consul-kv-object

Store and retrive POJsO from consul keystore.

Usage

npm install --save consul-kv-object

var consul = require('consul')();
var kv = require('consul-kv-object')(consul.kv);

kv.set("test/key",{ pojo: true, nested: { yep: "asd" } });
kv.get("test/key", function( err, res ) { } );
kv.del("test/key");

Options

Options are passed as optional second parameter.
| Option | Default | Meaning | |--------------|-----------|---------| | mapTypes | true | Perform type mapping when setting and getting | guessTypes | false | Try to guess types when reading value with flags==0 | defaultType | see below | Default type to use when flag is not recognized | typeMapFlags | see below | Type mapping array | concurrency | 10 | Number of concurrent consul connections when setting values

Type mapping

Types are preserved using flags and flag mapping array. Each type has other flag value. When flag is not recognized or type mapping is disabled, consul-kv-object returns strings.

Type guessing

When using guessTypes: true consul-kv-object will try to convert consul keys to Numbers, Booleans and Dates based on built-in heuristic. Type guessing requires enabled type mapping. Types determined by flags have priority.
Aim of type guessing is to allow operator to manually instert value into consul keystore.

Default

By default consul-kv-object understands and maps following types:

• String
• Number
• Boolean
• Date

Custom

Other types can be mapped to be understood by consul-kv-object. To use custom types, pass a flag mapping array as typeMapFlags option. It should consits of:

[
    { match: Function, make: Function, guess: Function }, // flags: 0
    { match: Function, make: Function, guess: Function }, // flags: 1
    { match: Function, make: Function, guess: Function },    
    [...]   
]
``` 
* `match` is the *constructor function* of your object, the one which is in `instance.constructor`.
* `make` is a factory function which takes a string and returns instance of your object.
* `guess` is a filter function, that takes a string and returns `true` if it is valid string representation of this type. 

Objects used with `consul-kv-object` should have `.toString` method with enough representation
to re-construct object with `make` call.   
 
# Build and testing

Basic tests:
```bash
npm test

Test coverage:

npm run coverage

Acceptance tests with live consul:

consul agent -bootstrap -server -advertise=127.0.0.1 -data-dir=/tmp/ &
npm run acceptance