add the default value of range['end']

Author: siyuan

lib/pipe/writer.lua

@@ -10,6 +10,8 @@ local to_str = strutil.to_str
 local BLOCK_SIZE = 1024 * 1024
 local SOCKET_TIMEOUTS = {5 * 1000, 100 * 1000, 100 * 1000}
 
+local INF = math.huge
+
 local function intersect(f1, t1, f2, t2)
     local f, t = math.max(f1, f2), math.min(t1, t2)
     if f > t then
@@ -30,7 +32,14 @@ local function write_data_to_ngx(pobj, ident, opts)
     local recv_left, recv_right = 0, 0
     local from, to
     if range ~= nil then
-        from, to = range['start'] + 1, range['end'] + 1
+        from = range['start'] + 1
+
+        if range['end'] ~= nil then
+            to = range['end'] + 1
+        else
+            to = INF
+        end
+
         if from > to then
             return nil, 'InvalidRange', string.format(
                 'start: %d is greater than end: %d', from, to)