Commit Graph

87 Commits

Author SHA1 Message Date
Daniel Nephin 09d62f1df0 lib/ttlcache: unexport key and additional godoc 2020-10-20 19:16:03 -04:00
Daniel Nephin 2601998766 lib/ttlcache: add a constant for NotIndexed 2020-10-20 19:10:20 -04:00
Daniel Nephin 0beaced90f cache: fix a bug with Prepopulate
Prepopulate was setting entry.Expiry.HeapIndex to 0. Previously this would result in a call to heap.Fix(0)
which wasn't correct, but was also not really a problem because at worse it would re-notify.

With the recent change to extract cachettl it was changed to call Update(idx), which would have updated
the wrong entry.

A previous commit removed the setting of entry.Expiry so that the HeapIndex would be reported
as -1, and this commit adds a test and handles the -1 heap index.
2020-10-20 19:10:20 -04:00
Daniel Nephin 9d5b738cdb lib/ttlcache: extract package from agent/cache 2020-10-20 19:10:20 -04:00
Daniel Nephin 909b8e674e cache: export ExpiryHeap
and hide internal methods on an unexported type, so that when it is extrated those methods are not exported.
2020-10-20 19:10:20 -04:00
Daniel Nephin d3742a1d0e cache: Refactor heap.notify to make it more explicit.
And remove duplicate notifications.

Instead of performing the check in the heap implementation, check the
index in the higher level interface (Add,Remove,Update) and notify if one
of the relevant indexes is 0.
2020-10-20 19:10:20 -04:00
Daniel Nephin a96646c562 cache: Move more of the expiryLoop into the Heap 2020-10-20 19:10:20 -04:00
Daniel Nephin b6f24c6554 cache: extract cache eviction heap
Start creating an interface that doesn't require using heap and hides more of the
entry internals.
2020-10-20 19:10:19 -04:00
Daniel Nephin f857aef4a8 submatview: add a test for handling of NewSnapshotToFollow
Also add some godoc
Rename some vars and functions
Fix a data race in the new cache test for entry closing.
2020-10-06 13:22:02 -04:00
Daniel Nephin 50846a96ff cache-types: Update Streaming health cache-type
To use latest protobuf types
2020-10-06 13:22:02 -04:00
Daniel Nephin e5d37bdf23 agent/cache: Add cache-type and materialized view for streaming health
Extracted from d97412ce4c399a35b41bbdae2716f0e32dce80bf

Co-authored-by: Paul Banks <banks@banksco.de>
2020-10-06 13:21:57 -04:00
Daniel Nephin 845661c8af
Merge pull request #8548 from edevil/fix_flake
Fix flaky TestACLResolver_Client/Concurrent-Token-Resolve
2020-08-28 15:10:55 -04:00
Pierre Souchay ee50b55163 Added Unit test for cache reloading 2020-08-28 13:03:58 +02:00
Pierre Souchay 084d0e8015 Added `options.Equals()` and minor fixes indentation fixes 2020-08-27 13:44:45 +02:00
Pierre Souchay dd385f05e6 Ensure that Cache options are reloaded when `consul reload` is performed.
This will apply cache throttling parameters are properly applied:
 * cache.EntryFetchMaxBurst
 * cache.EntryFetchRate

When values are updated, a log is displayed in info.
2020-08-24 23:33:10 +02:00
André Cruz 673bd69f36
Decrease test flakiness
Fix flaky TestACLResolver_Client/Concurrent-Token-Resolve and TestCacheNotifyPolling
2020-08-24 20:30:02 +01:00
Hans Hasselberg ffdc3057fe
agent/cache test for cache throttling. (#8396) 2020-07-30 14:41:13 +02:00
Matt Keeler 2ec4e46eb2
Default Cache rate limiting options in New
Also get rid of the TestCache helper which was where these defaults were happening previously.
2020-07-28 12:34:35 -04:00
Pierre Souchay 947d8eb039
Added ratelimit to handle throtling cache (#8226)
This implements a solution for #7863

It does:

    Add a new config cache.entry_fetch_rate to limit the number of calls/s for a given cache entry, default value = rate.Inf
    Add cache.entry_fetch_max_burst size of rate limit (default value = 2)

The new configuration now supports the following syntax for instance to allow 1 query every 3s:

    command line HCL: -hcl 'cache = { entry_fetch_rate = 0.333}'
    in JSON

{
  "cache": {
    "entry_fetch_rate": 0.333
  }
}
2020-07-27 23:11:11 +02:00
Matt Keeler 6d94900cd7
Disable background cache refresh for Connect Leaf Certs
The rationale behind removing them is that all of our own code (xDS, builtin connect proxy) use the cache notification mechanism. This ensures that the blocking fetch behind the scenes is always executing. Therefore the only way you might go to get a certificate and have to wait is when 1) the request has never been made for that cert before or 2) you are using the v1/agent/connect/ca/leaf API for retrieving the cert yourself.

In the first case, the refresh change doesn’t alter the behavior. In the second case, it can be mitigated by using blocking queries with that API which just like normal cache notification mechanism will cause the blocking fetch to be initiated and to get leaf certs as soon as needed.

If you are not using blocking queries, or Envoy/xDS, or the builtin connect proxy but are retrieving the certs yourself then the HTTP endpoint might take a little longer to respond.

This also renames the RefreshTimeout field on the register options to QueryTimeout to more accurately reflect that it is used for any type that supports blocking queries.
2020-07-21 12:19:25 -04:00
Daniel Nephin 797abe1f00 agent/cache: Use AllowNotModifiedResponse in CatalogListServices
Co-authored-by: Pierre Souchay <pierresouchay@users.noreply.github.com>
2020-07-14 18:58:20 -04:00
Daniel Nephin 8aa3335b22 agent/cache: Update some docstrings 2020-07-14 18:58:20 -04:00
Matt Keeler 976f922abf
Make the Agent Cache more Context aware (#8092)
Blocking queries issues will still be uncancellable (that cannot be helped until we get rid of net/rpc). However this makes it so that if calling getWithIndex (like during a cache Notify go routine) we can cancell the outer routine. Previously it would keep issuing more blocking queries until the result state actually changed.
2020-06-15 11:01:25 -04:00
Daniel Nephin 3114943f8d agent/cache: remove error return from fetch
A previous change removed the only error, so the return value can be
removed now.
2020-04-17 11:55:01 -04:00
Daniel Nephin d015d3c563 agent/cache: reduce function arguments by removing duplicates
A few of the unexported functions in agent/cache took a large number of
arguments. These arguments were effectively overrides for values that
were provided in RequestInfo.

By using a struct we can not only reduce the number of arguments, but
also simplify the logic by removing the need for overrides.
2020-04-17 11:35:07 -04:00
Daniel Nephin 1251c01b73 agent/cache: Make all cache options RegisterOptions
Previously the SupportsBlocking option was specified by a method on the
type, and all the other options were specified from RegisterOptions.

This change moves RegisterOptions to a method on the type, and moves
SupportsBlocking into the options struct.

Currently there are only 2 cache-types. So all cache-types can implement
this method by embedding a struct with those predefined values. In the
future if a cache type needs to be registered more than once with different
options it can remove the embedded type and implement the method in a way
that allows for paramaterization.
2020-04-16 18:56:34 -04:00
Daniel Nephin fb31212de7 Remove TTL from cacheEntryExpiry
This should very slightly reduce the amount of memory required to store each item in
the cache.

It will also enable setting different TTLs based on the type of result. For example
we may want to use a shorter TTL when the result indicates the resource does not exist,
as storing these types of records could easily lead to a DOS caused by
OOM.
2020-04-13 13:10:38 -04:00
Daniel Nephin 371cf05340 agent/cache: Reduce differences between notify implementations
These two notify functions are very similar. There appear to be just
enough differences that trying to parameterize the differences may not
improve things.

For now, reduce some of the cosmetic differences so that the material
differences are more obvious.
2020-04-13 13:10:38 -04:00
Daniel Nephin 4d398d26ae agent/cache: Inline the refresh function to make recursion more obvious
fetch is already an exceptionally long function, but hiding the
recrusion in a function call likely does not help.
2020-04-13 13:10:38 -04:00
Daniel Nephin 98ef66e70a agent/cache: Make the return values of getEntryLocked more obvious
Use named returned so that the caller has a better idea of what these
bools mean.

Return early to reduce the scope, and make it more obvious what values
are returned in which cases. Also reduces the number of conditional
expressions in each case.
2020-04-13 13:10:38 -04:00
Daniel Nephin cef60d1547 agent/cache: Small formatting improvements to improve readability
Remove Cache.entryKey which called a single function.
Format multiline struct creation one field per line.
2020-04-13 12:34:11 -04:00
Daniel Nephin bf2a6452f1
Merge pull request #7596 from hashicorp/dnephin/agent-cache-type-entry
agent/cache: move typeEntry lookup to the edge
2020-04-13 12:24:07 -04:00
Daniel Nephin ab068325da agent/cache: move typeEntry lookup to the edge
This change moves all the typeEntry lookups to the first step in the exported methods,
and makes unexporter internals accept the typeEntry struct.

This change is primarily intended to make it easier to extract the container of caches
from the Cache type.

It may incidentally reduce locking in fetch, but that was not a goal.
2020-04-03 16:01:56 -04:00
Pierre Souchay 984583d980
tests: more tolerance to latency for unstable test `TestCacheNotifyPolling()`. (#7574) 2020-04-03 10:29:38 +02:00
R.B. Boyer 0e152672a1
avoid 'panic: Log in goroutine after TestCacheGet_refreshAge has completed' (#7276) 2020-02-12 10:01:51 -06:00
Anthony Scalisi 4b92c2deee fix spelling errors (#7135) 2020-01-27 07:00:33 -06:00
R.B. Boyer 55fdae203f
agent: cache notifications work after error if the underlying RPC returns index=1 (#6547)
Fixes #6521

Ensure that initial failures to fetch an agent cache entry using the
notify API where the underlying RPC returns a synthetic index of 1
correctly recovers when those RPCs resume working.

The bug in the Cache.notifyBlockingQuery used to incorrectly "fix" the
index for the next query from 0 to 1 for all queries, when it should
have not done so for queries that errored.

Also fixed some things that made debugging difficult:

- config entry read/list endpoints send back QueryMeta headers
- xds event loops don't swallow the cache notification errors
2019-09-26 10:42:17 -05:00
Christian Muehlhaeuser 2602f6907e Simplified code in various places (#6176)
All these changes should have no side-effects or change behavior:

- Use bytes.Buffer's String() instead of a conversion
- Use time.Since and time.Until where fitting
- Drop unnecessary returns and assignment
2019-07-20 09:37:19 -04:00
Freddy a295d9e5db
Flaky test overhaul (#6100) 2019-07-12 09:52:26 -06:00
Hans Hasselberg 73c4e9f07c
tls: auto_encrypt enables automatic RPC cert provisioning for consul clients (#5597) 2019-06-27 22:22:07 +02:00
Matt Keeler 07f2854683 Fixes race condition in Agent Cache (#5796)
* Fix race condition during a cache get

Check the entry we pulled out of the cache while holding the lock had Fetching set.
If it did then we should use the existing Waiter instead of calling fetch. The reason
this is better than just calling fetch is that fetch re-gets the entry out of the
entries map and the previous fetch may have finished. Therefore this prevents
erroneously starting a new fetch because we just missed the last update.

* Fix race condition fully

The first commit still allowed for the following scenario:

• No entry existing when checked in getWithIndex while holding the read lock
• Then by time we had reached fetch it had been created and finished.

* always use ok when returning

* comment mentioning the reading from entries.

* use cacheHit consistently
2019-05-07 11:15:49 +01:00
Kyle Havlovitz a113d8ca1f Test an index=0 value in cache.Notify 2019-04-25 02:11:07 -07:00
Kyle Havlovitz 1fc96c770b Make central service config opt-in and rework the initial registration 2019-04-24 06:11:08 -07:00
R.B. Boyer 91e78e00c7
fix typos reported by golangci-lint:misspell (#5434) 2019-03-06 11:13:28 -06:00
Paul Banks 1c4dfbcd2e
connect: tame thundering herd of CSRs on CA rotation (#5228)
* Support rate limiting and concurrency limiting CSR requests on servers; handle CA rotations gracefully with jitter and backoff-on-rate-limit in client

* Add CSR rate limiting docs

* Fix config naming and add tests for new CA configs
2019-01-22 17:19:36 +00:00
Matt Keeler 8e54856c46
Implement prepared query upstreams watching for envoy (#5224)
Fixes #4969 

This implements non-blocking request polling at the cache layer which is currently only used for prepared queries. Additionally this enables the proxycfg manager to poll prepared queries for use in envoy proxy upstreams.
2019-01-18 12:44:04 -05:00
Paul Banks c4fa66b4c9
connect: agent leaf cert caching improvements (#5091)
* Add State storage and LastResult argument into Cache so that cache.Types can safely store additional data that is eventually expired.

* New Leaf cache type working and basic tests passing. TODO: more extensive testing for the Root change jitter across blocking requests, test concurrent fetches for different leaves interact nicely with rootsWatcher.

* Add multi-client and delayed rotation tests.

* Typos and cleanup error handling in roots watch

* Add comment about how the FetchResult can be used and change ca leaf state to use a non-pointer state.

* Plumb test override of root CA jitter through TestAgent so that tests are deterministic again!

* Fix failing config test
2019-01-10 12:46:11 +00:00
Paul Banks 1bf3a37597
agent: Don't leave old errors around in cache (#5094)
* Fixes #4480. Don't leave old errors around in cache that can be hit in specific circumstances.

* Move error reset to cover extreme edge case of nil Value, nil err Fetch
2019-01-08 10:06:38 +00:00
Paul Banks bf741cbc04
Quick fix for cache age flakiness in CI 2018-10-11 13:12:19 +01:00
Paul Banks 0523efa2fe merge feedback: fix typos; actually use deliverLatest added previously but not plumbed in 2018-10-10 16:55:34 +01:00