Commit graph

1105 commits

Author SHA1 Message Date
Jesse Rosenberger
5939327edd
Publish
- apollo-server-azure-functions@2.3.3
 - apollo-server-cloud-functions@2.3.3
 - apollo-server-cloudflare@2.3.3
 - apollo-server-core@2.3.3
 - apollo-server-express@2.3.3
 - apollo-server-hapi@2.3.3
 - apollo-server-integration-testsuite@2.3.3
 - apollo-server-koa@2.3.3
 - apollo-server-lambda@2.3.3
 - apollo-server-micro@2.3.3
 - apollo-server-plugin-base@0.2.3
 - apollo-server-testing@2.3.3
 - apollo-server@2.3.3
 - graphql-extensions@0.4.3
2019-01-29 11:51:30 +02:00
Jesse Rosenberger
db39aa5604
Remove willStart from apollo-server, already called via …-express. (#2239)
* Remove `willStart` from `apollo-server`, already called via `...-express`.

When the request pipeline was initially introduced, the integrations
had yet to be updated to call the new life-cycle events.  Now, the
integrations have all caught up, but `apollo-server` is still calling
`willStart`, despite the fact that its dependency which provides the actual
server implementation — `apollo-server-express` – is _also_ calling it,
resulting in double invocation of this event.

I suspect some follow-up work should guard against this possibility, but for
now this should remove the duplication.

* Update CHANGELOG.md for #2239.

Ref: https://github.com/apollographql/apollo-server/pull/2239
2019-01-29 11:39:08 +02:00
Kurt Mackey
cd674aae72 More strict check for node version for graphql-upload (#2235)
Stop traversing the `graphql-upload` module tree in all non-Node.js environments, to support subset-V8 runtimes like Fly.io.
2019-01-29 11:36:40 +02:00
renovate[bot]
82674bf129
chore(deps): update dependency koa to v2.7.0 (#2233) 2019-01-28 11:09:34 +00:00
Arthie
0e5437bd0e
Fix Typescript WebSocket import error
I get the following error when using the apollo-server-core with typescript (3.2.4) :

node_modules/apollo-server-core/dist/types.d.ts:4:8 - error TS1192: Module '"/node_modules/@types/ws/index"' has no default export.
import WebSocket from 'ws';

The change fixes this error!
2019-01-26 12:42:53 +01:00
Jesse Rosenberger
d48d0972c5
Publish
- apollo-cache-control@0.4.1
 - apollo-datasource-rest@0.2.2
 - apollo-datasource@0.2.2
 - apollo-engine-reporting@0.2.1
 - apollo-server-azure-functions@2.3.2
 - apollo-server-cache-memcached@0.2.2
 - apollo-server-cache-redis@0.2.2
 - apollo-server-caching@0.2.2
 - apollo-server-cloud-functions@2.3.2
 - apollo-server-cloudflare@2.3.2
 - apollo-server-core@2.3.2
 - apollo-server-express@2.3.2
 - apollo-server-hapi@2.3.2
 - apollo-server-integration-testsuite@2.3.2
 - apollo-server-koa@2.3.2
 - apollo-server-lambda@2.3.2
 - apollo-server-micro@2.3.2
 - apollo-server-plugin-base@0.2.2
 - apollo-server-testing@2.3.2
 - apollo-server@2.3.2
 - apollo-tracing@0.4.1
 - graphql-extensions@0.4.2
2019-01-25 18:48:18 +02:00
Jesse Rosenberger
14c93a5ecf
Update apollo-cache-control's CHANGELOG.md in preparation for publishing. 2019-01-25 18:19:43 +02:00
David Glasser
821578775d apollo-cache-control: consider hintless root fields to be uncached (#2210)
This is consistent with the old engineproxy interpretation of cache hints. We
special-case scalar fields to inherit their parent field's hints for
simplicity (so you don't have to hint every scalar field in a hinted object),
but when the parent field is non-root that inherited hint gets defaultMaxAge
applied to it. When the parent field is the root, that inherited hint doesn't
get defaultMaxAge applied because we don't run willResolveField for the root
query.

Includes a CHANGELOG update for #2197.
2019-01-25 18:06:25 +02:00
Jesse Rosenberger
18d9041db7
Don't write to persisted query cache until execution will begin. (#2227)
Since we already write to the persisted query cache asynchronously (and
intentionally do not await the Promise) this won't have any affect on the
current behavior of when the persisted query cache is written to in the
event of an executable request, but if an operation comes in and doesn't
parse or validate, we'll avoid wasting cache space on an operation that will
never execute.

Additionally, in a similar light, if a plugin throws an error which stops
execution, we can avoid the side-effect of writing to the persisted query
cache.

In terms of the APQ behavior, while this could cause additional round-trips
for a client which repeatedly sends an invalid operation, that operation is
never going to successfully finish anyway.  While developer tooling will
help avoid this problem in the first place, this refusal to store an invalid
operation in the APQ cache could actually help diagnose a failure since the
full operation (rather than just the SHA256 of that document) will appear
in the browser's dev-tools on the retry.

If we're looking to spare parsing and validating documents which we know are
going to fail, I think that's going to be a better use of the (new)
`documentStore` cache (#2111), since its in-memory and can accommodate a
more complex data structure which includes the validation errors from the
previous attempt which will, of course, be the same when validating the same
operation against the same schema again.  As the PR that introduced that
feature shows, sparing those additional parses and validations (cached APQ
documents still needs to be parsed and validated, currently) will provide a
more successful performance win overall.

Ref: https://github.com/apollographql/apollo-server/pull/2111
2019-01-25 18:01:15 +02:00
renovate[bot]
117ea3042b chore(deps): update dependency prettier to v1.16.1 (#2203)
This PR contains the following updates:

| Package | Type | Update | Change | References |
|---|---|---|---|---|
| prettier | devDependencies | minor | `1.15.3` -> `1.16.1` | [homepage](https://prettier.io), [source](https://togithub.com/prettier/prettier) |

---

### Release Notes

<details>
<summary>prettier/prettier</summary>

### [`v1.16.1`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#&#8203;1161)

[Compare Source](https://togithub.com/prettier/prettier/compare/1.16.0...1.16.1)

[diff](https://togithub.com/prettier/prettier/compare/1.16.0...1.16.1)

-   JavaScript: Do not format functions with arguments as react hooks ([#&#8203;5778] by [@&#8203;SimenB])

    The formatting added in Prettier 1.16 would format any function receiving an
    arrow function and an array literal to match React Hook's documentation.
    Prettier will now format this the same as before that change if the arrow
    function receives any arguments.

    <!-- prettier-ignore -->

    ```js
    // Input
    ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce(
      (allColors, color) => {
        return allColors.concat(color);
      },
      []
    );

    // Output (Prettier 1.16.0)
    ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce((
      allColors,
      color
    ) => {
      return allColors.concat(color);
    }, []);

    // Output (Prettier 1.16.1)
    ["red", "white", "blue", "black", "hotpink", "rebeccapurple"].reduce(
      (allColors, color) => {
        return allColors.concat(color);
      },
      []
    );
    ```

-   JavaScript: Add necessary parentheses for decorators ([#&#8203;5785] by [@&#8203;ikatyang])

    Parentheses for decorators with nested call expressions are optional for legacy decorators
    but they're required for decorators in the current [proposal](https://tc39.github.io/proposal-decorators/#sec-syntax).

    <!-- prettier-ignore -->

    ```js
    // Input
    class X {
      @&#8203;(computed().volatile())
      prop
    }

    // Output (Prettier 1.16.0)
    class X {
      @&#8203;computed().volatile()
      prop
    }

    // Output (Prettier 1.16.1)
    class X {
      @&#8203;(computed().volatile())
      prop
    }
    ```

-   TypeScript: Stable parentheses for function type in the return type of arrow function ([#&#8203;5790] by [@&#8203;ikatyang])

    There's a regression introduced in 1.16 that
    parentheses for function type in the return type of arrow function were kept adding/removing.
    Their parentheses are always printed now.

    <!-- prettier-ignore -->

    ```ts
    // Input
    const foo = (): (() => void) => (): void => null;
    const bar = (): () => void => (): void => null;

    // First Output (Prettier 1.16.0)
    const foo = (): () => void => (): void => null;
    const bar = (): (() => void) => (): void => null;

    // Second Output (Prettier 1.16.0)
    const foo = (): (() => void) => (): void => null;
    const bar = (): () => void => (): void => null;

    // Output (Prettier 1.16.1)
    const foo = (): (() => void) => (): void => null;
    const bar = (): (() => void) => (): void => null;
    ```

-   MDX: Correctly recognize inline JSX ([#&#8203;5783] by [@&#8203;ikatyang])

    Previously, some inline JSXs are wrongly recognized as block HTML/JSX,
    which causes unexpected behaviors. This issue is now fixed.

    <!-- prettier-ignore -->

    ```md
    <!-- Input -->
    _foo <InlineJSX /> bar_

    <!-- Output (Prettier 1.16.0) -->
    _foo

    <InlineJSX /> bar_

    <!-- Output (Prettier 1.16.1) -->
    _foo <InlineJSX /> bar_
    ```

[@&#8203;ikatyang]: https://togithub.com/ikatyang

[@&#8203;simenb]: https://togithub.com/SimenB

[#&#8203;5778]: https://togithub.com/prettier/prettier/pull/5778

[#&#8203;5783]: https://togithub.com/prettier/prettier/pull/5783

[#&#8203;5785]: https://togithub.com/prettier/prettier/pull/5785

[#&#8203;5790]: https://togithub.com/prettier/prettier/pull/5790

### [`v1.16.0`](https://togithub.com/prettier/prettier/blob/master/CHANGELOG.md#&#8203;1160)

[Compare Source](https://togithub.com/prettier/prettier/compare/1.15.3...1.16.0)

[diff](https://togithub.com/prettier/prettier/compare/1.15.3...1.16.0)

🔗 [Release Notes](https://prettier.io/blog/2019/01/20/1.16.0.html)

</details>

---

### Renovate configuration

📅 **Schedule**: "after 6pm every weekday,before 5am every weekday" in timezone America/Los_Angeles.

🚦 **Automerge**: Enabled.

♻️ **Rebasing**: Whenever PR is stale, or if you modify the PR title to begin with "`rebase!`".

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- renovate-rebase -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://togithub.com/marketplace/renovate). View repository job log [here](https://renovatebot.com/dashboard#apollographql/apollo-server).
2019-01-23 17:46:53 +02:00
Jesse Rosenberger
f045a4d0c9
Publish
- apollo-cache-control@0.5.0-alpha.2
 - apollo-datasource-rest@0.3.0-alpha.2
 - apollo-datasource@0.3.0-alpha.2
 - apollo-engine-reporting@0.3.0-alpha.2
 - apollo-server-azure-functions@2.4.0-alpha.3
 - apollo-server-cache-memcached@0.3.0-alpha.2
 - apollo-server-cache-redis@0.3.0-alpha.2
 - apollo-server-caching@0.3.0-alpha.2
 - apollo-server-cloud-functions@2.4.0-alpha.3
 - apollo-server-cloudflare@2.4.0-alpha.3
 - apollo-server-core@2.4.0-alpha.3
 - apollo-server-express@2.4.0-alpha.3
 - apollo-server-fastify@2.4.0-alpha.3
 - apollo-server-hapi@2.4.0-alpha.3
 - apollo-server-integration-testsuite@2.4.0-alpha.3
 - apollo-server-koa@2.4.0-alpha.3
 - apollo-server-lambda@2.4.0-alpha.3
 - apollo-server-micro@2.4.0-alpha.3
 - apollo-server-plugin-base@0.3.0-alpha.3
 - apollo-server-testing@2.4.0-alpha.3
 - apollo-server@2.4.0-alpha.3
 - apollo-tracing@0.5.0-alpha.2
 - graphql-extensions@0.5.0-alpha.3
2019-01-23 15:58:50 +02:00
Jesse Rosenberger
a550dfc549
Bump apollo-server-fastify to match last 2.4.0-alpha.x release.
This will cause the first release of `apollo-server-fastify` to land at
`2.4.0-alpha.3`.  (Hopefully.)
2019-01-23 15:53:59 +02:00
Remy
069110b353 feat(Fastify) Apollo server Fastify integration #626 (#1971)
* feat(fastify) Apollo Fastify server integration resolve #626

* feat(fastify) Use createHandler instead of applyMiddleware #626

* feat(fastify) Fix integration test for node 10 #626

* feat(fastify) Update README's with fastify createHandler interface #626

* feat(fastify) Implement the fastify createHandler as a synchronous method #626

* (fastify) Tweaks to re-align with the parallel work in #2054.

* (fastify): Use port 9999 rather than 8888 for tests.  Because Gatsby.

This specific port per integration is pretty brittle to begin with, but it
does work.  Currently, the fact that it works is facilitated by the fact
that most people don't use 5555 (Hapi) and 6666 (Express) for anything.

That said, the ever-popular Gatsby uses 8888 by default, so let's use 9999!

* (fastify) Remove duplicative assertion in upload initialization.

* (fastify) Implement fastify upload middleware

* (fastify) Fix linting issues

* (fastify) Update package-lock
2019-01-23 15:43:47 +02:00
Jesse Rosenberger
a14eddfdc5
Merge branch 'release-2.4.0' into HEAD 2019-01-23 15:15:11 +02:00
Jesse Rosenberger
7d5468800f
Merge pull request #2111 from apollographql/abernix/cache-parsed-validated
Cache successfully parsed and validated documents for future requests.
2019-01-23 15:09:56 +02:00
Jesse Rosenberger
1d0021933e
Publish
- apollo-server-azure-functions@2.4.0-alpha.2
 - apollo-server-cloud-functions@2.4.0-alpha.2
 - apollo-server-cloudflare@2.4.0-alpha.2
 - apollo-server-core@2.4.0-alpha.2
 - apollo-server-express@2.4.0-alpha.2
 - apollo-server-hapi@2.4.0-alpha.2
 - apollo-server-integration-testsuite@2.4.0-alpha.2
 - apollo-server-koa@2.4.0-alpha.2
 - apollo-server-lambda@2.4.0-alpha.2
 - apollo-server-micro@2.4.0-alpha.2
 - apollo-server-plugin-base@0.3.0-alpha.2
 - apollo-server-testing@2.4.0-alpha.2
 - apollo-server@2.4.0-alpha.2
 - graphql-extensions@0.5.0-alpha.2
2019-01-23 15:04:23 +02:00
Jesse Rosenberger
2ed1c0e074
Revert (as intended!) "[debug] Print out documentStore stats every 60 seconds."
This reverts commit 7a0d0e6e96, as I intended
when I originally introduced it.

Ref: https://github.com/apollographql/apollo-server/pull/2111#issuecomment-454779949
2019-01-23 14:56:50 +02:00
renovate[bot]
e2bfc62275
chore(deps): update dependency @types/express to v4.16.1 (#2211) 2019-01-23 09:26:52 +00:00
Fabian Schneider
06e49077d8 Fix cache policy calculation when a hint has maxAge 0 (#2197)
Fixes apollographql/apollo-cache-control#11.
2019-01-22 16:53:10 -05:00
renovate[bot]
6e2cc5a8c5
chore(deps): update dependency @apollographql/apollo-tools to ^0.3.0 (#2190) 2019-01-17 04:22:44 +00:00
Jesse Rosenberger
33d1f82814
Publish
- apollo-cache-control@0.5.0-alpha.1
 - apollo-datasource-rest@0.3.0-alpha.1
 - apollo-datasource@0.3.0-alpha.1
 - apollo-engine-reporting@0.3.0-alpha.1
 - apollo-server-azure-functions@2.4.0-alpha.1
 - apollo-server-cache-memcached@0.3.0-alpha.1
 - apollo-server-cache-redis@0.3.0-alpha.1
 - apollo-server-caching@0.3.0-alpha.1
 - apollo-server-cloud-functions@2.4.0-alpha.1
 - apollo-server-cloudflare@2.4.0-alpha.1
 - apollo-server-core@2.4.0-alpha.1
 - apollo-server-express@2.4.0-alpha.1
 - apollo-server-hapi@2.4.0-alpha.1
 - apollo-server-integration-testsuite@2.4.0-alpha.1
 - apollo-server-koa@2.4.0-alpha.1
 - apollo-server-lambda@2.4.0-alpha.1
 - apollo-server-micro@2.4.0-alpha.1
 - apollo-server-plugin-base@0.3.0-alpha.1
 - apollo-server-testing@2.4.0-alpha.1
 - apollo-server@2.4.0-alpha.1
 - apollo-tracing@0.5.0-alpha.1
 - graphql-extensions@0.5.0-alpha.1
2019-01-16 13:11:21 +02:00
Jesse Rosenberger
7a0d0e6e96
[debug] Print out documentStore stats every 60 seconds.
In an effort to see how effective this cache is in production during this
alpha phase, we'll print out the stats on the document store every 60
seconds.
2019-01-16 13:07:17 +02:00
Jesse Rosenberger
be7162094c
Shift the burden of object approximation into the ApolloServerBase class.
The implementation of object-size approximation which is used for cache
eviction purposes in the `InMemoryLRUCache` implementation (via `lru-cache`)
was a short-term location for extensible logic which is better located
within `ApolloServerBase`.

This is particularly important since future logic may necessitate knowing or
understanding the current size (roughly, memory usage) of the in-memory
storage.  Effective immediately, this adds support for providing a `dispose`
function which is called when an object is purged from the cache to make
room for another.
2019-01-16 12:46:48 +02:00
renovate[bot]
9d047ebb36
chore(deps): update dependency @types/graphql (#2187) 2019-01-16 04:30:31 +00:00
Jesse Rosenberger
0879a1267e
Be considerate of variable length utf-8 encodings in InMemoryLRUCache.
Previously, this used the `JSON.stringify` length, but this is slightly more
aware.
2019-01-15 17:45:20 +02:00
Jesse Rosenberger
1a9d65dd81
Guard against (currently impossible) failure to read from documentStore.
While the implementation of the `documentStore` is currently simple enough
to never throw (it is in-memory), it makes some sense to guard against future
extended functionality where an exception might be raised.

Since storing this object in a distributed memory store isn't currently
feasible, I'm not sure what such an exception would be right now, but I
don't mind being proactive!

Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247618501
2019-01-15 17:03:00 +02:00
Jesse Rosenberger
f546086e95
Fix typos/spacing in commentary.
Of my own making!
2019-01-15 17:03:00 +02:00
Jesse Rosenberger
2652057c33
Clarify comments surrounding documentStore, which led to confusion.
The parsed/validated cache store is on by default.  While it could be disabled,
in theory, it cannot be disabled since its an internal property of the
request pipeline processor class.

See confusion here:

  https://github.com/withspectrum/spectrum/pull/4533#issuecomment-453446535
2019-01-15 17:02:59 +02:00
Jesse Rosenberger
f33ae19f6d
Ensure requestContext.document set, irregardless of documentStore use.
Without this change, the `document` property was not set on the
`requestContext` for consumption by request pipeline plugins.

To further guard against this oversight, I've removed the extra `document`
variable which was being used as scoped state for the document and switched to
directly using (and assigning to) the `requestContext.document`.

Nice catch, @glasser!

Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247617469
2019-01-15 17:02:59 +02:00
Jesse Rosenberger
45f14a2971
Fix incorrect contraction in code comment, per feedback.
Ref: https://github.com/apollographql/apollo-server/pull/2111/files#r247616489
2019-01-15 17:02:58 +02:00
Jesse Rosenberger
ea7da3a38c
Merge branch 'master' into abernix/cache-parsed-validated 2019-01-14 20:39:36 +02:00
Remy Korrelboom
94e9a07cd2 (fastify) Fix linting issues 2019-01-02 14:24:57 +01:00
Remy Korrelboom
05158d3e0d (fastify) Implement fastify upload middleware 2019-01-02 14:24:57 +01:00
Jesse Rosenberger
59873843a8 (fastify) Remove duplicative assertion in upload initialization. 2019-01-02 14:24:56 +01:00
Jesse Rosenberger
99bf841220 (fastify): Use port 9999 rather than 8888 for tests. Because Gatsby.
This specific port per integration is pretty brittle to begin with, but it
does work.  Currently, the fact that it works is facilitated by the fact
that most people don't use 5555 (Hapi) and 6666 (Express) for anything.

That said, the ever-popular Gatsby uses 8888 by default, so let's use 9999!
2019-01-02 14:24:56 +01:00
Jesse Rosenberger
fa621c60bb (fastify) Tweaks to re-align with the parallel work in #2054. 2019-01-02 14:24:55 +01:00
Remy Korrelboom
482cdad6fa feat(fastify) Implement the fastify createHandler as a synchronous method #626 2019-01-02 14:24:49 +01:00
Remy Korrelboom
fb023a5d4c feat(fastify) Update README's with fastify createHandler interface #626 2019-01-02 14:24:48 +01:00
Remy Korrelboom
88ff16192f feat(fastify) Fix integration test for node 10 #626 2019-01-02 14:24:48 +01:00
Remy Korrelboom
a1d2b74c31 feat(fastify) Use createHandler instead of applyMiddleware #626 2019-01-02 14:24:47 +01:00
Remy Korrelboom
bacdeae80d feat(fastify) Apollo Fastify server integration resolve #626 2019-01-02 14:24:47 +01:00
wtgtybhertgeghgtwtg
ccba8c87da Switch json-stable-stringify to fast-json-stable-stringify. (#2065)
* refactor: switch `json-stable-stringify` to `fast-json-stable-stringify`

* chore: drop `@types/json-stable-stringify`

* Update CHANGELOG.md for #2065.
2018-12-19 20:06:17 +02:00
Jesse Rosenberger
7697623789
Publish
- apollo-cache-control@0.5.0-alpha.0
 - apollo-datasource-rest@0.3.0-alpha.0
 - apollo-datasource@0.3.0-alpha.0
 - apollo-engine-reporting@0.3.0-alpha.0
 - apollo-server-azure-functions@2.4.0-alpha.0
 - apollo-server-cache-memcached@0.3.0-alpha.0
 - apollo-server-cache-redis@0.3.0-alpha.0
 - apollo-server-caching@0.3.0-alpha.0
 - apollo-server-cloud-functions@2.4.0-alpha.0
 - apollo-server-cloudflare@2.4.0-alpha.0
 - apollo-server-core@2.4.0-alpha.0
 - apollo-server-express@2.4.0-alpha.0
 - apollo-server-hapi@2.4.0-alpha.0
 - apollo-server-integration-testsuite@2.4.0-alpha.0
 - apollo-server-koa@2.4.0-alpha.0
 - apollo-server-lambda@2.4.0-alpha.0
 - apollo-server-micro@2.4.0-alpha.0
 - apollo-server-plugin-base@0.3.0-alpha.0
 - apollo-server-testing@2.4.0-alpha.0
 - apollo-server@2.4.0-alpha.0
 - apollo-tracing@0.5.0-alpha.0
 - graphql-extensions@0.5.0-alpha.0
2018-12-18 17:14:02 +02:00
Jesse Rosenberger
b30e9332fc
Cache successfully parsed and validated documents for future requests.
WIP
2018-12-18 11:18:55 +02:00
Jesse Rosenberger
fa63116cd7
Merge branch 'master' into abernix/caching-tweak-prep-two 2018-12-18 11:13:26 +02:00
Jesse Rosenberger
2b50e149b0
caching: InMemoryLRUCache support for ttl, much like Redis/Memcached.
This also re-enables the Expiration tests for this library, though I think I
will continue to leave the testsuite decomposed into more granular methods
for readability and future growth.

Note that this doesn't implement the same default `300` second TTL as the
other Memcache and Redis implementations currently do (a very debatable
default we should re-consider in the future).
2018-12-18 10:55:38 +02:00
Jesse Rosenberger
098c893990
nit: Use the term value rather than data for Key + *Value* stores.
Super nitty, but they are KeyValue stores, not KeyData stores.
2018-12-18 10:55:37 +02:00
Jesse Rosenberger
c7f6b43234
tests: Change apollo-server-caching test-suite to support InMemoryLRUCache. 2018-12-18 10:55:36 +02:00
Jesse Rosenberger
d53f361c54
cache: Implement flush method for InMemoryLRUCache.
This implements the `flush` method, which is currently supported by both
Memcached and Redis, into the `InMemoryLRUCCache` cache.
2018-12-18 10:55:36 +02:00
Jesse Rosenberger
f3981b76a4
Adjust InMemoryLRUCache to allow non-string values via generics.
While it is certainly our current implementation, I'm not sure that the true
spirit of an in-memory key-value store is to only map strings to other strings.

While enforcing `<string, string>` might be necessary for some distributed
cache stores, it seems we shouldn't enforce it for `InMemoryLRUCache`.

By changing the `KeyValueCache` to default to `string` but allow other
options, we can allow the user to decide exactly how the RHS of this store
should be typed.

This does require a bit more flexible implementation of the `length`
calculator which is used for cache ejection, but that implementation will
become immediately useful when we start storing parsed ASTs in this KV store.
2018-12-18 10:55:35 +02:00