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decode.go
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decode.go
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package tracer
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"testing"
"github.com/stretchr/testify/require"
)
const ReadOperation = "read"
const WriteOperation = "write"
const DeleteOperation = "delete"
type TraceOperation struct {
Operation string `json:"operation"`
Key string `json:"key"`
Value string `json:"value"`
Metadata map[string]interface{} `json:"metadata"`
}
type TraceDecoder struct {
bytes.Buffer
}
func (td *TraceDecoder) GetOperations() (operations []TraceOperation) {
// Trim the string of trailing newlines.
opString := strings.TrimSuffix(td.String(), "\n")
if len(opString) == 0 {
return operations
}
// Split the string on newlines and parse the JSON.
operationStrings := strings.Split(opString, "\n")
for _, operationString := range operationStrings {
var operation = TraceOperation{}
err := json.Unmarshal([]byte(operationString), &operation)
if err != nil {
panic(err)
}
operations = append(operations, operation)
}
return operations
}
func (td *TraceDecoder) GetWriteOperations() (operations []TraceOperation) {
for _, operation := range td.GetOperations() {
if operation.Operation == WriteOperation || operation.Operation == DeleteOperation {
operations = append(operations, operation)
}
}
return operations
}
func (td *TraceDecoder) RequireKeyPrefixWrittenInSequence(
t *testing.T,
keys []string,
) {
writeOperations := td.GetWriteOperations()
decodedWriteOperations := make([]string, 0, len(writeOperations))
for _, operation := range writeOperations {
s, err := base64.StdEncoding.DecodeString(operation.Key)
require.NoError(t, err)
decodedWriteOperations = append(decodedWriteOperations, string(s))
}
require.Len(
t,
decodedWriteOperations,
len(keys),
fmt.Sprintf(
"Different number of write operations (%+v) performed than expected (%+v)",
len(decodedWriteOperations),
len(keys),
),
)
for i, dwo := range decodedWriteOperations {
require.True(
t,
strings.HasPrefix(
dwo,
keys[i],
),
fmt.Sprintf(
"Keys were not written in sequence.\nExpected:\n%s\nFound:\n%s\nWrite index: %d",
keys[i],
dwo,
i,
),
)
}
}
func (td *TraceDecoder) RequireReadWriteInSequence(
t *testing.T,
expectedOperations []TraceOperation,
) {
operations := td.GetOperations()
require.Len(
t,
operations,
len(expectedOperations),
"Different number of operations performed than expected",
)
for i, op := range operations {
require.Equal(t, expectedOperations[i].Operation, op.Operation)
key, err := base64.StdEncoding.DecodeString(op.Key)
require.NoError(t, err)
require.Equal(t, expectedOperations[i].Key, string(key))
value, err := base64.StdEncoding.DecodeString(op.Value)
require.NoError(t, err)
require.Equal(t, expectedOperations[i].Value, string(value))
}
}
// RequireKeyPrefixesWritten checks if the list of key prefixes were
// written to. This should be used when the order of writes do not have
// a deterministic ordering, i.e when state is branched and written back to.
// TODO(CLOB-851) update this function to assert ordering of key prefixes within stores.
func (td *TraceDecoder) RequireKeyPrefixesWritten(
t *testing.T,
keys []string,
) {
writeOperations := td.GetWriteOperations()
decodedWriteOperations := make([]string, 0, len(writeOperations))
for _, operation := range writeOperations {
s, err := base64.StdEncoding.DecodeString(operation.Key)
require.NoError(t, err)
decodedWriteOperations = append(decodedWriteOperations, string(s))
}
for _, key := range keys {
foundMatchingWriteOperation := false
for _, dwo := range decodedWriteOperations {
if strings.HasPrefix(
dwo,
key,
) {
foundMatchingWriteOperation = true
break
}
}
require.Truef(
t,
foundMatchingWriteOperation,
"Did not find a matching write operation for key %+v",
key,
)
}
}