Move compressor instantiation to ChannelConfig

op-batcher/batcher/channel_builder.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"math"
 
+	"github.com/ethereum-optimism/optimism/op-batcher/flags"
 	"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
 	"github.com/ethereum/go-ethereum/core/types"
 )
@@ -32,8 +33,6 @@ func (e *ChannelFullError) Unwrap() error {
 	return e.Err
 }
 
-type CompressorFactory func() (derive.Compressor, error)
-
 type ChannelConfig struct {
 	// Number of epochs (L1 blocks) per sequencing window, including the epoch
 	// L1 origin block itself
@@ -56,8 +55,21 @@ type ChannelConfig struct {
 	SubSafetyMargin uint64
 	// The maximum byte-size a frame can have.
 	MaxFrameSize uint64
-	// CompressorFactory creates Compressors used to compress frame data.
-	CompressorFactory CompressorFactory
+	// The target number of frames to create per channel. Note that if the
+	// realized compression ratio is worse than the approximate, more frames may
+	// actually be created. This also depends on how close TargetFrameSize is to
+	// MaxFrameSize.
+	TargetFrameSize uint64
+	// The target number of frames to create in this channel. If the realized
+	// compression ratio is worse than approxComprRatio, additional leftover
+	// frame(s) might get created.
+	TargetNumFrames int
+	// Approximated compression ratio to assume. Should be slightly smaller than
+	// average from experiments to avoid the chances of creating a small
+	// additional leftover frame.
+	ApproxComprRatio float64
+	// CompressorKind is the compressor implementation to use.
+	CompressorKind flags.CompressorKind
 }
 
 // Check validates the [ChannelConfig] parameters.
@@ -83,14 +95,24 @@ func (cc *ChannelConfig) Check() error {
 		return fmt.Errorf("max frame size %d is less than the minimum 23", cc.MaxFrameSize)
 	}
 
-	// Compressor must be set
-	if cc.CompressorFactory == nil {
-		return errors.New("compressor factory cannot be nil")
-	}
-
 	return nil
 }
 
+func (cc *ChannelConfig) NewCompressor() (derive.Compressor, error) {
+	switch cc.CompressorKind {
+	case flags.CompressorShadow:
+		return NewShadowCompressor(
+			cc.MaxFrameSize, // subtract 1 byte for version
+		)
+	default:
+		return NewTargetSizeCompressor(
+			cc.TargetFrameSize, // subtract 1 byte for version
+			cc.TargetNumFrames,
+			cc.ApproxComprRatio,
+		)
+	}
+}
+
 type frameID struct {
 	chID        derive.ChannelID
 	frameNumber uint16
@@ -131,7 +153,7 @@ type channelBuilder struct {
 // newChannelBuilder creates a new channel builder or returns an error if the
 // channel out could not be created.
 func newChannelBuilder(cfg ChannelConfig) (*channelBuilder, error) {
-	c, err := cfg.CompressorFactory()
+	c, err := cfg.NewCompressor()
 	if err != nil {
 		return nil, err
 	}

op-batcher/batcher/channel_builder_test.go

@@ -28,13 +28,9 @@ var defaultTestChannelConfig = ChannelConfig{
 	MaxChannelDuration: 1,
 	SubSafetyMargin:    4,
 	MaxFrameSize:       120000,
-	CompressorFactory:  newCompressorFactory(100000, 1, 0.4),
-}
-
-func newCompressorFactory(targetFrameSize uint64, targetNumFrames int, approxCompRatio float64) CompressorFactory {
-	return func() (derive.Compressor, error) {
-		return NewTargetSizeCompressor(targetFrameSize, targetNumFrames, approxCompRatio)
-	}
+	TargetFrameSize:    100000,
+	TargetNumFrames:    1,
+	ApproxComprRatio:   0.4,
 }
 
 // TestChannelConfig_Check tests the [ChannelConfig] [Check] function.
@@ -420,7 +416,7 @@ func TestChannelBuilder_OutputWrongFramePanic(t *testing.T) {
 
 	// Mock the internals of `channelBuilder.outputFrame`
 	// to construct a single frame
-	c, err := channelConfig.CompressorFactory()
+	c, err := channelConfig.NewCompressor()
 	require.NoError(t, err)
 	co, err := derive.NewChannelOut(c)
 	require.NoError(t, err)
@@ -488,7 +484,9 @@ func TestChannelBuilder_OutputFramesWorks(t *testing.T) {
 func TestChannelBuilder_MaxRLPBytesPerChannel(t *testing.T) {
 	t.Parallel()
 	channelConfig := defaultTestChannelConfig
-	channelConfig.CompressorFactory = newCompressorFactory(derive.MaxRLPBytesPerChannel*2, derive.MaxRLPBytesPerChannel*2, 1)
+	channelConfig.MaxFrameSize = derive.MaxRLPBytesPerChannel * 2
+	channelConfig.TargetFrameSize = derive.MaxRLPBytesPerChannel * 2
+	channelConfig.ApproxComprRatio = 1
 
 	// Construct the channel builder
 	cb, err := newChannelBuilder(channelConfig)
@@ -504,7 +502,9 @@ func TestChannelBuilder_MaxRLPBytesPerChannel(t *testing.T) {
 func TestChannelBuilder_OutputFramesMaxFrameIndex(t *testing.T) {
 	channelConfig := defaultTestChannelConfig
 	channelConfig.MaxFrameSize = 24
-	channelConfig.CompressorFactory = newCompressorFactory(24, math.MaxInt, 0)
+	channelConfig.TargetNumFrames = math.MaxInt
+	channelConfig.TargetFrameSize = 24
+	channelConfig.ApproxComprRatio = 0
 
 	// Continuously add blocks until the max frame index is reached
 	// This should cause the [channelBuilder.OutputFrames] function
@@ -546,7 +546,9 @@ func TestChannelBuilder_AddBlock(t *testing.T) {
 	channelConfig.MaxFrameSize = 30
 
 	// Configure the Input Threshold params so we observe a full channel
-	channelConfig.CompressorFactory = newCompressorFactory(30, 2, 1)
+	channelConfig.TargetFrameSize = 30
+	channelConfig.TargetNumFrames = 2
+	channelConfig.ApproxComprRatio = 1
 
 	// Construct the channel builder
 	cb, err := newChannelBuilder(channelConfig)
@@ -701,8 +703,10 @@ func TestChannelBuilder_OutputBytes(t *testing.T) {
 	require := require.New(t)
 	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
 	cfg := defaultTestChannelConfig
+	cfg.TargetFrameSize = 1000
 	cfg.MaxFrameSize = 1000
-	cfg.CompressorFactory = newCompressorFactory(1000, 16, 1)
+	cfg.TargetNumFrames = 16
+	cfg.ApproxComprRatio = 1.0
 	cb, err := newChannelBuilder(cfg)
 	require.NoError(err, "newChannelBuilder")
 

op-batcher/batcher/channel_manager_test.go

@@ -98,8 +98,9 @@ func TestChannelManagerReturnsErrReorgWhenDrained(t *testing.T) {
 	log := testlog.Logger(t, log.LvlCrit)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
+			TargetFrameSize:  1,
 			MaxFrameSize:     120_000,
-			CompressorFactory: newCompressorFactory(1, 1, 1),
+			ApproxComprRatio: 1.0,
 		})
 
 	a := newMiniL2Block(0)
@@ -170,7 +171,8 @@ func TestChannelManager_Clear(t *testing.T) {
 		// Have to set the max frame size here otherwise the channel builder would not
 		// be able to output any frames
 		MaxFrameSize:     24,
-		CompressorFactory: newCompressorFactory(24, 1, 1),
+		TargetFrameSize:  24,
+		ApproxComprRatio: 1.0,
 	})
 
 	// Channel Manager state should be empty by default
@@ -329,8 +331,9 @@ func TestChannelManager_TxResend(t *testing.T) {
 	log := testlog.Logger(t, log.LvlError)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
+			TargetFrameSize:  1,
 			MaxFrameSize:     120_000,
-			CompressorFactory: newCompressorFactory(1, 1, 1),
+			ApproxComprRatio: 1.0,
 		})
 
 	a, _ := derivetest.RandomL2Block(rng, 4)
@@ -369,8 +372,9 @@ func TestChannelManagerCloseBeforeFirstUse(t *testing.T) {
 	log := testlog.Logger(t, log.LvlCrit)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
+			TargetFrameSize:  1,
 			MaxFrameSize:     100,
-			CompressorFactory: newCompressorFactory(0, 1, 1),
+			ApproxComprRatio: 1.0,
 			ChannelTimeout:   1000,
 		})
 
@@ -393,8 +397,9 @@ func TestChannelManagerCloseNoPendingChannel(t *testing.T) {
 	log := testlog.Logger(t, log.LvlCrit)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
-			MaxFrameSize:      1000,
-			CompressorFactory: newCompressorFactory(1, 1, 1),
+			TargetFrameSize:  1,
+			MaxFrameSize:     100,
+			ApproxComprRatio: 1.0,
 			ChannelTimeout:   1000,
 		})
 	a := newMiniL2Block(0)
@@ -428,8 +433,10 @@ func TestChannelManagerClosePendingChannel(t *testing.T) {
 	log := testlog.Logger(t, log.LvlCrit)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
+			TargetNumFrames:  100,
+			TargetFrameSize:  1000,
 			MaxFrameSize:     1000,
-			CompressorFactory: newCompressorFactory(1000, 100, 1),
+			ApproxComprRatio: 1.0,
 			ChannelTimeout:   1000,
 		})
 
@@ -469,8 +476,10 @@ func TestChannelManagerCloseAllTxsFailed(t *testing.T) {
 	log := testlog.Logger(t, log.LvlCrit)
 	m := NewChannelManager(log, metrics.NoopMetrics,
 		ChannelConfig{
+			TargetNumFrames:  100,
+			TargetFrameSize:  1000,
 			MaxFrameSize:     1000,
-			CompressorFactory: newCompressorFactory(1000, 100, 1),
+			ApproxComprRatio: 1.0,
 			ChannelTimeout:   1000,
 		})
 

op-batcher/batcher/config.go

@@ -12,7 +12,6 @@ import (
 	"github.com/ethereum-optimism/optimism/op-batcher/metrics"
 	"github.com/ethereum-optimism/optimism/op-batcher/rpc"
 	"github.com/ethereum-optimism/optimism/op-node/rollup"
-	"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
 	"github.com/ethereum-optimism/optimism/op-node/sources"
 	oplog "github.com/ethereum-optimism/optimism/op-service/log"
 	opmetrics "github.com/ethereum-optimism/optimism/op-service/metrics"
@@ -153,20 +152,3 @@ func NewConfig(ctx *cli.Context) CLIConfig {
 		PprofConfig:            oppprof.ReadCLIConfig(ctx),
 	}
 }
-
-func (c CLIConfig) NewCompressorFactory() CompressorFactory {
-	return func() (derive.Compressor, error) {
-		switch c.CompressorKind {
-		case flags.CompressorTarget:
-			return NewTargetSizeCompressor(
-				c.TargetL1TxSize-1, // subtract 1 byte for version
-				c.TargetNumFrames,
-				c.ApproxComprRatio,
-			)
-		default:
-			return NewShadowCompressor(
-				c.MaxL1TxSize - 1, // subtract 1 byte for version
-			)
-		}
-	}
-}

op-batcher/batcher/driver.go

@@ -90,7 +90,10 @@ func NewBatchSubmitterFromCLIConfig(cfg CLIConfig, l log.Logger, m metrics.Metri
 			MaxChannelDuration: cfg.MaxChannelDuration,
 			SubSafetyMargin:    cfg.SubSafetyMargin,
 			MaxFrameSize:       cfg.MaxL1TxSize - 1,    // subtract 1 byte for version
-			CompressorFactory:  cfg.NewCompressorFactory(),
+			TargetFrameSize:    cfg.TargetL1TxSize - 1, // subtract 1 byte for version
+			TargetNumFrames:    cfg.TargetNumFrames,
+			ApproxComprRatio:   cfg.ApproxComprRatio,
+			CompressorKind:     cfg.CompressorKind,
 		},
 	}
 

op-batcher/batcher/target_size_compressor_test.go

 package batcher_test
 
 import (
+	"github.com/ethereum-optimism/optimism/op-batcher/flags"
 	"math"
 	"testing"
 
@@ -118,13 +119,15 @@ func TestInputThreshold(t *testing.T) {
 
 	// Validate each test case
 	for _, tt := range tests {
-		compressor, err := batcher.NewTargetSizeCompressor(
-			tt.input.TargetFrameSize,
-			tt.input.TargetNumFrames,
-			tt.input.ApproxComprRatio,
-		)
+		config := batcher.ChannelConfig{
+			TargetFrameSize:  tt.input.TargetFrameSize,
+			TargetNumFrames:  tt.input.TargetNumFrames,
+			ApproxComprRatio: tt.input.ApproxComprRatio,
+			CompressorKind:   flags.CompressorTarget,
+		}
+		comp, err := config.NewCompressor()
 		require.NoError(t, err)
-		got := compressor.(*batcher.TargetSizeCompressor).InputThreshold()
+		got := comp.(*batcher.TargetSizeCompressor).InputThreshold()
 		tt.assertion(got)
 	}
 }

op-batcher/flags/flags.go

@@ -92,7 +92,7 @@ var (
 			flags.EnumString[CompressorKind](CompressorKinds),
 		EnvVar: opservice.PrefixEnvVar(envVarPrefix, "COMPRESSOR"),
 		Value: func() *CompressorKind {
-			out := CompressorShadow
+			out := CompressorTarget
 			return &out
 		}(),
 	}