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Cloud Vision

The cloud_vision_flows library integrates key Google Cloud Vision functionalities into the Flows Network platform. You can easily perform tasks such as text detection on images using Google Cloud Vision's powerful image analysis capabilities.

Trigger​

A Flows Function waits for a request to occur. This request could be the need to extract text from an image. For our example on this page, the function utilizes the method request_received() to respond to such requests.

Action​

When a function is triggered by an event, it performs a corresponding action. In this case, the action could be detecting text from an image using Google Cloud Vision. The action to be taken upon receiving a request is defined by the user.

Here is a minimal example:

use cloud_vision_flows::text_detection;
use lambda_flows::{request_received, send_response};

#[no_mangle]
pub fn run() {
    request_received(|_qry, body| {
        let text = text_detection(String::from_utf8(body).unwrap());
        match text {
            Ok(r) => send_response(
                200,
                vec![(
                    String::from("content-type"),
                    String::from("text/plain; charset=UTF-8"),
                )],
                r.as_bytes().to_vec(),
            ),
            Err(e) => send_response(
                500,
                vec![(
                    String::from("content-type"),
                    String::from("text/plain; charset=UTF-8"),
                )],
                e.as_bytes().to_vec(),
            ),
        }
    });
}

This program takes a base64 encoded image as a request, extracts text from it using Google Cloud Vision, and sends back the extracted text or an error message as a response.

API Reference​

https://docs.rs/cloud_vision_flows