How use ngx.shared.Dict.flush_all()?

[Ivan Smirnov]

    server {
        server_name ivan;
        listen 8080;
        location / {
            rewrite_by_lua_block{
                local data = ngx.shared.data
                ngx.say("data : ")
                for _,v in pairs(ngx.shared.data:get_keys()) do
                    ngx.say(v.." : "..ngx.shared.data:get(v))
                end
            }
        location /clear/ {
            rewrite_by_lua_block{
                local data = ngx.shared.data
                data.flush_all()
            }
        }
    }

after curl http://localhost:8086/clear/ i expect that all keys were expired, but in my nginx error log i see the error:
  2016/12/12 13:07:27 [error] 7198#0: *6 lua entry thread aborted: runtime error: rewrite_by_lua(common.conf:52):3: expecting 1 argument, but seen 0
stack traceback:
coroutine 0:
    [C]: in function 'flush_all'
    rewrite_by_lua(common.conf:52):3: in function <rewrite_by_lua(common.conf:52):1>, client: 127.0.0.1, server: ivan, request: "GET /clear/ HTTP/1.1", host: "localhost:8080"
in documentation flush_all use without arguments.

[Itamar Gilad]

When calling with the dot you are merely using the function from the instance table, but not passing the reference to it as the first parameter. You need to use lua's syntactic sugar for method calls with colon calls (change data.flush_all() to data:flush_all() ), or pass the instance explicitly (data.flush_all(data), but I think you'll agree that looks silly).

-Itamar

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Best regards,

Itamar Gilad

CTO & co-founder, Metapacket