[exporter/datadog] Do not read response if nil on logs error

.chloggen/mx-psi_logs-exporter-crash.yaml

@@ -0,0 +1,11 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: datadogexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fixes crash when logging error on logs exporter
+
+# One or more tracking issues related to the change
+issues: [16077]

exporter/datadogexporter/internal/logs/sender.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/DataDog/datadog-api-client-go/v2/api/datadog"
 	"github.com/DataDog/datadog-api-client-go/v2/api/datadogV2"
+	"go.opentelemetry.io/collector/consumer/consumererror"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
 	"go.uber.org/zap"
 
@@ -73,10 +74,16 @@ func (s *Sender) SubmitLogs(ctx context.Context, payload []datadogV2.HTTPLogItem
 	}
 	_, r, err := s.api.SubmitLog(ctx, payload, s.opts)
 	if err != nil {
-		b := make([]byte, 1024) // 1KB message max
-		n, _ := r.Body.Read(b)  // ignore any error
-		s.logger.Error("Failed to send logs", zap.Error(err), zap.String("msg", string(b[:n])), zap.String("status_code", r.Status))
-		return err
+		if r != nil {
+			b := make([]byte, 1024) // 1KB message max
+			n, _ := r.Body.Read(b)  // ignore any error
+			s.logger.Error("Failed to send logs", zap.Error(err), zap.String("msg", string(b[:n])), zap.String("status_code", r.Status))
+			return err
+		}
+
+		// If response is nil assume permanent error.
+		// The error will be logged by the exporter helper.
+		return consumererror.NewPermanent(err)
 	}
 	return nil
 }