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Merged
MichaelDoyle merged 1 commit into from
May 9, 2024
Merged

Implement tool calls for Google AI #49

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5 changes: 3 additions & 2 deletions js/plugins/googleai/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,8 @@
"compile": "tsup-node",
"build:clean": "rm -rf ./lib",
"build": "npm-run-all build:clean check compile",
"build:watch": "tsup-node --watch"
"build:watch": "tsup-node --watch",
"test": "tsx --test ./tests/*_test.ts"
},
"repository": {
"type": "git",
Expand All @@ -32,7 +33,7 @@
"dependencies": {
"@genkit-ai/ai": "workspace:*",
"@genkit-ai/core": "workspace:*",
"@google/generative-ai": "^0.6.0",
"@google/generative-ai": "^0.10.0",
"google-auth-library": "^9.6.3",
"node-fetch": "^3.3.2",
"zod": "^3.22.4"
Expand Down
125 changes: 114 additions & 11 deletions js/plugins/googleai/src/gemini.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,18 +26,26 @@ import {
modelRef,
ModelReference,
Part,
ToolDefinitionSchema,
ToolRequestPart,
ToolResponsePart,
} from '@genkit-ai/ai/model';
import {
downloadRequestMedia,
simulateSystemPrompt,
} from '@genkit-ai/ai/model/middleware';
import { GENKIT_CLIENT_HEADER } from '@genkit-ai/core';
import {
FunctionCallPart,
FunctionDeclaration,
FunctionDeclarationSchemaType,
FunctionResponsePart,
GenerateContentCandidate as GeminiCandidate,
Content as GeminiMessage,
Part as GeminiPart,
GenerateContentResponse,
GoogleGenerativeAI,
InlineDataPart,
RequestOptions,
StartChatParams,
} from '@google/generative-ai';
Expand Down Expand Up @@ -72,7 +80,7 @@ export const geminiPro = modelRef({
supports: {
multiturn: true,
media: false,
tools: false,
tools: true,
systemRole: true,
},
},
Expand Down Expand Up @@ -117,7 +125,7 @@ export const geminiUltra = modelRef({
supports: {
multiturn: true,
media: false,
tools: false,
tools: true,
systemRole: true,
},
},
Expand Down Expand Up @@ -171,7 +179,44 @@ function toGeminiRole(
}
}

function toInlineData(part: MediaPart): GeminiPart {
function convertSchemaProperty(property) {
if (!property) {
return null;
}
if (property.type === 'object') {
const nestedProperties = {};
Object.keys(property.properties).forEach((key) => {
nestedProperties[key] = convertSchemaProperty(property.properties[key]);
});
return {
type: FunctionDeclarationSchemaType.OBJECT,
properties: nestedProperties,
required: property.required,
};
} else if (property.type === 'array') {
return {
type: FunctionDeclarationSchemaType.ARRAY,
items: convertSchemaProperty(property.items),
};
} else {
return {
type: FunctionDeclarationSchemaType[property.type.toUpperCase()],
};
}
}

function toGeminiTool(
tool: z.infer<typeof ToolDefinitionSchema>
): FunctionDeclaration {
const declaration: FunctionDeclaration = {
name: tool.name.replace(/\//g, '__'), // Gemini throws on '/' in tool name
description: tool.description,
parameters: convertSchemaProperty(tool.inputSchema),
};
return declaration;
}

function toInlineData(part: MediaPart): InlineDataPart {
const dataUrl = part.media.url;
const b64Data = dataUrl.substring(dataUrl.indexOf(',')! + 1);
const contentType =
Expand All @@ -180,14 +225,14 @@ function toInlineData(part: MediaPart): GeminiPart {
return { inlineData: { mimeType: contentType, data: b64Data } };
}

function fromInlineData(inlinePart: GeminiPart): MediaPart {
function fromInlineData(inlinePart: InlineDataPart): MediaPart {
// Check if the required properties exist
if (
!inlinePart.inlineData ||
!inlinePart.inlineData.hasOwnProperty('mimeType') ||
!inlinePart.inlineData.hasOwnProperty('data')
) {
throw new Error('Invalid GeminiPart: missing required properties');
throw new Error('Invalid InlineDataPart: missing required properties');
}
const { mimeType, data } = inlinePart.inlineData;
// Combine data and mimeType into a data URL
Expand All @@ -200,19 +245,74 @@ function fromInlineData(inlinePart: GeminiPart): MediaPart {
};
}

function toFunctionCall(part: ToolRequestPart): FunctionCallPart {
if (!part?.toolRequest?.input) {
throw Error('Invalid ToolRequestPart: input was missing.');
}
return {
functionCall: {
name: part.toolRequest.name,
args: part.toolRequest.input,
},
};
}

function fromFunctionCall(part: FunctionCallPart): ToolRequestPart {
if (!part.functionCall) {
throw Error('Invalid FunctionCallPart');
}
return {
toolRequest: {
name: part.functionCall.name,
input: part.functionCall.args,
},
};
}

function toFunctionResponse(part: ToolResponsePart): FunctionResponsePart {
if (!part?.toolResponse?.output) {
throw Error('Invalid ToolResponsePart: output was missing.');
}
return {
functionResponse: {
name: part.toolResponse.name,
response: {
name: part.toolResponse.name,
content: part.toolResponse.output,
},
},
};
}

function fromFunctionResponse(part: FunctionResponsePart): ToolResponsePart {
if (!part.functionResponse) {
throw new Error('Invalid FunctionResponsePart.');
}
return {
toolResponse: {
name: part.functionResponse.name.replace(/__/g, '/'), // restore slashes
output: part.functionResponse.response,
},
};
}

function toGeminiPart(part: Part): GeminiPart {
if (part.text !== undefined) return { text: part.text };
if (part.media) return toInlineData(part);
throw new Error('Only text and media parts are supported currently.');
if (part.toolRequest) return toFunctionCall(part);
if (part.toolResponse) return toFunctionResponse(part);
throw new Error('Unsupported Part type');
}

function fromGeminiPart(part: GeminiPart): Part {
if (part.text !== undefined) return { text: part.text };
if (part.inlineData) return fromInlineData(part);
throw new Error('Only support text for the moment.');
if (part.functionCall) return fromFunctionCall(part);
if (part.functionResponse) return fromFunctionResponse(part);
throw new Error('Unsupported GeminiPart type');
}

function toGeminiMessage(
export function toGeminiMessage(
message: MessageData,
model?: ModelReference<z.ZodTypeAny>
): GeminiMessage {
Expand All @@ -222,7 +322,7 @@ function toGeminiMessage(
};
}

function toGeminiSystemInstruction(message: MessageData): GeminiMessage {
export function toGeminiSystemInstruction(message: MessageData): GeminiMessage {
return {
role: 'user',
parts: message.content.map(toGeminiPart),
Expand All @@ -246,9 +346,9 @@ function fromGeminiFinishReason(
}
}

function fromGeminiCandidate(candidate: GeminiCandidate): CandidateData {
export function fromGeminiCandidate(candidate: GeminiCandidate): CandidateData {
return {
index: candidate.index,
index: candidate.index || 0, // reasonable default?
message: {
role: 'model',
content: (candidate.content?.parts || []).map(fromGeminiPart),
Expand Down Expand Up @@ -335,6 +435,9 @@ export function googleAIModel(

const chatRequest = {
systemInstruction,
tools: request.tools?.length
? [{ functionDeclarations: request.tools?.map(toGeminiTool) }]
: [],
history: messages
.slice(0, -1)
.map((message) => toGeminiMessage(message, model)),
Expand Down
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