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definition.go
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definition.go
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package tbln
import (
"encoding/hex"
"fmt"
"time"
)
// Definition is common table definition struct.
type Definition struct {
columnNum int
tableName string
algorithm string
Comments []string
names []string
types []string
Extras map[string]Extra
Hashes map[string][]byte
Signs Signatures
}
// NewDefinition is create Definition struct.
func NewDefinition() *Definition {
extras := make(map[string]Extra)
hashes := make(map[string][]byte)
signs := make(Signatures)
return &Definition{
algorithm: ED25519,
Extras: extras,
Hashes: hashes,
Signs: signs,
}
}
// Extra is table definition extra struct.
type Extra struct {
value interface{}
hashTarget bool
}
// NewExtra is return new extra struct.
func NewExtra(value interface{}, hashTarget bool) Extra {
return Extra{
value: value,
hashTarget: hashTarget,
}
}
// Value is return extra value.
func (e *Extra) Value() interface{} {
return e.value
}
// ExtraValue is return extra value.
func (d *Definition) ExtraValue(key string) interface{} {
ext := d.Extras[key]
return ext.Value()
}
// Signature algorithm.
const (
ED25519 = "ED25519"
)
// Signatures is a map of signature name and signature.
type Signatures map[string]Signature
// Signature struct stores a signature, a name, and an algorithm.
type Signature struct {
sign []byte
algorithm string
}
// TableName returns the Table Name.
func (d *Definition) TableName() string {
return d.tableName
}
// SetExtra is set Extra of the Definition.
func (d *Definition) SetExtra(keyName string, value string) {
target := false
if len(value) != 0 {
if len(d.Hashes) > 0 {
target = true
}
d.Extras[keyName] = NewExtra(value, target)
} else {
delete(d.Extras, keyName)
}
}
// SetTableName is set Table Name of the Definition..
func (d *Definition) SetTableName(name string) {
d.tableName = name
d.SetExtra("TableName", name)
}
// Names return column names.
func (d *Definition) Names() []string {
return d.names
}
// SetNames is set Column Name to the Table.
func (d *Definition) SetNames(names []string) error {
if names != nil {
if err := d.setColNum(len(names)); err != nil {
return err
}
}
d.names = names
d.SetExtra("name", JoinRow(names))
return nil
}
// Types return column types.
func (d *Definition) Types() []string {
return d.types
}
// SetTypes is set Column Type to Table.
func (d *Definition) SetTypes(types []string) error {
if types != nil {
if err := d.setColNum(len(types)); err != nil {
return err
}
}
d.types = types
d.SetExtra("type", JoinRow(types))
return nil
}
// ColumnNum returns the number of columns.
func (d *Definition) ColumnNum() int {
return d.columnNum
}
func (d *Definition) setColNum(colNum int) error {
if d.columnNum == 0 {
d.columnNum = colNum
return nil
}
if colNum != d.columnNum {
return fmt.Errorf("number of columns is different")
}
return nil
}
// ToTargetHash is set as target of hash.
func (d *Definition) ToTargetHash(key string, target bool) {
if v, ok := d.Extras[key]; ok {
v.hashTarget = target
d.Extras[key] = v
}
}
// AllTargetHash is set all target of hash.
func (d *Definition) AllTargetHash(target bool) {
for k, v := range d.Extras {
v.hashTarget = target
d.Extras[k] = v
}
}
// SerializeHash returns a []byte that serializes Hash's map.
func (d *Definition) SerializeHash() []byte {
hashes := make([]string, 0, len(d.Hashes))
if val, ok := d.Hashes["sha256"]; ok {
hashes = append(hashes, "sha256:"+fmt.Sprintf("%x", val))
}
if val, ok := d.Hashes["sha512"]; ok {
hashes = append(hashes, "sha512:"+fmt.Sprintf("%x", val))
}
return []byte(JoinRow(hashes))
}
// SetSignatures is set signatures.
func (d *Definition) SetSignatures(sign []string) error {
if len(sign) != 3 {
return fmt.Errorf("not analyze signature")
}
b, err := hex.DecodeString(sign[2])
if err != nil {
return err
}
if sign[1] != ED25519 {
return fmt.Errorf("not support algorithm: %s", sign[1])
}
d.Signs[sign[0]] = Signature{sign: b, algorithm: sign[1]}
return nil
}
// SetHashes is set hashes.
func (d *Definition) SetHashes(hashes []string) error {
if len(hashes) != 2 {
return fmt.Errorf("not analyze hashes")
}
b, err := hex.DecodeString(hashes[1])
if err != nil {
return err
}
d.Hashes[hashes[0]] = b
return nil
}
// PrimaryKey return PrimaryKey
func (d *Definition) PrimaryKey() []string {
return SplitRow(fmt.Sprintf("%s", d.ExtraValue("primarykey")))
}
// GetPKeyPos return PrimaryKey position
func (d *Definition) GetPKeyPos() ([]int, error) {
pk := d.PrimaryKey()
if len(pk) == 0 {
return nil, fmt.Errorf("no primary key")
}
pos := make([]int, 0)
for _, p := range pk {
for n, v := range d.Names() {
if p == v {
pos = append(pos, n)
break
}
}
}
return pos, nil
}
// GetDefinition return Definition
func (d *Definition) GetDefinition() *Definition {
return d
}
// SetTimeStamp is set time stamp.
// If there is no created_at, create it.
// Otherwise updated updated_at.
func (d *Definition) SetTimeStamp() error {
if d.ExtraValue("created_at") == nil {
d.Extras["created_at"] = NewExtra(time.Now().Format(time.RFC3339), false)
return nil
}
d.Extras["updated_at"] = NewExtra(time.Now().Format(time.RFC3339), false)
return nil
}