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tools/form2table.lua @ 13186:affaf6d08d26
util.datamanager: Pad list writes to avoid crossing block boundaries
By padding items so that they do not cross block boundaries, it becomes
eaiser to delete whole blocks with fallocate() without cutting items
in half, improving efficiency of such operations.
Since list stores are used for message archives, where the most common
deletion operation would be of the oldest entires, at the top of the
file. With this, all blocks that contain items to be removed could be
deleted without needing to read, delete and write out the whole file.
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 07 Jun 2023 00:39:30 +0200 |
parent | 13142:879a6a33c21b |
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-- Read an XML dataform and spit out a serialized Lua table of it if not pcall(require, "prosody.loader") then pcall(require, "loader"); end local function from_stanza(stanza) local layout = { title = stanza:get_child_text("title"); instructions = stanza:get_child_text("instructions"); }; for tag in stanza:childtags("field") do local field = { name = tag.attr.var; type = tag.attr.type; label = tag.attr.label; desc = tag:get_child_text("desc"); required = tag:get_child("required") and true or nil; value = tag:get_child_text("value"); options = nil; }; if field.type == "list-single" or field.type == "list-multi" then local options = {}; for option in tag:childtags("option") do options[#options+1] = { label = option.attr.label, value = option:get_child_text("value") }; end field.options = options; end if field.type == "jid-multi" or field.type == "list-multi" or field.type == "text-multi" then local values = {}; for value in tag:childtags("value") do values[#values+1] = value:get_text(); end if field.type == "text-multi" then values = table.concat(values, "\n"); end field.value = values; end if field.type == "boolean" then field.value = field.value == "true" or field.value == "1"; end layout[#layout+1] = field; end return layout; end print("dataforms.new " .. require"prosody.util.serialization".serialize(from_stanza(require"prosody.util.xml".parse(io.read("*a"))), { unquoted = true }))