From 4f9ab8e952cb16a311bd533842296a5bd2e9cc1c Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Fri, 14 Feb 2025 16:28:57 +0200
Subject: Sleep for some short period of time before retrying after
 odb::recoverable exception

Also increase the default maximum number of retries for configuration to 20 from 10.
---
 mod/utility.cxx | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'mod/utility.cxx')

diff --git a/mod/utility.cxx b/mod/utility.cxx
index 5ca16a0..9b76a6e 100644
--- a/mod/utility.cxx
+++ b/mod/utility.cxx
@@ -3,8 +3,16 @@
 
 #include <mod/utility.hxx>
 
+#include <chrono>
+#include <random>
+#include <thread> // this_thread::sleep_for(), this_thread::yield()
+
 #include <libbutl/path-pattern.hxx>
 
+using namespace std;
+
+static thread_local mt19937 rand_gen (random_device {} ());
+
 namespace brep
 {
   string
@@ -66,4 +74,19 @@ namespace brep
 
     return r;
   }
+
+  void
+  sleep_before_retry (size_t retry, size_t max_time)
+  {
+    if (retry != 0)
+    {
+      size_t ms (
+        uniform_int_distribution<unsigned long> (
+          1, static_cast<unsigned long> (max_time)) (rand_gen));
+
+      this_thread::sleep_for (chrono::milliseconds (ms));
+    }
+    else
+      this_thread::yield ();
+  }
 }
-- 
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