@samchon/openapi

@samchon/openapi

flowchart
  subgraph "OpenAPI Specification"
    v20("Swagger v2.0") --upgrades--> emended[["OpenAPI v3.1 (emended)"]]
    v30("OpenAPI v3.0") --upgrades--> emended
    v31("OpenAPI v3.1") --emends--> emended
  end
  subgraph "Ecosystem"
    emended --normalizes--> migration[["Migration Schema"]]
    migration --"Artificial Intelligence"--> lfc{{"LLM Function Calling Application"}}
  end

OpenAPI definitions, converters and utillity functions.

@samchon/openapi is a collection of OpenAPI types for every versions, and converters for them. In the OpenAPI types, there is an "emended" OpenAPI v3.1 specification, which has removed ambiguous and duplicated expressions for the clarity. Every conversions are based on the emended OpenAPI v3.1 specification.

1. Swagger v2.0
2. OpenAPI v3.0
3. OpenAPI v3.1
4. OpenAPI v3.1 emended

@samchon/openapi also provides LLM (Large Language Model) function calling application composer from the OpenAPI document with many strategies. With the HttpLlm module, you can perform the LLM funtion calling extremely easily just by delivering the OpenAPI (Swagger) document.

• HttpLlm.application()
• IHttpLlmApplication
• IHttpLlmFunction
• ILlmSchema
• LlmTypeChecker

[!TIP]

LLM selects proper function and fill arguments.

In nowadays, most LLM (Large Language Model) like OpenAI are supporting "function calling" feature. The "LLM function calling" means that LLM automatically selects a proper function and fills parameter values from conversation with the user (may by chatting text).

https://platform.openai.com/docs/guides/function-calling

Setup

npm install @samchon/openapi

Just install by npm i @samchon/openapi command.

Here is an example code utilizing the @samchon/openapi for LLM function calling purpose.

import {
  HttpLlm,
  IHttpLlmApplication,
  IHttpLlmFunction,
  OpenApi,
  OpenApiV3,
  OpenApiV3_1,
  SwaggerV2,
} from "@samchon/openapi";
import fs from "fs";
import typia from "typia";

const main = async (): Promise<void> => {
  // read swagger document and validate it
  const swagger:
    | SwaggerV2.IDocument
    | OpenApiV3.IDocument
    | OpenApiV3_1.IDocument = JSON.parse(
    await fs.promises.readFile("swagger.json", "utf8"),
  );
  typia.assert(swagger); // recommended

  // convert to emended OpenAPI document,
  // and compose LLM function calling application
  const document: OpenApi.IDocument = OpenApi.convert(swagger);
  const application: IHttpLlmApplication = HttpLlm.application(document);

  // Let's imagine that LLM has selected a function to call
  const func: IHttpLlmFunction | undefined = application.functions.find(
    // (f) => f.name === "llm_selected_fuction_name"
    (f) => f.path === "/bbs/articles" && f.method === "post",
  );
  if (func === undefined) throw new Error("No matched function exists.");

  // actual execution is by yourself
  const article = await HttpLlm.execute({
    connection: {
      host: "http://localhost:3000",
    },
    application,
    function: func,
    arguments: [
      {
        title: "Hello, world!",
        body: "Let's imagine that this argument is composed by LLM.",
        thumbnail: null,
      },
    ],
  });
  console.log("article", article);
};
main().catch(console.error);

OpenAPI Definitions

flowchart
  v20(Swagger v2.0) --upgrades--> emended[["<b><u>OpenAPI v3.1 (emended)</u></b>"]]
  v30(OpenAPI v3.0) --upgrades--> emended
  v31(OpenAPI v3.1) --emends--> emended
  emended --downgrades--> v20d(Swagger v2.0)
  emended --downgrades--> v30d(Swagger v3.0)

@samchon/openapi support every versions of OpenAPI specifications with detailed TypeScript types.

• Swagger v2.0
• OpenAPI v3.0
• OpenAPI v3.1
• OpenAPI v3.1 emended

Also, @samchon/openapi provides "emended OpenAPI v3.1 definition" which has removed ambiguous and duplicated expressions for clarity. It has emended original OpenAPI v3.1 specification like above. You can compose the "emended OpenAPI v3.1 document" by calling the OpenApi.convert() function.

• Operation
  • Merge OpenApiV3_1.IPathItem.parameters to OpenApi.IOperation.parameters
  • Resolve references of OpenApiV3_1.IOperation members
  • Escape references of OpenApiV3_1.IComponents.examples
• JSON Schema
  • Decompose mixed type: OpenApiV3_1.IJsonSchema.IMixed
  • Resolve nullable property: OpenApiV3_1.IJsonSchema.__ISignificant.nullable
  • Array type utilizes only single OpenAPI.IJsonSchema.IArray.items
  • Tuple type utilizes only OpenApi.IJsonSchema.ITuple.prefixItems
  • Merge OpenApiV3_1.IJsonSchema.IAnyOf to OpenApi.IJsonSchema.IOneOf
  • Merge OpenApiV3_1.IJsonSchema.IRecursiveReference to OpenApi.IJsonSchema.IReference
  • Merge OpenApiV3_1.IJsonSchema.IAllOf to OpenApi.IJsonSchema.IObject

Conversions to another version's OpenAPI document is also based on the "emended OpenAPI v3.1 specification" like above diagram. You can do it through OpenApi.downgrade() function. Therefore, if you want to convert Swagger v2.0 document to OpenAPI v3.0 document, you have to call two functions; OpenApi.convert() and then OpenApi.downgrade().

At last, if you utilize typia library with @samchon/openapi types, you can validate whether your OpenAPI document is following the standard specification or not. Just visit one of below playground links, and paste your OpenAPI document URL address. This validation strategy would be superior than any other OpenAPI validator libraries.

• Playground Links
  • 💻 Type assertion
  • 💻 Detailed validation

import { OpenApi, OpenApiV3, OpenApiV3_1, SwaggerV2 } from "@samchon/openapi";
import typia from "typia";
 
const main = async (): Promise<void> => {
  // GET YOUR OPENAPI DOCUMENT
  const response: Response = await fetch(
    "https://raw.githubusercontent.com/samchon/openapi/master/examples/v3.0/openai.json"
  );
  const document: any = await response.json();
 
  // TYPE VALIDATION
  const result = typia.validate<
    | OpenApiV3_1.IDocument
    | OpenApiV3.IDocument
    | SwaggerV2.IDocument
  >(document);
  if (result.success === false) {
    console.error(result.errors);
    return;
  }
 
  // CONVERT TO EMENDED
  const emended: OpenApi.IDocument = OpenApi.convert(document);
  console.info(emended);
};
main().catch(console.error);

LLM Function Calling

Preface

flowchart
  subgraph "OpenAPI Specification"
    v20("Swagger v2.0") --upgrades--> emended[["OpenAPI v3.1 (emended)"]]
    v30("OpenAPI v3.0") --upgrades--> emended
    v31("OpenAPI v3.1") --emends--> emended
  end
  subgraph "Ecosystem"
    emended --normalizes--> migration[["Migration Schema"]]
    migration --"Artificial Intelligence"--> lfc{{"<b><u>LLM Function Calling Application</b></u>"}}
  end

LLM function calling application from OpenAPI document.

@samchon/openapi provides LLM (Large Language Model) funtion calling application from the "emended OpenAPI v3.1 document". Therefore, if you have any HTTP backend server and succeeded to build an OpenAPI document, you can easily make the A.I. chatbot application.

In the A.I. chatbot, LLM will select proper function to remotely call from the conversations with user, and fill arguments of the function automatically. If you actually execute the function call through the HttpLlm.execute() funtion, it is the "LLM function call."

Let's enjoy the fantastic LLM function calling feature very easily with @samchon/openapi.

• HttpLlm.application()
• IHttpLlmApplication
• IHttpLlmFunction
• ILlmSchema
• LlmTypeChecker

[!NOTE]

Preparing playground website utilizing web-llm.

[!TIP]

LLM selects proper function and fill arguments.

In nowadays, most LLM (Large Language Model) like OpenAI are supporting "function calling" feature. The "LLM function calling" means that LLM automatically selects a proper function and fills parameter values from conversation with the user (may by chatting text).

https://platform.openai.com/docs/guides/function-calling

Execution

Actual function call execution is by yourself.

LLM (Large Language Model) providers like OpenAI selects a proper function to call from the conversations with users, and fill arguments of it. However, function calling feature supported by LLM providers do not perform the function call execution. The actual execution responsibility is on you.

In @samchon/openapi, you can execute the LLM function calling by HttpLlm.execute() (or HttpLlm.propagate()) function. Here is an example code executing the LLM function calling through the HttpLlm.execute() function. As you can see, to execute the LLM function call, you have to deliver these informations:

• Connection info to the HTTP server
• Application of the LLM fuction calling
• LLM function schema to call
• Arguments for the function call (maybe composed by LLM)

import {
  HttpLlm,
  IHttpLlmApplication,
  IHttpLlmFunction,
  OpenApi,
  OpenApiV3,
  OpenApiV3_1,
  SwaggerV2,
} from "@samchon/openapi";
import fs from "fs";
import typia from "typia";
import { v4 } from "uuid";

const main = async (): Promise<void> => {
  // read swagger document and validate it
  const swagger:
    | SwaggerV2.IDocument
    | OpenApiV3.IDocument
    | OpenApiV3_1.IDocument = JSON.parse(
    await fs.promises.readFile("swagger.json", "utf8"),
  );
  typia.assert(swagger); // recommended

  // convert to emended OpenAPI document,
  // and compose LLM function calling application
  const document: OpenApi.IDocument = OpenApi.convert(swagger);
  const application: IHttpLlmApplication = HttpLlm.application(document);

  // Let's imagine that LLM has selected a function to call
  const func: IHttpLlmFunction | undefined = application.functions.find(
    // (f) => f.name === "llm_selected_fuction_name"
    (f) => f.path === "/bbs/{section}/articles/{id}" && f.method === "put",
  );
  if (func === undefined) throw new Error("No matched function exists.");

  // actual execution is by yourself
  const article = await HttpLlm.execute({
    connection: {
      host: "http://localhost:3000",
    },
    application,
    function: func,
    arguments: [
      "general",
      v4(),
      {
        title: "Hello, world!",
        body: "Let's imagine that this argument is composed by LLM.",
        thumbnail: null,
      },
    ],
  });
  console.log("article", article);
};
main().catch(console.error);

Keyword Parameter

Combine parameters into single object.

If you configure keyword option when composing the LLM (Large Language Model) function calling appliation, every parameters of OpenAPI operations would be combined to a single object type in the LLM funtion calling schema. This strategy is loved in many A.I. Chatbot developers, because LLM tends to a little professional in the single parameter function case.

Also, do not worry about the function call execution case. You don't need to resolve the keyworded parameter manually. The HttpLlm.execute() and HttpLlm.propagate() functions will resolve the keyworded parameter automatically by analyzing the IHttpLlmApplication.options property.

import {
  HttpLlm,
  IHttpLlmApplication,
  IHttpLlmFunction,
  OpenApi,
  OpenApiV3,
  OpenApiV3_1,
  SwaggerV2,
} from "@samchon/openapi";
import fs from "fs";
import typia from "typia";
import { v4 } from "uuid";

const main = async (): Promise<void> => {
  // read swagger document and validate it
  const swagger:
    | SwaggerV2.IDocument
    | OpenApiV3.IDocument
    | OpenApiV3_1.IDocument = JSON.parse(
    await fs.promises.readFile("swagger.json", "utf8"),
  );
  typia.assert(swagger); // recommended

  // convert to emended OpenAPI document,
  // and compose LLM function calling application
  const document: OpenApi.IDocument = OpenApi.convert(swagger);
  const application: IHttpLlmApplication = HttpLlm.application(document, {
    keyword: true,
  });

  // Let's imagine that LLM has selected a function to call
  const func: IHttpLlmFunction | undefined = application.functions.find(
    // (f) => f.name === "llm_selected_fuction_name"
    (f) => f.path === "/bbs/{section}/articles/{id}" && f.method === "put",
  );
  if (func === undefined) throw new Error("No matched function exists.");

  // actual execution is by yourself
  const article = await HttpLlm.execute({
    connection: {
      host: "http://localhost:3000",
    },
    application,
    function: func,
    arguments: [
      // one single object with key-value paired
      {
        section: "general",
        id: v4(),
        query: {
          language: "en-US",
          format: "markdown",
        },
        body: {
          title: "Hello, world!",
          body: "Let's imagine that this argument is composed by LLM.",
          thumbnail: null,
        },
      },
    ],
  });
  console.log("article", article);
};
main().catch(console.error);

Separation

Arguments from both Human and LLM sides.

When composing parameter arguments through the LLM (Large Language Model) function calling, there can be a case that some parameters (or nested properties) must be composed not by LLM, but by Human. File uploading feature, or sensitive information like secret key (password) cases are the representative examples.

In that case, you can configure the LLM function calling schemas to exclude such Human side parameters (or nested properties) by IHttpLlmApplication.options.separate property. Instead, you have to merge both Human and LLM composed parameters into one by calling the HttpLlm.mergeParameters() before the LLM function call execution of HttpLlm.execute() function.

Here is the example code separating the file uploading feature from the LLM function calling schema, and combining both Human and LLM composed parameters into one before the LLM function call execution.

import {
  HttpLlm,
  IHttpLlmApplication,
  IHttpLlmFunction,
  LlmTypeChecker,
  OpenApi,
  OpenApiV3,
  OpenApiV3_1,
  SwaggerV2,
} from "@samchon/openapi";
import fs from "fs";
import typia from "typia";
import { v4 } from "uuid";

const main = async (): Promise<void> => {
  // read swagger document and validate it
  const swagger:
    | SwaggerV2.IDocument
    | OpenApiV3.IDocument
    | OpenApiV3_1.IDocument = JSON.parse(
    await fs.promises.readFile("swagger.json", "utf8"),
  );
  typia.assert(swagger); // recommended

  // convert to emended OpenAPI document,
  // and compose LLM function calling application
  const document: OpenApi.IDocument = OpenApi.convert(swagger);
  const application: IHttpLlmApplication = HttpLlm.application(document, {
    keyword: false,
    separate: (schema) =>
      LlmTypeChecker.isString(schema) && schema.contentMediaType !== undefined,
  });

  // Let's imagine that LLM has selected a function to call
  const func: IHttpLlmFunction | undefined = application.functions.find(
    // (f) => f.name === "llm_selected_fuction_name"
    (f) => f.path === "/bbs/articles/{id}" && f.method === "put",
  );
  if (func === undefined) throw new Error("No matched function exists.");

  // actual execution is by yourself
  const article = await HttpLlm.execute({
    connection: {
      host: "http://localhost:3000",
    },
    application,
    function: func,
    arguments: HttpLlm.mergeParameters({
      function: func,
      llm: [
        // LLM composed parameter values
        "general",
        v4(),
        {
          language: "en-US",
          format: "markdown",
        },
        {
          title: "Hello, world!",
          content: "Let's imagine that this argument is composed by LLM.",
        },
      ],
      human: [
        // Human composed parameter values
        { thumbnail: "https://example.com/thumbnail.jpg" },
      ],
    }),
  });
  console.log("article", article);
};
main().catch(console.error);