122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
// Copyright 2021 PingCAP, Inc.
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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 executor
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import (
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"strings"
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"github.com/pingcap/tidb/pkg/extension"
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"github.com/pingcap/tidb/pkg/parser/ast"
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)
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var (
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// AnalyzeProgressTest is for test.
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AnalyzeProgressTest struct{}
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)
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// SetFromString constructs a slice of strings from a comma separated string.
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// It is assumed that there is no duplicated entry. You could use addToSet to maintain this property.
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// It is exported for tests. I HOPE YOU KNOW WHAT YOU ARE DOING.
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func SetFromString(value string) []string {
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if len(value) == 0 {
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return nil
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}
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return strings.Split(value, ",")
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}
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func setToString(set []string) string {
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return strings.Join(set, ",")
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}
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// addToSet add a value to the set, e.g:
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// addToSet("Select,Insert,Update", "Update") returns "Select,Insert,Update".
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func addToSet(set []string, value string) []string {
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for _, v := range set {
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if v == value {
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return set
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}
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}
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return append(set, value)
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}
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// deleteFromSet delete the value from the set, e.g:
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// deleteFromSet("Select,Insert,Update", "Update") returns "Select,Insert".
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func deleteFromSet(set []string, value string) []string {
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for i, v := range set {
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if v == value {
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copy(set[i:], set[i+1:])
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return set[:len(set)-1]
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}
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}
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return set
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}
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// batchRetrieverHelper is a helper for batch returning data with known total rows. This helps implementing memtable
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// retrievers of some information_schema tables. Initialize `batchSize` and `totalRows` fields to use it.
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type batchRetrieverHelper struct {
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// When retrieved is true, it means retrieving is finished.
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retrieved bool
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// The index that the retrieving process has been done up to (exclusive).
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retrievedIdx int
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batchSize int
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totalRows int
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}
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// nextBatch calculates the index range of the next batch. If there is such a non-empty range, the `retrieveRange` func
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// will be invoked and the range [start, end) is passed to it. Returns error if `retrieveRange` returns error.
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func (b *batchRetrieverHelper) nextBatch(retrieveRange func(start, end int) error) error {
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if b.retrievedIdx >= b.totalRows {
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b.retrieved = true
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}
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if b.retrieved {
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return nil
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}
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start := b.retrievedIdx
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end := b.retrievedIdx + b.batchSize
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if end > b.totalRows {
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end = b.totalRows
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}
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err := retrieveRange(start, end)
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if err != nil {
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b.retrieved = true
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return err
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}
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b.retrievedIdx = end
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if b.retrievedIdx == b.totalRows {
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b.retrieved = true
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}
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return nil
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}
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// encodePassword encodes the password for the user. It invokes the auth plugin if it is available.
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func encodePassword(u *ast.UserSpec, authPlugin *extension.AuthPlugin) (string, bool) {
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if u.AuthOpt == nil {
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return "", true
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}
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// If the extension auth plugin is available, use it to encode the password.
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if authPlugin != nil {
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if u.AuthOpt.ByAuthString {
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return authPlugin.GenerateAuthString(u.AuthOpt.AuthString)
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}
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// If we receive a hash string, validate it first.
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if authPlugin.ValidateAuthString(u.AuthOpt.HashString) {
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return u.AuthOpt.HashString, true
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}
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return "", false
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}
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return u.EncodedPassword()
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}
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