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apiextensions.go
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apiextensions.go
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package system
import (
"context"
"fmt"
"time"
managementv1 "github.com/rancher/opni/pkg/apis/management/v1"
"google.golang.org/grpc"
"google.golang.org/protobuf/types/known/emptypb"
)
// ExtensionClientInterface allows plugins to obtain clients to API extensions
// implemented by other plugins.
type ExtensionClientInterface interface {
// Attempt to obtain a ClientConn such that the API extensions with the given
// names will be available on that client. If the requested extension is not
// available, it will retry until it becomes available, or until the context
// is canceled.
GetClientConn(ctx context.Context, serviceNames ...string) (grpc.ClientConnInterface, error)
}
type apiExtensionInterfaceImpl struct {
managementClientConn *grpc.ClientConn
}
func (c *apiExtensionInterfaceImpl) GetClientConn(ctx context.Context, serviceNames ...string) (grpc.ClientConnInterface, error) {
//FIXME:(alex) Not being called
found := false
serviceMap := make(map[string]bool)
discovered := make(map[string]bool)
for k := range serviceNames {
serviceMap[serviceNames[k]] = true
discovered[serviceNames[k]] = false
}
// Use c.managementClientConn to obtain a management client, then query the api extension list for that name.
// Only when the extension becomes available, return c.managementClientConn.
client := managementv1.NewManagementClient(c.managementClientConn)
for retries := 10; retries > 0; retries-- {
apiExtensions, err := client.APIExtensions(ctx, &emptypb.Empty{})
if err != nil {
time.Sleep(time.Second)
continue
}
for _, ext := range apiExtensions.Items {
if serviceMap[ext.ServiceDesc.GetName()] {
discovered[ext.ServiceDesc.GetName()] = true
}
}
for _, has := range discovered {
found = found && has
}
if found {
break
} else {
time.Sleep(time.Second)
}
}
if found {
return nil, fmt.Errorf("Failed to get one or more API extensions")
}
return c.managementClientConn, nil
}