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batch_example_test.go
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batch_example_test.go
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package batch_test
import (
"errors"
"fmt"
"os"
"strconv"
"github.com/veggiemonk/batch"
)
func Example() {
batchID := "38529598-becf-4bc6-8cfd-7308ba8e22f3"
// to mimic Cloud Run Jobs behavior
os.Setenv("CLOUD_RUN_TASK_COUNT", "3")
os.Setenv("CLOUD_RUN_TASK_INDEX", "1")
if err := run(batchID); err != nil {
panic(err)
}
// Output:
// [two three]
}
var (
request = "request"
ErrNoTaskFound = errors.New("task not found")
ErrTaskIndexOutOfBounds = errors.New("task index out of bounds")
)
func run(batchID string) error {
tasks, err := requestToTasks(request)
if err != nil {
return fmt.Errorf("request list tasks (id:%s): %w", batchID, err)
}
b, err := CloudRunJobs(tasks)
if err := process(b); err != nil {
return fmt.Errorf("process batch (id:%s): %w", batchID, err)
}
return nil
}
func requestToTasks(req string) ([]string, error) {
return []string{"one", "two", "three", "four", "five"}, nil
}
func process(tasks []string) error {
fmt.Printf("%v\n", tasks)
return nil
}
func CloudRunJobs[T any](tasks []T) ([]T, error) {
if len(tasks) == 0 {
return nil, ErrNoTaskFound
}
taskCount, err := strconv.Atoi(os.Getenv("CLOUD_RUN_TASK_COUNT"))
if err != nil {
return nil, err
}
taskIndex, err := strconv.Atoi(os.Getenv("CLOUD_RUN_TASK_INDEX"))
if err != nil {
return nil, err
}
batches := batch.Slice(tasks, taskCount)
if taskIndex >= len(batches) || taskIndex < 0 {
return nil, fmt.Errorf("index (%d) out of bounds (max: %d): %w", taskIndex, len(batches), ErrTaskIndexOutOfBounds)
}
b := batches[taskIndex]
return b, nil
}