Statebus file_store option should take a prefix rather than a boolean

[karth295]

E.g.

const bus = require('statebus').serve({file_store: {prefix: 'my_prefix'}})

$ diff server.js ~/statebus/server.js
9c9
<     file_store: {save_delay: 250, filename: 'db', backup_dir: 'backups', prefix: '*'},
---
>     file_store: {save_delay: 250, filename: 'db', backup_dir: 'backups'}, 
59c59
<             bus.file_store(bus.options.file_store.prefix)
---
>             bus.file_store('*')

I could also see an argument for an array:

const bus = require('statebus').serve({file_store: {prefixes: ['my_prefix_1', 'my_prefix_2']}})

Since this is a breaking change I'll let you deal with this.

[toomim]

1. Adding prefix to the .serve() options is straightforward—I was just waiting for someone to want that feature.
2. What do you mean by a boolean?
3. Instead of an array of prefixes, we could also support regular expressions. Then you could do this with prefix: /my_prefix_1|my_prefix_2/. We could add this support to statebus as a whole. I've just been waiting for someone to need this feature.

[karth295]

Re number 2: right now file_store takes a boolean for whether all state should be stored or not. If you specify {file_store: false}, then try to do bus.file_store('some-prefix'), it throws an error (iirc).

+1 to a regex.

[toomim]

Ok, now you can do:

bus = require('statebus').serve({file_store: {prefix: 'savely'}})

Does this solve for you? It's committed and in npm. ac172b6

Here's the full list of options for file_store and their defaults:

    file_store: {save_delay: 250, filename: 'db', backup_dir: 'backups', prefix: '*'}

I guess this should go on the wiki.

[toomim]

Ok, I've added the server options to the wiki.