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changeset 1536:34ae786771b6

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make Web_search transaction safe
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 07 Aug 2020 13:34:25 -0600
parents e73b72a510b4
children f7649ad6e3e7
files src/luan/modules/lucene/Web_search.luan
diffstat 1 files changed, 38 insertions(+), 7 deletions(-) [+]
line wrap: on
line diff
--- a/src/luan/modules/lucene/Web_search.luan	Sun Aug 02 21:30:47 2020 -0600
+++ b/src/luan/modules/lucene/Web_search.luan	Fri Aug 07 13:34:25 2020 -0600
@@ -5,6 +5,7 @@
 local range = Luan.range or error()
 local stringify = Luan.stringify or error()
 local eval = Luan.eval or error()
+local type = Luan.type or error()
 local Io = require "luan:Io.luan"
 local Http = require "luan:http/Http.luan"
 local String = require "luan:String.luan"
@@ -12,6 +13,8 @@
 local Html = require "luan:Html.luan"
 local html_encode = Html.encode or error()
 local Number = require "luan:Number.luan"
+local Table = require "luan:Table.luan"
+local size = Table.size or error()
 
 
 local Web_search = {}
@@ -44,6 +47,9 @@
 				padding: .5em;
 				border-radius: 4px;
 			}
+			textarea[name="old"] {
+				display: none;
+			}
 <%
 end
 
@@ -174,6 +180,7 @@
 	local id = string_to_number(Http.request.parameters.id)
 	local doc = index.get_document("id:"..id)
 	doc = stringify(doc,{strict=true,number_types=true})
+	doc = html_encode(doc)
 %>
 <!doctype html>
 <html>
@@ -187,7 +194,8 @@
 		<h2>Lucene Edit</h2>
 		<form action="?" method=post>
 			<input hidden name=id value="<%=id%>">
-			<div><textarea name="doc" rows="20" cols="90" autofocus><%=html_encode(doc)%></textarea></div>
+			<textarea name="old" ><%=doc%></textarea>
+			<div><textarea name="doc" rows="20" cols="90" autofocus><%=doc%></textarea></div>
 			<div><input type="submit" value="Update"></div>
 		</form>
 	</body>
@@ -196,15 +204,38 @@
 end
 
 
+local function equal(tbl1,tbl2)
+	if size(tbl1) ~= size(tbl2) then
+		return false
+	end
+	for key, value1 in pairs(tbl1) do
+		local value2 = tbl2[key]
+		if type(value1) == "table" then
+			if type(value2) ~= "table" or not equal(value1,value2) then
+				return false
+			end
+		elseif value1 ~= value2 then
+			return false
+		end
+	end
+	return true
+end
+
 local function update(index)
 	local doc = Http.request.parameters.doc
 	doc = eval( doc, "lucene", Number )
-	if doc == nil then
-		local id = Http.request.parameters.id
-		index.delete("id:"..id)
-	else
-		index.save(doc)
-	end
+	local old = Http.request.parameters.old
+	old = eval( old, "lucene", Number )
+	local id = Http.request.parameters.id
+	index.run_in_transaction( function()
+		local current = index.get_document("id:"..id)
+		equal(current,old) or error "document has changed"
+		if doc == nil then
+			index.delete("id:"..id)
+		else
+			index.save(doc)
+		end
+	end )
 %>
 <!doctype html>
 <html>