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|
package dynamodb
import (
"encoding/json"
"errors"
"fmt"
simplejson "github.com/bitly/go-simplejson"
)
type Table struct {
Server *Server
Name string
Key PrimaryKey
}
type AttributeDefinitionT struct {
Name string `json:"AttributeName"`
Type string `json:"AttributeType"`
}
type KeySchemaT struct {
AttributeName string
KeyType string
}
type ProjectionT struct {
ProjectionType string
}
type GlobalSecondaryIndexT struct {
IndexName string
IndexSizeBytes int64
ItemCount int64
KeySchema []KeySchemaT
Projection ProjectionT
ProvisionedThroughput ProvisionedThroughputT
}
type LocalSecondaryIndexT struct {
IndexName string
IndexSizeBytes int64
ItemCount int64
KeySchema []KeySchemaT
Projection ProjectionT
}
type ProvisionedThroughputT struct {
NumberOfDecreasesToday int64
ReadCapacityUnits int64
WriteCapacityUnits int64
}
type StreamSpecificationT struct {
StreamEnabled bool
StreamViewType string
}
type TableDescriptionT struct {
AttributeDefinitions []AttributeDefinitionT
CreationDateTime float64
ItemCount int64
KeySchema []KeySchemaT
GlobalSecondaryIndexes []GlobalSecondaryIndexT
LocalSecondaryIndexes []LocalSecondaryIndexT
ProvisionedThroughput ProvisionedThroughputT
StreamSpecification StreamSpecificationT
TableName string
TableSizeBytes int64
TableStatus string
LatestStreamArn string
LatestStreamLabel string
}
type describeTableResponse struct {
Table TableDescriptionT
}
func findAttributeDefinitionByName(ads []AttributeDefinitionT, name string) *AttributeDefinitionT {
for _, a := range ads {
if a.Name == name {
return &a
}
}
return nil
}
func (a *AttributeDefinitionT) GetEmptyAttribute() *Attribute {
switch a.Type {
case "S":
return NewStringAttribute(a.Name, "")
case "N":
return NewNumericAttribute(a.Name, "")
case "B":
return NewBinaryAttribute(a.Name, "")
default:
return nil
}
}
func (t *TableDescriptionT) BuildPrimaryKey() (pk PrimaryKey, err error) {
for _, k := range t.KeySchema {
var attr *Attribute
ad := findAttributeDefinitionByName(t.AttributeDefinitions, k.AttributeName)
if ad == nil {
return pk, errors.New("An inconsistency found in TableDescriptionT")
}
attr = ad.GetEmptyAttribute()
if attr == nil {
return pk, errors.New("An inconsistency found in TableDescriptionT")
}
switch k.KeyType {
case "HASH":
pk.KeyAttribute = attr
case "RANGE":
pk.RangeAttribute = attr
}
}
return
}
func (s *Server) NewTable(name string, key PrimaryKey) *Table {
return &Table{s, name, key}
}
func (s *Server) ListTables() ([]string, error) {
var tables []string
query := NewEmptyQuery()
jsonResponse, err := s.queryServer(target("ListTables"), query)
if err != nil {
return nil, err
}
json, err := simplejson.NewJson(jsonResponse)
if err != nil {
return nil, err
}
response, err := json.Get("TableNames").Array()
if err != nil {
message := fmt.Sprintf("Unexpected response %s", jsonResponse)
return nil, errors.New(message)
}
for _, value := range response {
if t, ok := (value).(string); ok {
tables = append(tables, t)
}
}
return tables, nil
}
func (s *Server) CreateTable(tableDescription TableDescriptionT) (string, error) {
query := NewEmptyQuery()
query.AddCreateRequestTable(tableDescription)
jsonResponse, err := s.queryServer(target("CreateTable"), query)
if err != nil {
return "unknown", err
}
json, err := simplejson.NewJson(jsonResponse)
if err != nil {
return "unknown", err
}
return json.Get("TableDescription").Get("TableStatus").MustString(), nil
}
func (s *Server) DeleteTable(tableDescription TableDescriptionT) (string, error) {
query := NewEmptyQuery()
query.AddDeleteRequestTable(tableDescription)
jsonResponse, err := s.queryServer(target("DeleteTable"), query)
if err != nil {
return "unknown", err
}
json, err := simplejson.NewJson(jsonResponse)
if err != nil {
return "unknown", err
}
return json.Get("TableDescription").Get("TableStatus").MustString(), nil
}
func (t *Table) DescribeTable() (*TableDescriptionT, error) {
return t.Server.DescribeTable(t.Name)
}
func (s *Server) DescribeTable(name string) (*TableDescriptionT, error) {
q := NewEmptyQuery()
q.addTableByName(name)
jsonResponse, err := s.queryServer(target("DescribeTable"), q)
if err != nil {
return nil, err
}
var r describeTableResponse
err = json.Unmarshal(jsonResponse, &r)
if err != nil {
return nil, err
}
return &r.Table, nil
}
func (s *Server) UpdateTable(tableDescription TableDescriptionT) (string, error) {
query := NewEmptyQuery()
query.AddUpdateRequestTable(tableDescription)
jsonResponse, err := s.queryServer(target("UpdateTable"), query)
if err != nil {
return "unknown", err
}
json, err := simplejson.NewJson(jsonResponse)
if err != nil {
return "unknown", err
}
return json.Get("TableDescription").Get("TableStatus").MustString(), nil
}
func (t *Table) ListStreams(startArn string) ([]StreamListItemT, error) {
return t.Server.ListTableStreams(t.Name, startArn)
}
func (t *Table) LimitedListStreams(startArn string, limit int64) ([]StreamListItemT, error) {
return t.Server.LimitedListTableStreams(t.Name, startArn, limit)
}
func keyParam(k *PrimaryKey, hashKey string, rangeKey string) string {
value := fmt.Sprintf("{\"HashKeyElement\":{%s}", keyValue(k.KeyAttribute.Type, hashKey))
if k.RangeAttribute != nil {
value = fmt.Sprintf("%s,\"RangeKeyElement\":{%s}", value,
keyValue(k.RangeAttribute.Type, rangeKey))
}
return fmt.Sprintf("\"Key\":%s}", value)
}
func keyValue(key string, value string) string {
return fmt.Sprintf("\"%s\":\"%s\"", key, value)
}
|
