From dfc76eecd057999c6f0f2eca09e827ea1dc1419a Mon Sep 17 00:00:00 2001
From: Kylesoda <249518290+kylesoda@users.noreply.github.com>
Date: Mon, 6 Apr 2026 13:50:36 -0500
Subject: [PATCH] feat: implement ETL process with extractors and loaders

---
 scripts/test-etl/main.go | 136 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 scripts/test-etl/main.go

diff --git a/scripts/test-etl/main.go b/scripts/test-etl/main.go
new file mode 100644
index 0000000..8426b5a
--- /dev/null
+++ b/scripts/test-etl/main.go
@@ -0,0 +1,136 @@
+package main
+
+import (
+	"fmt"
+	"iter"
+	"math/rand"
+	"sync"
+	"time"
+)
+
+const (
+	NumExtractors       int = 2
+	NumLoaders          int = 4
+	ChunkSize           int = 20
+	totalRecords        int = 500
+	queueSize           int = 10
+	recordsPerExtractor int = totalRecords / NumExtractors
+)
+
+type Record struct {
+	Id   int
+	Data string
+}
+
+var idCounter int = 0
+
+func generateData(max int) iter.Seq[Record] {
+	time.Sleep(randomDurationMs(500, 1500))
+
+	return func(yield func(Record) bool) {
+		for i := range max {
+			record := Record{
+				Id:   idCounter,
+				Data: fmt.Sprintf("Data-%d", i),
+			}
+			idCounter++
+
+			if !yield(record) {
+				return
+			}
+		}
+	}
+}
+
+func randomDurationMs(min int, max int) time.Duration {
+	if min < 0 {
+		panic(fmt.Sprintf(`Invalid negative value for "min" argument: (min=%d)`, min))
+	}
+
+	if max <= min {
+		panic(fmt.Sprintf(`Invalid value for "max" argument: (max=%d), "max" should be greater than "min"`, max))
+	}
+
+	return time.Duration(min+rand.Intn(max-min)) * time.Millisecond
+}
+
+func Extractor(id int, chunkSize int, out chan<- []Record) {
+	chunk := make([]Record, 0, chunkSize)
+
+	for record := range generateData(recordsPerExtractor) {
+		chunk = append(chunk, record)
+
+		if len(chunk) == chunkSize {
+			out <- chunk
+			chunk = make([]Record, 0, chunkSize)
+			fmt.Printf("[Extractor %d] Lote enviado\n", id)
+		}
+	}
+
+	if len(chunk) > 0 {
+		out <- chunk
+		fmt.Printf("[Extractor %d] Lote enviado (residuos=%d)\n", id, len(chunk))
+	}
+}
+
+func Transformer(id int, in <-chan []Record, out chan<- []Record) {
+	for records := range in {
+		fmt.Printf("[Transformer %d] Transformando lote de %d registros...\n", id, len(records))
+		time.Sleep(randomDurationMs(50, 200))
+
+		for i, record := range records {
+			records[i].Data = record.Data + "-transformed"
+		}
+
+		out <- records
+	}
+}
+
+func Loader(id int, in <-chan []Record) {
+	for chunk := range in {
+		fmt.Printf("[Loader %d] Procesando lote de %d registros...\n", id, len(chunk))
+		time.Sleep(randomDurationMs(100, 3000))
+	}
+}
+
+func main() {
+	chChunksExtract := make(chan []Record, queueSize)
+	chChunksTransform := make(chan []Record, queueSize)
+
+	var wgExtractors sync.WaitGroup
+	for i := 1; i <= NumExtractors; i++ {
+		wgExtractors.Go(func() {
+			Extractor(i, ChunkSize, chChunksExtract)
+		})
+	}
+
+	go func() {
+		wgExtractors.Wait()
+		close(chChunksExtract)
+		fmt.Println("--- Todos los extractores terminaron. Canal cerrado (chChunksExtract). ---")
+	}()
+
+	var wgTransformers sync.WaitGroup
+	for i := 1; i <= NumExtractors; i++ {
+		wgTransformers.Go(func() {
+			Transformer(i, chChunksExtract, chChunksTransform)
+		})
+	}
+
+	go func() {
+		wgTransformers.Wait()
+		close(chChunksTransform)
+		fmt.Println("--- Todos los transformadores terminaron. Canal cerrado (chChunksTransform). ---")
+	}()
+
+	var wgLoaders sync.WaitGroup
+	for i := 1; i <= NumLoaders; i++ {
+		wgLoaders.Go(func() {
+			Loader(i, chChunksTransform)
+		})
+	}
+
+	start := time.Now()
+	wgLoaders.Wait()
+	fmt.Printf("ETL Finalizado en %v\n", time.Since(start))
+}