|
| 1 | +--- |
| 2 | +title: "Image-to-image generation using Replicate and nano-banana" |
| 3 | +sidebarTitle: "Replicate image generation" |
| 4 | +description: "Learn how to generate images from source image URLs using Replicate and Trigger.dev." |
| 5 | +--- |
| 6 | + |
| 7 | +## Overview |
| 8 | + |
| 9 | +This example demonstrates how to use Trigger.dev to generate images from source image URLs using [Replicate](https://replicate.com/), the [nano-banana-image-to-image](https://replicate.com/meta/nano-banana-image-to-image) model. |
| 10 | + |
| 11 | +## Task code |
| 12 | + |
| 13 | +```tsx trigger/generateImage.tsx |
| 14 | +import { PutObjectCommand, S3Client } from "@aws-sdk/client-s3"; |
| 15 | +import { task, wait } from "@trigger.dev/sdk"; |
| 16 | +import Replicate, { Prediction } from "replicate"; |
| 17 | + |
| 18 | +// Initialize clients |
| 19 | +const replicate = new Replicate({ |
| 20 | + auth: process.env.REPLICATE_API_TOKEN, |
| 21 | +}); |
| 22 | + |
| 23 | +const s3Client = new S3Client({ |
| 24 | + region: "auto", |
| 25 | + endpoint: process.env.R2_ENDPOINT, |
| 26 | + credentials: { |
| 27 | + accessKeyId: process.env.R2_ACCESS_KEY_ID ?? "", |
| 28 | + secretAccessKey: process.env.R2_SECRET_ACCESS_KEY ?? "", |
| 29 | + }, |
| 30 | +}); |
| 31 | + |
| 32 | +const model = "google/nano-banana"; |
| 33 | + |
| 34 | +export const generateImageAndUploadToR2 = task({ |
| 35 | + id: "generate-image-and-upload-to-r2", |
| 36 | + run: async (payload: { prompt: string; imageUrl: string }) => { |
| 37 | + const { prompt, imageUrl } = payload; |
| 38 | + |
| 39 | + const token = await wait.createToken({ |
| 40 | + timeout: "10m", |
| 41 | + }); |
| 42 | + |
| 43 | + // Use Flux with structured prompt |
| 44 | + const output = await replicate.predictions.create({ |
| 45 | + model: model, |
| 46 | + input: { prompt, image_input: [imageUrl] }, |
| 47 | + // pass the provided URL to Replicate's webhook, so they can "callback" |
| 48 | + webhook: token.url, |
| 49 | + webhook_events_filter: ["completed"], |
| 50 | + }); |
| 51 | + |
| 52 | + const result = await wait.forToken<Prediction>(token).unwrap(); |
| 53 | + // unwrap() throws a timeout error or returns the result 👆 |
| 54 | + |
| 55 | + if (!result.ok) { |
| 56 | + throw new Error("Failed to create prediction"); |
| 57 | + } |
| 58 | + |
| 59 | + const generatedImageUrl = result.output.output; |
| 60 | + |
| 61 | + const image = await fetch(generatedImageUrl); |
| 62 | + const imageBuffer = Buffer.from(await image.arrayBuffer()); |
| 63 | + |
| 64 | + const base64Image = Buffer.from(imageBuffer).toString("base64"); |
| 65 | + |
| 66 | + const timestamp = Date.now(); |
| 67 | + const filename = `generated-${timestamp}.png`; |
| 68 | + |
| 69 | + // Generate unique key for R2 |
| 70 | + const sanitizedFileName = filename.replace(/[^a-zA-Z0-9.-]/g, "_"); |
| 71 | + const r2Key = `uploaded-images/${timestamp}-${sanitizedFileName}`; |
| 72 | + |
| 73 | + const uploadParams = { |
| 74 | + Bucket: process.env.R2_BUCKET, |
| 75 | + Key: r2Key, |
| 76 | + Body: imageBuffer, |
| 77 | + ContentType: "image/png", |
| 78 | + // Add cache control for better performance |
| 79 | + CacheControl: "public, max-age=31536000", // 1 year |
| 80 | + }; |
| 81 | + |
| 82 | + const uploadResult = await s3Client.send(new PutObjectCommand(uploadParams)); |
| 83 | + |
| 84 | + // Construct the public URL using the R2_PUBLIC_URL env var |
| 85 | + const publicUrl = `${process.env.R2_PUBLIC_URL}/${r2Key}`; |
| 86 | + |
| 87 | + return { |
| 88 | + success: true, |
| 89 | + publicUrl, |
| 90 | + originalPrompt: prompt, |
| 91 | + sourceImageUrl: imageUrl, |
| 92 | + }; |
| 93 | + }, |
| 94 | +}); |
| 95 | +``` |
| 96 | + |
| 97 | +## Environment variables |
| 98 | + |
| 99 | +You will need to set the following environment variables: |
| 100 | + |
| 101 | +``` |
| 102 | +TRIGGER_SECRET_KEY=<your-trigger-secret-key> |
| 103 | +REPLICATE_API_TOKEN=<your-replicate-api-token> |
| 104 | +R2_ENDPOINT=<your-r2-endpoint> |
| 105 | +R2_ACCESS_KEY_ID=<your-r2-access-key-id> |
| 106 | +R2_SECRET_ACCESS_KEY=<your-r2-secret-access-key> |
| 107 | +R2_BUCKET=<your-r2-bucket> |
| 108 | +R2_PUBLIC_URL=<your-r2-public-url> |
| 109 | +``` |
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