refactor: remove duplicated code (#906)

* move server definition to package protocols

* refactor: folder structure for proxies

* refactor load balancer (WIP)

* continue refactor load balancer

* refactor load balance complete.

* fix tests

* refactor request matcher

* fix bugs

* add RealIP to Request interface

* move StringMatcher to package stringtool

* remove some redundant code

* Apply suggestions from code review

Co-authored-by: Groot <[email protected]>

* Update pkg/object/grpcserver/spec.go

Co-authored-by: su chen <[email protected]>

---------

Co-authored-by: Groot <[email protected]>
Co-authored-by: su chen <[email protected]>

doc/reference/filters.md

@@ -58,15 +58,15 @@
  - [DataBuilder](#databuilder)
  - [Configuration](#configuration-18)
  - [Results](#results-18)
- - [OIDCAdaptor](#OIDCAdaptor)
+ - [OIDCAdaptor](#oidcadaptor)
  - [Configuration](#configuration-19)
  - [Results](#results-19)
- - [OPAFilter](#OPAFilter)
+ - [OPAFilter](#opafilter)
  - [Configuration](#configuration-20)
- - [Results](#results-20) 
- - [Redirector](#Redirector)
+ - [Results](#results-20)
+ - [Redirector](#redirector)
  - [Configuration](#configuration-21)
- - [Results](#results-21) 
+ - [Results](#results-21)
  - [Common Types](#common-types)
  - [pathadaptor.Spec](#pathadaptorspec)
  - [pathadaptor.RegexpReplace](#pathadaptorregexpreplace)
@@ -75,9 +75,10 @@
  - [proxy.Server](#proxyserver)
  - [proxy.LoadBalanceSpec](#proxyloadbalancespec)
  - [proxy.StickySessionSpec](#proxystickysessionspec)
+ - [proxy.HealthCheckSpec](#proxyhealthcheckspec)
  - [proxy.MemoryCacheSpec](#proxymemorycachespec)
  - [proxy.RequestMatcherSpec](#proxyrequestmatcherspec)
- - [proxy.StringMatcher](#proxystringmatcher)
+ - [StringMatcher](#stringmatcher)
  - [proxy.MethodAndURLMatcher](#proxymethodandurlmatcher)
  - [urlrule.URLRule](#urlruleurlrule)
  - [proxy.Compression](#proxycompression)
@@ -88,6 +89,8 @@
  - [ratelimiter.Policy](#ratelimiterpolicy)
  - [httpheader.ValueValidator](#httpheadervaluevalidator)
  - [validator.JWTValidatorSpec](#validatorjwtvalidatorspec)
+ - [validator.BasicAuthValidatorSpec](#validatorbasicauthvalidatorspec)
+ - [basicAuth.LDAPSpec](#basicauthldapspec)
  - [signer.Spec](#signerspec)
  - [signer.HeaderHoisting](#signerheaderhoisting)
  - [signer.Literal](#signerliteral)
@@ -1402,13 +1405,13 @@ Polices:
 | Name | Type | Description | Required |
 | ---- | ---- | ----------- | -------- |
 ｜ policy | string | Policy used to match requests, support `general`, `ipHash`, `headerHash`, `random` | No |
-| headers | map[string][proxy.StringMatcher](#proxystringmatcher) | Request header filter options. The key of this map is header name, and the value of this map is header value match criteria | No |
+| headers | map[string][StringMatcher](#stringmatcher) | Request header filter options. The key of this map is header name, and the value of this map is header value match criteria | No |
 | urls | [][proxy.MethodAndURLMatcher](#proxyMethodAndURLMatcher) | Request URL match criteria | No |
 | permil | uint32 | the probability of requests been matched. Value between 0 to 1000 | No |
 | matchAllHeaders | bool | All rules in headers should be match | No |
 | headerHashKey | string | Used by policy `headerHash`. | No |
 
-### proxy.StringMatcher
+### StringMatcher
 
 The relationship between `exact`, `prefix`, and `regex` is `OR`.
 
@@ -1426,7 +1429,7 @@ The relationship between `methods` and `url` is `AND`.
 | Name | Type | Description | Required |
 | ------- | ------------------------------------------ | ---------------------------------------------------------------- | -------- |
 | methods | []string | HTTP method criteria, Default is an empty list means all methods | No |
-| url | [proxy.StringMatcher](#proxystringmatcher) | Criteria to match a URL | Yes |
+| url | [StringMatcher](#stringmatcher) | Criteria to match a URL | Yes |
 
 ### urlrule.URLRule
 
@@ -1435,7 +1438,7 @@ The relationship between `methods` and `url` is `AND`.
 | Name | Type | Description | Required |
 | --------- | ------------------------------------------ | ---------------------------------------------------------------- | -------- |
 | methods | []string | HTTP method criteria, Default is an empty list means all methods | No |
-| url | [urlrule.StringMatch](#urlruleStringMatch) | Criteria to match a URL | Yes |
+| url | [StringMatcher](#StringMatcher) | Criteria to match a URL | Yes |
 | policyRef | string | Name of resilience policy for matched requests | No |
 
 
@@ -1480,7 +1483,7 @@ The relationship between `methods` and `url` is `AND`.
 | path | string | Path match criteria, if request path is the value of this option, then the response of the request is mocked according to this rule | No |
 | pathPrefix | string | Path prefix match criteria, if request path begins with the value of this option, then the response of the request is mocked according to this rule | No |
 | matchAllHeaders | bool | Whether to match all headers | No |
-| headers | map[string][url.StringMatch](#urlrulestringmatch) | Headers to match, key is a header name, value is the rule to match the header value | No |
+| headers | map[string][StringMatcher](#stringmatcher) | Headers to match, key is a header name, value is the rule to match the header value | No |
 
 
 ### ratelimiter.Policy