Awesome

lua-resty-hyperloglog

lua-resty-hyperloglog is hyperloglog for openresty.

Table of Contents

• Status
• Synopsis
• Methods
  • new
  • insert
  • count
  • merge
  • close
• Author
• Copyright and License

Status

This library is still under early development and is still experimental.

Synopsis

http {

    ...

    lua_shared_dict hll_count 10m;

    init_by_lua_block {
        local hll = require "resty.hyperloglog"
        h = hll.new("hll_count", 12)
    }

    server {
        listen 8080;

        location / {
            access_by_lua_block {
                h:insert(ngx.var.uri)
            }

            ...
        }

        location = /stats {
            content_by_lua_block {
                ngx.print("count:", h:count())
                ngx.exit(ngx.HTTP_OK)
            }
        }
    }
}

Back to TOC

Methods

new

syntax: h, err = hll.new(name, log2m)

Create a hyperloglog object with 2^log2m bucket. Returns nil on error.

insert

syntax: h:insert(str)

Insert a string to hyperloglog object.

count

syntax: c = h:count()

Returns the cardinality of the hyperloglog object.

merge

syntax: ok, err = h:merge(h2)

Merge another hyperloglog object(h2) into h. Returns false on error.

close

syntax: h:close()

Close the hyperloglog object.

Back to TOC

Author

wenqiang li(vislee)

Back to TOC

Copyright and License

This module is licensed under the BSD License.

Copyright (C) by vislee.

All rights reserved.

Back to TOC