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用例：缓存用户权限
在此用例中，必须从外部 Web 服务中检索用户权限（“GOLD”、“SILVER”等）。
要实现此用例，请执行以下操作
创建 HTTP 标注以从外部 Web 服务获取用户权限。
add policy httpcallout <name> [-IPAddress <ip_addr|ipv6_addr>] [-port <port>] [-vServer <string>] [-returnType <returnType>] [-httpMethod (GET | POST )] [-hostExpr <string>] [-urlStemExpr <string>] [-headers <name(value)> ...] [-parameters <name(value)> ...] [-bodyExpr <string>][-fullReqExpr <string>] [-scheme ( http | https )] [-resultExpr <string>] [-cacheForSecs <secs>] [-comment <string>]
add policy httpcallout get_user_privilege -ipaddress 10.217.193.84 -port 80 -returnType text -httpMethod GET -hostExpr '"/get_user_privilege"' -resultExpr 'http.res.body(5)'
<!--NeedCopy-->
将权限存储在变量中。
add ns variable <name> -type <string> [-scope ( global | transaction )][-ifFull ( undef | lru )] [-ifValueTooBig ( undef | truncate )][-ifNoValue ( undef | init )] [-init <string>] [-expires <positive_integer>] [-comment <string>]
add ns variable user_privilege_map -type map(text(15),text(10),10000) -expires 1200
add ns assignment set_user_privilege -variable $user_privilege_map[client.ip.src] -set sys.http_callout(get_user_privilege)
<!--NeedCopy-->
创建策略以检查客户端 IP 地址是否已缓存条目；如果没有，则调用 HTTP callout 为客户端设置地图条目。
add cmp policy <name> -rule <expression> -resAction <string>
add cmp policy set_user_privilege_pol -rule $user_privilege_map.valueExists(client.ip.src).not -resAction set_user_privilege>
<!--NeedCopy-->
如果客户端的缓存权限条目为“GOLD”，则创建压缩策略。
add cmp policy <name> -rule <expression> -resAction <string>
add cmp policy compress_if_gold_privilege_pol -rule '$user_privilege_map[client.ip.src].eq("GOLD")' -resAction compress
<!--NeedCopy-->
全局绑定压缩策略。
bind cmp global <policyName> [-priority <positive_integer>] [-state (ENABLED | DISABLED )] [-gotoPriorityExpression <expression>] [-type <type>] [-invoke (<labelType> <labelName>) ]
bind cmp global set_user_privilege_pol -priority 10 NEXT
bind cmp global compress_if_gold_privilege_pol -priority 20 END
<!--NeedCopy-->
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