newScore02.go

// Package p contains a Firestore Cloud Function.
package p

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/functions/metadata"
)

// FirestoreEvent is the payload of a Firestore event.
// Please refer to the docs for additional information
// regarding Firestore events.
type FirestoreEvent struct {
	OldValue FirestoreValue `json:"oldValue"`
	Value    FirestoreValue `json:"value"`
}

// OnNewScore is triggered by a change to a Firestore document.
func OnNewScore(ctx context.Context, e FirestoreEvent) error {
	meta, err := metadata.FromContext(ctx)
	if err != nil {
		return fmt.Errorf("metadata.FromContext: %v", err)
	}
	log.Printf("Function triggered by change to: %v", meta.Resource)

	// Get data from Score
	score, err := NewFromFirestoreValue(e.Value)
	if err != nil {
		return err
	}
	log.Printf("%+v", score)
	return nil
}