JSONFile.jsm, a new module to help with serializing JSON to disk

[Richard Newman]

As some of you know, Nick Alexander and I have been working on an
exploratory storage system called Datomish
<https://github.com/mozilla/datomish/>[1]. There's a blog post queued up,
but part of the idea is to make fairly fast, durable, flexible,
multi-consumer storage way easier to handle than starting out with
Sqlite.jsm and trying to figure out who owns the schema migration code.

One way to think about it: what if Prefs — the de facto lightweight
multi-consumer store in Gecko — was graph-structured, supported upserts and
indices and rules and transactions and full-text querying, and was actually
durable?

That's not at all in competition with a simple JSON file store — which
remains an excellent way to meet special-purpose, small-size storage needs,
and I'm glad to see Luke and co step up to maintain one!  — but it does
address many of the concerns in that original "Storage in Gecko" thread, so
I figured this was as good a place as any to mention it.

-R

[1] <https://github.com/mozilla/datomish/>

On Tue, Oct 11, 2016 at 12:53 PM, Chris Peterson <cpeterson at mozilla.com>
wrote:

> Is JSONFile.jsm suitable for the long-sought Gecko storage system that's
> not as hacky as about:config prefs or as heavyweight as SQLite? btw, I
> didn't see any tests specifically for JSONFile.jsm. Are the other Password
> Manager tests on top of JSONFile.jsm adequate test coverage?
>
> Here is a link to a 2013 "Storage in Gecko" thread on dev-platform
> bikeshedding requirements around sync/async APIs and atomic and lazy I/O.
> This thread spun out bug 866238 ("implement simple key-value store on top
> of IndexedDB").
>
> https://groups.google.com/d/msg/mozilla.dev.platform/
> vYbQqkqGzlo/YYIvd-rB9ToJ
>
>
>
> On 10/11/2016 7:53 AM, Luke Chang wrote:
>
> Hey folks,
>
> This is a notice about a module, JSONFile.jsm, just landed in
> "toolkit/modules".
>
> Matt, Steve and I have been working on Form Autofill [1]. While
> implementing, we intend to leverage modules of Password Manager because of
> their similar behaviors. LoginStore.jsm [2] is one of those modules.
>
> The above-mentioned JSONFile.jsm is basically separated from
> LoginStore.jsm, which is in charge of storing login-related data in a
> ".json" file. In order to increase the reusability of such JSON-formatted
> storage that we're going to use in Form Autofill as well, we refactored
> LoginStore.jsm. More specifically, those IO-specific APIs were generalized
> and moved to JSONFile.jsm. Therefore, LoginStore.jsm will focus on
> schema-related operations such as data migrations.
>
> To sum up, you can now utilize JSONFile.jsm to store simple data in a
> single file as long as the data can be serialized to JSON format. More
> details can be found in bug 1304322 [3].
>
> Thanks,
> Luke
>
> [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill
> [2] https://dxr.mozilla.org/mozilla-central/source/toolkit/components/
> passwordmgr/LoginStore.jsm
> [3] https://bugzilla.mozilla.org/show_bug.cgi?id=1304322
>
>
>
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