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builder.go
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builder.go
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package direct
import (
"fmt"
"github.com/sjclijie/go-zero/core/utils"
"google.golang.org/grpc/resolver"
"strings"
)
type builder struct {
scheme string
endpointSepChar int32
subsetSize int
Endpoints []string
}
func NewBuilder(scheme string) *builder {
return &builder{
endpointSepChar: ',',
subsetSize: 32,
scheme: scheme,
}
}
func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (
resolver.Resolver, error) {
var addrs []resolver.Address
endpoints := strings.FieldsFunc(target.Endpoint, func(r rune) bool {
return r == b.endpointSepChar
})
for _, val := range utils.Subset(endpoints, b.subsetSize) {
addrs = append(addrs, resolver.Address{
Addr: val,
})
}
cc.UpdateState(resolver.State{
Addresses: addrs,
})
return &Resolver{
cc: cc,
}, nil
}
func (b *builder) Scheme() string {
return b.scheme
}
func (b *builder) Target(endpoints []string) string {
return fmt.Sprintf("%s:///%s", b.scheme,
strings.Join(endpoints, fmt.Sprintf("%c", b.endpointSepChar)))
}