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38 Commits

Author SHA1 Message Date
Paul Banks c9217c958e merge feedback: fix typos; actually use deliverLatest added previously but not plumbed in 2018-10-10 16:55:34 +01:00
Paul Banks 96b9b95a19 Add cache.Notify to abstract watching for cache updates for types that support blocking semantics. (#4695) 2018-10-10 16:55:34 +01:00
Paul Banks 88388d760d Support Agent Caching for Service Discovery Results (#4541) 
* Add cache types for catalog/services and health/services and basic test that caching works

* Support non-blocking cache types with Cache-Control semantics.

* Update API docs to include caching info for every endpoint.

* Comment updates per PR feedback.

* Add note on caching to the 10,000 foot view on the architecture page to make the new data path more clear.

* Document prepared query staleness quirk and force all background requests to AllowStale so we can spread service discovery load across servers.
 2018-10-10 16:55:34 +01:00
Paul Banks e8ba527f23
Add a Close method to cache that stops background goroutines. (#4746) 
In a real agent the `cache` instance is alive until the agent shuts down so this is not a real leak in production, however in out test suite, every testAgent that is started and stops leaks goroutines that never get cleaned up which accumulate consuming CPU and memory through subsequent test in the `agent` package which doesn't help our test flakiness.

This adds a Close method that doesn't invalidate or clean up the cache, and still allows concurrent blocking queries to run (for up to 10 mins which might still affect tests). But at least it doesn't maintain them forever with background refresh and an expiry watcher routine.

It would be nice to cancel any outstanding blocking requests as well when we close but that requires much more invasive surgery right into our RPC protocol since we don't have a way to cancel requests currently.

Unscientifically this seems to make tests pass a bit quicker and more reliably locally but I can't really be sure of that!
 2018-10-04 11:27:11 +01:00
Paul Banks 8cbeb29e73
Fixes #4421: General solution to stop blocking queries with index 0 (#4437) 
* Fix theoretical cache collision bug if/when we use more cache types with same result type

* Generalized fix for blocking query handling when state store methods return zero index

* Refactor test retry to only affect CI

* Undo make file merge

* Add hint to error message returned to end-user requests if Connect is not enabled when they try to request cert

* Explicit error for Roots endpoint if connect is disabled

* Fix tests that were asserting old behaviour
 2018-07-25 20:26:27 +01:00
Paul Banks 2e223ea2b7 Fix hot loop in cache for RPC returning zero index. 2018-06-25 12:25:37 -07:00
Paul Banks 43b48bc06b Get agent cache tests passing without global hit count (which is racy). 
Few other fixes in here just to get a clean run locally - they are all also fixed in other PRs but shouldn't conflict.

This should be robust to timing between goroutines now.
 2018-06-25 12:25:37 -07:00
Mitchell Hashimoto 6b1e0a3003 agent/cache: always schedule the refresh 2018-06-25 12:25:14 -07:00
Mitchell Hashimoto cf9b377c78 agent/cache: always fetch with minimum index of 1 at least 2018-06-25 12:25:12 -07:00
Mitchell Hashimoto 6b745964c4 agent/cache: update comment from PR review to clarify 2018-06-25 12:24:08 -07:00
Mitchell Hashimoto d609ad216b agent/cache: update comments 2018-06-25 12:24:07 -07:00
Mitchell Hashimoto 839d3c323d agent/cache: correct test name 2018-06-25 12:24:07 -07:00
Mitchell Hashimoto 45e49f31de agent/cache: change behavior to return error rather than retry 
The cache behavior should not be to mask errors and retry. Instead, it
should aim to return errors as quickly as possible. We do that here.
 2018-06-25 12:24:07 -07:00
Mitchell Hashimoto 311d503fb0 agent/cache: perform backoffs on error retries on blocking queries 2018-06-25 12:24:06 -07:00
Paul Banks 1722734313
Verify trust domain on /authorize calls 2018-06-14 09:42:16 -07:00
Mitchell Hashimoto 4f3b5647e5
agent/cache: change uint8 to uint 2018-06-14 09:42:15 -07:00
Mitchell Hashimoto fc5508f8a3
agent/cache: string through attempt rather than storing on the entry 2018-06-14 09:42:15 -07:00
Mitchell Hashimoto cfcd733609
agent/cache: implement refresh backoff 2018-06-14 09:42:14 -07:00
Mitchell Hashimoto bd3b8e042a
agent/cache: address PR feedback, lots of typos 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 02b20a0353
agent/cache: address feedback, clarify comments 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto af1d70b026
agent/cache: don't every block on NotifyCh 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 724b829104
agent/cache: unit tests for ExpiryHeap, found a bug! 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 194b256861
agent/cache: send the total entries count on eviction to go-metrics 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto e0d964188c
agent/cache: make edge case with prev/next idx == 0 handled better 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 3b550d2b72
agent/cache: rework how expiry data is stored to be more efficient 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 595193a781
agent/cache: initial TTL work 2018-06-14 09:42:02 -07:00
Mitchell Hashimoto 1df99514ca
agent/cache: send the RefreshTimeout into the backend fetch 2018-06-14 09:42:02 -07:00
Mitchell Hashimoto db4c47df27
agent/cache: on error, return from Get immediately, don't block forever 2018-06-14 09:42:02 -07:00
Mitchell Hashimoto cc2c98f961
agent/cache: lots of comment/doc updates 2018-06-14 09:42:02 -07:00
Mitchell Hashimoto e1c1b8812a
agent/cache: return the error as part of Get 2018-06-14 09:42:01 -07:00
Mitchell Hashimoto 00e7ab3cd5
agent/cache: integrate go-metrics so the cache is debuggable 2018-06-14 09:42:01 -07:00
Mitchell Hashimoto fcb15e15ae
agent/cache: support timeouts for cache reads and empty fetch results 2018-06-14 09:42:01 -07:00
Mitchell Hashimoto 917a9e63d5
agent: check cache hit count to verify CA root caching, background update 2018-06-14 09:42:00 -07:00
Mitchell Hashimoto c329b4cb34
agent/cache: partition by DC/ACL token 2018-06-14 09:42:00 -07:00
Mitchell Hashimoto e3c1162881
agent/cache: Reorganize some files, RequestInfo struct, prepare for partitioning 2018-06-14 09:42:00 -07:00
Mitchell Hashimoto b0db5657c4
agent/cache: ConnectCA roots caching type 2018-06-14 09:42:00 -07:00
Mitchell Hashimoto 975be337a9
agent/cache: blank cache key means to always fetch 2018-06-14 09:42:00 -07:00
Mitchell Hashimoto 1cfb0f1922
agent/cache: initial kind-of working cache 2018-06-14 09:42:00 -07:00