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resolver.go
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resolver.go
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/*
* Copyright (c) 2019-2022. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package grpc
import (
"errors"
"fmt"
"regexp"
"sort"
"google.golang.org/grpc/attributes"
"google.golang.org/grpc/resolver"
"google.golang.org/grpc/serviceconfig"
"github.com/pydio/cells/v4/common/client"
"github.com/pydio/cells/v4/common/registry"
"github.com/pydio/cells/v4/common/utils/uuid"
)
var (
errMissingAddr = errors.New("cells resolver: missing address")
errAddrMisMatch = errors.New("cells resolver: invalid uri")
regex, _ = regexp.Compile("^([A-z0-9.]*?)(:[0-9]{1,5})?\\/([A-z_]*)$")
)
type cellsBuilder struct {
reg registry.Registry
balancerName string
}
type cellsResolver struct {
address string
cc resolver.ClientConn
name string
serviceConfig *serviceconfig.ParseResult
disableServiceConfig bool
}
func NewBuilder(reg registry.Registry, oo ...client.BalancerOption) resolver.Builder {
// build unique picker for options
balancerId := BalancerRoundRobin + uuid.New()
registerBalancer(balancerId, oo...)
return &cellsBuilder{
reg: reg,
balancerName: balancerId,
}
}
func (b *cellsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
// host, port, name, err := parseTarget(fmt.Sprintf("%s/%s", target.Authority, target.Endpoint))
_, _, name, err := parseTarget(fmt.Sprintf("%s/%s", target.Authority, target.Endpoint))
if err != nil {
return nil, err
}
parseRes := cc.ParseServiceConfig(`{"loadBalancingPolicy": "` + b.balancerName + `"}`)
if parseRes.Err != nil {
return nil, parseRes.Err
}
cr := &cellsResolver{
name: name,
cc: cc,
serviceConfig: parseRes,
disableServiceConfig: opts.DisableServiceConfig,
}
rc, err := client.NewResolverCallback(b.reg)
if err != nil {
return nil, err
}
rc.Add(func(m map[string]*client.ServerAttributes) error {
var addresses []resolver.Address
for _, mm := range m {
if mm.Name != "grpc" {
continue
}
for _, addr := range mm.Addresses {
addresses = append(addresses, resolver.Address{
Addr: addr,
Attributes: attributes.New("services", comparableSlice(mm.Services)),
BalancerAttributes: mm.BalancerAttributes,
})
}
}
if len(addresses) == 0 {
return nil
}
if err := cr.cc.UpdateState(resolver.State{
Addresses: addresses,
ServiceConfig: cr.serviceConfig,
}); err != nil {
return err
}
return nil
})
return cr, nil
}
func (b *cellsBuilder) Scheme() string {
return "cells"
}
func (cr *cellsResolver) ResolveNow(opt resolver.ResolveNowOptions) {
}
func (cr *cellsResolver) Close() {
}
func parseTarget(target string) (host, port, name string, err error) {
if target == "" {
return "", "", "", errMissingAddr
}
if !regex.MatchString(target) {
return "", "", "", errAddrMisMatch
}
groups := regex.FindStringSubmatch(target)
host = groups[1]
port = groups[2]
name = groups[3]
return host, port, name, nil
}
type comparableSlice []string
func (c comparableSlice) Equal(o interface{}) bool {
if &c == o {
return true
}
ss, ok := o.(comparableSlice)
if !ok {
return false
}
if len(ss) != len(c) {
return false
}
sort.Strings(c)
sort.Strings(ss)
for i, v := range c {
if ss[i] != v {
return false
}
}
return true
}