From bb09157a49e513218271a8d1910bda0385793ef0 Mon Sep 17 00:00:00 2001
From: mokha <mokha@cisco.com>
Date: Sat, 10 Nov 2018 10:42:56 -0700
Subject: retry with exponential delay

---
 lib/net/hippie/client.rb | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

(limited to 'lib')

diff --git a/lib/net/hippie/client.rb b/lib/net/hippie/client.rb
index 9797697..7a153b8 100644
--- a/lib/net/hippie/client.rb
+++ b/lib/net/hippie/client.rb
@@ -62,13 +62,25 @@ module Net
         execute(uri, request, &block)
       end
 
+      # attempt 1 -> delay 1 second
+      # attempt 2 -> delay 2 second
+      # attempt 3 -> delay 4 second
+      # attempt 4 -> delay 8 second
+      # attempt 5 -> delay 16 second
+      # attempt 6 -> delay 32 second
+      # attempt 7 -> delay 64 second
+      # attempt 8 -> delay 128 second
       def with_retry(retries: 3)
-        retries.downto(0) do |n|
+        retries = 3 if retries <= 0
+        0.upto(retries) do |n|
           return yield self
         rescue *::Net::Hippie::CONNECTION_ERRORS => error
-          logger.error("Retry Attempt: #{n}")
-          logger.error(error)
-          raise error if n.zero?
+          raise error if n >= retries
+
+          delay = 2**n
+          logger.warn("Retry: #{n + 1}/#{retries}. Delay: #{delay} second(s)")
+          logger.warn(error.message)
+          sleep delay
         end
       end
 
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