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Pop From Queue Front (LCC.kvdb.queue.pop_front)

Signature​

value, err = LCC.kvdb.queue.pop_front(name, timeout?)
values, err = LCC.kvdb.queue.pop_front({name = name, max = n}, timeout?)

Parameters​

  • name String. Queue name (non-empty, max 256 bytes). Pass {name = "...", max = n} for batch pop.
  • timeout
    Number, optional. Request timeout in seconds, default 60.

Returns​

  • value
    String. The item removed from the head; nil when the queue is empty.
  • values String array. Items removed in batch mode; {} when the queue is empty.
  • err String or nil. Single-value mode returns 'not found' when the queue is empty or missing.

Notes​

Removes and returns the first element from the queue.
Batch mode returns up to max items in actual pop order. Returns nil, 'not found' when the queue is empty.

Example​

local value, err = LCC.kvdb.queue.pop_front("pending")
if value then
    print("Processing", value)
end

local values, batch_err = LCC.kvdb.queue.pop_front({name = "pending", max = 3})
for _, item in ipairs(values or {}) do
    print("Processing", item)
end