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genai.go
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genai.go
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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.
package genai
import (
"context"
"errors"
"fmt"
"strings"
"github.com/google/generative-ai-go/genai"
"google.golang.org/api/option"
)
type GenClient interface {
TokenCount(s string) int
Summarize(s string) (string, error)
}
type GeminiClient struct {
GenClient
ApiKey string
}
func NewGeminiClient(apiKey string) *GeminiClient {
return &GeminiClient{ApiKey: apiKey}
}
func (gc *GeminiClient) TokenCount(s string) int {
ctx := context.Background()
aic, err := genai.NewClient(ctx, option.WithAPIKey(gc.ApiKey))
if err != nil {
panic(err)
}
model := aic.GenerativeModel("gemini-pro")
resp, err := model.CountTokens(ctx, genai.Text(s))
if err != nil {
panic(err)
}
return int(resp.TotalTokens)
}
func (gc *GeminiClient) Summarize(s string) (string, error) {
ctx := context.Background()
aic, err := genai.NewClient(ctx, option.WithAPIKey(gc.ApiKey))
if err != nil {
panic(err)
}
model := aic.GenerativeModel("gemini-pro")
// model.SetMaxOutputTokens(2048)
model.SetTemperature(0.2)
resp, err := model.GenerateContent(ctx, genai.Text(s))
if err != nil {
panic(err)
}
if len(resp.Candidates) == 0 {
fmt.Println("No candidates found...")
return "", checkForFailReason(resp)
}
if resp.Candidates[0].FinishReason.String() != "FinishReasonStop" {
return "", errors.New(fmt.Sprintf("Finish reason: %v", resp.Candidates[0].FinishReason.String()))
}
var sb strings.Builder
for _, part := range resp.Candidates[0].Content.Parts {
v, ok := part.(genai.Text)
if ok {
sb.WriteString(string(v))
}
}
return sb.String(), nil
}
func checkForFailReason(resp *genai.GenerateContentResponse) error {
if resp.PromptFeedback.BlockReason.String() != "" {
return errors.New(resp.PromptFeedback.BlockReason.String())
}
if resp.PromptFeedback.BlockReason == 2 {
return errors.New("prompt blocked for unknown reasons")
}
var sb strings.Builder
for _, safetyRating := range resp.PromptFeedback.SafetyRatings {
if safetyRating.Blocked {
sb.WriteString(fmt.Sprintf("Category: %v Probability :%v\n", safetyRating.Category, safetyRating.Probability))
}
}
return errors.New(sb.String())
}