Add exponential backoff to refresh_channels

In practice with the patch I usually see backoff to 2 hours when blocked, so it should improve recovery time. The lim_thread is to work with multi-threading, not sure if it's the best way to do it.
This commit is contained in:
tleydxdy 2020-09-09 11:47:11 -04:00 committed by GitHub
parent 3ab3a5a236
commit f02ac01f7e
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23

View file

@ -3,15 +3,17 @@ def refresh_channels(db, logger, config)
spawn do
max_threads = max_channel.receive
lim_threads = max_threads
active_threads = 0
active_channel = Channel(Bool).new
backoff = 1.seconds
loop do
db.query("SELECT id FROM channels ORDER BY updated") do |rs|
rs.each do
id = rs.read(String)
if active_threads >= max_threads
if active_threads >= lim_threads
if active_channel.receive
active_threads -= 1
end
@ -22,12 +24,22 @@ def refresh_channels(db, logger, config)
begin
channel = fetch_channel(id, db, config.full_refresh)
lim_threads = max_threads
db.exec("UPDATE channels SET updated = $1, author = $2, deleted = false WHERE id = $3", Time.utc, channel.author, id)
rescue ex
logger.puts("#{id} : #{ex.message}")
if ex.message == "Deleted or invalid channel"
db.exec("UPDATE channels SET updated = $1, deleted = true WHERE id = $2", Time.utc, id)
else
lim_threads = 1
logger.puts("#{id} : backing off for #{backoff}s")
sleep backoff
if backoff < 1.days
backoff += backoff
else
backoff = 1.days
end
end
logger.puts("#{id} : #{ex.message}")
end
active_channel.send(true)