From 60969c69a7f132e9c1eb87201bc2fdee6bd64af1 Mon Sep 17 00:00:00 2001
From: whyrusleeping <why@ipfs.io>
Date: Wed, 8 Jan 2020 20:27:14 -0800
Subject: [PATCH] implement a mocked out sectorbuilder, probably not useful yet

---
 storage/sbmock/sbmock.go | 121 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 storage/sbmock/sbmock.go

diff --git a/storage/sbmock/sbmock.go b/storage/sbmock/sbmock.go
new file mode 100644
index 000000000..a46ec5bfa
--- /dev/null
+++ b/storage/sbmock/sbmock.go
@@ -0,0 +1,121 @@
+package sbmock
+
+import (
+	"io"
+	"io/ioutil"
+	"math/rand"
+	"sync"
+
+	"github.com/filecoin-project/go-sectorbuilder"
+	"golang.org/x/xerrors"
+)
+
+func randComm() [sectorbuilder.CommLen]byte {
+	var out [sectorbuilder.CommLen]byte
+	rand.Read(out[:])
+	return out
+}
+
+type SBMock struct {
+	sectors      map[uint64]*sectorState
+	sectorSize   uint64
+	nextSectorID uint64
+	rateLimit    chan struct{}
+
+	lk sync.Mutex
+}
+
+func NewMockSectorBuilder(threads int, ssize uint64) *SBMock {
+	return &SBMock{
+		sectors:      make(map[uint64]*sectorState),
+		sectorSize:   ssize,
+		nextSectorID: 0,
+		rateLimit:    make(chan struct{}, threads),
+	}
+}
+
+type sectorState struct {
+	pieces [][]byte
+}
+
+func (sb *SBMock) RateLimit() func() {
+	sb.rateLimit <- struct{}{}
+
+	// TODO: probably want to copy over rate limit code
+	return func() {
+		<-sb.rateLimit
+	}
+}
+
+func (sb *SBMock) AddPiece(size uint64, sectorId uint64, r io.Reader, existingPieces []uint64) (sectorbuilder.PublicPieceInfo, error) {
+	sb.lk.Lock()
+	defer sb.lk.Unlock()
+
+	ss, ok := sb.sectors[sectorId]
+	if !ok {
+		ss = &sectorState{}
+		sb.sectors[sectorId] = ss
+	}
+
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return sectorbuilder.PublicPieceInfo{}, err
+	}
+
+	ss.pieces = append(ss.pieces, b)
+	return sectorbuilder.PublicPieceInfo{
+		Size: size,
+		// TODO: should we compute a commP? maybe do it when we need it
+	}, nil
+}
+
+func (sb *SBMock) SectorSize() uint64 {
+	return sb.sectorSize
+}
+
+func (sb *SBMock) AcquireSectorId() (uint64, error) {
+	sb.lk.Lock()
+	sb.lk.Unlock()
+	id := sb.nextSectorID
+	sb.nextSectorID++
+	return id, nil
+}
+
+func (sb *SBMock) Scrub(sectorbuilder.SortedPublicSectorInfo) []*sectorbuilder.Fault {
+	return nil
+}
+
+func (sb *SBMock) GenerateFallbackPoSt(sectorbuilder.SortedPublicSectorInfo, [sectorbuilder.CommLen]byte, []uint64) ([]sectorbuilder.EPostCandidate, []byte, error) {
+	panic("NYI")
+}
+
+func (sb *SBMock) SealPreCommit(sid uint64, ticket sectorbuilder.SealTicket, pieces []sectorbuilder.PublicPieceInfo) (sectorbuilder.RawSealPreCommitOutput, error) {
+	_, ok := sb.sectors[sid]
+	if !ok {
+		return sectorbuilder.RawSealPreCommitOutput{}, xerrors.Errorf("no sector with id %d in sectorbuilder", sid)
+	}
+
+	ussize := sectorbuilder.UserBytesForSectorSize(sb.sectorSize)
+
+	// TODO: verify pieces in sinfo.pieces match passed in pieces
+
+	var sum uint64
+	for _, p := range pieces {
+		sum += p.Size
+	}
+
+	if sum != ussize {
+		return sectorbuilder.RawSealPreCommitOutput{}, xerrors.Errorf("aggregated piece sizes don't match up: %d != %d", sum, ussize)
+	}
+
+	return sectorbuilder.RawSealPreCommitOutput{
+		CommD: randComm(),
+		CommR: randComm(),
+	}, nil
+}
+
+func (sb *SBMock) SealCommit(sid uint64, ticket sectorbuilder.SealTicket, seed sectorbuilder.SealSeed, pieces []sectorbuilder.PublicPieceInfo, precommit sectorbuilder.RawSealPreCommitOutput) ([]byte, error) {
+	buf := make([]byte, 32)
+	rand.Read(buf)
+	return buf, nil
+}