use io module to save and load poplutation data backups

app/data/geonames_population_mappings.json

@@ -0,0 +1,252 @@
+{
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+  "AE": 4975593,
+  "AF": 29121286,
+  "AG": 86754,
+  "AI": 13254,
+  "AL": 2986952,
+  "AM": 2968000,
+  "AO": 13068161,
+  "AQ": null,
+  "AR": 41343201,
+  "AS": 57881,
+  "AT": 8205000,
+  "AU": 21515754,
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+  "AX": 26711,
+  "AZ": 8303512,
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+  "BD": 156118464,
+  "BE": 10403000,
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+  "BG": 7000039,
+  "BH": 738004,
+  "BI": 9863117,
+  "BJ": 9056010,
+  "BL": 8450,
+  "BM": 65365,
+  "BN": 395027,
+  "BO": 9947418,
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+  "CO": 47790000,
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+  "CY": 1102677,
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+  "DJ": 740528,
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+  "DM": 72813,
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+  "MF": 35925,
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+  "MH": 65859,
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+  "MY": 28274729,
+  "MZ": 22061451,
+  "NA": 2128471,
+  "NC": 216494,
+  "NE": 15878271,
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+  "NG": 154000000,
+  "NI": 5995928,
+  "NL": 16645000,
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+  "PF": 270485,
+  "PG": 6064515,
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+  "PK": 184404791,
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+  "PN": 46,
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+  "PY": 6375830,
+  "QA": 840926,
+  "RE": 776948,
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+  "RU": 140702000,
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+  "SY": 22198110,
+  "SZ": 1354051,
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+  "TG": 6587239,
+  "TH": 67089500,
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+  "TK": 1466,
+  "TL": 1154625,
+  "TM": 4940916,
+  "TN": 10589025,
+  "TO": 122580,
+  "TR": 77804122,
+  "TT": 1328019,
+  "TV": 10472,
+  "TW": 22894384,
+  "TZ": 41892895,
+  "UA": 45415596,
+  "UG": 33398682,
+  "UM": null,
+  "US": 310232863,
+  "UY": 3477000,
+  "UZ": 27865738,
+  "VA": 921,
+  "VC": 104217,
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+  "VI": 108708,
+  "VN": 89571130,
+  "VU": 221552,
+  "WF": 16025,
+  "WS": 192001,
+  "XK": 1800000,
+  "YE": 23495361,
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+  "ZM": 13460305,
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+}

app/utils/populations.py

@@ -1,9 +1,13 @@
 """app.utils.populations.py"""
+import json
 import logging
 
 import requests
 
+import app.io
+
 LOGGER = logging.getLogger(__name__)
+GEONAMES_BACKUP_PATH = "geonames_population_mappings.json"
 
 # Fetching of the populations.
 def fetch_populations():
@@ -20,12 +24,20 @@ def fetch_populations():
     mappings = {}
 
     # Fetch the countries.
-    countries = requests.get("http://api.geonames.org/countryInfoJSON?username=dperic").json()["geonames"]
-
-    # Go through all the countries and perform the mapping.
-    for country in countries:
-        mappings.update({country["countryCode"]: int(country["population"]) or None})
-
+    try:
+        countries = requests.get(
+            "http://api.geonames.org/countryInfoJSON", params={"username": "dperic"}, timeout=2
+        ).json()["geonames"]
+        # Go through all the countries and perform the mapping.
+        for country in countries:
+            mappings.update({country["countryCode"]: int(country["population"]) or None})
+
+        if mappings:
+            app.io.save(GEONAMES_BACKUP_PATH, mappings)
+    except (json.JSONDecodeError, KeyError, requests.exceptions.Timeout) as err:
+        LOGGER.warning(f"Error pulling population data. {err.__class__.__name__}: {err}")
+        mappings = app.io.load(GEONAMES_BACKUP_PATH)
+        LOGGER.info(f"Using backup data from {GEONAMES_BACKUP_PATH}")
     # Finally, return the mappings.
     return mappings