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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2020/03/04 07:42:10 UTC
[GitHub] [servicecomb-java-chassis] zhangbeiyuan-hw opened a new issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
zhangbeiyuan-hw opened a new issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
URL: https://github.com/apache/servicecomb-java-chassis/issues/1620
后台我有好几个服务，不想每个都配置map映射，想通过default配置实现自动转发，如下配置：
如果我有两个微服务，microserviceName是serverA，提供的url是 /v1/users
另一个微服务microserviceName是serverB，提供url是 server-b/v1/hosts
请教一下，defalut如何配置带服务名自动转发？ js中如何正确构造 url
```yaml
servicecomb:
http:
dispatcher:
edge:
default:
enabled: true
prefix: rest
withVersion: true
prefixSegmentCount: 1
```
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[GitHub] [servicecomb-java-chassis] yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
Posted by GitBox <gi...@apache.org>.
yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
URL: https://github.com/apache/servicecomb-java-chassis/issues/1620#issuecomment-594985791
[这里](https://github.com/servicestage-demo/microservice-dev-training21days/tree/day6_homework)有一个demo可以作为参考。`DefaultEdgeDispatcher`需要匹配一个url前缀来触发其工作，并且在转发请求的时候需要从url中截取出一部分作为请求的名字。
这个demo的EdgeService服务配置跟你给的一样：
```yaml
servicecomb:
http:
dispatcher:
edge:
default: # 使用DefaultEdgeDispatcher开发网关服务
enabled: true # 开启DefaultEdgeDispatcher
prefix: rest # 匹配请求路径前缀为/rest
# withVersion默认值就是true，这里只是展示一下，实际上可以省略该配置
withVersion: true # 请求带版本号，例如v1表示[1.0.0,2.0.0)范围内的微服务版本
# prefixSegmentCount默认值就是1，这里只是展示一下，实际上可以省略该配置
prefixSegmentCount: 1 # 前缀长度，例如/rest/provider/v0/hello/Bob，去掉第一段，将/provider/v0/hello/Bob转发到后端
```
名叫`provider`的后端服务中的接口在[这里](https://github.com/servicestage-demo/microservice-dev-training21days/blob/day6_homework/helloworld-provider/src/main/java/microservice/demo/training21days/provider/service/HelloService.java)
以这种配置项为例，`prefix`是`rest`表示发给EdgeService网关的请求url需要以`rest`开头才能被`DefaultEdgeDispatcher`转发。`withVersion=true`表示url中会带版本范围。`prefixSegmentCount=1`表示`DefaultEdgeDispatcher`处理的请求会被截掉url的第一段后再转给后端服务。
向EdgeService发请求 `/rest/provider/v0/hello/Bob` 时：
- 第一段`rest`是匹配dispatcher的前缀；
- 第二段`provider`会作为后端服务的名字，名字不对就会找不到后端服务；
- 第三段是版本范围，`v0`表示[0.0.0, 1,0.0)的大版本范围
因为`prefixSegmentCount=1`，所以第一段`/rest`会被截掉，实际发给后端的·provider`服务的是 `/provider/v0/hello/Bob`
----------------------
按照上述规则，你的serverA，提供的url是 `/v1/users`，serverB提供的请求url是 `server-b/v1/hosts`，这种url格式不符合`DefaultEdgeDispatcher`对于后端服务url `/<服务名>/<版本范围>/其他部分的url` 这样的格式要求。所以在调用的时候需要把`/<服务名>/<版本范围>`这一段额外加上去，然后把`DefaultEdgeDispatcher`的`prefixSegmentCount`设置为`3`以截掉请求url开头的`/rest/<服务名>/<版本范围>`。
例如，`/rest/serverA/v1/v1/users`在转发时会把`/v1/users`发送给版本范围在1.0.0到2.0.0（不包含）之间的serverA服务。`/rest/serverB/v1/server-b/v1/hosts`在截取完成后就是把`/server-b/v1/hosts`发送给名为serverB服务的1.0.0到2.0.0版本。
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[GitHub] [servicecomb-java-chassis] yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
Posted by GitBox <gi...@apache.org>.
yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
URL: https://github.com/apache/servicecomb-java-chassis/issues/1620#issuecomment-594998533
不客气 : )
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[GitHub] [servicecomb-java-chassis] yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
Posted by GitBox <gi...@apache.org>.
yhs0092 commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
URL: https://github.com/apache/servicecomb-java-chassis/issues/1620#issuecomment-594986867
嫌这样外部url里有两个`v1`太丑了的话，也可以考虑设置`withVersion=false`。这样`DefaultEdgeDispatcher`不会再帮你限定转发到后端服务的版本范围了，如果有必要的话需要你自己通过额外方式来进行限定。
总而言之`DefaultEdgeDispatcher`比较适用于后端服务的url经过统一规划，符合预设格式的场景。如果碰到url不规则的场景还要用`DefaultEdgeDispatcher`的话，只能自己额外加一段服务名（和版本范围），再在转发的时候截取掉了。
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[GitHub] [servicecomb-java-chassis] zhangbeiyuan-hw commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
Posted by GitBox <gi...@apache.org>.
zhangbeiyuan-hw commented on issue #1620: edge配置是如何设置默认配置的？可以根据服务名自动转发服务
URL: https://github.com/apache/servicecomb-java-chassis/issues/1620#issuecomment-594987243
我试试，非常感谢
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