feat: initial public version

sandbox/sandbox.go

@@ -0,0 +1,47 @@
+// Package sandbox provides a registry of sandboxes
+// for code execution.
+package sandbox
+
+import (
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/nalgeon/codapi/engine"
+)
+
+var ErrUnknownSandbox = errors.New("unknown sandbox")
+var ErrUnknownCommand = errors.New("unknown command")
+var ErrEmptyRequest = errors.New("empty request")
+
+// Validate checks if the code execution request is valid.
+func Validate(in engine.Request) error {
+	box, ok := engines[in.Sandbox]
+	if !ok {
+		return ErrUnknownSandbox
+	}
+	_, ok = box[in.Command]
+	if !ok {
+		return ErrUnknownCommand
+	}
+	if len(in.Files) < 2 && strings.TrimSpace(in.Files.First()) == "" {
+		return ErrEmptyRequest
+	}
+	return nil
+}
+
+// Exec executes the code using the appropriate sandbox.
+// Allows no more than pool.Size() concurrent workers at any given time.
+// The request must already be validated by Validate().
+func Exec(in engine.Request) engine.Execution {
+	err := semaphore.Acquire()
+	defer semaphore.Release()
+	if err == ErrBusy {
+		return engine.Fail(in.ID, engine.ErrBusy)
+	}
+	start := time.Now()
+	engine := engines[in.Sandbox][in.Command]
+	out := engine.Exec(in)
+	out.Duration = int(time.Since(start).Milliseconds())
+	return out
+}