From e334706eb6f148baa6cadb8c2418918e34982ac4 Mon Sep 17 00:00:00 2001
From: Gertjan van den Burg <gertjanvandenburg@gmail.com>
Date: Mon, 17 Aug 2020 19:24:01 +0100
Subject: Add retries to the get_measles script

This script occassionally fails on Travis,
so we're adding some robustness to it.
---
 datasets/measles/get_measles.py | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/datasets/measles/get_measles.py b/datasets/measles/get_measles.py
index eb58824..13f6dc9 100644
--- a/datasets/measles/get_measles.py
+++ b/datasets/measles/get_measles.py
@@ -17,9 +17,12 @@ import clevercsv
 import hashlib
 import json
 import os
+import sys
+import time
 
 from functools import wraps
 from urllib.request import urlretrieve
+from urllib.error import URLError
 
 DAT_URL = "https://web.archive.org/web/20191128124615if_/https://ms.mcmaster.ca/~bolker/measdata/ewmeas.dat"
 
@@ -70,7 +73,20 @@ def validate(checksum):
 
 @validate(MD5_DAT)
 def download_zip(target_path=None):
-    urlretrieve(DAT_URL, target_path)
+    count = 0
+    while count < 5:
+        count += 1
+        try:
+            urlretrieve(DAT_URL, target_path)
+            return
+        except URLError as err:
+            print(
+                "Error occurred (%r) when trying to download zip. Retrying in 5 seconds"
+                % err,
+                sys.stderr,
+            )
+            time.sleep(5)
+
 
 
 @validate(MD5_JSON)
-- 
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