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function_calling.dart
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function_calling.dart
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// 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 'dart:io';
import 'package:google_generative_ai/google_generative_ai.dart';
final apiKey = () {
final apiKey = Platform.environment['GEMINI_API_KEY'];
if (apiKey == null) {
stderr.writeln(r'No $GEMINI_API_KEY environment variable');
exit(1);
}
return apiKey;
}();
Future<void> functionCalling() async {
// [START function_calling]
Map<String, Object?> setLightValues(Map<String, Object?> args) {
return args;
}
final controlLightFunction = FunctionDeclaration(
'controlLight',
'Set the brightness and color temperature of a room light.',
Schema.object(properties: {
'brightness': Schema.number(
description:
'Light level from 0 to 100. Zero is off and 100 is full brightness.',
nullable: false),
'colorTemperatur': Schema.string(
description:
'Color temperature of the light fixture which can be `daylight`, `cool`, or `warm`',
nullable: false),
}));
final functions = {controlLightFunction.name: setLightValues};
FunctionResponse dispatchFunctionCall(FunctionCall call) {
final function = functions[call.name]!;
final result = function(call.args);
return FunctionResponse(call.name, result);
}
final model = GenerativeModel(
model: 'gemini-1.5-pro',
apiKey: apiKey,
tools: [
Tool(functionDeclarations: [controlLightFunction])
],
);
final prompt = 'Dim the lights so the room feels cozy and warm.';
final content = [Content.text(prompt)];
var response = await model.generateContent(content);
List<FunctionCall> functionCalls;
while ((functionCalls = response.functionCalls.toList()).isNotEmpty) {
var responses = <FunctionResponse>[
for (final functionCall in functionCalls)
dispatchFunctionCall(functionCall)
];
content
..add(response.candidates.first.content)
..add(Content.functionResponses(responses));
response = await model.generateContent(content);
}
print('Response: ${response.text}');
// [END function_calling]
}
void main() async {
await functionCalling();
}