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Prevent inconsistent data in json files. #74

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Prevent inconsistent data in json files. #74

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Prevent inconsistent data in json files.
therrmann-adwin Dec 1, 2015
4c15be9
Removed trailing whitespace in comment.
therrmann-adwin Dec 7, 2015
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12 changes: 8 additions & 4 deletions backend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -136,18 +136,22 @@ def extract_tunnel(nodes):
batadv_graph = graph.merge_nodes(batadv_graph)
batadv_graph = graph.to_undirected(batadv_graph)

# write processed data to dest dir
with open(nodes_fn, 'w') as f:
# write processed data to temporary files in dest dir
# and rename them atomically to prevent inconsistent data
with open(nodes_fn + '.tmp', 'w') as f:
json.dump(nodedb, f)
os.rename(nodes_fn + '.tmp', nodes_fn)

graph_out = {'batadv': json_graph.node_link_data(batadv_graph),
'version': GRAPH_VERSION}

with open(graph_fn, 'w') as f:
with open(graph_fn + '.tmp', 'w') as f:
json.dump(graph_out, f)
os.rename(graph_fn + '.tmp', graph_fn)

with open(nodelist_fn, 'w') as f:
with open(nodelist_fn + 'tmp', 'w') as f:
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There is a '.' missing in front of the tmp'

json.dump(export_nodelist(now, nodedb), f)
os.rename(nodelist_fn + '.tmp', nodelist_fn)

# optional rrd graphs (trigger with --rrd)
if params['rrd']:
Expand Down