64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright 2015 clair authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package database
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import (
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cerrors "github.com/coreos/clair/utils/errors"
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"github.com/google/cayley"
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)
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const (
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fieldFlagValue = "value"
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flagNodePrefix = "flag"
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)
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// UpdateFlag creates a flag or update an existing flag's value
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func UpdateFlag(name, value string) error {
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if name == "" || value == "" {
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log.Warning("could not insert a flag which has an empty name or value")
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return cerrors.NewBadRequestError("could not insert a flag which has an empty name or value")
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}
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// Initialize transaction
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t := cayley.NewTransaction()
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// Get current flag value
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currentValue, err := GetFlagValue(name)
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if err != nil {
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return err
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}
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// Build transaction
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name = flagNodePrefix + ":" + name
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if currentValue != "" {
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t.RemoveQuad(cayley.Triple(name, fieldFlagValue, currentValue))
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}
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t.AddQuad(cayley.Triple(name, fieldFlagValue, value))
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// Apply transaction
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if err = store.ApplyTransaction(t); err != nil {
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log.Errorf("failed transaction (UpdateFlag): %s", err)
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return ErrTransaction
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}
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// Return
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return nil
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}
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// GetFlagValue returns the value of the flag given by its name (or an empty string if the flag does not exist)
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func GetFlagValue(name string) (string, error) {
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return toValue(cayley.StartPath(store, flagNodePrefix+":"+name).Out(fieldFlagValue))
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}
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