|
| 1 | +package gemini |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "context" |
| 6 | + "encoding/json" |
| 7 | + "fmt" |
| 8 | + "net/http" |
| 9 | + "os" |
| 10 | + |
| 11 | + "go-micro.dev/v5/genai" |
| 12 | +) |
| 13 | + |
| 14 | +// gemini implements the GenAI interface using Google Gemini 2.5 API. |
| 15 | +type gemini struct { |
| 16 | + options genai.Options |
| 17 | +} |
| 18 | + |
| 19 | +func New(opts ...genai.Option) genai.GenAI { |
| 20 | + var options genai.Options |
| 21 | + for _, o := range opts { |
| 22 | + o(&options) |
| 23 | + } |
| 24 | + if options.APIKey == "" { |
| 25 | + options.APIKey = os.Getenv("GEMINI_API_KEY") |
| 26 | + } |
| 27 | + return &gemini{options: options} |
| 28 | +} |
| 29 | + |
| 30 | +func (g *gemini) Generate(prompt string, opts ...genai.Option) (*genai.Result, error) { |
| 31 | + options := g.options |
| 32 | + for _, o := range opts { |
| 33 | + o(&options) |
| 34 | + } |
| 35 | + ctx := context.Background() |
| 36 | + |
| 37 | + res := &genai.Result{Prompt: prompt, Type: options.Type} |
| 38 | + |
| 39 | + endpoint := options.Endpoint |
| 40 | + if endpoint == "" { |
| 41 | + endpoint = "https://generativelanguage.googleapis.com/v1beta/models/" |
| 42 | + } |
| 43 | + |
| 44 | + var url string |
| 45 | + var body map[string]interface{} |
| 46 | + |
| 47 | + // Determine model to use |
| 48 | + var model string |
| 49 | + switch options.Type { |
| 50 | + case "image": |
| 51 | + if options.Model != "" { |
| 52 | + model = options.Model |
| 53 | + } else { |
| 54 | + model = "gemini-2.5-pro-vision" |
| 55 | + } |
| 56 | + url = endpoint + model + ":generateContent?key=" + options.APIKey |
| 57 | + body = map[string]interface{}{ |
| 58 | + "contents": []map[string]interface{}{ |
| 59 | + {"parts": []map[string]string{{"text": prompt}}}, |
| 60 | + }, |
| 61 | + } |
| 62 | + case "audio": |
| 63 | + if options.Model != "" { |
| 64 | + model = options.Model |
| 65 | + } else { |
| 66 | + model = "gemini-2.5-pro" |
| 67 | + } |
| 68 | + url = endpoint + model + ":generateContent?key=" + options.APIKey |
| 69 | + body = map[string]interface{}{ |
| 70 | + "contents": []map[string]interface{}{ |
| 71 | + {"parts": []map[string]string{{"text": prompt}}}, |
| 72 | + }, |
| 73 | + "response_mime_type": "audio/wav", |
| 74 | + } |
| 75 | + case "text": |
| 76 | + fallthrough |
| 77 | + default: |
| 78 | + if options.Model != "" { |
| 79 | + model = options.Model |
| 80 | + } else { |
| 81 | + model = "gemini-2.5-pro" |
| 82 | + } |
| 83 | + url = endpoint + model + ":generateContent?key=" + options.APIKey |
| 84 | + body = map[string]interface{}{ |
| 85 | + "contents": []map[string]interface{}{ |
| 86 | + {"parts": []map[string]string{{"text": prompt}}}, |
| 87 | + }, |
| 88 | + } |
| 89 | + } |
| 90 | + |
| 91 | + b, _ := json.Marshal(body) |
| 92 | + req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewReader(b)) |
| 93 | + if err != nil { |
| 94 | + return nil, err |
| 95 | + } |
| 96 | + req.Header.Set("Content-Type", "application/json") |
| 97 | + |
| 98 | + resp, err := http.DefaultClient.Do(req) |
| 99 | + if err != nil { |
| 100 | + return nil, err |
| 101 | + } |
| 102 | + defer resp.Body.Close() |
| 103 | + |
| 104 | + if options.Type == "audio" { |
| 105 | + var result struct { |
| 106 | + Candidates []struct { |
| 107 | + Content struct { |
| 108 | + Parts []struct { |
| 109 | + InlineData struct { |
| 110 | + Data []byte `json:"data"` |
| 111 | + } `json:"inline_data"` |
| 112 | + } `json:"parts"` |
| 113 | + } `json:"content"` |
| 114 | + } `json:"candidates"` |
| 115 | + } |
| 116 | + if err := json.NewDecoder(resp.Body).Decode(&result); err != nil { |
| 117 | + return nil, err |
| 118 | + } |
| 119 | + if len(result.Candidates) == 0 || len(result.Candidates[0].Content.Parts) == 0 { |
| 120 | + return nil, fmt.Errorf("no audio returned") |
| 121 | + } |
| 122 | + res.Data = result.Candidates[0].Content.Parts[0].InlineData.Data |
| 123 | + return res, nil |
| 124 | + } |
| 125 | + |
| 126 | + var result struct { |
| 127 | + Candidates []struct { |
| 128 | + Content struct { |
| 129 | + Parts []struct { |
| 130 | + Text string `json:"text"` |
| 131 | + } `json:"parts"` |
| 132 | + } `json:"content"` |
| 133 | + } `json:"candidates"` |
| 134 | + } |
| 135 | + if err := json.NewDecoder(resp.Body).Decode(&result); err != nil { |
| 136 | + return nil, err |
| 137 | + } |
| 138 | + if len(result.Candidates) == 0 || len(result.Candidates[0].Content.Parts) == 0 { |
| 139 | + return nil, fmt.Errorf("no candidates returned") |
| 140 | + } |
| 141 | + res.Text = result.Candidates[0].Content.Parts[0].Text |
| 142 | + return res, nil |
| 143 | +} |
| 144 | + |
| 145 | +func (g *gemini) Stream(prompt string, opts ...genai.Option) (*genai.Stream, error) { |
| 146 | + results := make(chan *genai.Result) |
| 147 | + go func() { |
| 148 | + defer close(results) |
| 149 | + res, err := g.Generate(prompt, opts...) |
| 150 | + if err != nil { |
| 151 | + // Send error via Stream.Err, not channel |
| 152 | + return |
| 153 | + } |
| 154 | + results <- res |
| 155 | + }() |
| 156 | + return &genai.Stream{Results: results}, nil |
| 157 | +} |
| 158 | + |
| 159 | +func init() { |
| 160 | + genai.Register("gemini", New()) |
| 161 | +} |
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