functionCall.ts

functionCall.ts

export const functionCall = async (method: string, body: any): Promise<any> => {
    console.log("functionCall", method);

    // Constants for setting up metadata server request
    // See https://cloud.google.com/compute/docs/instances/verifying-instance-identity#request_signature
    const functionURL = `https://${REGION}-${PROJECT_ID}.cloudfunctions.net/${method}`;
    const metadataServerURL =
        "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/identity?audience=";
    const tokenUrl = metadataServerURL + functionURL;

    // Fetch the token
    console.log("functionCall get token", tokenUrl);
    const tokenResponse = await fetch.default(tokenUrl, {
        headers: {
            "Metadata-Flavor": "Google",
        },
    });
    const token = await tokenResponse.text();

    // Provide the token in the request to the receiving function
    console.log("functionCall fetch", token);
    const bodyText = JSON.stringify(body);
    console.log("functionCall fetch body", bodyText);
    const res = await fetch.default(functionURL, {
        method: "POST",
        headers: { Authorization: `bearer ${token}` },
        body: bodyText,
    });

    const json = await res.json();
    console.log("functionCall fetch result", json);
    return json;
};