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cassandra.go
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cassandra.go
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package cassandra
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"strings"
"sync"
"github.com/gocql/gocql"
"github.com/subiz/header"
"google.golang.org/protobuf/proto"
)
func (me *Query) Connect(seeds []string, keyspace string) error {
me.keyspace = keyspace
me.table = new(sync.Map)
session := header.ConnectDB(seeds, keyspace)
if err := me.loadTables(session, keyspace); err != nil {
return err
}
me.Session = session
return nil
}
type Query struct {
keyspace string
Session *gocql.Session
table *sync.Map
}
func (s *Query) loadTables(ss *gocql.Session, keyspace string) error {
iter := ss.Query(`SELECT table_name, column_name FROM system_schema.columns WHERE keyspace_name=?`, keyspace).Iter()
var tbl, col string
km := make(map[string][]string)
for iter.Scan(&tbl, &col) {
km[tbl] = append(km[tbl], string(col))
}
if err := iter.Close(); err != nil {
return err
}
for tbl, cols := range km {
s.table.Store(tbl, cols)
}
return nil
}
func (s *Query) Upsert(table string, p interface{}) error {
columns := make([]string, 0)
phs := make([]string, 0) // place holders
data := make([]interface{}, 0)
var valueOf reflect.Value
var typeOf reflect.Type
if reflect.TypeOf(p).Kind() == reflect.Ptr {
valueOf, typeOf = reflect.ValueOf(p).Elem(), reflect.TypeOf(p).Elem()
} else {
valueOf, typeOf = reflect.ValueOf(p), reflect.TypeOf(p)
}
for i := 0; i < valueOf.NumField(); i++ {
vf := valueOf.Field(i)
tf := typeOf.Field(i)
jsonname := strings.Split(tf.Tag.Get("json"), ",")[0]
if jsonname == "-" {
continue
}
// only consider field which defined in table
if tbfields, ok := s.table.Load(table); ok {
if !header.ContainString(tbfields.([]string), "\""+jsonname+"\"") && !header.ContainString(tbfields.([]string), jsonname) {
continue
}
}
if isReservedKeyword(jsonname) {
jsonname = "\"" + jsonname + "\""
}
if reflect.DeepEqual(vf.Interface(), reflect.Zero(vf.Type()).Interface()) {
continue
}
columns = append(columns, jsonname)
phs = append(phs, "?")
if vf.Type().Kind() == reflect.Slice && vf.Type().Elem().Kind() == reflect.Ptr {
bs := make([][]byte, 0, vf.Len())
for i := 0; i < vf.Len(); i++ {
b, err := proto.Marshal(vf.Index(i).Interface().(proto.Message))
if err != nil {
return err
}
bs = append(bs, b)
}
data = append(data, bs)
} else if vf.Type().Kind() == reflect.Ptr && vf.Type().Elem().Kind() == reflect.Struct {
b, err := proto.Marshal(vf.Interface().(proto.Message))
if err != nil {
return err
}
data = append(data, b)
} else {
data = append(data, vf.Interface())
}
}
querystring := fmt.Sprintf("INSERT INTO %s(%s) VALUES (%s)", table, strings.Join(columns, ","), strings.Join(phs, ","))
return s.Session.Query(querystring, data...).Exec()
}
var keywords = []string{"ALL", "ALLOW", "ALTER", "AND", "ANY", "APPLY", "AS", "ASC", "ASCII", "AUTHORIZE", "BATCH", "BEGIN", "BIGINT", "BLOB", "BOOLEAN", "BY", "CLUSTERING", "COLUMNFAMILY", "COMPACT", "CONSISTENCY", "COUNT", "COUNTER", "CREATE", "CUSTOM", "DECIMAL", "DELETE", "DESC", "DISTINCT", "DOUBLE", "DROP", "EACH", "EXISTS", "FILTERING", "FLOAT", "FROM", "FROZEN", "FULL", "GRANT", "IF", "IN", "INDEX", "INET", "INFINITY", "INSERT", "INT", "INTO", "KEY", "KEYSPACE", "KEYSPACES", "LEVEL", "LIMIT", "LIST", "LOCAL", "LOCAL", "MAP", "MODIFY", "NAN", "NORECURSIVE", "NOSUPERUSER", "NOT", "OF", "ON", "ONE", "ORDER", "PASSWORD", "PERMISSION", "PERMISSIONS", "PRIMARY", "QUORUM", "RENAME", "REVOKE", "SCHEMA", "SELECT", "SET", "STATIC", "STORAGE", "SUPERUSER", "TABLE", "TEXT", "TIMESTAMP", "TIMEUUID", "THREE", "TO", "TOKEN", "TRUNCATE", "TTL", "TUPLE", "TWO", "UNLOGGED", "UPDATE", "USE", "USER", "USERS", "USING", "UUID", "VALUES", "VARCHAR", "VARINT", "WHERE", "WITH", "WRITETIME", "VIEW"}
func isReservedKeyword(key string) bool {
return header.ContainString(keywords, strings.ToUpper(key))
}
func (s *Query) buildQuery(query interface{}) (string, []interface{}, error) {
var m map[string]interface{}
b, err := json.Marshal(query)
if err != nil {
return "", nil, err
}
if err := json.Unmarshal(b, &m); err != nil {
return "", nil, err
}
q := make([]string, 0, len(m)) // query
qp := make([]interface{}, 0, len(m)) // query parameter
for k, v := range m {
nk := k
if isReservedKeyword(k) {
nk = "\"" + k + "\""
}
q = append(q, nk+"=?")
switch vwt := v.(type) {
case float64:
v = int64(vwt)
}
qp = append(qp, v)
}
qs := strings.Join(q, " AND ")
if qs == "" {
return "", nil, nil
}
return " WHERE " + qs, qp, nil
}
func (s *Query) Read(table string, p interface{}, query interface{}) error {
valueOf := reflect.New(reflect.SliceOf(reflect.TypeOf(p))).Elem()
cols, findicies := s.analysisType(table, valueOf)
qs, qp, err := s.buildQuery(query)
querystring := fmt.Sprintf("SELECT %s FROM %s %s LIMIT 1", cols, table, qs)
err = s.alloc(valueOf, findicies, querystring, qp)
if err != nil {
return err
}
if valueOf.Len() == 0 {
return gocql.ErrNotFound
}
reflect.ValueOf(p).Elem().Set(valueOf.Index(0).Elem())
return nil
}
func (s *Query) buildMapQuery(query map[string]interface{}) (string, []interface{}) {
q := make([]string, 0, len(query)) // query
qp := make([]interface{}, 0, len(query)) // query parameter
for k, v := range query {
q, qp = append(q, k+"?"), append(qp, v)
}
qs := strings.Join(q, " AND ")
if qs == "" {
return "", nil
}
return " WHERE " + qs, qp
}
// p is pointer to array of pointer
func (s *Query) analysisType(table string, p reflect.Value) (cols string, findices []int) {
columns := make([]string, 0)
eleTypeOf := p.Type().Elem().Elem()
validC := make([]int, 0)
for i := 0; i < eleTypeOf.NumField(); i++ {
tf := eleTypeOf.Field(i)
jsonname := strings.Split(tf.Tag.Get("json"), ",")[0]
if jsonname == "-" {
continue
}
// only consider column which is defined in table
if tbfields, ok := s.table.Load(table); ok {
if !header.ContainString(tbfields.([]string), "\""+jsonname+"\"") && !header.ContainString(tbfields.([]string), jsonname) {
continue
}
}
if isReservedKeyword(jsonname) {
jsonname = "\"" + jsonname + "\""
}
validC = append(validC, i)
columns = append(columns, jsonname)
}
return strings.Join(columns, ","), validC
}
func (s *Query) List(table string, p interface{}, query map[string]interface{}, limit int) error {
if reflect.TypeOf(p).Kind() != reflect.Ptr {
return errors.New("cassandra reflect error: p must be a pointer to array")
}
valueOf := reflect.ValueOf(p).Elem() // a slice
if limit == 0 {
limit = 20
} else if limit < 0 {
limit = -limit
}
if limit > 1000 {
limit = 1000
}
orderby := ""
if query["order by"] != nil {
orderby = "ORDER BY " + query["order by"].(string)
delete(query, "order by")
}
cols, findicies := s.analysisType(table, valueOf)
qs, qp := s.buildMapQuery(query)
querystring := fmt.Sprintf("SELECT %s FROM %s %s %s LIMIT %v", cols, table, qs, orderby, limit)
return s.alloc(valueOf, findicies, querystring, qp)
}
func (s *Query) buildBatchQuery(query map[string]interface{}) (string, []interface{}) {
q := make([]string, 0) // query
qp := make([]interface{}, 0)
for k, v := range query {
if reflect.Slice == reflect.TypeOf(v).Kind() {
s := reflect.ValueOf(v)
if s.Len() == 0 {
continue
}
ph := make([]string, 0, s.Len())
for i := 0; i < s.Len(); i++ {
ph = append(ph, "?")
qp = append(qp, s.Index(i).Interface())
}
phs := " (" + strings.Join(ph, ",") + ")"
q = append(q, k+phs)
} else {
q = append(q, k+"?")
qp = append(qp, v)
}
}
qs := strings.Join(q, " AND ")
if qs == "" {
return "", nil
}
return " WHERE " + qs, qp
}
func (s *Query) alloc(v reflect.Value, findicies []int, querystring string, qp []interface{}) error {
val := v //reflect.MakeSlice(v.Type(), 0, 1)
iter := s.Session.Query(querystring, qp...).Iter()
ps := reflect.MakeSlice(val.Type(), 1, 1)
t := val.Type().Elem().Elem()
for {
pnewele := reflect.New(t)
data := make([]interface{}, 0, len(findicies))
sfis := make(map[int]*[]byte)
sfises := make(map[int]*[][]byte) // slice of struct fields indexs
for _, i := range findicies {
ele := buildPlaceHolder(i, pnewele.Elem(), sfis, sfises)
data = append(data, ele)
}
if !iter.Scan(data...) {
break
}
marshalTo(pnewele.Elem(), sfis, sfises)
ps.Index(0).Set(pnewele)
val = reflect.AppendSlice(val, ps)
}
v.Set(val)
return iter.Close()
}
func unmarshalPointerToStruct(b []byte, tf reflect.Type) (reflect.Value, error) {
pf := reflect.New(tf.Elem())
err := proto.Unmarshal(b, pf.Interface().(proto.Message))
if err != nil {
return reflect.Value{}, err
}
return pf, nil
}
func buildPlaceHolder(i int, f reflect.Value, sfis map[int]*[]byte, sfises map[int]*[][]byte) interface{} {
vf := f.Field(i)
if vf.Type().Kind() == reflect.Slice && vf.Type().Elem().Kind() == reflect.Ptr {
var bs [][]byte
sfises[i] = &bs
return &bs
} else if vf.Type().Kind() == reflect.Ptr && vf.Type().Elem().Kind() == reflect.Struct {
var b []byte
sfis[i] = &b
return &b
} else {
return vf.Addr().Interface()
}
}
func marshalTo(val reflect.Value, sfis map[int]*[]byte, sfises map[int]*[][]byte) error {
for k, v := range sfis {
if v == nil {
continue
}
pf, err := unmarshalPointerToStruct(*v, val.Field(k).Type())
if err != nil {
return err
}
val.Field(k).Set(pf)
}
for k, v := range sfises {
if v == nil {
continue
}
vf := val.Field(k)
dest := reflect.MakeSlice(vf.Type(), 0, 0)
ss := reflect.MakeSlice(vf.Type(), 1, 1)
for _, b := range *v {
pe := reflect.New(vf.Type().Elem().Elem())
proto.Unmarshal(b, pe.Interface().(proto.Message))
ss.Index(0).Set(pe)
dest = reflect.AppendSlice(dest, ss)
}
vf.Set(dest)
}
return nil
}