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codec_test.go
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codec_test.go
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// Copyright [2019] LinkedIn Corp. 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.
package goavro
import (
"bytes"
"fmt"
"os"
"testing"
)
func ExampleCodec_CanonicalSchema() {
schema := `{"type":"map","values":{"type":"enum","name":"foo","symbols":["alpha","bravo"]}}`
codec, err := NewCodec(schema)
if err != nil {
fmt.Println(err)
} else {
fmt.Println(codec.CanonicalSchema())
}
// Output: {"type":"map","values":{"name":"foo","type":"enum","symbols":["alpha","bravo"]}}
}
func TestCodecRabin(t *testing.T) {
cases := []struct {
Schema string
Rabin uint64
}{
{
Schema: `"null"`,
Rabin: 0x63dd24e7cc258f8a,
},
{
Schema: `"boolean"`,
Rabin: 0x9f42fc78a4d4f764,
},
{
Schema: `"int"`,
Rabin: 0x7275d51a3f395c8f,
},
{
Schema: `"long"`,
Rabin: 0xd054e14493f41db7,
},
{
Schema: `"float"`,
Rabin: 0x4d7c02cb3ea8d790,
},
{
Schema: `"double"`,
Rabin: 0x8e7535c032ab957e,
},
{
Schema: `"bytes"`,
Rabin: 0x4fc016dac3201965,
},
{
Schema: `"string"`,
Rabin: 0x8f014872634503c7,
},
{
Schema: `[ "int" ]`,
Rabin: 0xb763638a48b2fb03,
},
{
Schema: `[ "int" , {"type":"boolean"} ]`,
Rabin: 0x4ad63578080c1602,
},
{
Schema: `{"fields":[], "type":"record", "name":"foo"}`,
Rabin: 0xbd0c50c84319be7e,
},
{
Schema: `{"fields":[], "type":"record", "name":"foo", "namespace":"x.y"}`,
Rabin: 0x521d1a6b830ec4ab,
},
{
Schema: `{"fields":[], "type":"record", "name":"a.b.foo", "namespace":"x.y"}`,
Rabin: 0xbfefe5be5021e2b2,
},
{
Schema: `{"fields":[], "type":"record", "name":"foo", "doc":"Useful info"}`,
Rabin: 0xbd0c50c84319be7e,
},
{
Schema: `{"fields":[], "type":"record", "name":"foo", "aliases":["foo","bar"]}`,
Rabin: 0xbd0c50c84319be7e,
},
{
Schema: `{"fields":[], "type":"record", "name":"foo", "doc":"foo", "aliases":["foo","bar"]}`,
Rabin: 0xbd0c50c84319be7e,
},
{
Schema: `{"fields":[{"type":{"type":"boolean"}, "name":"f1"}], "type":"record", "name":"foo"}`,
Rabin: 0x6cd8eaf1c968a33b,
},
{
Schema: `{ "fields":[{"type":"boolean", "aliases":[], "name":"f1", "default":true}, {"order":"descending","name":"f2","doc":"Hello","type":"int"}], "type":"record", "name":"foo"}`,
Rabin: 0xbc8d05bd57f4934a,
},
{
Schema: `{"type":"enum", "name":"foo", "symbols":["A1"]}`,
Rabin: 0xa7fc039e15aa3169,
},
{
Schema: `{"namespace":"x.y.z", "type":"enum", "name":"foo", "doc":"foo bar", "symbols":["A1", "A2"]}`,
Rabin: 0xc2433ae5f4999d8b,
},
{
Schema: `{"name":"foo","type":"fixed","size":15}`,
Rabin: 0x18602ec3ed31a504,
},
{
Schema: `{"namespace":"x.y.z", "type":"fixed", "name":"foo", "doc":"foo bar", "size":32}`,
Rabin: 0xd579d47693a6171e,
},
{
Schema: `{ "items":{"type":"null"}, "type":"array"}`,
Rabin: 0xf7d13f2f68170a6d,
},
{
Schema: `{ "values":"string", "type":"map"}`,
Rabin: 0x86ce965d92864572,
},
{
Schema: `{"name":"PigValue","type":"record", "fields":[{"name":"value", "type":["null", "int", "long", "PigValue"]}]}`,
Rabin: 0xe795dc6656b7e95b,
},
}
for _, c := range cases {
codec, err := NewCodec(c.Schema)
if err != nil {
t.Fatalf("CASE: %s; cannot create code: %s", c.Schema, err)
}
if got, want := codec.Rabin, c.Rabin; got != want {
t.Errorf("CASE: %s; GOT: %#x; WANT: %#x", c.Schema, got, want)
}
}
}
func TestTypeName(t *testing.T) {
cases := []struct {
Schema string
expectedFullName string
expectedNamespace string
}{
{
Schema: `"null"`,
expectedFullName: "null",
expectedNamespace: "",
},
{
Schema: `"boolean"`,
expectedFullName: "boolean",
expectedNamespace: "",
},
{
Schema: `"int"`,
expectedFullName: "int",
expectedNamespace: "",
},
{
Schema: `"long"`,
expectedFullName: "long",
expectedNamespace: "",
},
{
Schema: `"float"`,
expectedFullName: "float",
expectedNamespace: "",
},
{
Schema: `[ "int" ]`,
expectedFullName: "union",
expectedNamespace: "",
},
{
Schema: `[ "int" , {"type":"boolean"} ]`,
expectedFullName: "union",
expectedNamespace: "",
},
{
Schema: `{"fields":[], "type":"record", "name":"foo"}`,
expectedFullName: "foo",
expectedNamespace: "",
},
{
Schema: `{"type":"enum", "name":"foo", "symbols":["A1"]}`,
expectedFullName: "foo",
expectedNamespace: "",
},
{
Schema: `{"name":"foo","type":"fixed","size":15}`,
expectedFullName: "foo",
expectedNamespace: "",
},
{
Schema: `{"fields":[], "type":"record", "name":"foo", "namespace":"x.y"}`,
expectedFullName: "foo",
expectedNamespace: "x.y",
},
{
Schema: `{"namespace":"x.y.z", "type":"enum", "name":"foo", "doc":"foo bar", "symbols":["A1", "A2"]}`,
expectedFullName: "foo",
expectedNamespace: "x.y.z",
},
}
for _, c := range cases {
codec, err := NewCodec(c.Schema)
if err != nil {
t.Fatalf("CASE: %s; cannot create codec: %s", c.Schema, err)
}
typeName := codec.TypeName()
expected, _ := newName(c.expectedFullName, c.expectedNamespace, "")
if typeName != *expected {
t.Errorf("CASE: %s; GOT: %s; WANT: %s", c.Schema, codec.TypeName(), *expected)
}
}
}
func TestSingleObjectEncoding(t *testing.T) {
t.Run("int", func(*testing.T) {
schema := `"int"`
codec, err := NewCodec(schema)
if err != nil {
t.Fatalf("cannot create code: %s", err)
}
t.Run("encoding", func(t *testing.T) {
t.Run("does not modify source buf when cannot encode", func(t *testing.T) {
buf := []byte{0xDE, 0xAD, 0xBE, 0xEF}
buf, err = codec.SingleFromNative(buf, "strings cannot be encoded as int")
ensureError(t, err, "cannot encode binary int")
if got, want := buf, []byte("\xDE\xAD\xBE\xEF"); !bytes.Equal(got, want) {
t.Errorf("GOT: %v; WANT: %v", got, want)
}
})
t.Run("appends header then encoded data", func(t *testing.T) {
const original = "\x01\x02\x03\x04"
buf := []byte(original)
buf, err = codec.SingleFromNative(buf, 3)
ensureError(t, err)
fp := "\xC3\x01" + "\x8F\x5C\x39\x3F\x1A\xD5\x75\x72"
if got, want := buf, []byte(original+fp+"\x06"); !bytes.Equal(got, want) {
t.Errorf("\nGOT:\n\t%v;\nWANT:\n\t%v", got, want)
}
})
})
t.Run("decoding", func(t *testing.T) {
buf, err := codec.SingleFromNative(nil, 3)
ensureError(t, err)
buf = append(buf, "\xDE\xAD"...) // append some junk
datum, newBuf, err := codec.NativeFromSingle(buf)
ensureError(t, err)
if got, want := datum, int32(3); got != want {
t.Errorf("GOT: %v; WANT: %v", got, want)
}
// ensure junk is not disturbed
if got, want := newBuf, []byte("\xDE\xAD"); !bytes.Equal(got, want) {
t.Errorf("\nGOT:\n\t%q;\nWANT:\n\t%q", got, want)
}
})
})
t.Run("record round trip", func(t *testing.T) {
codec, err := NewCodec(`
{
"type": "record",
"name": "LongList",
"fields" : [
{"name": "next", "type": ["null", "LongList"], "default": null}
]
}
`)
ensureError(t, err)
// NOTE: May omit fields when using default value
initial := `{"next":{"LongList":{}}}`
// NOTE: Textual encoding will show all fields, even those with values that
// match their default values
final := `{"next":{"LongList":{"next":null}}}`
// Convert textual Avro data (in Avro JSON format) to native Go form
datum, _, err := codec.NativeFromTextual([]byte(initial))
ensureError(t, err)
// Convert native Go form to single-object encoding form
buf, err := codec.SingleFromNative(nil, datum)
ensureError(t, err)
// Convert single-object encoding form back to native Go form
datum, _, err = codec.NativeFromSingle(buf)
ensureError(t, err)
// Convert native Go form to textual Avro data
buf, err = codec.TextualFromNative(nil, datum)
ensureError(t, err)
if got, want := string(buf), final; got != want {
t.Fatalf("GOT: %v; WANT: %v", got, want)
}
})
}
func ExampleCodec_SingleFromNative() {
codec, err := NewCodec(`"int"`)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
buf, err := codec.SingleFromNative(nil, 3)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
fmt.Println(buf)
// Output: [195 1 143 92 57 63 26 213 117 114 6]
}
func ExampleCodec_NativeFromBinary_singleItemDecoding() {
codec1, err := NewCodec(`"int"`)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
// Create a map of fingerprint values to corresponding Codec instances.
codex := make(map[uint64]*Codec)
codex[codec1.Rabin] = codec1
// Later on when you want to decode such a slice of bytes as a Single-Object
// Encoding, obtain the Rabin fingerprint of the schema used to encode the
// data.
buf := []byte{195, 1, 143, 92, 57, 63, 26, 213, 117, 114, 6}
fingerprint, newBuf, err := FingerprintFromSOE(buf)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
// Get a previously stored Codec from the codex map.
codec2, ok := codex[fingerprint]
if !ok {
fmt.Fprintf(os.Stderr, "unknown codec: %d\n", fingerprint)
return
}
// Use the fetched Codec to decode the buffer as a SOE.
datum, _, err := codec2.NativeFromBinary(newBuf)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
return
}
fmt.Println(datum)
// Output: 3
}
func Test_buildCodecForTypeDescribedByString_CacheRespectsPrecisionScale(t *testing.T) {
schemaMap := map[string]interface{}{
"type": "bytes",
"logicalType": "decimal",
"precision": float64(4),
"scale": float64(2),
}
cachedCodecIdentifier := "preexisting-cached-coded"
cache := map[string]*Codec{
"bytes.decimal": nil, // precision.scale-agnostic codec
"bytes.decimal.4.2": {
schemaOriginal: cachedCodecIdentifier, // using field as identifier
},
}
// cached bytes.decimal codec with matching precision.scale is returned
cacheHit, err := buildCodecForTypeDescribedByString(cache, "", "bytes", schemaMap, nil)
ensureError(t, err) // ensure NO error
if cacheHit.schemaOriginal != cachedCodecIdentifier {
t.Errorf("GOT: %v; WANT: %v", cacheHit.schemaOriginal, cachedCodecIdentifier)
}
// cached codec with unmatching precision.scale is not returned
schemaMap["scale"] = float64(1)
cacheMiss, err := buildCodecForTypeDescribedByString(cache, "", "bytes", schemaMap, nil)
ensureError(t, err) // ensure NO error
if cacheMiss.schemaOriginal == cachedCodecIdentifier {
t.Errorf("GOT: %v; WANT: %v", cacheMiss.schemaOriginal, "!= "+cachedCodecIdentifier)
}
}