leveldb

Documentation

Overview

Package leveldb provides functions to trace the syndtr/goleveldb package (https://github.com/syndtr/goleveldb).

Example

package main

import (
	"context"

	leveldbtrace "github.com/DataDog/dd-trace-go/v2/contrib/syndtr/goleveldb/leveldb"
	"github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
)

func main() {
	db, _ := leveldbtrace.OpenFile("/tmp/example.leveldb", nil)

	// Create a root span, giving name, server and resource.
	_, ctx := tracer.StartSpanFromContext(context.Background(), "my-query",
		tracer.ServiceName("my-db"),
		tracer.ResourceName("initial-access"),
	)

	// use WithContext to associate the span with the parent
	db.WithContext(ctx).
		// calls will be traced
		Put([]byte("key"), []byte("value"), nil)
}

Index

• type DB
  • func Open(stor storage.Storage, o *opt.Options, opts ...Option) (*DB, error)
  • func OpenFile(path string, o *opt.Options, opts ...Option) (*DB, error)
  • func WrapDB(db *leveldb.DB, opts ...Option) *DB
  • func (db *DB) CompactRange(r util.Range) error
  • func (db *DB) Delete(key []byte, wo *opt.WriteOptions) error
  • func (db *DB) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)
  • func (db *DB) GetSnapshot() (*Snapshot, error)
  • func (db *DB) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)
  • func (db *DB) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
  • func (db *DB) OpenTransaction() (*Transaction, error)
  • func (db *DB) Put(key, value []byte, wo *opt.WriteOptions) error
  • func (db *DB) WithContext(ctx context.Context) *DB
  • func (db *DB) Write(batch *leveldb.Batch, wo *opt.WriteOptions) error
• type Iterator
  • func WrapIterator(it iterator.Iterator, opts ...Option) *Iterator
  • func (it *Iterator) Release()
• type Option
• type OptionFn
  • func WithAnalytics(on bool) OptionFn
  • func WithAnalyticsRate(rate float64) OptionFn
  • func WithContext(ctx context.Context) OptionFn
  • func WithService(serviceName string) OptionFn
• type Snapshot
  • func WrapSnapshot(snap *leveldb.Snapshot, opts ...Option) *Snapshot
  • func (snap *Snapshot) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)
  • func (snap *Snapshot) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)
  • func (snap *Snapshot) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
  • func (snap *Snapshot) WithContext(ctx context.Context) *Snapshot
• type Transaction
  • func WrapTransaction(tr *leveldb.Transaction, opts ...Option) *Transaction
  • func (tr *Transaction) Commit() error
  • func (tr *Transaction) Get(key []byte, ro *opt.ReadOptions) ([]byte, error)
  • func (tr *Transaction) Has(key []byte, ro *opt.ReadOptions) (bool, error)
  • func (tr *Transaction) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
  • func (tr *Transaction) WithContext(ctx context.Context) *Transaction

Examples

• Package

Types

type DB

type DB struct {
	*leveldb.DB
	// contains filtered or unexported fields
}

A DB wraps a leveldb.DB and traces all queries.

func Open

func Open(stor storage.Storage, o *opt.Options, opts ...Option) (*DB, error)

Open calls leveldb.Open and wraps the resulting DB.

func OpenFile

func OpenFile(path string, o *opt.Options, opts ...Option) (*DB, error)

OpenFile calls leveldb.OpenFile and wraps the resulting DB.

func WrapDB

func WrapDB(db *leveldb.DB, opts ...Option) *DB

WrapDB wraps a leveldb.DB so that queries are traced.

func (*DB) CompactRange

func (db *DB) CompactRange(r util.Range) error

CompactRange calls DB.CompactRange and traces the result.

func (*DB) Delete

func (db *DB) Delete(key []byte, wo *opt.WriteOptions) error

Delete calls DB.Delete and traces the result.

func (*DB) Get

func (db *DB) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)

Get calls DB.Get and traces the result.

func (*DB) GetSnapshot

func (db *DB) GetSnapshot() (*Snapshot, error)

GetSnapshot calls DB.GetSnapshot and returns a wrapped Snapshot.

func (*DB) Has

func (db *DB) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)

Has calls DB.Has and traces the result.

func (*DB) NewIterator

func (db *DB) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator

NewIterator calls DB.NewIterator and returns a wrapped Iterator.

func (*DB) OpenTransaction

func (db *DB) OpenTransaction() (*Transaction, error)

OpenTransaction calls DB.OpenTransaction and returns a wrapped Transaction.

func (*DB) Put

func (db *DB) Put(key, value []byte, wo *opt.WriteOptions) error

Put calls DB.Put and traces the result.

func (*DB) WithContext

func (db *DB) WithContext(ctx context.Context) *DB

WithContext returns a new DB with the context set to ctx.

func (*DB) Write

func (db *DB) Write(batch *leveldb.Batch, wo *opt.WriteOptions) error

Write calls DB.Write and traces the result.

type Iterator

type Iterator struct {
	iterator.Iterator
	// contains filtered or unexported fields
}

An Iterator wraps a leveldb.Iterator and traces until Release is called.

func WrapIterator

func WrapIterator(it iterator.Iterator, opts ...Option) *Iterator

WrapIterator wraps a leveldb.Iterator so that queries are traced.

func (*Iterator) Release

func (it *Iterator) Release()

Release calls Iterator.Release and traces the result.

type Option

type Option interface {
	// contains filtered or unexported methods
}

Option describes options for the LevelDB integration.

type OptionFn

type OptionFn func(*config)

OptionFn represents options applicable to Open, OpenFile, WrapDB, WrapIterator, WrapSnapshot and WrapTransaction.

func WithAnalytics

func WithAnalytics(on bool) OptionFn

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) OptionFn

WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.

func WithContext

func WithContext(ctx context.Context) OptionFn

WithContext sets the tracing context for the db.

func WithService

func WithService(serviceName string) OptionFn

WithService sets the given service name for the db.

type Snapshot

type Snapshot struct {
	*leveldb.Snapshot
	// contains filtered or unexported fields
}

A Snapshot wraps a leveldb.Snapshot and traces all queries.

func WrapSnapshot

func WrapSnapshot(snap *leveldb.Snapshot, opts ...Option) *Snapshot

WrapSnapshot wraps a leveldb.Snapshot so that queries are traced.

func (*Snapshot) Get

func (snap *Snapshot) Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)

Get calls Snapshot.Get and traces the result.

func (*Snapshot) Has

func (snap *Snapshot) Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)

Has calls Snapshot.Has and traces the result.

func (*Snapshot) NewIterator

func (snap *Snapshot) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator

NewIterator calls Snapshot.NewIterator and returns a wrapped Iterator.

func (*Snapshot) WithContext

func (snap *Snapshot) WithContext(ctx context.Context) *Snapshot

WithContext returns a new Snapshot with the context set to ctx.

type Transaction

type Transaction struct {
	*leveldb.Transaction
	// contains filtered or unexported fields
}

A Transaction wraps a leveldb.Transaction and traces all queries.

func WrapTransaction

func WrapTransaction(tr *leveldb.Transaction, opts ...Option) *Transaction

WrapTransaction wraps a leveldb.Transaction so that queries are traced.

func (*Transaction) Commit

func (tr *Transaction) Commit() error

Commit calls Transaction.Commit and traces the result.

func (*Transaction) Get

func (tr *Transaction) Get(key []byte, ro *opt.ReadOptions) ([]byte, error)

Get calls Transaction.Get and traces the result.

func (*Transaction) Has

func (tr *Transaction) Has(key []byte, ro *opt.ReadOptions) (bool, error)

Has calls Transaction.Has and traces the result.

func (*Transaction) NewIterator

func (tr *Transaction) NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator

NewIterator calls Transaction.NewIterator and returns a wrapped Iterator.

func (*Transaction) WithContext

func (tr *Transaction) WithContext(ctx context.Context) *Transaction

WithContext returns a new Transaction with the context set to ctx.