Memcing

Memcing is an in-memory key-value caching application with RESTful API.

Installation

npm install memcing

Usage

Interactive mode

npm start

Add an entry (add hello world) and see http://localhost:12080/entries/hello

Help

./memcing -help

  Options:
    -i                 : Enable interactive mode.
    -listen-http       : Listen HTTP requests. Default; 0.0.0.0:12080
    -load-file         : Load a command file.
    -cache-limit       : Cache size limit in bytes. Default (128MB); 134217728
    -entry-limit       : Entry size limit in bytes. Default (1KB); 1024
    -vacuum-delay      : Delay in seconds for vacuum. Default; 30
    -eviction          : Enable eviction mode.
    -debug             : Enable debug mode.
    -verbose           : Set verbose message level. Default; 1
    -help              : Display help and exit.
  stdin:
    -cmd               : Enable command mode for stdin.
    -csv               : Enable CSV mode for stdin.
    -csv-delimiter     : CSV delimiter (char or `tab`). Default; ,
    -csv-field-key     : Key field index on CSV. Default; 1
    -csv-field-filter  : Include fields on CSV. Default (all); null
                         Example; -csv-field-filter 1,2
  Interactive mode commands:
    get key
    set key value [expire = 0]
    add key value [expire = 0]
    increment key [amount = 1]
    decrement key [amount = 1]
    delete key
    drop
    dump
    stats
    vacuum
    exit

Examples

Interactive Mode

./memcing -load-file ../test/cmds-lf.txt -i -listen-http

Reads commands from cmds-lf.txt then switch to interactive mode and listen
ttp requests. The cached data will be available for REPL and RESTful API.

For RESTful API performance tests;

ab -n 10000 http://localhost:12080/entries/hello
ab -n 10000 -c 100 http://localhost:12080/entries/hello

Postal Code Service Example

You can easily create a postal code service;

wget -qO zip-codes.zip http://download.geonames.org/export/zip/US.zip && \
unzip -p zip-codes.zip US.txt | \
cat | \
./memcing -listen-http -csv -csv-delimiter tab -csv-field-key 2 -csv-field-filter 1,3,4,5,6,10,11

See http://localhost:12080/entries/78729

{
  "key":"78729",
  "val":"[\"US\",\"Austin\",\"Texas\",\"TX\",\"Williamson\",\"30.4521\",\"-97.7688\"]",
  "ts":1401417873489,
  "expTS":0
}

If you want to include other countries see http://download.geonames.org/export/zip/
and change the part (US.zip and US.txt) of the command at above.

RESTful API

RESTful API is still under development. For the current implementations see Implementations

• Use application/x-www-form-urlencoded for request method.
• Use val query parameter for value.
• Use exp query parameter for expiration.

PUT

/entries/{KEY}

PUT method represent the set command.

Examples:

curl -X PUT -d "val=world" http://localhost:12080/entries/hello
curl -X PUT -d "val=world&exp=10" http://localhost:12080/entries/bye

POST

/entries/{KEY}

POST method represent the add command.

Examples:

curl -X POST -d "val=1" http://localhost:12080/entries/counter

GET

/entries
/entries/{KEY}

GET method represent the get command.

Examples:

curl http://localhost:12080/entries
curl http://localhost:12080/entries/hello

DELETE

/entries
/entries/{KEY}

DELETE method represent the delete or the drop command.

Examples:

curl -X DELETE http://localhost:12080/entries/hello
curl -X DELETE http://localhost:12080/entries

Notes

• It is ‘originally’ developed for code exercise. The requirements were;
  non-persistent, non-durable and supporting eviction.

Implementations

• Interactive mode
• RESTful API
  • GET
    • Collection (/entries)
    • Element (/entries/{KEY})
  • PUT
    • Collection (/entries)
    • Element (/entries/{KEY})
  • POST
    • Collection (/entries)
    • Element (/entries/{KEY})
  • DELETE
    • Collection (/entries)
    • Element (/entries/{KEY})

License

Licensed under The MIT License (MIT)
For the full copyright and license information, please view the LICENSE.txt file.