undying opened a new pull request, #12187:
URL: https://github.com/apache/apisix/pull/12187
### Description
Added support for Nginx variables in the `service_name` parameter for
service discovery. This allows dynamic service name resolution based on Nginx
variables such as `$host`, `$http_host`, and others, working with all service
discovery implementations (Consul, Eureka, Nacos, etc.).
### Detailed Description
#### Problem
The current implementation of service discovery in APISIX does not support
using Nginx variables in the `service_name` parameter. This limits
configuration flexibility as the service name must be hardcoded in the
configuration, regardless of which service discovery implementation is used.
#### Solution
Added support for Nginx variables in the `service_name` parameter at the
upstream level. This change enables dynamic service name resolution across all
service discovery implementations. For example:
#### Usage Example
1. Define a variable in Nginx configuration:
```nginx
map $http_host $backend {
default echo;
"~([^.]+).domain.local" $1;
}
```
2. Define routes
```yaml
routes:
-
uri: "/*"
host: "*.domain.local"
upstream:
service_name: $backend # Nginx variable
type: "roundrobin"
discovery_type: "consul" # or any other discovery type
```
2. Use the variable in route configuration with any service discovery:
```yaml
routes:
-
uri: "/*"
host: "*.domain.local"
upstream:
service_name: $backend
type: "roundrobin"
discovery_type: "consul" # or "eureka", "nacos", etc.
```
In this example, if a request comes to `service1.domain.local`, the
`$backend` variable will be set to `service1`, and APISIX will look for a
service with this name in the configured service discovery system.
#### Backward Compatibility
The change is fully backward compatible because:
1. Existing configurations will continue to work without changes
2. The new functionality is only activated when using Nginx variables in
`service_name`
3. The change is implemented at the upstream level, making it available to
all service discovery implementations
---
### Checklist
- [ ] I have explained the need for this PR and the problem it solves
- [ ] I have explained the changes or the new features added to this PR
- [ ] I have added tests corresponding to this change
- [ ] I have updated the documentation to reflect this change
- [ ] I have verified that this change is backward compatible (If not,
please discuss on the [APISIX mailing
list](https://github.com/apache/apisix/tree/master#community) first)
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