generated from RTradeLtd/repo-template
/
progressive_counter.go
258 lines (240 loc) · 6.07 KB
/
progressive_counter.go
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// Copyright 2020 RTrade Technologies Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sharedforeststore
import (
"context"
"sync"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-datastore"
"github.com/pkg/errors"
)
type ProgressiveCounted struct {
Counted
}
var _ ProgressiveCounterStore = (*ProgressiveCounted)(nil)
//NewProgressiveCountedStore creates a new ProgressiveCounted (implements ProgressiveCounterStore) from a transactional datastore.
func NewProgressiveCountedStore(ds datastore.TxnDatastore, opt *DatabaseOptions) *ProgressiveCounted {
return &ProgressiveCounted{
Counted: *NewCountedStore(ds, opt),
}
}
func (c *ProgressiveCounted) ProgressiveIncrement(ctx context.Context, id cid.Cid, bg BlockGetter) (ProgressManager, int64, error) {
var count int64
var meta metadata
err := c.txWarp(ctx, func(tx *Tx) (err error) {
var key counterKey
count, meta, key, err = getCount(tx.transaction, id)
if err != nil {
return err
}
count++
return setCount(tx.transaction, key, count, meta)
})
if err != nil {
return nil, 0, err
}
if meta.Complete {
return nil, count, nil
}
return c.ProgressiveContinue(ctx, id, bg), count, nil
}
var ErrProgressReverted = errors.New("progress was reverted by an other action")
var ErrRunOnce = errors.New("progress can only run once")
//StoreProgressManager implements ProgressManager
type StoreProgressManager struct {
err error
run func(context.Context) error
report ProgressReport
reportLock sync.RWMutex
}
//ProgressCompleted is a typed nil of *StoreProgressManager to indicate there is no progress to track
var ProgressCompleted ProgressManager = (*StoreProgressManager)(nil)
func (m *StoreProgressManager) Run(ctx context.Context) error {
if m == nil {
return nil
}
if m.err != nil {
return m.err
}
m.err = ErrRunOnce
return m.run(ctx)
}
func (m *StoreProgressManager) CopyReport(r *ProgressReport) error {
if m == nil {
return nil
}
m.reportLock.RLock()
defer m.reportLock.RUnlock()
*r = m.report
return nil
}
func (m *StoreProgressManager) updateReport(f func(r *ProgressReport)) {
m.reportLock.Lock()
defer m.reportLock.Unlock()
f(&(m.report))
}
func (c *ProgressiveCounted) ProgressiveContinue(ctx context.Context, id cid.Cid, bg BlockGetter) ProgressManager {
m := &StoreProgressManager{}
var r func(id cid.Cid) error // r is called recursively
r = func(id cid.Cid) error {
for {
cids, err := c.progressTx(ctx, id, bg, m)
if len(cids) == 0 || err != nil {
return err
}
for _, id := range cids {
if err := r(id); err != nil {
return err
}
}
}
}
m.run = func(ctx2 context.Context) error {
ctx = ctx2
return r(id)
}
return m
}
func (c *ProgressiveCounted) progressTx(ctx context.Context, id cid.Cid, bg BlockGetter, m *StoreProgressManager) ([]cid.Cid, error) {
var cids []cid.Cid
var size uint64
err := c.txWarp(ctx, func(tx *Tx) error {
count, meta, key, err := getCount(tx.transaction, id)
if err != nil {
return err
}
if count == 0 {
return ErrProgressReverted
}
if meta.Complete {
cids = nil
return nil
}
getter := bg
if meta.HavePart {
getter = c
}
data, err := getter.GetBlock(ctx, id)
if err != nil {
return err
}
if !meta.HavePart {
if err := tx.transaction.Put(getDataKey(id), data); err != nil {
return err
}
}
var allLinks []cid.Cid
if allLinks, size, err = c.opt.LinkDecoder(id, data); err != nil {
return err
}
if cids == nil {
cids = make([]cid.Cid, 0, len(allLinks))
} else {
cids = cids[:0]
}
increment := !meta.HavePart
for _, link := range allLinks {
if ctx.Err() != nil {
return ctx.Err()
}
count, meta, key, err := getCount(tx.transaction, link)
if err != nil {
return err
}
if increment {
count++
if err := setCount(tx.transaction, key, count, meta); err != nil {
return err
}
}
if !meta.Complete {
cids = append(cids, link)
}
}
if len(cids) == 0 {
if err := setCount(tx.transaction, key, count, metadata{Complete: true, HavePart: true}); err != nil {
return err
}
} else if !meta.HavePart {
if err := setCount(tx.transaction, key, count, metadata{Complete: false, HavePart: true}); err != nil {
return err
}
}
return nil
})
if err != nil {
return nil, err
}
m.updateReport(func(r *ProgressReport) {
if !r.initalized {
r.initalized = true
if size != 0 {
r.KnownBytes = size
}
}
if len(cids) == 0 {
r.HaveBytes = size
}
})
return cids, nil
}
var ErrSizeNotSupported = errors.New("size not supported")
func (c *ProgressiveCounted) GetProgressReport(ctx context.Context, id cid.Cid, r *ProgressReport) error {
*r = ProgressReport{initalized: true} //reset
data, err := c.GetBlock(ctx, id)
if err != nil {
if err == datastore.ErrNotFound {
return nil //block not found reports zero progress
}
return err
}
_, size, err := c.opt.LinkDecoder(id, data)
if err != nil {
return err
}
if size == 0 {
return ErrSizeNotSupported
}
r.KnownBytes = size
var sum func(cid.Cid) (uint64, error)
sum = func(id cid.Cid) (uint64, error) {
_, meta, _, err := getCount(c.ds, id)
if err != nil {
return 0, err
}
if !meta.HavePart {
return 0, nil
}
data, err := c.GetBlock(ctx, id)
if err != nil {
return 0, err
}
cids, size, err := c.opt.LinkDecoder(id, data)
if err != nil {
return 0, err
}
if meta.Complete {
return size, nil
} else {
size = 0
for _, id := range cids {
n, _ := sum(id) //ignore error here so we add as much as possible
size += n
}
return size, nil
}
}
r.HaveBytes, err = sum(id)
return err
}