
telemetry: {
traceId,
spanId
}
};
};
actionFn.stream = (input, opts) => {
let chunkStreamController;
const chunkStream = new ReadableStream({
start(controller) {
chunkStreamController = controller;
},
pull() {
},
cancel() {
}
});
const invocationPromise = actionFn.run(config.inputSchema ? config.inputSchema.parse(input) : input, {
onChunk: (chunk) => {
chunkStreamController.enqueue(chunk);
},
context: {
...actionFn.__registry?.context,
...opts?.context ?? getContext()
},
abortSignal: opts?.abortSignal,
telemetryLabels: opts?.telemetryLabels
}).then((s) => s.result).finally(() => {
chunkStreamController.close();
});
return {
output: invocationPromise,
stream: async function* () {
const reader = chunkStream.getReader();
while (true) {
const chunk = await reader.read();
if (chunk.value) {
yield chunk.value;
}
if (chunk.done) {
break;
}
}
return await invocationPromise;
}()
};
};
if (config.use) {
return actionWithMiddleware(actionFn, config.use);
}
return actionFn;
}
function isAction(a) {
return typeof a === "function" && "__action" in a;
}
function defineAction(registry, config, fn) {
if (isInRuntimeContext()) {
throw new Error(
"Cannot define new actions at runtime.\nSee: https://github.com/firebase/genkit/blob/main/docs/errors/no_new_actions_at_runtime.md"
);
}
const act = action(config, async (i, options) => {
await registry.initializeAllPlugins();
return await runInActionRuntimeContext(() => fn(i, options));
});
act.__action.actionType = config.actionType;
registry.registerAction(config.actionType, act);
return act;
}
function defineActionAsync(registry, actionType, name, config, onInit) {
const actionName = typeof name === "string" ? name : `${name.pluginId}/${name.actionId}`;
const actionPromise = lazy(
() => config.then((resolvedConfig) => {
const act = action(
resolvedConfig,
async (i, options) => {
await registry.initializeAllPlugins();
return await runInActionRuntimeContext(
() => resolvedConfig.fn(i, options)
);
}
);
act.__action.actionType = actionType;
onInit?.(act);
return act;
})
);
registry.registerActionAsync(actionType, actionName, actionPromise);
return actionPromise;
}
const streamingAlsKey = "core.action.streamingCallback";
const sentinelNoopStreamingCallback = () => null;
function runWithStreamingCallback(streamingCallback, fn) {
return getAsyncContext().run(
streamingAlsKey,
streamingCallback || sentinelNoopStreamingCallback,
fn
);
}
function getStreamingCallback() {
const cb = getAsyncContext().getStore(streamingAlsKey);
if (cb === sentinelNoopStreamingCallback) {
return void 0;
}
return cb;
}
const runtimeContextAslKey = "core.action.runtimeContext";
function isInRuntimeContext() {
return getAsyncContext().getStore(runtimeContextAslKey) === "runtime";
}
function runInActionRuntimeContext(fn) {
return getAsyncContext().run(runtimeContextAslKey, "runtime", fn);
}
function runOutsideActionRuntimeContext(fn) {
return getAsyncContext().run(runtimeContextAslKey, "outside", fn);
}
export {
InMemoryStreamManager,
StatusCodes,
StatusSchema,
StreamNotFoundError,
action,
actionWithMiddleware,
defineAction,
defineActionAsync,
getStreamingCallback,
isAction,
isInRuntimeContext,
runInActionRuntimeContext,
runOutsideActionRuntimeContext,
runWithStreamingCallback,
sentinelNoopStreamingCallback
};
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