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meta-providers.go
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/
meta-providers.go
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/*
* Copyright (c) 2019. 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 meta provides tool for reading metadata from services declaring "MetaProvider" support
package meta
import (
"context"
"io"
"time"
"github.com/pydio/cells/common/utils/permissions"
"go.uber.org/zap"
"github.com/pydio/cells/common"
"github.com/pydio/cells/common/log"
defaults "github.com/pydio/cells/common/micro"
"github.com/pydio/cells/common/proto/tree"
"github.com/pydio/cells/common/registry"
)
const (
ServiceMetaProvider = "MetaProvider"
ServiceMetaNsProvider = "MetaNsProvider"
)
type Loader interface {
io.Closer
LoadMetas(ctx context.Context, nodes ...*tree.Node)
}
type StreamLoader struct {
names []string
streamers []tree.NodeProviderStreamer_ReadNodeStreamClient
closer MetaProviderCloser
}
func NewStreamLoader(ctx context.Context) Loader {
l := &StreamLoader{}
l.streamers, l.closer, l.names = initMetaProviderClients(ctx)
return l
}
func (l *StreamLoader) LoadMetas(ctx context.Context, nodes ...*tree.Node) {
enrichNodesMetaFromProviders(ctx, l.streamers, l.names, nodes...)
}
func (l *StreamLoader) Close() error {
return l.closer()
}
type MetaProviderCloser func() error
func initMetaProviderClients(ctx context.Context) ([]tree.NodeProviderStreamer_ReadNodeStreamClient, MetaProviderCloser, []string) {
metaProviders, names := getMetaProviderStreamers(ctx)
var streamers []tree.NodeProviderStreamer_ReadNodeStreamClient
for _, cli := range metaProviders {
metaStreamer, metaE := cli.ReadNodeStream(ctx)
if metaE != nil {
continue
}
streamers = append(streamers, metaStreamer)
}
outCloser := func() error {
for _, streamer := range streamers {
streamer.Close()
}
return nil
}
return streamers, outCloser, names
}
func enrichNodesMetaFromProviders(ctx context.Context, streamers []tree.NodeProviderStreamer_ReadNodeStreamClient, names []string, nodes ...*tree.Node) {
profiles := make(map[string][]time.Duration)
for _, node := range nodes {
for i, metaStreamer := range streamers {
name := names[i]
// This metaStream is already loaded, avoid reloading
if node.HasMetaKey("pydio:meta-loaded-" + name) {
log.Logger(ctx).Debug("Meta " + name + " already loaded, skipping")
continue
}
start := time.Now()
sendError := metaStreamer.Send(&tree.ReadNodeRequest{Node: node})
if sendError != nil {
if sendError != io.EOF && sendError != io.ErrUnexpectedEOF {
log.Logger(ctx).Error("Error while sending to metaStreamer", zap.String("n", name), node.ZapPath(), node.ZapUuid(), zap.Error(sendError))
}
continue
}
metaResponse, err := metaStreamer.Recv()
if err == nil {
if node.MetaStore == nil {
node.MetaStore = make(map[string]string, len(metaResponse.Node.MetaStore)+1)
}
for k, v := range metaResponse.Node.MetaStore {
node.MetaStore[k] = v
}
node.MetaStore["pydio:meta-loaded-"+name] = "true" // JSON
}
profiles[name] = append(profiles[name], time.Now().Sub(start))
}
}
for n, p := range profiles {
l := len(p)
var total time.Duration
for _, d := range p {
total += d
}
avgNano := float64(total.Nanoseconds()) / float64(l)
avg := time.Duration(avgNano)
log.Logger(ctx).Debug("EnrichMetaProvider - Average time spent", zap.Duration(n, avg))
}
}
func getMetaProviderStreamers(ctx context.Context) ([]tree.NodeProviderStreamerClient, []string) {
var result []tree.NodeProviderStreamerClient
var names []string
// Load core Meta
result = append(result, tree.NewNodeProviderStreamerClient(registry.GetClient(common.ServiceMeta)))
names = append(names, common.ServiceGrpcNamespace_+common.ServiceMeta)
// Load User meta (if claims are not empty!)
if u, _ := permissions.FindUserNameInContext(ctx); u == "" {
log.Logger(ctx).Debug("No user/claims found - skipping user metas on metaStreamers init!")
return result, names
}
// Other Meta Providers (running services only)
services, err := registry.ListServicesWithMicroMeta(ServiceMetaProvider, "stream")
if err != nil {
return nil, names
}
for _, srv := range services {
result = append(result, tree.NewNodeProviderStreamerClient(srv.Name(), defaults.NewClient()))
names = append(names, srv.Name())
}
return result, names
}