Use jsoniteer for faster json encoding/decoding

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

images/image.go

@@ -2,7 +2,6 @@ package images
 
 import (
 	"context"
-	"encoding/json"
 	"strings"
 	"time"
 
@@ -10,6 +9,7 @@ import (
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/platforms"
+	jsoniter "github.com/json-iterator/go"
 	digest "github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -123,6 +123,7 @@ func Manifest(ctx context.Context, provider content.Provider, image ocispec.Desc
 			return ocispec.Manifest{}, err
 		}
 	}
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 
 	if err := Walk(ctx, HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
 		switch desc.MediaType {
@@ -216,6 +217,7 @@ func Config(ctx context.Context, provider content.Provider, image ocispec.Descri
 // Platforms returns one or more platforms supported by the image.
 func Platforms(ctx context.Context, provider content.Provider, image ocispec.Descriptor) ([]ocispec.Platform, error) {
 	var platformSpecs []ocispec.Platform
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	return platformSpecs, Walk(ctx, Handlers(HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
 		if desc.Platform != nil {
 			platformSpecs = append(platformSpecs, *desc.Platform)
@@ -286,6 +288,7 @@ func Check(ctx context.Context, provider content.Provider, image ocispec.Descrip
 
 // Children returns the immediate children of content described by the descriptor.
 func Children(ctx context.Context, provider content.Provider, desc ocispec.Descriptor, platform string) ([]ocispec.Descriptor, error) {
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	var descs []ocispec.Descriptor
 	switch desc.MediaType {
 	case MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
@@ -354,6 +357,7 @@ func RootFS(ctx context.Context, provider content.Provider, configDesc ocispec.D
 		return nil, err
 	}
 
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	var config ocispec.Image
 	if err := json.Unmarshal(p, &config); err != nil {
 		return nil, err

images/oci/exporter.go

@@ -3,13 +3,13 @@ package oci
 import (
 	"archive/tar"
 	"context"
-	"encoding/json"
 	"io"
 	"sort"
 
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/images"
 	"github.com/containerd/containerd/platforms"
+	jsoniter "github.com/json-iterator/go"
 	ocispecs "github.com/opencontainers/image-spec/specs-go"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -116,6 +116,8 @@ func ociLayoutFile(version string) tarRecord {
 		Version: version,
 	}
 
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
+
 	b, err := json.Marshal(layout)
 	if err != nil {
 		panic(err)
@@ -144,6 +146,7 @@ func ociIndexRecord(manifests ...ocispec.Descriptor) tarRecord {
 		Manifests: manifests,
 	}
 
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	b, err := json.Marshal(index)
 	if err != nil {
 		panic(err)

images/oci/importer.go

@@ -4,7 +4,6 @@ package oci
 import (
 	"archive/tar"
 	"context"
-	"encoding/json"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -14,6 +13,7 @@ import (
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/images"
+	jsoniter "github.com/json-iterator/go"
 	digest "github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -83,6 +83,7 @@ func onUntarIndexJSON(r io.Reader, imageName string) ([]images.Image, error) {
 	if err != nil {
 		return nil, err
 	}
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	var idx ocispec.Index
 	if err := json.Unmarshal(b, &idx); err != nil {
 		return nil, err
@@ -131,6 +132,7 @@ func onUntarBlob(ctx context.Context, r io.Reader, store content.Store, name str
 // - images.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest
 // - images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex
 func GetChildrenDescriptors(r io.Reader, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
+	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	switch desc.MediaType {
 	case images.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
 		var manifest ocispec.Manifest