[#4] *: Add connections, neofs, logger from httpgw
Commit in http-gw: a4ad52e181e3653ee43742e2beb8c594c487c8cc Rename connections dir and pkg to pool Signed-off-by: Angira Kekteeva <kira@nspcc.ru>
This commit is contained in:
Angira Kekteeva
parent
9dee13f0d5
commit
4225a21ea5
7 changed files with 741 additions and 0 deletions
78
pkg/logger/grpc.go
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78
pkg/logger/grpc.go
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@ -0,0 +1,78 @@
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package logger
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import (
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"go.uber.org/zap"
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"go.uber.org/zap/zapcore"
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"google.golang.org/grpc/grpclog"
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)
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type (
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zapLogger struct {
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zapcore.Core
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log *zap.SugaredLogger
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}
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// Logger includes grpclog.LoggerV2 interface with an additional
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// Println method.
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Logger interface {
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grpclog.LoggerV2
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Println(v ...interface{})
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}
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)
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// GRPC wraps given zap.Logger into grpclog.LoggerV2+ interface.
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func GRPC(l *zap.Logger) Logger {
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log := l.WithOptions(
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// skip gRPCLog + zapLogger in caller
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zap.AddCallerSkip(2))
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return &zapLogger{
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Core: log.Core(),
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log: log.Sugar(),
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}
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}
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// Info implements grpclog.LoggerV2.
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func (z *zapLogger) Info(args ...interface{}) { z.log.Info(args...) }
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// Infoln implements grpclog.LoggerV2.
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func (z *zapLogger) Infoln(args ...interface{}) { z.log.Info(args...) }
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// Infof implements grpclog.LoggerV2.
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func (z *zapLogger) Infof(format string, args ...interface{}) { z.log.Infof(format, args...) }
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// Println allows to print a line with info severity.
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func (z *zapLogger) Println(args ...interface{}) { z.log.Info(args...) }
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// Printf implements grpclog.LoggerV2.
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func (z *zapLogger) Printf(format string, args ...interface{}) { z.log.Infof(format, args...) }
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// Warning implements grpclog.LoggerV2.
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func (z *zapLogger) Warning(args ...interface{}) { z.log.Warn(args...) }
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// Warningln implements grpclog.LoggerV2.
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func (z *zapLogger) Warningln(args ...interface{}) { z.log.Warn(args...) }
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// Warningf implements grpclog.LoggerV2.
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func (z *zapLogger) Warningf(format string, args ...interface{}) { z.log.Warnf(format, args...) }
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// Error implements grpclog.LoggerV2.
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func (z *zapLogger) Error(args ...interface{}) { z.log.Error(args...) }
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// Errorln implements grpclog.LoggerV2.
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func (z *zapLogger) Errorln(args ...interface{}) { z.log.Error(args...) }
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// Errorf implements grpclog.LoggerV2.
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func (z *zapLogger) Errorf(format string, args ...interface{}) { z.log.Errorf(format, args...) }
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// Fatal implements grpclog.LoggerV2.
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func (z *zapLogger) Fatal(args ...interface{}) { z.log.Fatal(args...) }
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// Fatalln implements grpclog.LoggerV2.
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func (z *zapLogger) Fatalln(args ...interface{}) { z.log.Fatal(args...) }
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// Fatalf implements grpclog.LoggerV2.
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func (z *zapLogger) Fatalf(format string, args ...interface{}) { z.log.Fatalf(format, args...) }
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// V implements grpclog.LoggerV2.
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func (z *zapLogger) V(int) bool { return z.Enabled(zapcore.DebugLevel) }
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33
pkg/logger/option.go
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33
pkg/logger/option.go
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@ -0,0 +1,33 @@
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package logger
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import "go.uber.org/zap"
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// WithSamplingInitial returns Option that sets sampling initial parameter.
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func WithSamplingInitial(v int) Option { return func(o *options) { o.SamplingInitial = v } }
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// WithSamplingThereafter returns Option that sets sampling thereafter parameter.
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func WithSamplingThereafter(v int) Option { return func(o *options) { o.SamplingThereafter = v } }
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// WithFormat returns Option that sets format parameter.
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func WithFormat(v string) Option { return func(o *options) { o.Format = v } }
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// WithLevel returns Option that sets Level parameter.
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func WithLevel(v string) Option { return func(o *options) { o.Level = v } }
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// WithTraceLevel returns Option that sets trace level parameter.
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func WithTraceLevel(v string) Option { return func(o *options) { o.TraceLevel = v } }
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// WithoutDisclaimer returns Option that disables disclaimer.
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func WithoutDisclaimer() Option { return func(o *options) { o.NoDisclaimer = true } }
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// WithoutCaller returns Option that disables caller printing.
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func WithoutCaller() Option { return func(o *options) { o.NoCaller = true } }
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// WithAppName returns Option that sets application name.
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func WithAppName(v string) Option { return func(o *options) { o.AppName = v } }
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// WithAppVersion returns Option that sets application version.
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func WithAppVersion(v string) Option { return func(o *options) { o.AppVersion = v } }
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// WithZapOptions returns Option that sets zap logger options.
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func WithZapOptions(opts ...zap.Option) Option { return func(o *options) { o.Options = opts } }
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134
pkg/logger/zap.go
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134
pkg/logger/zap.go
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package logger
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import (
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"strings"
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"go.uber.org/zap"
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"go.uber.org/zap/zapcore"
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)
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type (
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// Option represents logger option setter.
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Option func(o *options)
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options struct {
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Options []zap.Option
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SamplingInitial int
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SamplingThereafter int
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Format string
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Level string
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TraceLevel string
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NoCaller bool
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NoDisclaimer bool
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AppName string
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AppVersion string
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}
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)
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const (
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formatJSON = "json"
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formatConsole = "console"
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defaultSamplingInitial = 100
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defaultSamplingThereafter = 100
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lvlInfo = "info"
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lvlWarn = "warn"
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lvlDebug = "debug"
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lvlError = "error"
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lvlFatal = "fatal"
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lvlPanic = "panic"
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)
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func safeLevel(lvl string) zap.AtomicLevel {
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switch strings.ToLower(lvl) {
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case lvlDebug:
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return zap.NewAtomicLevelAt(zap.DebugLevel)
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case lvlWarn:
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return zap.NewAtomicLevelAt(zap.WarnLevel)
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case lvlError:
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return zap.NewAtomicLevelAt(zap.ErrorLevel)
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case lvlFatal:
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return zap.NewAtomicLevelAt(zap.FatalLevel)
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case lvlPanic:
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return zap.NewAtomicLevelAt(zap.PanicLevel)
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default:
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return zap.NewAtomicLevelAt(zap.InfoLevel)
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}
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}
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func defaults() *options {
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return &options{
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SamplingInitial: defaultSamplingInitial,
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SamplingThereafter: defaultSamplingThereafter,
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Format: formatConsole,
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Level: lvlDebug,
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TraceLevel: lvlInfo,
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NoCaller: false,
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NoDisclaimer: false,
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AppName: "",
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AppVersion: "",
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}
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}
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// New returns new zap.Logger using all options specified and stdout used
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// for output.
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func New(opts ...Option) (*zap.Logger, error) {
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o := defaults()
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c := zap.NewProductionConfig()
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c.OutputPaths = []string{"stdout"}
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c.ErrorOutputPaths = []string{"stdout"}
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for _, opt := range opts {
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opt(o)
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}
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// set sampling
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c.Sampling = &zap.SamplingConfig{
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Initial: o.SamplingInitial,
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Thereafter: o.SamplingThereafter,
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}
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// logger level
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c.Level = safeLevel(o.Level)
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traceLvl := safeLevel(o.TraceLevel)
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// logger format
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switch f := o.Format; strings.ToLower(f) {
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case formatConsole:
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c.Encoding = formatConsole
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default:
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c.Encoding = formatJSON
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}
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// logger time
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c.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
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if o.NoCaller {
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c.EncoderConfig.EncodeCaller = nil
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}
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// enable trace only for current log-level
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o.Options = append(o.Options, zap.AddStacktrace(traceLvl))
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l, err := c.Build(o.Options...)
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if err != nil {
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return nil, err
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}
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if o.NoDisclaimer {
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return l, nil
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}
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return l.With(
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zap.String("app_name", o.AppName),
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zap.String("app_version", o.AppVersion)), nil
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}
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177
pkg/neofs/client-plant.go
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177
pkg/neofs/client-plant.go
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package neofs
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import (
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"context"
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"crypto/ecdsa"
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"io"
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"github.com/nspcc-dev/neofs-api-go/pkg/client"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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"github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/nspcc-dev/neofs-api-go/pkg/owner"
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"github.com/nspcc-dev/neofs-api-go/pkg/token"
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"github.com/nspcc-dev/neofs-http-gw/connections"
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)
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// BaseOptions represents basic NeoFS request options.
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type BaseOptions struct {
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Client client.Client
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SessionToken *token.SessionToken
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BearerToken *token.BearerToken
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}
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// PutOptions represents NeoFS Put request options.
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type PutOptions struct {
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BaseOptions
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Attributes []*object.Attribute
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ContainerID *container.ID
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OwnerID *owner.ID
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Reader io.Reader
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}
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// GetOptions represents NeoFS Get request options.
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type GetOptions struct {
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BaseOptions
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ObjectAddress *object.Address
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Writer io.Writer
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}
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// SearchOptions represents NeoFS Search request options.
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type SearchOptions struct {
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BaseOptions
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ContainerID *container.ID
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Attribute struct {
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Key string
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Value string
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}
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}
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// DeleteOptions represents NeoFS Delete request options.
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type DeleteOptions struct {
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BaseOptions
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ObjectAddress *object.Address
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}
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// ObjectClient wraps basic NeoFS requests.
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type ObjectClient interface {
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Put(context.Context, *PutOptions) (*object.Address, error)
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Get(context.Context, *GetOptions) (*object.Object, error)
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Search(context.Context, *SearchOptions) ([]*object.ID, error)
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Delete(context.Context, *DeleteOptions) error
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}
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// ClientPlant provides connections to NeoFS nodes from pool and allows to
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// get local owner ID.
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type ClientPlant interface {
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ConnectionArtifacts() (client.Client, *token.SessionToken, error)
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Object() ObjectClient
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OwnerID() *owner.ID
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}
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type neofsObjectClient struct {
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key *ecdsa.PrivateKey
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pool connections.Pool
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}
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type neofsClientPlant struct {
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key *ecdsa.PrivateKey
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ownerID *owner.ID
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pool connections.Pool
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}
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// ConnectionArtifacts returns connection from pool.
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func (cp *neofsClientPlant) ConnectionArtifacts() (client.Client, *token.SessionToken, error) {
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return cp.pool.ConnectionArtifacts()
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}
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// Object returns ObjectClient instance from plant.
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func (cp *neofsClientPlant) Object() ObjectClient {
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return &neofsObjectClient{
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key: cp.key,
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pool: cp.pool,
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}
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}
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// OwnerID returns plant's owner ID.
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func (cp *neofsClientPlant) OwnerID() *owner.ID {
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return cp.ownerID
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}
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// NewClientPlant creates new ClientPlant from given context, pool and credentials.
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func NewClientPlant(ctx context.Context, pool connections.Pool, creds Credentials) (ClientPlant, error) {
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return &neofsClientPlant{key: creds.PrivateKey(), ownerID: creds.Owner(), pool: pool}, nil
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}
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// Put does NeoFS Put request, returning new object address if successful.
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func (oc *neofsObjectClient) Put(ctx context.Context, options *PutOptions) (*object.Address, error) {
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var (
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err error
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objectID *object.ID
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)
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address := object.NewAddress()
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rawObject := object.NewRaw()
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rawObject.SetContainerID(options.ContainerID)
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rawObject.SetOwnerID(options.OwnerID)
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rawObject.SetAttributes(options.Attributes...)
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ops := new(client.PutObjectParams).
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WithObject(rawObject.Object()).
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WithPayloadReader(options.Reader)
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objectID, err = options.Client.PutObject(
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ctx,
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ops,
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client.WithSession(options.SessionToken),
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client.WithBearer(options.BearerToken),
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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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address.SetObjectID(objectID)
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address.SetContainerID(options.ContainerID)
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return address, nil
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}
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// Get does NeoFS Get request, returning an object received if successful.
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func (oc *neofsObjectClient) Get(ctx context.Context, options *GetOptions) (*object.Object, error) {
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var (
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err error
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obj *object.Object
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)
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ops := new(client.GetObjectParams).
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WithAddress(options.ObjectAddress).
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WithPayloadWriter(options.Writer)
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obj, err = options.Client.GetObject(
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ctx,
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ops,
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client.WithSession(options.SessionToken),
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client.WithBearer(options.BearerToken),
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)
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return obj, err
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}
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// Search does NeoFS Search request, returning object IDs if successful.
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func (oc *neofsObjectClient) Search(ctx context.Context, options *SearchOptions) ([]*object.ID, error) {
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sfs := object.NewSearchFilters()
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sfs.AddRootFilter()
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sfs.AddFilter(options.Attribute.Key, options.Attribute.Value, object.MatchStringEqual)
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sops := new(client.SearchObjectParams)
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sops.WithContainerID(options.ContainerID)
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sops.WithSearchFilters(sfs)
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return options.Client.SearchObject(
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ctx,
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sops,
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client.WithSession(options.SessionToken),
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client.WithBearer(options.BearerToken),
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)
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}
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// Delete deletes NeoFS object.
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func (oc *neofsObjectClient) Delete(ctx context.Context, options *DeleteOptions) error {
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ops := new(client.DeleteObjectParams).WithAddress(options.ObjectAddress)
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err := options.Client.DeleteObject(
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ctx,
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ops,
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client.WithSession(options.SessionToken),
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client.WithBearer(options.BearerToken),
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)
|
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return err
|
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}
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78
pkg/neofs/credentials.go
Normal file
78
pkg/neofs/credentials.go
Normal file
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package neofs
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|
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"math/big"
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|
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"github.com/nspcc-dev/neofs-api-go/pkg/owner"
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crypto "github.com/nspcc-dev/neofs-crypto"
|
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)
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|
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type (
|
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// Credentials contains methods that needed to work with NeoFS.
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Credentials interface {
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Owner() *owner.ID
|
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PublicKey() *ecdsa.PublicKey
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PrivateKey() *ecdsa.PrivateKey
|
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}
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|
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credentials struct {
|
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key *ecdsa.PrivateKey
|
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ownerID *owner.ID
|
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}
|
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)
|
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|
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// NewCredentials creates an instance of Credentials through string
|
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// representation of secret. It allows passing WIF, path, hex-encoded and others.
|
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func NewCredentials(secret string) (Credentials, error) {
|
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key, err := crypto.LoadPrivateKey(secret)
|
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if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return setFromPrivateKey(key)
|
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}
|
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|
||||
// NewEphemeralCredentials creates new private key and Credentials based on that
|
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// key.
|
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func NewEphemeralCredentials() (Credentials, error) {
|
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c := elliptic.P256()
|
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priv, x, y, err := elliptic.GenerateKey(c, rand.Reader)
|
||||
if err != nil {
|
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return nil, err
|
||||
}
|
||||
key := &ecdsa.PrivateKey{
|
||||
PublicKey: ecdsa.PublicKey{
|
||||
Curve: c,
|
||||
X: x,
|
||||
Y: y,
|
||||
},
|
||||
D: new(big.Int).SetBytes(priv),
|
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}
|
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return setFromPrivateKey(key)
|
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}
|
||||
|
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// PrivateKey returns ecdsa.PrivateKey.
|
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func (c *credentials) PrivateKey() *ecdsa.PrivateKey {
|
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return c.key
|
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}
|
||||
|
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// PublicKey returns ecdsa.PublicKey.
|
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func (c *credentials) PublicKey() *ecdsa.PublicKey {
|
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return &c.key.PublicKey
|
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}
|
||||
|
||||
// Owner returns owner.ID.
|
||||
func (c *credentials) Owner() *owner.ID {
|
||||
return c.ownerID
|
||||
}
|
||||
|
||||
func setFromPrivateKey(key *ecdsa.PrivateKey) (*credentials, error) {
|
||||
wallet, err := owner.NEO3WalletFromPublicKey(&key.PublicKey)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ownerID := owner.NewIDFromNeo3Wallet(wallet)
|
||||
return &credentials{key: key, ownerID: ownerID}, nil
|
||||
}
|
||||
160
pkg/pool/pool.go
Normal file
160
pkg/pool/pool.go
Normal file
|
|
@ -0,0 +1,160 @@
|
|||
package pool
|
||||
|
||||
import (
|
||||
"context"
|
||||
"crypto/ecdsa"
|
||||
"errors"
|
||||
"fmt"
|
||||
"math/rand"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/nspcc-dev/neofs-api-go/pkg/client"
|
||||
"github.com/nspcc-dev/neofs-api-go/pkg/token"
|
||||
"google.golang.org/grpc"
|
||||
"google.golang.org/grpc/keepalive"
|
||||
)
|
||||
|
||||
// PoolBuilderOptions contains options used to build connection pool.
|
||||
type PoolBuilderOptions struct {
|
||||
Key *ecdsa.PrivateKey
|
||||
NodeConnectionTimeout time.Duration
|
||||
NodeRequestTimeout time.Duration
|
||||
ClientRebalanceInterval time.Duration
|
||||
KeepaliveTime time.Duration
|
||||
KeepaliveTimeout time.Duration
|
||||
KeepalivePermitWoStream bool
|
||||
SessionExpirationEpoch uint64
|
||||
weights []float64
|
||||
connections []*grpc.ClientConn
|
||||
}
|
||||
|
||||
// PoolBuilder is an interim structure used to collect node addresses/weights and
|
||||
// build connection pool subsequently.
|
||||
type PoolBuilder struct {
|
||||
addresses []string
|
||||
weights []float64
|
||||
}
|
||||
|
||||
// AddNode adds address/weight pair to node PoolBuilder list.
|
||||
func (pb *PoolBuilder) AddNode(address string, weight float64) *PoolBuilder {
|
||||
pb.addresses = append(pb.addresses, address)
|
||||
pb.weights = append(pb.weights, weight)
|
||||
return pb
|
||||
}
|
||||
|
||||
// Build creates new pool based on current PoolBuilder state and options.
|
||||
func (pb *PoolBuilder) Build(ctx context.Context, options *PoolBuilderOptions) (Pool, error) {
|
||||
if len(pb.addresses) == 0 {
|
||||
return nil, errors.New("no NeoFS peers configured")
|
||||
}
|
||||
totalWeight := 0.0
|
||||
for _, w := range pb.weights {
|
||||
totalWeight += w
|
||||
}
|
||||
for i, w := range pb.weights {
|
||||
pb.weights[i] = w / totalWeight
|
||||
}
|
||||
var cons = make([]*grpc.ClientConn, len(pb.addresses))
|
||||
for i, address := range pb.addresses {
|
||||
con, err := func() (*grpc.ClientConn, error) {
|
||||
toctx, c := context.WithTimeout(ctx, options.NodeConnectionTimeout)
|
||||
defer c()
|
||||
return grpc.DialContext(toctx, address,
|
||||
grpc.WithInsecure(),
|
||||
grpc.WithBlock(),
|
||||
grpc.WithKeepaliveParams(keepalive.ClientParameters{
|
||||
Time: options.KeepaliveTime,
|
||||
Timeout: options.KeepaliveTimeout,
|
||||
PermitWithoutStream: options.KeepalivePermitWoStream,
|
||||
}),
|
||||
)
|
||||
}()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
cons[i] = con
|
||||
}
|
||||
options.weights = pb.weights
|
||||
options.connections = cons
|
||||
return new(ctx, options)
|
||||
}
|
||||
|
||||
// Pool is an interface providing connection artifacts on request.
|
||||
type Pool interface {
|
||||
ConnectionArtifacts() (client.Client, *token.SessionToken, error)
|
||||
}
|
||||
|
||||
type clientPack struct {
|
||||
client client.Client
|
||||
sessionToken *token.SessionToken
|
||||
healthy bool
|
||||
}
|
||||
|
||||
type pool struct {
|
||||
lock sync.RWMutex
|
||||
sampler *Sampler
|
||||
clientPacks []*clientPack
|
||||
}
|
||||
|
||||
func new(ctx context.Context, options *PoolBuilderOptions) (Pool, error) {
|
||||
clientPacks := make([]*clientPack, len(options.weights))
|
||||
for i, con := range options.connections {
|
||||
c, err := client.New(client.WithDefaultPrivateKey(options.Key), client.WithGRPCConnection(con))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
st, err := c.CreateSession(ctx, options.SessionExpirationEpoch)
|
||||
if err != nil {
|
||||
address := "unknown"
|
||||
if epi, err := c.EndpointInfo(ctx); err == nil {
|
||||
address = epi.NodeInfo().Address()
|
||||
}
|
||||
return nil, fmt.Errorf("failed to create neofs session token for client %s: %w", address, err)
|
||||
}
|
||||
clientPacks[i] = &clientPack{client: c, sessionToken: st, healthy: true}
|
||||
}
|
||||
source := rand.NewSource(time.Now().UnixNano())
|
||||
sampler := NewSampler(options.weights, source)
|
||||
pool := &pool{sampler: sampler, clientPacks: clientPacks}
|
||||
go func() {
|
||||
ticker := time.NewTimer(options.ClientRebalanceInterval)
|
||||
for range ticker.C {
|
||||
ok := true
|
||||
for i, clientPack := range pool.clientPacks {
|
||||
func() {
|
||||
tctx, c := context.WithTimeout(ctx, options.NodeRequestTimeout)
|
||||
defer c()
|
||||
if _, err := clientPack.client.EndpointInfo(tctx); err != nil {
|
||||
ok = false
|
||||
}
|
||||
pool.lock.Lock()
|
||||
pool.clientPacks[i].healthy = ok
|
||||
pool.lock.Unlock()
|
||||
}()
|
||||
}
|
||||
ticker.Reset(options.ClientRebalanceInterval)
|
||||
}
|
||||
}()
|
||||
return pool, nil
|
||||
}
|
||||
|
||||
func (p *pool) ConnectionArtifacts() (client.Client, *token.SessionToken, error) {
|
||||
p.lock.RLock()
|
||||
defer p.lock.RUnlock()
|
||||
if len(p.clientPacks) == 1 {
|
||||
cp := p.clientPacks[0]
|
||||
if cp.healthy {
|
||||
return cp.client, cp.sessionToken, nil
|
||||
}
|
||||
return nil, nil, errors.New("no healthy client")
|
||||
}
|
||||
attempts := 3 * len(p.clientPacks)
|
||||
for k := 0; k < attempts; k++ {
|
||||
i := p.sampler.Next()
|
||||
if cp := p.clientPacks[i]; cp.healthy {
|
||||
return cp.client, cp.sessionToken, nil
|
||||
}
|
||||
}
|
||||
return nil, nil, errors.New("no healthy client")
|
||||
}
|
||||
81
pkg/pool/sampler.go
Normal file
81
pkg/pool/sampler.go
Normal file
|
|
@ -0,0 +1,81 @@
|
|||
package pool
|
||||
|
||||
import "math/rand"
|
||||
|
||||
// Sampler implements weighted random number generation using Vose's Alias
|
||||
// Method (https://www.keithschwarz.com/darts-dice-coins/).
|
||||
type Sampler struct {
|
||||
randomGenerator *rand.Rand
|
||||
probabilities []float64
|
||||
alias []int
|
||||
}
|
||||
|
||||
// NewSampler creates new Sampler with a given set of probabilities using
|
||||
// given source of randomness. Created Sampler will produce numbers from
|
||||
// 0 to len(probabilities).
|
||||
func NewSampler(probabilities []float64, source rand.Source) *Sampler {
|
||||
sampler := &Sampler{}
|
||||
var (
|
||||
small workList
|
||||
large workList
|
||||
)
|
||||
n := len(probabilities)
|
||||
sampler.randomGenerator = rand.New(source)
|
||||
sampler.probabilities = make([]float64, n)
|
||||
sampler.alias = make([]int, n)
|
||||
// Compute scaled probabilities.
|
||||
p := make([]float64, n)
|
||||
for i := 0; i < n; i++ {
|
||||
p[i] = probabilities[i] * float64(n)
|
||||
}
|
||||
for i, pi := range p {
|
||||
if pi < 1 {
|
||||
small.add(i)
|
||||
} else {
|
||||
large.add(i)
|
||||
}
|
||||
}
|
||||
for len(small) > 0 && len(large) > 0 {
|
||||
l, g := small.remove(), large.remove()
|
||||
sampler.probabilities[l] = p[l]
|
||||
sampler.alias[l] = g
|
||||
p[g] = p[g] + p[l] - 1
|
||||
if p[g] < 1 {
|
||||
small.add(g)
|
||||
} else {
|
||||
large.add(g)
|
||||
}
|
||||
}
|
||||
for len(large) > 0 {
|
||||
g := large.remove()
|
||||
sampler.probabilities[g] = 1
|
||||
}
|
||||
for len(small) > 0 {
|
||||
l := small.remove()
|
||||
sampler.probabilities[l] = 1
|
||||
}
|
||||
return sampler
|
||||
}
|
||||
|
||||
// Next returns the next (not so) random number from Sampler.
|
||||
func (g *Sampler) Next() int {
|
||||
n := len(g.alias)
|
||||
i := g.randomGenerator.Intn(n)
|
||||
if g.randomGenerator.Float64() < g.probabilities[i] {
|
||||
return i
|
||||
}
|
||||
return g.alias[i]
|
||||
}
|
||||
|
||||
type workList []int
|
||||
|
||||
func (wl *workList) add(e int) {
|
||||
*wl = append(*wl, e)
|
||||
}
|
||||
|
||||
func (wl *workList) remove() int {
|
||||
l := len(*wl) - 1
|
||||
n := (*wl)[l]
|
||||
*wl = (*wl)[:l]
|
||||
return n
|
||||
}
|
||||
Loading…
Reference in a new issue