feat(utils): 添加cronex高性能cron库支持，包含Apache 2.0许可证和完整测试用例
This commit is contained in:
655
common/utils/cronex/parser.go
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655
common/utils/cronex/parser.go
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@@ -0,0 +1,655 @@
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//Copyright (C) 2012 Rob Figueiredo
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//2022 guonaihong,
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// 1.修改内容，裁剪代码只保留一个干净的解析器
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// 2.默认让parse支持到秒级别
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//All Rights Reserved.
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package cronex
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"time"
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)
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// Configuration options for creating a parser. Most options specify which
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// fields should be included, while others enable features. If a field is not
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// included the parser will assume a default value. These options do not change
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// the order fields are parse in.
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type ParseOption int
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const (
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Second ParseOption = 1 << iota // Seconds field, default 0
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SecondOptional // Optional seconds field, default 0
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Minute // Minutes field, default 0
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Hour // Hours field, default 0
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Dom // Day of month field, default *
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Month // Month field, default *
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Dow // Day of week field, default *
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DowOptional // Optional day of week field, default *
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Descriptor // Allow descriptors such as @monthly, @weekly, etc.
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)
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var places = []ParseOption{
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Second,
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Minute,
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Hour,
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Dom,
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Month,
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Dow,
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}
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var defaults = []string{
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"0",
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"0",
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"0",
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"*",
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"*",
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"*",
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}
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// A custom Parser that can be configured.
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type Parser struct {
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options ParseOption
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}
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// NewParser creates a Parser with custom options.
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//
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// It panics if more than one Optional is given, since it would be impossible to
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// correctly infer which optional is provided or missing in general.
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//
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// Examples
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//
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// // Standard parser without descriptors
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// specParser := NewParser(Minute | Hour | Dom | Month | Dow)
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// sched, err := specParser.Parse("0 0 15 */3 *")
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//
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// // Same as above, just excludes time fields
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// specParser := NewParser(Dom | Month | Dow)
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// sched, err := specParser.Parse("15 */3 *")
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//
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// // Same as above, just makes Dow optional
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// specParser := NewParser(Dom | Month | DowOptional)
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// sched, err := specParser.Parse("15 */3")
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//
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func NewParser(options ParseOption) Parser {
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optionals := 0
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if options&DowOptional > 0 {
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optionals++
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}
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if options&SecondOptional > 0 {
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optionals++
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}
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if optionals > 1 {
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panic("multiple optionals may not be configured")
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}
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return Parser{options}
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}
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// Parse returns a new crontab schedule representing the given spec.
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// It returns a descriptive error if the spec is not valid.
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// It accepts crontab specs and features configured by NewParser.
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func (p Parser) Parse(spec string) (Schedule, error) {
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if len(spec) == 0 {
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return nil, fmt.Errorf("empty spec string")
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}
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// Extract timezone if present
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var loc = time.Local
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if strings.HasPrefix(spec, "TZ=") || strings.HasPrefix(spec, "CRON_TZ=") {
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var err error
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i := strings.Index(spec, " ")
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eq := strings.Index(spec, "=")
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if loc, err = time.LoadLocation(spec[eq+1 : i]); err != nil {
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return nil, fmt.Errorf("provided bad location %s: %v", spec[eq+1:i], err)
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}
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spec = strings.TrimSpace(spec[i:])
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}
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// Handle named schedules (descriptors), if configured
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if strings.HasPrefix(spec, "@") {
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if p.options&Descriptor == 0 {
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return nil, fmt.Errorf("parser does not accept descriptors: %v", spec)
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}
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return parseDescriptor(spec, loc)
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}
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// Split on whitespace.
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fields := strings.Fields(spec)
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// Validate & fill in any omitted or optional fields
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var err error
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fields, err = normalizeFields(fields, p.options)
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if err != nil {
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return nil, err
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}
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field := func(field string, r bounds) uint64 {
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if err != nil {
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return 0
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}
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var bits uint64
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bits, err = getField(field, r)
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return bits
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}
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var (
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second = field(fields[0], seconds)
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minute = field(fields[1], minutes)
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hour = field(fields[2], hours)
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dayofmonth = field(fields[3], dom)
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month = field(fields[4], months)
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dayofweek = field(fields[5], dow)
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)
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if err != nil {
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return nil, err
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}
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return &SpecSchedule{
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Second: second,
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Minute: minute,
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Hour: hour,
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Dom: dayofmonth,
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Month: month,
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Dow: dayofweek,
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Location: loc,
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}, nil
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}
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// normalizeFields takes a subset set of the time fields and returns the full set
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// with defaults (zeroes) populated for unset fields.
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//
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// As part of performing this function, it also validates that the provided
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// fields are compatible with the configured options.
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func normalizeFields(fields []string, options ParseOption) ([]string, error) {
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// Validate optionals & add their field to options
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optionals := 0
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if options&SecondOptional > 0 {
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options |= Second
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optionals++
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}
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if options&DowOptional > 0 {
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options |= Dow
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optionals++
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}
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if optionals > 1 {
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return nil, fmt.Errorf("multiple optionals may not be configured")
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}
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// Figure out how many fields we need
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max := 0
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for _, place := range places {
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if options&place > 0 {
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max++
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}
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}
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min := max - optionals
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// Validate number of fields
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if count := len(fields); count < min || count > max {
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if min == max {
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return nil, fmt.Errorf("expected exactly %d fields, found %d: %s", min, count, fields)
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}
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return nil, fmt.Errorf("expected %d to %d fields, found %d: %s", min, max, count, fields)
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}
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// Populate the optional field if not provided
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if min < max && len(fields) == min {
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switch {
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case options&DowOptional > 0:
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fields = append(fields, defaults[5]) // TODO: improve access to default
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case options&SecondOptional > 0:
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fields = append([]string{defaults[0]}, fields...)
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default:
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return nil, fmt.Errorf("unknown optional field")
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}
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}
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// Populate all fields not part of options with their defaults
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n := 0
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expandedFields := make([]string, len(places))
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copy(expandedFields, defaults)
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for i, place := range places {
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if options&place > 0 {
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expandedFields[i] = fields[n]
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n++
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}
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}
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return expandedFields, nil
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}
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var standardParser = NewParser(
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SecondOptional | Minute | Hour | Dom | Month | Dow | Descriptor,
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)
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// ParseStandard returns a new crontab schedule representing the given
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// standardSpec (https://en.wikipedia.org/wiki/Cron). It requires 5 entries
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// representing: minute, hour, day of month, month and day of week, in that
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// order. It returns a descriptive error if the spec is not valid.
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//
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// It accepts
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// - Standard crontab specs, e.g. "* * * * ?"
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// - Descriptors, e.g. "@midnight", "@every 1h30m"
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func ParseStandard(standardSpec string) (Schedule, error) {
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return standardParser.Parse(standardSpec)
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}
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// getField returns an Int with the bits set representing all of the times that
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// the field represents or error parsing field value. A "field" is a comma-separated
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// list of "ranges".
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func getField(field string, r bounds) (uint64, error) {
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var bits uint64
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ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })
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for _, expr := range ranges {
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bit, err := getRange(expr, r)
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if err != nil {
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return bits, err
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}
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bits |= bit
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}
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return bits, nil
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}
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// getRange returns the bits indicated by the given expression:
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// number | number "-" number [ "/" number ]
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// or error parsing range.
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func getRange(expr string, r bounds) (uint64, error) {
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var (
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start, end, step uint
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rangeAndStep = strings.Split(expr, "/")
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lowAndHigh = strings.Split(rangeAndStep[0], "-")
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singleDigit = len(lowAndHigh) == 1
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err error
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)
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var extra uint64
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if lowAndHigh[0] == "*" || lowAndHigh[0] == "?" {
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start = r.min
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end = r.max
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extra = starBit
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} else {
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start, err = parseIntOrName(lowAndHigh[0], r.names)
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if err != nil {
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return 0, err
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}
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switch len(lowAndHigh) {
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case 1:
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end = start
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case 2:
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end, err = parseIntOrName(lowAndHigh[1], r.names)
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if err != nil {
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return 0, err
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}
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default:
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return 0, fmt.Errorf("too many hyphens: %s", expr)
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}
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}
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switch len(rangeAndStep) {
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case 1:
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step = 1
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case 2:
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step, err = mustParseInt(rangeAndStep[1])
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if err != nil {
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return 0, err
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}
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// Special handling: "N/step" means "N-max/step".
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if singleDigit {
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end = r.max
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}
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if step > 1 {
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extra = 0
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}
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default:
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return 0, fmt.Errorf("too many slashes: %s", expr)
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}
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if start < r.min {
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return 0, fmt.Errorf("beginning of range (%d) below minimum (%d): %s", start, r.min, expr)
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}
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if end > r.max {
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return 0, fmt.Errorf("end of range (%d) above maximum (%d): %s", end, r.max, expr)
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}
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if start > end {
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return 0, fmt.Errorf("beginning of range (%d) beyond end of range (%d): %s", start, end, expr)
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}
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if step == 0 {
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return 0, fmt.Errorf("step of range should be a positive number: %s", expr)
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}
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return getBits(start, end, step) | extra, nil
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}
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// parseIntOrName returns the (possibly-named) integer contained in expr.
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func parseIntOrName(expr string, names map[string]uint) (uint, error) {
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if names != nil {
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if namedInt, ok := names[strings.ToLower(expr)]; ok {
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return namedInt, nil
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}
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}
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return mustParseInt(expr)
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}
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// mustParseInt parses the given expression as an int or returns an error.
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func mustParseInt(expr string) (uint, error) {
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num, err := strconv.Atoi(expr)
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if err != nil {
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return 0, fmt.Errorf("failed to parse int from %s: %s", expr, err)
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}
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if num < 0 {
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return 0, fmt.Errorf("negative number (%d) not allowed: %s", num, expr)
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}
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return uint(num), nil
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}
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// getBits sets all bits in the range [min, max], modulo the given step size.
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func getBits(min, max, step uint) uint64 {
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var bits uint64
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// If step is 1, use shifts.
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if step == 1 {
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return ^(math.MaxUint64 << (max + 1)) & (math.MaxUint64 << min)
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}
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// Else, use a simple loop.
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for i := min; i <= max; i += step {
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bits |= 1 << i
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}
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return bits
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}
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// all returns all bits within the given bounds. (plus the star bit)
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func all(r bounds) uint64 {
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return getBits(r.min, r.max, 1) | starBit
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}
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// parseDescriptor returns a predefined schedule for the expression, or error if none matches.
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func parseDescriptor(descriptor string, loc *time.Location) (Schedule, error) {
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switch descriptor {
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case "@yearly", "@annually":
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return &SpecSchedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Dom: 1 << dom.min,
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Month: 1 << months.min,
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Dow: all(dow),
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Location: loc,
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}, nil
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case "@monthly":
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return &SpecSchedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Dom: 1 << dom.min,
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Month: all(months),
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Dow: all(dow),
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Location: loc,
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}, nil
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case "@weekly":
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return &SpecSchedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Dom: all(dom),
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Month: all(months),
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Dow: 1 << dow.min,
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Location: loc,
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}, nil
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case "@daily", "@midnight":
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return &SpecSchedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Dom: all(dom),
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Month: all(months),
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Dow: all(dow),
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Location: loc,
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}, nil
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case "@hourly":
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return &SpecSchedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: all(hours),
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Dom: all(dom),
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Month: all(months),
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Dow: all(dow),
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Location: loc,
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}, nil
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}
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const every = "@every "
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if strings.HasPrefix(descriptor, every) {
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duration, err := time.ParseDuration(descriptor[len(every):])
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if err != nil {
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return nil, fmt.Errorf("failed to parse duration %s: %s", descriptor, err)
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}
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return Every(duration), nil
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}
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return nil, fmt.Errorf("unrecognized descriptor: %s", descriptor)
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}
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// SpecSchedule specifies a duty cycle (to the second granularity), based on a
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// traditional crontab specification. It is computed initially and stored as bit sets.
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type SpecSchedule struct {
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Second, Minute, Hour, Dom, Month, Dow uint64
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// Override location for this schedule.
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Location *time.Location
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}
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// Next returns the next time this schedule is activated, greater than the given
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// time. If no time can be found to satisfy the schedule, return the zero time.
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func (s *SpecSchedule) Next(t time.Time) time.Time {
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// General approach
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//
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// For Month, Day, Hour, Minute, Second:
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// Check if the time value matches. If yes, continue to the next field.
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// If the field doesn't match the schedule, then increment the field until it matches.
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// While incrementing the field, a wrap-around brings it back to the beginning
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// of the field list (since it is necessary to re-verify previous field
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// values)
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// Convert the given time into the schedule's timezone, if one is specified.
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// Save the original timezone so we can convert back after we find a time.
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// Note that schedules without a time zone specified (time.Local) are treated
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// as local to the time provided.
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origLocation := t.Location()
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loc := s.Location
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if loc == time.Local {
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loc = t.Location()
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}
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if s.Location != time.Local {
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t = t.In(s.Location)
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}
|
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|
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// Start at the earliest possible time (the upcoming second).
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t = t.Add(1*time.Second - time.Duration(t.Nanosecond())*time.Nanosecond)
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|
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// This flag indicates whether a field has been incremented.
|
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added := false
|
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|
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// If no time is found within five years, return zero.
|
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yearLimit := t.Year() + 5
|
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|
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WRAP:
|
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if t.Year() > yearLimit {
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return time.Time{}
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}
|
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|
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// Find the first applicable month.
|
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// If it's this month, then do nothing.
|
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for 1<<uint(t.Month())&s.Month == 0 {
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// If we have to add a month, reset the other parts to 0.
|
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if !added {
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added = true
|
||||
// Otherwise, set the date at the beginning (since the current time is irrelevant).
|
||||
t = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, loc)
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}
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t = t.AddDate(0, 1, 0)
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|
||||
// Wrapped around.
|
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if t.Month() == time.January {
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goto WRAP
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}
|
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}
|
||||
|
||||
// Now get a day in that month.
|
||||
//
|
||||
// NOTE: This causes issues for daylight savings regimes where midnight does
|
||||
// not exist. For example: Sao Paulo has DST that transforms midnight on
|
||||
// 11/3 into 1am. Handle that by noticing when the Hour ends up != 0.
|
||||
for !dayMatches(s, t) {
|
||||
if !added {
|
||||
added = true
|
||||
t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, loc)
|
||||
}
|
||||
t = t.AddDate(0, 0, 1)
|
||||
// Notice if the hour is no longer midnight due to DST.
|
||||
// Add an hour if it's 23, subtract an hour if it's 1.
|
||||
if t.Hour() != 0 {
|
||||
if t.Hour() > 12 {
|
||||
t = t.Add(time.Duration(24-t.Hour()) * time.Hour)
|
||||
} else {
|
||||
t = t.Add(time.Duration(-t.Hour()) * time.Hour)
|
||||
}
|
||||
}
|
||||
|
||||
if t.Day() == 1 {
|
||||
goto WRAP
|
||||
}
|
||||
}
|
||||
|
||||
for 1<<uint(t.Hour())&s.Hour == 0 {
|
||||
if !added {
|
||||
added = true
|
||||
t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, loc)
|
||||
}
|
||||
t = t.Add(1 * time.Hour)
|
||||
|
||||
if t.Hour() == 0 {
|
||||
goto WRAP
|
||||
}
|
||||
}
|
||||
|
||||
for 1<<uint(t.Minute())&s.Minute == 0 {
|
||||
if !added {
|
||||
added = true
|
||||
t = t.Truncate(time.Minute)
|
||||
}
|
||||
t = t.Add(1 * time.Minute)
|
||||
|
||||
if t.Minute() == 0 {
|
||||
goto WRAP
|
||||
}
|
||||
}
|
||||
|
||||
for 1<<uint(t.Second())&s.Second == 0 {
|
||||
if !added {
|
||||
added = true
|
||||
t = t.Truncate(time.Second)
|
||||
}
|
||||
t = t.Add(1 * time.Second)
|
||||
|
||||
if t.Second() == 0 {
|
||||
goto WRAP
|
||||
}
|
||||
}
|
||||
|
||||
return t.In(origLocation)
|
||||
}
|
||||
|
||||
// dayMatches returns true if the schedule's day-of-week and day-of-month
|
||||
// restrictions are satisfied by the given time.
|
||||
func dayMatches(s *SpecSchedule, t time.Time) bool {
|
||||
var (
|
||||
domMatch bool = 1<<uint(t.Day())&s.Dom > 0
|
||||
dowMatch bool = 1<<uint(t.Weekday())&s.Dow > 0
|
||||
)
|
||||
if s.Dom&starBit > 0 || s.Dow&starBit > 0 {
|
||||
return domMatch && dowMatch
|
||||
}
|
||||
return domMatch || dowMatch
|
||||
}
|
||||
|
||||
// bounds provides a range of acceptable values (plus a map of name to value).
|
||||
type bounds struct {
|
||||
min, max uint
|
||||
names map[string]uint
|
||||
}
|
||||
|
||||
// The bounds for each field.
|
||||
var (
|
||||
seconds = bounds{0, 59, nil}
|
||||
minutes = bounds{0, 59, nil}
|
||||
hours = bounds{0, 23, nil}
|
||||
dom = bounds{1, 31, nil}
|
||||
months = bounds{1, 12, map[string]uint{
|
||||
"jan": 1,
|
||||
"feb": 2,
|
||||
"mar": 3,
|
||||
"apr": 4,
|
||||
"may": 5,
|
||||
"jun": 6,
|
||||
"jul": 7,
|
||||
"aug": 8,
|
||||
"sep": 9,
|
||||
"oct": 10,
|
||||
"nov": 11,
|
||||
"dec": 12,
|
||||
}}
|
||||
dow = bounds{0, 6, map[string]uint{
|
||||
"sun": 0,
|
||||
"mon": 1,
|
||||
"tue": 2,
|
||||
"wed": 3,
|
||||
"thu": 4,
|
||||
"fri": 5,
|
||||
"sat": 6,
|
||||
}}
|
||||
)
|
||||
|
||||
const (
|
||||
// Set the top bit if a star was included in the expression.
|
||||
starBit = 1 << 63
|
||||
)
|
||||
|
||||
// ConstantDelaySchedule represents a simple recurring duty cycle, e.g. "Every 5 minutes".
|
||||
// It does not support jobs more frequent than once a second.
|
||||
type ConstantDelaySchedule struct {
|
||||
Delay time.Duration
|
||||
}
|
||||
|
||||
// Every returns a crontab Schedule that activates once every duration.
|
||||
// Delays of less than a second are not supported (will round up to 1 second).
|
||||
// Any fields less than a Second are truncated.
|
||||
func Every(duration time.Duration) ConstantDelaySchedule {
|
||||
if duration < time.Second {
|
||||
duration = time.Second
|
||||
}
|
||||
return ConstantDelaySchedule{
|
||||
Delay: duration - time.Duration(duration.Nanoseconds())%time.Second,
|
||||
}
|
||||
}
|
||||
|
||||
// Next returns the next time this should be run.
|
||||
// This rounds so that the next activation time will be on the second.
|
||||
func (schedule ConstantDelaySchedule) Next(t time.Time) time.Time {
|
||||
return t.Add(schedule.Delay - time.Duration(t.Nanosecond())*time.Nanosecond)
|
||||
}
|
||||
|
||||
// Schedule describes a job's duty cycle.
|
||||
type Schedule interface {
|
||||
// Next returns the next activation time, later than the given time.
|
||||
// Next is invoked initially, and then each time the job is run.
|
||||
Next(time.Time) time.Time
|
||||
}
|
||||
Reference in New Issue
Block a user