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feat(Custom n8n Workflow Tool Node): Add support for tool input schema (#9470)

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Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
This commit is contained in:
oleg
2024-05-22 14:29:32 +02:00
committed by GitHub
parent ef9d4aba90
commit 2fa46b6faa
14 changed files with 373 additions and 108 deletions
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155
packages/@n8n/nodes-langchain/nodes/tools/ToolWorkflow/ToolWorkflow.node.ts
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@@ -9,16 +9,23 @@ import type {
ExecutionError,
IDataObject,
} from 'n8n-workflow';
import { NodeConnectionType, NodeOperationError } from 'n8n-workflow';
import { NodeConnectionType, NodeOperationError, jsonParse } from 'n8n-workflow';
import type { SetField, SetNodeOptions } from 'n8n-nodes-base/dist/nodes/Set/v2/helpers/interfaces';
import * as manual from 'n8n-nodes-base/dist/nodes/Set/v2/manual.mode';
import { DynamicTool } from '@langchain/core/tools';
import { DynamicStructuredTool, DynamicTool } from '@langchain/core/tools';
import get from 'lodash/get';
import isObject from 'lodash/isObject';
import type { CallbackManagerForToolRun } from '@langchain/core/callbacks/manager';
import type { JSONSchema7 } from 'json-schema';
import { getConnectionHintNoticeField } from '../../../utils/sharedFields';
import type { DynamicZodObject } from '../../../types/zod.types';
import { generateSchema, getSandboxWithZod } from '../../../utils/schemaParsing';
import {
jsonSchemaExampleField,
schemaTypeField,
inputSchemaField,
} from '../../../utils/descriptions';
export class ToolWorkflow implements INodeType {
description: INodeTypeDescription = {
displayName: 'Custom n8n Workflow Tool',
@@ -314,6 +321,21 @@ export class ToolWorkflow implements INodeType {
},
],
},
// ----------------------------------
// Output Parsing
// ----------------------------------
{
displayName: 'Specify Input Schema',
name: 'specifyInputSchema',
type: 'boolean',
description:
'Whether to specify the schema for the function. This would require the LLM to provide the input in the correct format and would validate it against the schema.',
noDataExpression: true,
default: false,
},
{ ...schemaTypeField, displayOptions: { show: { specifyInputSchema: [true] } } },
jsonSchemaExampleField,
inputSchemaField,
],
};
@@ -321,8 +343,11 @@ export class ToolWorkflow implements INodeType {
const name = this.getNodeParameter('name', itemIndex) as string;
const description = this.getNodeParameter('description', itemIndex) as string;
const useSchema = this.getNodeParameter('specifyInputSchema', itemIndex) as boolean;
let tool: DynamicTool | DynamicStructuredTool | undefined = undefined;
const runFunction = async (
query: string,
query: string | IDataObject,
runManager?: CallbackManagerForToolRun,
): Promise<string> => {
const source = this.getNodeParameter('source', itemIndex) as string;
@@ -416,50 +441,86 @@ export class ToolWorkflow implements INodeType {
return response;
};
const toolHandler = async (
query: string | IDataObject,
runManager?: CallbackManagerForToolRun,
): Promise<string> => {
const { index } = this.addInputData(NodeConnectionType.AiTool, [[{ json: { query } }]]);
let response: string = '';
let executionError: ExecutionError | undefined;
try {
response = await runFunction(query, runManager);
} catch (error) {
// TODO: Do some more testing. Issues here should actually fail the workflow
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
executionError = error;
// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
response = `There was an error: "${error.message}"`;
}
if (typeof response === 'number') {
response = (response as number).toString();
}
if (isObject(response)) {
response = JSON.stringify(response, null, 2);
}
if (typeof response !== 'string') {
// TODO: Do some more testing. Issues here should actually fail the workflow
executionError = new NodeOperationError(this.getNode(), 'Wrong output type returned', {
description: `The response property should be a string, but it is an ${typeof response}`,
});
response = `There was an error: "${executionError.message}"`;
}
if (executionError) {
void this.addOutputData(NodeConnectionType.AiTool, index, executionError);
} else {
void this.addOutputData(NodeConnectionType.AiTool, index, [[{ json: { response } }]]);
}
return response;
};
const functionBase = {
name,
description,
func: toolHandler,
};
if (useSchema) {
try {
// We initialize these even though one of them will always be empty
// it makes it easer to navigate the ternary operator
const jsonExample = this.getNodeParameter('jsonSchemaExample', itemIndex, '') as string;
const inputSchema = this.getNodeParameter('inputSchema', itemIndex, '') as string;
const schemaType = this.getNodeParameter('schemaType', itemIndex) as 'fromJson' | 'manual';
const jsonSchema =
schemaType === 'fromJson'
? generateSchema(jsonExample)
: jsonParse<JSONSchema7>(inputSchema);
const zodSchemaSandbox = getSandboxWithZod(this, jsonSchema, 0);
const zodSchema = (await zodSchemaSandbox.runCode()) as DynamicZodObject;
tool = new DynamicStructuredTool<typeof zodSchema>({
schema: zodSchema,
...functionBase,
});
} catch (error) {
throw new NodeOperationError(
this.getNode(),
'Error during parsing of JSON Schema. \n ' + error,
);
}
} else {
tool = new DynamicTool(functionBase);
}
return {
response: new DynamicTool({
name,
description,
func: async (query: string, runManager?: CallbackManagerForToolRun): Promise<string> => {
const { index } = this.addInputData(NodeConnectionType.AiTool, [[{ json: { query } }]]);
let response: string = '';
let executionError: ExecutionError | undefined;
try {
response = await runFunction(query, runManager);
} catch (error) {
// TODO: Do some more testing. Issues here should actually fail the workflow
// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
executionError = error;
// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
response = `There was an error: "${error.message}"`;
}
if (typeof response === 'number') {
response = (response as number).toString();
}
if (isObject(response)) {
response = JSON.stringify(response, null, 2);
}
if (typeof response !== 'string') {
// TODO: Do some more testing. Issues here should actually fail the workflow
executionError = new NodeOperationError(this.getNode(), 'Wrong output type returned', {
description: `The response property should be a string, but it is an ${typeof response}`,
});
response = `There was an error: "${executionError.message}"`;
}
if (executionError) {
void this.addOutputData(NodeConnectionType.AiTool, index, executionError);
} else {
void this.addOutputData(NodeConnectionType.AiTool, index, [[{ json: { response } }]]);
}
return response;
},
}),
response: tool,
};
}
}