- Add a new kind of control behavior `warm up + rate limiter`, behaving as both warm up and pace control

- Receiving "No metrics" response won't cause error log
- Improve log about fetching metrics

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Rename AbstractSentinelAspect to AbstractSentinelAspectSupport

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Decouple rule checking from controller (now in service)

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Avoid ConcurrentModificationException when `getMachines()` by deep clone the machine map
- Enhance the code to avoid potential ConcurrentModificationException
- Add test cases

- Enhance rule checking in rule managers and Sentinel Dashboard frontend
- Enhance error information when reporting invalid fields in rule dialog

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Enhance resolve name logic in MethodUtil
- Add test case for MethodUtil

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Change log file name;
- Add configurability to log file name and metric file name.

- Update dashboard API client to support authority rule commands
- Add REST API and frontend page for authority rules

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Do a manual copying from unpooled direct buffer.

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

update nacos version to 0.2.1.  change default port. 8080 -> 8848. fix port conflict.

* sentinel-transport-netty-http will also retry when port specified has been used
* LogBase support variable arguments
* Remove duplicated JVM properties overriding in SentinelConfig
* Add VersionUtil to get version from jar

Fixes #22 (by @jasonjoo2010)

- Update dashboard API client to support authority and parameter flow commands
- Add REST API controller for parameter flow rules in dashboard
- Add pages for configuring parameter flow rules
- Update dependencies: upgrade Spring Boot to 2.x and remove unused dependencies
- Other refinements

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

* Add a new DegradeRule type, degrade by exception count in the last 60 seconds
* Add demo about degrading by exception count

normalize metric fields and methods:
- rename exception to exceptionQps;
- remove ed postfix of all fields and methods about metrics;

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Carpenter Lee <hooleeucas@163.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

- Add callback registry for statistic slot for extensions.
- Add a new module `sentinel-parameter-flow-control` under `sentinel-extension`.
- Add a `CacheMap` interface to provide abstraction for cache. We use ConcurrentLinkedHashMap as the default implementation (LRU strategy)..
- Add a `ParameterMetric` class as frequent parameter metrics for a specific resource. The metric map is located in `ParamFlowSlot` rather than `ClusterNode`.
- Implement `ParameterLeapArray` as statistic data structure for frequent parameters in a period of time window.
- Add `ParamFlowSlot` as the checker slot; Add `ParamFlowChecker` to do rule checking; Add `ParamFlowRuleManager` to do rule managing.
- The statistic metrics for frequent parameters is enabled only if the related resource has configured parameter flow rule; Parameter metrics for removed rules will be cleared automatically.
- Leverage extensible `SlotChainBuilder` to provide a `HotParamSlotChainBuilder`.
- Add command handlers for hot param rules.
- Add test cases and demo.

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

Signed-off-by: Eric Zhao <sczyh16@gmail.com>