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context.go
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context.go
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/*
* Copyright (c) 2018. 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 servicecontext performs context values read/write, generally through server or client wrappers
package servicecontext
import (
"context"
"sync/atomic"
"github.com/pkg/errors"
"github.com/pydio/cells/common/dao"
"github.com/pydio/cells/x/configx"
)
type contextType int
const (
ServiceColorRest = 32
ServiceColorGrpc = 35
ServiceColorOther = 36
serviceColorKey contextType = iota
serviceNameKey
operationIDKey
operationLabelKey
daoKey
configKey
ContextMetaJobUuid = "X-Pydio-Job-Uuid"
ContextMetaTaskUuid = "X-Pydio-Task-Uuid"
ContextMetaTaskActionPath = "X-Pydio-Task-ActionPath"
)
var serviceColorCount uint64 = 30
// WithServiceColor returns a context which knows its service assigned color
func WithServiceColor(ctx context.Context, color ...uint64) context.Context {
if len(color) > 0 {
return context.WithValue(ctx, serviceColorKey, color[0])
}
atomic.AddUint64(&serviceColorCount, 1)
return context.WithValue(ctx, serviceColorKey, atomic.LoadUint64(&serviceColorCount))
}
// WithServiceName returns a context which knows its service name
func WithServiceName(ctx context.Context, serviceName string) context.Context {
return context.WithValue(ctx, serviceNameKey, serviceName)
}
// WithSessionID returns a context which knows its session ID
func WithOperationID(ctx context.Context, operationID string, operationLabel ...string) context.Context {
c := context.WithValue(ctx, operationIDKey, operationID)
if len(operationLabel) > 0 {
c = context.WithValue(c, operationLabelKey, operationLabel[0])
}
return c
}
// WithDAO links a dao to the context
func WithDAO(ctx context.Context, dao dao.DAO) context.Context {
return context.WithValue(ctx, daoKey, dao)
}
// WithConfig links a config to the context
func WithConfig(ctx context.Context, config configx.Values) context.Context {
return context.WithValue(ctx, configKey, config)
}
// GetServiceColor returns the service name associated to this context
func GetServiceColor(ctx context.Context) uint64 {
if color, ok := ctx.Value(serviceColorKey).(uint64); ok {
return color
}
return 0
}
// GetServiceName returns the service name associated to this context
func GetServiceName(ctx context.Context) string {
if name, ok := ctx.Value(serviceNameKey).(string); ok {
return name
}
return ""
}
// GetRequestID returns the session id associated to this context
func GetOperationID(ctx context.Context) (string, string) {
if id, ok := ctx.Value(operationIDKey).(string); ok {
var label string
if l, o := ctx.Value(operationLabelKey).(string); o {
label = l
}
return id, label
}
return "", ""
}
// GetDAO returns the dao from the context in argument
func GetDAO(ctx context.Context) dao.DAO {
if db, ok := ctx.Value(daoKey).(dao.DAO); ok {
return db
}
return nil
}
// GetConfig returns the config from the context in argument
func GetConfig(ctx context.Context) configx.Values {
if conf, ok := ctx.Value(configKey).(configx.Values); ok {
return conf
}
return nil
}
// GetConfig already unmarshalled in a specific format
func ScanConfig(ctx context.Context, target interface{}) error {
conf := GetConfig(ctx)
if conf == nil {
return errors.New("cannot find config in this context")
}
return conf.Scan(target)
}