fix(pubsublite): rename publish.Metadata to pscompat.MessageMetadata (#3672)

Since publish.Metadata now also applies to message ids, it was renamed to MessageMetadata and duplicated in the internal/wire and pscompat packages.
diff --git a/pubsublite/go.sum b/pubsublite/go.sum
index 7ed2d7b..bfe4f90 100644
--- a/pubsublite/go.sum
+++ b/pubsublite/go.sum
@@ -13,7 +13,6 @@
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@@ -24,8 +23,10 @@
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@@ -37,28 +38,44 @@
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@@ -70,6 +87,7 @@
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@@ -83,11 +101,11 @@
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 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
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 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
-go.opencensus.io v0.22.4 h1:LYy1Hy3MJdrCdMwwzxA/dRok4ejH+RwNGbuoD9fCjto=
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@@ -155,6 +186,7 @@
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@@ -165,8 +197,10 @@
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@@ -177,20 +211,18 @@
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@@ -220,9 +252,7 @@
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@@ -233,11 +263,8 @@
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@@ -249,7 +276,6 @@
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@@ -278,30 +304,27 @@
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+golang.org/x/time v0.0.0-20201208040808-7e3f01d25324 h1:Hir2P/De0WpUhtrKGGjvSb2YxUgyZ7EFOSLIcSSpiwE=
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@@ -347,7 +370,6 @@
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 golang.org/x/tools v0.0.0-20201201161351-ac6f37ff4c2a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201202200335-bef1c476418a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.0.0-20201208233053-a543418bbed2 h1:vEtypaVub6UvKkiXZ2xx9QIvp9TL7sI7xp7vdi2kezA=
 golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210108195828-e2f9c7f1fc8e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
@@ -374,9 +396,7 @@
 google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
 google.golang.org/api v0.29.0/go.mod h1:Lcubydp8VUV7KeIHD9z2Bys/sm/vGKnG1UHuDBSrHWM=
 google.golang.org/api v0.30.0/go.mod h1:QGmEvQ87FHZNiUVJkT14jQNYJ4ZJjdRF23ZXz5138Fc=
-google.golang.org/api v0.35.0 h1:TBCmTTxUrRDA1iTctnK/fIeitxIZ+TQuaf0j29fmCGo=
 google.golang.org/api v0.35.0/go.mod h1:/XrVsuzM0rZmrsbjJutiuftIzeuTQcEeaYcSk/mQ1dg=
-google.golang.org/api v0.36.0 h1:l2Nfbl2GPXdWorv+dT2XfinX2jOOw4zv1VhLstx+6rE=
 google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34qYtE=
 google.golang.org/api v0.39.0 h1:zHCTXf0NeDdKTgcSQpT+ZflWAqHsEp1GmdpxW09f3YM=
 google.golang.org/api v0.39.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
@@ -385,7 +405,6 @@
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
-google.golang.org/appengine v1.6.6 h1:lMO5rYAqUxkmaj76jAkRUvt5JZgFymx/+Q5Mzfivuhc=
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
 google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
@@ -442,7 +461,6 @@
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.34.0 h1:raiipEjMOIC/TO2AvyTxP25XFdLxNIBwzDh3FM3XztI=
 google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
 google.golang.org/grpc v1.35.0 h1:TwIQcH3es+MojMVojxxfQ3l3OF2KzlRxML2xZq0kRo8=
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
@@ -458,8 +476,11 @@
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0 h1:0vLT13EuvQ0hNvakwLuFZ/jYrLp5F3kcWHXdRggjCE8=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -467,7 +488,11 @@
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0 h1:HfqmD5MEmC0zvwBuF187nq9mdnXjXsSivRiXN7SmRkE=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/pubsublite/internal/wire/publish_batcher.go b/pubsublite/internal/wire/publish_batcher.go
index 1fa8ed1..63999b1 100644
--- a/pubsublite/internal/wire/publish_batcher.go
+++ b/pubsublite/internal/wire/publish_batcher.go
@@ -18,7 +18,6 @@
 	"errors"
 	"fmt"
 
-	"cloud.google.com/go/pubsublite/publish"
 	"golang.org/x/xerrors"
 	"google.golang.org/api/support/bundler"
 	"google.golang.org/protobuf/proto"
@@ -29,7 +28,7 @@
 var errPublishQueueEmpty = errors.New("pubsublite: received publish response from server with no batches in flight")
 
 // PublishResultFunc receives the result of a publish.
-type PublishResultFunc func(*publish.Metadata, error)
+type PublishResultFunc func(*MessageMetadata, error)
 
 // messageHolder stores a message to be published, with associated metadata.
 type messageHolder struct {
@@ -142,8 +141,8 @@
 	batch, _ := frontElem.Value.(*publishBatch)
 	for i, msgHolder := range batch.msgHolders {
 		// Messages are ordered, so the offset of each message is firstOffset + i.
-		pm := &publish.Metadata{Partition: b.partition, Offset: firstOffset + int64(i)}
-		msgHolder.onResult(pm, nil)
+		mm := &MessageMetadata{Partition: b.partition, Offset: firstOffset + int64(i)}
+		msgHolder.onResult(mm, nil)
 		b.availableBufferBytes += msgHolder.size
 	}
 
diff --git a/pubsublite/internal/wire/publish_batcher_test.go b/pubsublite/internal/wire/publish_batcher_test.go
index 29b4dfc..690c7ed 100644
--- a/pubsublite/internal/wire/publish_batcher_test.go
+++ b/pubsublite/internal/wire/publish_batcher_test.go
@@ -20,7 +20,6 @@
 
 	"cloud.google.com/go/internal/testutil"
 	"cloud.google.com/go/pubsublite/internal/test"
-	"cloud.google.com/go/pubsublite/publish"
 	"github.com/google/go-cmp/cmp"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
@@ -35,7 +34,7 @@
 	done   chan struct{}
 	msg    string
 	t      *testing.T
-	got    *publish.Metadata
+	got    *MessageMetadata
 	gotErr error
 }
 
@@ -47,8 +46,8 @@
 	}
 }
 
-func (r *testPublishResultReceiver) set(pm *publish.Metadata, err error) {
-	r.got = pm
+func (r *testPublishResultReceiver) set(mm *MessageMetadata, err error) {
+	r.got = mm
 	r.gotErr = err
 	close(r.done)
 }
diff --git a/pubsublite/internal/wire/resources.go b/pubsublite/internal/wire/resources.go
index 5fa01a7..228d632 100644
--- a/pubsublite/internal/wire/resources.go
+++ b/pubsublite/internal/wire/resources.go
@@ -161,3 +161,20 @@
 func (sp subscriptionPartition) String() string {
 	return fmt.Sprintf("%s/partitions/%d", sp.Path, sp.Partition)
 }
+
+// MessageMetadata holds properties of a message published to the Pub/Sub Lite
+// service.
+//
+// NOTE: This is duplicated in the pscompat package in order to generate nicer
+// docs and should be kept consistent.
+type MessageMetadata struct {
+	// The topic partition the message was published to.
+	Partition int
+
+	// The offset the message was assigned.
+	Offset int64
+}
+
+func (m *MessageMetadata) String() string {
+	return fmt.Sprintf("%d:%d", m.Partition, m.Offset)
+}
diff --git a/pubsublite/pscompat/example_test.go b/pubsublite/pscompat/example_test.go
index af02852..0a97cd5 100644
--- a/pubsublite/pscompat/example_test.go
+++ b/pubsublite/pscompat/example_test.go
@@ -186,3 +186,45 @@
 	// receiving.
 	cancel()
 }
+
+func ExampleParseMessageMetadata_publisher() {
+	ctx := context.Background()
+	const topic = "projects/my-project/locations/zone/topics/my-topic"
+	publisher, err := pscompat.NewPublisherClient(ctx, topic)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer publisher.Stop()
+
+	result := publisher.Publish(ctx, &pubsub.Message{Data: []byte("payload")})
+	id, err := result.Get(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	metadata, err := pscompat.ParseMessageMetadata(id)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	fmt.Printf("Published message to partition %d with offset %d\n", metadata.Partition, metadata.Offset)
+}
+
+func ExampleParseMessageMetadata_subscriber() {
+	ctx := context.Background()
+	const subscription = "projects/my-project/locations/zone/subscriptions/my-subscription"
+	subscriber, err := pscompat.NewSubscriberClient(ctx, subscription)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	err = subscriber.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
+		// TODO: Handle message.
+		m.Ack()
+		metadata, err := pscompat.ParseMessageMetadata(m.ID)
+		if err != nil {
+			// TODO: Handle error.
+		}
+		fmt.Printf("Received message from partition %d with offset %d\n", metadata.Partition, metadata.Offset)
+	})
+	if err != nil {
+		// TODO: Handle error.
+	}
+}
diff --git a/pubsublite/pscompat/integration_test.go b/pubsublite/pscompat/integration_test.go
index 2f539cf..ce2465c 100644
--- a/pubsublite/pscompat/integration_test.go
+++ b/pubsublite/pscompat/integration_test.go
@@ -28,7 +28,6 @@
 	"cloud.google.com/go/pubsublite"
 	"cloud.google.com/go/pubsublite/internal/test"
 	"cloud.google.com/go/pubsublite/internal/wire"
-	"cloud.google.com/go/pubsublite/publish"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"golang.org/x/sync/errgroup"
 	"google.golang.org/api/option"
@@ -207,7 +206,7 @@
 		if err != nil {
 			t.Errorf("Publish(%d) got err: %v", i, err)
 		}
-		if _, err := publish.ParseMetadata(id); err != nil {
+		if _, err := ParseMessageMetadata(id); err != nil {
 			t.Error(err)
 		}
 	}
@@ -242,7 +241,7 @@
 		}
 
 		// Check message ordering.
-		metadata, err := publish.ParseMetadata(msg.ID)
+		metadata, err := ParseMessageMetadata(msg.ID)
 		if err != nil {
 			t.Error(err)
 		} else {
diff --git a/pubsublite/pscompat/message.go b/pubsublite/pscompat/message.go
index 1a6f65d..ef8a936 100644
--- a/pubsublite/pscompat/message.go
+++ b/pubsublite/pscompat/message.go
@@ -17,6 +17,8 @@
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"strconv"
+	"strings"
 
 	"cloud.google.com/go/pubsub"
 	"github.com/golang/protobuf/ptypes"
@@ -128,3 +130,34 @@
 	}
 	return nil
 }
+
+// MessageMetadata holds properties of a message published to the Pub/Sub Lite
+// service.
+type MessageMetadata struct {
+	// The topic partition the message was published to.
+	Partition int
+
+	// The offset the message was assigned.
+	Offset int64
+}
+
+func (m *MessageMetadata) String() string {
+	return fmt.Sprintf("%d:%d", m.Partition, m.Offset)
+}
+
+// ParseMessageMetadata creates MessageMetadata from the ID string of a
+// pubsub.PublishResult returned by PublisherClient or pubsub.Message.ID
+// received from SubscriberClient.
+func ParseMessageMetadata(id string) (*MessageMetadata, error) {
+	parts := strings.Split(id, ":")
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("pubsublite: invalid encoded message metadata %q", id)
+	}
+
+	partition, pErr := strconv.ParseInt(parts[0], 10, 64)
+	offset, oErr := strconv.ParseInt(parts[1], 10, 64)
+	if pErr != nil || oErr != nil {
+		return nil, fmt.Errorf("pubsublite: invalid encoded message metadata %q", id)
+	}
+	return &MessageMetadata{Partition: int(partition), Offset: offset}, nil
+}
diff --git a/pubsublite/pscompat/message_test.go b/pubsublite/pscompat/message_test.go
index e196ee2..54499c1 100644
--- a/pubsublite/pscompat/message_test.go
+++ b/pubsublite/pscompat/message_test.go
@@ -142,3 +142,51 @@
 		})
 	}
 }
+
+func TestMessageMetadataStringEncoding(t *testing.T) {
+	for _, tc := range []struct {
+		desc    string
+		input   string
+		want    *MessageMetadata
+		wantErr bool
+	}{
+		{
+			desc:  "valid: zero",
+			input: "0:0",
+			want:  &MessageMetadata{Partition: 0, Offset: 0},
+		},
+		{
+			desc:  "valid: non-zero",
+			input: "3:1234",
+			want:  &MessageMetadata{Partition: 3, Offset: 1234},
+		},
+		{
+			desc:    "invalid: number",
+			input:   "1234",
+			wantErr: true,
+		},
+		{
+			desc:    "invalid: partition",
+			input:   "p:1234",
+			wantErr: true,
+		},
+		{
+			desc:    "invalid: offset",
+			input:   "10:9offset",
+			wantErr: true,
+		},
+	} {
+		t.Run(tc.desc, func(t *testing.T) {
+			got, gotErr := ParseMessageMetadata(tc.input)
+			if !testutil.Equal(got, tc.want) || (gotErr != nil) != tc.wantErr {
+				t.Errorf("ParseMessageMetadata(%q): got (%v, %v), want (%v, err=%v)", tc.input, got, gotErr, tc.want, tc.wantErr)
+			}
+
+			if tc.want != nil {
+				if got := tc.want.String(); got != tc.input {
+					t.Errorf("MessageMetadata(%v).String(): got %q, want: %q", tc.want, got, tc.input)
+				}
+			}
+		})
+	}
+}
diff --git a/pubsublite/pscompat/publisher.go b/pubsublite/pscompat/publisher.go
index 4527dff..3ffd528 100644
--- a/pubsublite/pscompat/publisher.go
+++ b/pubsublite/pscompat/publisher.go
@@ -19,7 +19,6 @@
 
 	"cloud.google.com/go/pubsub"
 	"cloud.google.com/go/pubsublite/internal/wire"
-	"cloud.google.com/go/pubsublite/publish"
 	"golang.org/x/xerrors"
 	"google.golang.org/api/option"
 	"google.golang.org/api/support/bundler"
@@ -122,10 +121,10 @@
 		return result
 	}
 
-	p.wirePub.Publish(msgpb, func(pm *publish.Metadata, err error) {
+	p.wirePub.Publish(msgpb, func(metadata *wire.MessageMetadata, err error) {
 		err = translateError(err)
-		if pm != nil {
-			ipubsub.SetPublishResult(result, pm.String(), err)
+		if metadata != nil {
+			ipubsub.SetPublishResult(result, metadata.String(), err)
 		} else {
 			ipubsub.SetPublishResult(result, "", err)
 		}
diff --git a/pubsublite/pscompat/publisher_test.go b/pubsublite/pscompat/publisher_test.go
index 88988ff..d794b46 100644
--- a/pubsublite/pscompat/publisher_test.go
+++ b/pubsublite/pscompat/publisher_test.go
@@ -21,7 +21,6 @@
 	"cloud.google.com/go/pubsub"
 	"cloud.google.com/go/pubsublite/internal/test"
 	"cloud.google.com/go/pubsublite/internal/wire"
-	"cloud.google.com/go/pubsublite/publish"
 	"golang.org/x/xerrors"
 	"google.golang.org/api/support/bundler"
 
@@ -44,7 +43,7 @@
 		onResult(nil, err)
 		return
 	}
-	result := resp.(*publish.Metadata)
+	result := resp.(*wire.MessageMetadata)
 	onResult(result, nil)
 }
 
@@ -68,7 +67,7 @@
 		OrderingKey: "ordering_key",
 		Attributes:  map[string]string{"attr": "value"},
 	}
-	fakeResponse := &publish.Metadata{
+	fakeResponse := &wire.MessageMetadata{
 		Partition: 2,
 		Offset:    42,
 	}
diff --git a/pubsublite/pscompat/subscriber.go b/pubsublite/pscompat/subscriber.go
index 709fddc..acfb356 100644
--- a/pubsublite/pscompat/subscriber.go
+++ b/pubsublite/pscompat/subscriber.go
@@ -20,7 +20,6 @@
 
 	"cloud.google.com/go/pubsub"
 	"cloud.google.com/go/pubsublite/internal/wire"
-	"cloud.google.com/go/pubsublite/publish"
 	"google.golang.org/api/option"
 
 	ipubsub "cloud.google.com/go/internal/pubsub"
@@ -136,7 +135,7 @@
 	if len(out.ID) > 0 {
 		return errMessageIDSet
 	}
-	metadata := &publish.Metadata{Partition: in.Partition, Offset: in.Msg.GetCursor().GetOffset()}
+	metadata := &MessageMetadata{Partition: in.Partition, Offset: in.Msg.GetCursor().GetOffset()}
 	out.ID = metadata.String()
 	return nil
 }
diff --git a/pubsublite/publish/example_test.go b/pubsublite/publish/example_test.go
deleted file mode 100644
index 5227083..0000000
--- a/pubsublite/publish/example_test.go
+++ /dev/null
@@ -1,65 +0,0 @@
-// Copyright 2021 Google LLC
-//
-// 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
-//
-//     https://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
-
-package publish_test
-
-import (
-	"context"
-	"fmt"
-
-	"cloud.google.com/go/pubsub"
-	"cloud.google.com/go/pubsublite/pscompat"
-	"cloud.google.com/go/pubsublite/publish"
-)
-
-func ExampleParseMetadata_publisher() {
-	ctx := context.Background()
-	const topic = "projects/my-project/locations/zone/topics/my-topic"
-	publisher, err := pscompat.NewPublisherClient(ctx, topic)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	defer publisher.Stop()
-
-	result := publisher.Publish(ctx, &pubsub.Message{Data: []byte("payload")})
-	id, err := result.Get(ctx)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	metadata, err := publish.ParseMetadata(id)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	fmt.Printf("Published message to partition %d with offset %d\n", metadata.Partition, metadata.Offset)
-}
-
-func ExampleParseMetadata_subscriber() {
-	ctx := context.Background()
-	const subscription = "projects/my-project/locations/zone/subscriptions/my-subscription"
-	subscriber, err := pscompat.NewSubscriberClient(ctx, subscription)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	err = subscriber.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
-		// TODO: Handle message.
-		m.Ack()
-		metadata, err := publish.ParseMetadata(m.ID)
-		if err != nil {
-			// TODO: Handle error.
-		}
-		fmt.Printf("Received message from partition %d with offset %d\n", metadata.Partition, metadata.Offset)
-	})
-	if err != nil {
-		// TODO: Handle error.
-	}
-}
diff --git a/pubsublite/publish/metadata.go b/pubsublite/publish/metadata.go
deleted file mode 100644
index 1db88f6..0000000
--- a/pubsublite/publish/metadata.go
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright 2020 Google LLC
-//
-// 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
-//
-//     https://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
-
-// Package publish contains utilities related to publishing messages.
-package publish
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// Metadata holds the result of publishing a message to the Pub/Sub Lite
-// service.
-type Metadata struct {
-	// The topic partition the message was published to.
-	Partition int
-
-	// The offset the message was assigned.
-	Offset int64
-}
-
-func (m *Metadata) String() string {
-	return fmt.Sprintf("%d:%d", m.Partition, m.Offset)
-}
-
-// ParseMetadata creates Metadata from the ID string of a pubsub.PublishResult
-// returned by pscompat.PublisherClient or pubsub.Message.ID received from
-// pscompat.SubscriberClient.
-func ParseMetadata(id string) (*Metadata, error) {
-	parts := strings.Split(id, ":")
-	if len(parts) != 2 {
-		return nil, fmt.Errorf("pubsublite: invalid encoded publish metadata %q", id)
-	}
-
-	partition, pErr := strconv.ParseInt(parts[0], 10, 64)
-	offset, oErr := strconv.ParseInt(parts[1], 10, 64)
-	if pErr != nil || oErr != nil {
-		return nil, fmt.Errorf("pubsublite: invalid encoded publish metadata %q", id)
-	}
-	return &Metadata{Partition: int(partition), Offset: offset}, nil
-}
diff --git a/pubsublite/publish/metadata_test.go b/pubsublite/publish/metadata_test.go
deleted file mode 100644
index e952993..0000000
--- a/pubsublite/publish/metadata_test.go
+++ /dev/null
@@ -1,68 +0,0 @@
-// Copyright 2020 Google LLC
-//
-// 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
-//
-//     https://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
-
-package publish
-
-import (
-	"testing"
-
-	"cloud.google.com/go/internal/testutil"
-)
-
-func TestPublishMetadataStringEncoding(t *testing.T) {
-	for _, tc := range []struct {
-		desc    string
-		input   string
-		want    *Metadata
-		wantErr bool
-	}{
-		{
-			desc:  "valid: zero",
-			input: "0:0",
-			want:  &Metadata{Partition: 0, Offset: 0},
-		},
-		{
-			desc:  "valid: non-zero",
-			input: "3:1234",
-			want:  &Metadata{Partition: 3, Offset: 1234},
-		},
-		{
-			desc:    "invalid: number",
-			input:   "1234",
-			wantErr: true,
-		},
-		{
-			desc:    "invalid: partition",
-			input:   "p:1234",
-			wantErr: true,
-		},
-		{
-			desc:    "invalid: offset",
-			input:   "10:9offset",
-			wantErr: true,
-		},
-	} {
-		t.Run(tc.desc, func(t *testing.T) {
-			got, gotErr := ParseMetadata(tc.input)
-			if !testutil.Equal(got, tc.want) || (gotErr != nil) != tc.wantErr {
-				t.Errorf("ParseMetadata(%q): got (%v, %v), want (%v, err=%v)", tc.input, got, gotErr, tc.want, tc.wantErr)
-			}
-
-			if tc.want != nil {
-				if got := tc.want.String(); got != tc.input {
-					t.Errorf("Metadata(%v).String(): got %q, want: %q", tc.want, got, tc.input)
-				}
-			}
-		})
-	}
-}