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// This file is part of MinIO Console Server
// Copyright (c) 2021 MinIO, Inc.
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
package restapi
import (
"context"
"encoding/json"
"fmt"
"net/http"
"regexp"
"strings"
"github.com/gorilla/websocket"
mc "github.com/minio/mc/cmd"
)
type watchOptions struct {
BucketName string
mc.WatchOptions
}
func startWatch(ctx context.Context, conn WSConn, wsc MCClient, options *watchOptions) error {
wo, pErr := wsc.watch(ctx, options.WatchOptions)
if pErr != nil {
LogError("error initializing watch: %v", pErr.Cause)
return pErr.Cause
}
for {
select {
case <-ctx.Done():
close(wo.DoneChan)
return nil
case events, ok := <-wo.Events():
// zero value returned because the channel is closed and empty
if !ok {
return nil
}
for _, event := range events {
// Serialize message to be sent
bytes, err := json.Marshal(event)
if err != nil {
LogError("error on json.Marshal: %v", err)
return err
}
// Send Message through websocket connection
err = conn.writeMessage(websocket.TextMessage, bytes)
if err != nil {
LogError("error writeMessage: %v", err)
return err
}
}
case pErr, ok := <-wo.Errors():
// zero value returned because the channel is closed and empty
if !ok {
return nil
}
if pErr != nil {
LogError("error on watch: %v", pErr.Cause)
return pErr.Cause
}
}
}
}
// getWatchOptionsFromReq gets bucket name, events, prefix, suffix from a websocket
// watch path if defined.
// path come as : `/watch/bucket1` and query
// params come on request form
func getWatchOptionsFromReq(req *http.Request) (*watchOptions, error) {
wOptions := watchOptions{}
// Default Events if not defined
wOptions.Events = []string{"put", "get", "delete"}
re := regexp.MustCompile(`(/watch/)(.*?$)`)
matches := re.FindAllSubmatch([]byte(req.URL.Path), -1)
// matches comes as e.g.
// [["...", "/watch/", "bucket1"]]
// [["/watch/" "/watch/" ""]]
if len(matches) == 0 || len(matches[0]) < 3 {
return nil, fmt.Errorf("invalid url: %s", req.URL.Path)
}
wOptions.BucketName = strings.TrimSpace(string(matches[0][2]))
events := req.FormValue("events")
if strings.TrimSpace(events) != "" {
wOptions.Events = strings.Split(events, ",")
}
wOptions.Prefix = req.FormValue("prefix")
wOptions.Suffix = req.FormValue("suffix")
return &wOptions, nil
}
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