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path: root/modules/caddyhttp/reverseproxy/healthchecks.go
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2020-05-01reverseproxy: Remove circuitbreaker module (see #3331)Matthew Holt
Moving to https://github.com/caddyserver/circuitbreaker Nobody was using it anyway -- it works well, but something got fumbled in a refactoring *months* ago. Turns out that we forgot the interface guards AND botched a method name (my bad) - Ok() should have been OK(). So it would always have thrown a runtime panic if it tried to be loaded. The module itself works well, but obviously nobody used it because nobody reported the error. Fixing this while we move it to the new repo. Removing this removes the last Bazaar/Launchpad dependency (I think).
2020-02-23reverse_proxy: Health checks: Don't cross the streamsMatthew Holt
Fixes https://caddy.community/t/v2-health-checks-are-going-to-the-wrong-upstream/7084?u=matt ... I think
2020-01-09http: Change routes to sequential matcher evaluation (#2967)Matt Holt
Previously, all matchers in a route would be evaluated before any handlers were executed, and a composite route of the matching routes would be created. This made rewrites especially tricky, since the only way to defer later matchers' evaluation was to wrap them in a subroute, or to invoke a "rehandle" which often caused bugs. Instead, this new sequential design evaluates each route's matchers then its handlers in lock-step; matcher-handlers-matcher-handlers... If the first matching route consists of a rewrite, then the second route will be evaluated against the rewritten request, rather than the original one, and so on. This should do away with any need for rehandling. I've also taken this opportunity to avoid adding new values to the request context in the handler chain, as this creates a copy of the Request struct, which may possibly lead to bugs like it has in the past (see PR #1542, PR #1481, and maybe issue #2463). We now add all the expected context values in the top-level handler at the server, then any new values can be added to the variable table via the VarsCtxKey context key, or just the GetVar/SetVar functions. In particular, we are using this facility to convey dial information in the reverse proxy. Had to be careful in one place as the middleware compilation logic has changed, and moved a bit. We no longer compile a middleware chain per- request; instead, we can compile it at provision-time, and defer only the evaluation of matchers to request-time, which should slightly improve performance. Doing this, however, we take advantage of multiple function closures, and we also changed the use of HandlerFunc (function pointer) to Handler (interface)... this led to a situation where, if we aren't careful, allows one request routed a certain way to permanently change the "next" handler for all/most other requests! We avoid this by making a copy of the interface value (which is a lightweight pointer copy) and using exclusively that within our wrapped handlers. This way, the original stack frame is preserved in a "read-only" fashion. The comments in the code describe this phenomenon. This may very well be a breaking change for some configurations, however I do not expect it to impact many people. I will make it clear in the release notes that this change has occurred.
2019-12-23Improve godocs all aroundMatthew Holt
These will be used in the new automated documentation system
2019-12-06Use "IsUnixNetwork" function instead of repeating the logicMatthew Holt
2019-11-11core: Use port ranges to avoid OOM with bad inputs (#2859)Mohammed Al Sahaf
* fix OOM issue caught by fuzzing * use ParsedAddress as the struct name for the result of ParseNetworkAddress * simplify code using the ParsedAddress type * minor cleanups
2019-10-29reverse_proxy: Structured logsMatthew Holt
2019-10-11reverse_proxy: Allow dynamic backends (closes #990 and #1539)Matthew Holt
This PR enables the use of placeholders in an upstream's Dial address. A Dial address must represent precisely one socket after replacements. See also #998 and #1639.
2019-10-04reverse_proxy: Configurable request headers on active health checksMatthew Holt
See https://caddy.community/t/health-check-user-agent/6309
2019-09-14reverse_proxy: Ability to mutate headers; set upstream placeholdersMatthew Holt
2019-09-05Reconcile upstream dial addresses and request host/URL informationMatthew Holt
My goodness that was complicated Blessed be request.Context Sort of
2019-09-03Integrate circuit breaker modules with reverse proxyMatthew Holt
2019-09-03Some cleanup and godocMatthew Holt
2019-09-03reverse_proxy: Implement active health checksMatthew Holt