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request-helpers.ts
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request-helpers.ts
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/**
* @license
* Copyright 2024 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {
Content,
CountTokensRequest,
EmbedContentRequest,
GenerateContentRequest,
Part,
_CountTokensRequestInternal,
} from "../../types";
import {
GoogleGenerativeAIError,
GoogleGenerativeAIRequestInputError,
} from "../errors";
export function formatSystemInstruction(
input?: string | Part | Content,
): Content | undefined {
// null or undefined
if (input == null) {
return undefined;
} else if (typeof input === "string") {
return { role: "system", parts: [{ text: input }] } as Content;
} else if ((input as Part).text) {
return { role: "system", parts: [input as Part] };
} else if ((input as Content).parts) {
if (!(input as Content).role) {
return { role: "system", parts: (input as Content).parts };
} else {
return input as Content;
}
}
}
export function formatNewContent(
request: string | Array<string | Part>,
): Content {
let newParts: Part[] = [];
if (typeof request === "string") {
newParts = [{ text: request }];
} else {
for (const partOrString of request) {
if (typeof partOrString === "string") {
newParts.push({ text: partOrString });
} else {
newParts.push(partOrString);
}
}
}
return assignRoleToPartsAndValidateSendMessageRequest(newParts);
}
/**
* When multiple Part types (i.e. FunctionResponsePart and TextPart) are
* passed in a single Part array, we may need to assign different roles to each
* part. Currently only FunctionResponsePart requires a role other than 'user'.
* @private
* @param parts Array of parts to pass to the model
* @returns Array of content items
*/
function assignRoleToPartsAndValidateSendMessageRequest(
parts: Part[],
): Content {
const userContent: Content = { role: "user", parts: [] };
const functionContent: Content = { role: "function", parts: [] };
let hasUserContent = false;
let hasFunctionContent = false;
for (const part of parts) {
if ("functionResponse" in part) {
functionContent.parts.push(part);
hasFunctionContent = true;
} else {
userContent.parts.push(part);
hasUserContent = true;
}
}
if (hasUserContent && hasFunctionContent) {
throw new GoogleGenerativeAIError(
"Within a single message, FunctionResponse cannot be mixed with other type of part in the request for sending chat message.",
);
}
if (!hasUserContent && !hasFunctionContent) {
throw new GoogleGenerativeAIError(
"No content is provided for sending chat message.",
);
}
if (hasUserContent) {
return userContent;
}
return functionContent;
}
export function formatCountTokensInput(
params: CountTokensRequest | string | Array<string | Part>,
model: string,
): _CountTokensRequestInternal {
let formattedRequest: _CountTokensRequestInternal = {};
const containsGenerateContentRequest =
(params as CountTokensRequest).generateContentRequest != null;
if ((params as CountTokensRequest).contents) {
if (containsGenerateContentRequest) {
throw new GoogleGenerativeAIRequestInputError(
"CountTokensRequest must have one of contents or generateContentRequest, not both.",
);
}
formattedRequest = { ...(params as CountTokensRequest) };
} else if (containsGenerateContentRequest) {
formattedRequest = { ...(params as CountTokensRequest) };
formattedRequest.generateContentRequest.model = model;
} else {
// Array or string
const content = formatNewContent(params as string | Array<string | Part>);
formattedRequest.contents = [content];
}
return formattedRequest;
}
export function formatGenerateContentInput(
params: GenerateContentRequest | string | Array<string | Part>,
): GenerateContentRequest {
let formattedRequest: GenerateContentRequest;
if ((params as GenerateContentRequest).contents) {
formattedRequest = params as GenerateContentRequest;
} else {
// Array or string
const content = formatNewContent(params as string | Array<string | Part>);
formattedRequest = { contents: [content] };
}
if ((params as GenerateContentRequest).systemInstruction) {
formattedRequest.systemInstruction = formatSystemInstruction(
(params as GenerateContentRequest).systemInstruction,
);
}
return formattedRequest;
}
export function formatEmbedContentInput(
params: EmbedContentRequest | string | Array<string | Part>,
): EmbedContentRequest {
if (typeof params === "string" || Array.isArray(params)) {
const content = formatNewContent(params);
return { content };
}
return params;
}