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query.go
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query.go
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package reindexer
import (
"errors"
"fmt"
"reflect"
"strings"
"sync"
"unsafe"
"github.com/restream/reindexer/bindings"
"github.com/restream/reindexer/cjson"
)
// Constants for query serialization
const (
queryCondition = bindings.QueryCondition
queryDistinct = bindings.QueryDistinct
querySortIndex = bindings.QuerySortIndex
queryJoinOn = bindings.QueryJoinOn
queryLimit = bindings.QueryLimit
queryOffset = bindings.QueryOffset
queryReqTotal = bindings.QueryReqTotal
queryDebugLevel = bindings.QueryDebugLevel
queryAggregation = bindings.QueryAggregation
querySelectFilter = bindings.QuerySelectFilter
queryExplain = bindings.QueryExplain
QuerySelectFunction = bindings.QuerySelectFunction
QueryEqualPosition = bindings.QueryEqualPosition
queryEnd = bindings.QueryEnd
)
// Constants for calc total
const (
modeNoCalc = bindings.ModeNoCalc
modeCachedTotal = bindings.ModeCachedTotal
modeAccurateTotal = bindings.ModeAccurateTotal
)
// Operator
const (
opAND = bindings.OpAnd
opOR = bindings.OpOr
opNOT = bindings.OpNot
)
// Join type
const (
innerJoin = bindings.InnerJoin
orInnerJoin = bindings.OrInnerJoin
leftJoin = bindings.LeftJoin
merge = bindings.Merge
)
const (
cInt32Max = bindings.CInt32Max
valueInt = bindings.ValueInt
valueBool = bindings.ValueBool
valueInt64 = bindings.ValueInt64
valueDouble = bindings.ValueDouble
valueString = bindings.ValueString
valueComposite = bindings.ValueComposite
valueTuple = bindings.ValueTuple
)
const (
defaultFetchCount = 100
)
type nsArrayEntry struct {
*reindexerNamespace
localCjsonState cjson.State
}
// Query to DB object
type Query struct {
Namespace string
db *Reindexer
nextOp int
ser cjson.Serializer
root *Query
joinQueries []*Query
mergedQueries []*Query
joinToFields []string
joinHandlers []JoinHandler
context interface{}
joinType int
closed bool
initBuf [256]byte
nsArray []nsArrayEntry
ptVersions []int32
iterator Iterator
jsonIterator JSONIterator
items []interface{}
json []byte
jsonOffsets []int
totalName string
executed bool
fetchCount int
}
var queryPool sync.Pool
// Create new DB query
func newQuery(db *Reindexer, namespace string) *Query {
var q *Query
obj := queryPool.Get()
if obj != nil {
q = obj.(*Query)
}
if q == nil {
q = &Query{}
q.ser = cjson.NewSerializer(q.initBuf[:0])
} else {
q.nextOp = 0
q.root = nil
q.joinType = 0
q.context = nil
q.joinToFields = q.joinToFields[:0]
q.joinQueries = q.joinQueries[:0]
q.joinHandlers = q.joinHandlers[:0]
q.mergedQueries = q.mergedQueries[:0]
q.ptVersions = q.ptVersions[:0]
q.ser = cjson.NewSerializer(q.ser.Bytes()[:0])
q.closed = false
q.totalName = ""
q.executed = false
q.nsArray = q.nsArray[:0]
}
q.Namespace = namespace
q.db = db
q.nextOp = opAND
q.fetchCount = defaultFetchCount
q.ser.PutVString(namespace)
return q
}
// Where - Add where condition to DB query
// For composite indexes keys must be []interface{}, with value of each subindex
func (q *Query) Where(index string, condition int, keys interface{}) *Query {
t := reflect.TypeOf(keys)
v := reflect.ValueOf(keys)
q.ser.PutVarCUInt(queryCondition)
q.ser.PutVString(index)
q.ser.PutVarCUInt(q.nextOp)
q.ser.PutVarCUInt(condition)
q.nextOp = opAND
if keys == nil {
q.ser.PutVarUInt(0)
} else if t.Kind() == reflect.Slice || t.Kind() == reflect.Array {
q.ser.PutVarCUInt(v.Len())
for i := 0; i < v.Len(); i++ {
q.putValue(v.Index(i))
}
} else {
q.ser.PutVarCUInt(1)
q.putValue(v)
}
return q
}
func (q *Query) putValue(v reflect.Value) error {
k := v.Kind()
if k == reflect.Ptr || k == reflect.Interface {
v = v.Elem()
k = v.Kind()
}
switch k {
case reflect.Bool:
q.ser.PutVarCUInt(valueBool)
if v.Bool() {
q.ser.PutVarUInt(1)
} else {
q.ser.PutVarUInt(0)
}
case reflect.Uint:
if unsafe.Sizeof(int(0)) == unsafe.Sizeof(int64(0)) {
q.ser.PutVarCUInt(valueInt64)
} else {
q.ser.PutVarCUInt(valueInt)
}
q.ser.PutVarInt(int64(v.Uint()))
case reflect.Int:
if unsafe.Sizeof(int(0)) == unsafe.Sizeof(int64(0)) {
q.ser.PutVarCUInt(valueInt64)
} else {
q.ser.PutVarCUInt(valueInt)
}
q.ser.PutVarInt(v.Int())
case reflect.Int16, reflect.Int32, reflect.Int8:
q.ser.PutVarCUInt(valueInt)
q.ser.PutVarInt(v.Int())
case reflect.Uint8, reflect.Uint16, reflect.Uint32:
q.ser.PutVarCUInt(valueInt)
q.ser.PutVarInt(int64(v.Uint()))
case reflect.Int64:
q.ser.PutVarCUInt(valueInt64)
q.ser.PutVarInt(v.Int())
case reflect.Uint64:
q.ser.PutVarCUInt(valueInt64)
q.ser.PutVarInt(int64(v.Uint()))
case reflect.String:
q.ser.PutVarCUInt(valueString)
q.ser.PutVString(v.String())
case reflect.Float32, reflect.Float64:
q.ser.PutVarCUInt(valueDouble)
q.ser.PutDouble(v.Float())
case reflect.Slice, reflect.Array:
q.ser.PutVarCUInt(valueTuple)
q.ser.PutVarCUInt(v.Len())
for i := 0; i < v.Len(); i++ {
q.putValue(v.Index(i))
}
default:
panic(fmt.Errorf("rq: Invalid reflection type %s", v.Kind().String()))
}
return nil
}
// WhereInt - Add where condition to DB query with int args
func (q *Query) WhereInt(index string, condition int, keys ...int) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueInt).PutVarInt(int64(v))
}
return q
}
// WhereInt - Add where condition to DB query with int args
func (q *Query) WhereInt32(index string, condition int, keys ...int32) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueInt).PutVarInt(int64(v))
}
return q
}
// WhereInt64 - Add where condition to DB query with int64 args
func (q *Query) WhereInt64(index string, condition int, keys ...int64) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueInt64).PutVarInt(v)
}
return q
}
// WhereString - Add where condition to DB query with string args
func (q *Query) WhereString(index string, condition int, keys ...string) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueString).PutVString(v)
}
return q
}
// WhereComposite - Add where condition to DB query with interface args for composite indexes
func (q *Query) WhereComposite(index string, condition int, keys ...interface{}) *Query {
return q.Where(index, condition, keys)
}
// WhereString - Add where condition to DB query with string args
func (q *Query) Match(index string, keys ...string) *Query {
return q.WhereString(index, EQ, keys...)
}
// WhereString - Add where condition to DB query with bool args
func (q *Query) WhereBool(index string, condition int, keys ...bool) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueBool)
if v {
q.ser.PutVarUInt(1)
} else {
q.ser.PutVarUInt(0)
}
}
return q
}
// WhereDouble - Add where condition to DB query with float args
func (q *Query) WhereDouble(index string, condition int, keys ...float64) *Query {
q.ser.PutVarCUInt(queryCondition).PutVString(index).PutVarCUInt(q.nextOp).PutVarCUInt(condition)
q.nextOp = opAND
q.ser.PutVarCUInt(len(keys))
for _, v := range keys {
q.ser.PutVarCUInt(valueDouble).PutDouble(v)
}
return q
}
// Aggregate - Return aggregation of field
func (q *Query) Aggregate(index string, aggType int) *Query {
q.ser.PutVarCUInt(queryAggregation).PutVString(index).PutVarCUInt(aggType)
return q
}
// Sort - Apply sort order to returned from query items
// If values argument specified, then items equal to values, if found will be placed in the top positions
// For composite indexes values must be []interface{}, with value of each subindex
func (q *Query) Sort(sortIndex string, desc bool, values ...interface{}) *Query {
q.ser.PutVarCUInt(querySortIndex)
q.ser.PutVString(sortIndex)
if desc {
q.ser.PutVarUInt(1)
} else {
q.ser.PutVarUInt(0)
}
q.ser.PutVarCUInt(len(values))
for i := 0; i < len(values); i++ {
q.putValue(reflect.ValueOf(values[i]))
}
return q
}
// OR - next condition will added with OR
func (q *Query) Or() *Query {
q.nextOp = opOR
return q
}
// Not - next condition will added with NOT AND
func (q *Query) Not() *Query {
q.nextOp = opNOT
return q
}
// Distinct - Return only items with uniq value of field
func (q *Query) Distinct(distinctIndex string) *Query {
q.ser.PutVarCUInt(queryDistinct)
q.ser.PutVString(distinctIndex)
return q
}
// ReqTotal Request total items calculation
func (q *Query) ReqTotal(totalNames ...string) *Query {
q.ser.PutVarCUInt(queryReqTotal)
q.ser.PutVarCUInt(modeAccurateTotal)
if len(totalNames) != 0 {
q.totalName = totalNames[0]
}
return q
}
// CachedTotal Request cached total items calculation
func (q *Query) CachedTotal(totalNames ...string) *Query {
q.ser.PutVarCUInt(queryReqTotal)
q.ser.PutVarCUInt(modeCachedTotal)
if len(totalNames) != 0 {
q.totalName = totalNames[0]
}
return q
}
// Limit - Set limit (count) of returned items
func (q *Query) Limit(limitItems int) *Query {
if limitItems > cInt32Max {
limitItems = cInt32Max
}
q.ser.PutVarCUInt(queryLimit).PutVarCUInt(limitItems)
return q
}
// Offset - Set start offset of returned items
func (q *Query) Offset(startOffset int) *Query {
if startOffset > cInt32Max {
startOffset = cInt32Max
}
q.ser.PutVarCUInt(queryOffset).PutVarCUInt(startOffset)
return q
}
// Debug - Set debug level
func (q *Query) Debug(level int) *Query {
q.ser.PutVarCUInt(queryDebugLevel).PutVarCUInt(level)
return q
}
// Explain - Request explain for query
func (q *Query) Explain() *Query {
q.ser.PutVarCUInt(queryExplain)
return q
}
// SetContext set interface, which will be passed to Joined interface
func (q *Query) SetContext(ctx interface{}) *Query {
q.context = ctx
if q.root != nil {
q.root.context = ctx
}
return q
}
// Exec will execute query, and return slice of items
func (q *Query) Exec() *Iterator {
if q.root != nil {
q = q.root
}
if q.closed {
panic(errors.New("Exec call on already closed query. You shoud create new Query"))
}
if q.executed {
panic(errors.New("Exec call on already executed query. You shoud create new Query"))
}
q.executed = true
return q.db.execQuery(q)
}
// ExecAsJson will execute query, and return iterator
func (q *Query) ExecToJson(jsonRoots ...string) *JSONIterator {
if q.root != nil {
q = q.root
}
if q.closed {
panic(errors.New("Exec call on already closed query. You shoud create new Query"))
}
if q.executed {
panic(errors.New("Exec call on already executed query. You shoud create new Query"))
}
q.executed = true
jsonRoot := q.Namespace
if len(jsonRoots) != 0 && len(jsonRoots[0]) != 0 {
jsonRoot = jsonRoots[0]
}
return q.db.execJSONQuery(q, jsonRoot)
}
func (q *Query) close() {
if q.root != nil {
q = q.root
}
if q.closed {
panic(errors.New("Close call on already closed query"))
}
for i, jq := range q.joinQueries {
jq.closed = true
queryPool.Put(jq)
q.joinQueries[i] = nil
}
for i, mq := range q.mergedQueries {
mq.closed = true
queryPool.Put(mq)
q.mergedQueries[i] = nil
}
for i := range q.joinHandlers {
q.joinHandlers[i] = nil
}
q.closed = true
queryPool.Put(q)
}
// Delete will execute query, and delete items, matches query
// On sucess return number of deleted elements
func (q *Query) Delete() (int, error) {
if q.root != nil || len(q.joinQueries) != 0 {
return 0, errors.New("Delete does not support joined queries")
}
if q.closed {
panic(errors.New("Delete call on already closed query. You shoud create new Query"))
}
defer q.close()
return q.db.deleteQuery(q)
}
// MustExec will execute query, and return iterator, panic on error
func (q *Query) MustExec() *Iterator {
it := q.Exec()
if it.err != nil {
panic(it.err)
}
return it
}
// Get will execute query, and return 1 st item, panic on error
func (q *Query) Get() (item interface{}, found bool) {
iter := q.Limit(1).MustExec()
defer iter.Close()
if iter.Next() {
return iter.Object(), true
}
return nil, false
}
// Get will execute query, and return 1 st item, panic on error
func (q *Query) GetJson() (json []byte, found bool) {
it := q.Limit(1).ExecToJson()
defer it.Close()
if it.Error() != nil {
panic(it.Error())
}
if !it.Next() {
return nil, false
}
return it.JSON(), true
}
// Join joins 2 queries
func (q *Query) join(q2 *Query, field string, joinType int) *Query {
if q.root != nil {
q = q.root
}
if q2.root != nil {
panic(errors.New("query.Join call on already joined query. You shoud create new Query"))
}
q2.joinType = joinType
q2.root = q
q.joinQueries = append(q.joinQueries, q2)
q.joinToFields = append(q.joinToFields, field)
q.joinHandlers = append(q.joinHandlers, nil)
return q2
}
// InnerJoin joins 2 queries
// Items from the 1-st query are filtered by and expanded with the data from the 2-nd query
//
// `field` parameter serves as unique identifier for the join between `q` and `q2`
// One of the conditions below must hold for `field` parameter in order for InnerJoin to work:
// - namespace of `q2` contains `field` as one of its fields marked as `joined`
// - `q` has a join handler (registered via `q.JoinHandler(...)` call) with the same `field` value
func (q *Query) InnerJoin(q2 *Query, field string) *Query {
if q.nextOp == opOR {
q.nextOp = opAND
return q.join(q2, field, orInnerJoin)
}
return q.join(q2, field, innerJoin)
}
// Join is an alias for LeftJoin
func (q *Query) Join(q2 *Query, field string) *Query {
return q.join(q2, field, leftJoin)
}
// LeftJoin joins 2 queries
// Items from the 1-st query are expanded with the data from the 2-nd query
//
// `field` parameter serves as unique identifier for the join between `q` and `q2`
// One of the conditions below must hold for `field` parameter in order for LeftJoin to work:
// - namespace of `q2` contains `field` as one of its fields marked as `joined`
// - `q` has a join handler (registered via `q.JoinHandler(...)` call) with the same `field` value
func (q *Query) LeftJoin(q2 *Query, field string) *Query {
return q.join(q2, field, leftJoin)
}
// JoinHandler registers join handler that will be called when join, registered on `field` value, finds a match
func (q *Query) JoinHandler(field string, handler JoinHandler) *Query {
index := -1
for i := range q.joinToFields {
if strings.EqualFold(q.joinToFields[i], field) {
index = i
}
}
if index != -1 {
q.joinHandlers[index] = handler
}
return q
}
// Merge 2 queries
func (q *Query) Merge(q2 *Query) *Query {
if q.root != nil {
q = q.root
}
if q2.root != nil {
q2 = q2.root
}
q2.root = q
q.mergedQueries = append(q.mergedQueries, q2)
return q
}
// On specifies join condition
//
// `index` parameter specifies which field from `q` namespace should be used during join
// `condition` parameter specifies how `q` will be joined with the latest join query issued on `q` (e.g. `EQ`/`GT`/`SET`/...)
// `joinIndex` parameter specifies which field from namespace for the latest join query issued on `q` should be used during join
func (q *Query) On(index string, condition int, joinIndex string) *Query {
if q.closed {
panic(errors.New("query.On call on already closed query. You shoud create new Query"))
}
if q.root == nil {
panic(fmt.Errorf("Can't join on root query"))
}
q.ser.PutVarCUInt(queryJoinOn)
q.ser.PutVarCUInt(q.nextOp)
q.ser.PutVarCUInt(condition)
q.ser.PutVString(index)
q.ser.PutVString(joinIndex)
q.nextOp = opAND
return q
}
// Select add filter to fields of result's objects
func (q *Query) Select(fields ...string) *Query {
for _, field := range fields {
q.ser.PutVarCUInt(querySelectFilter).PutVString(field)
}
return q
}
// FetchCount sets the number of items that will be fetched by one operation
// When n <= 0 query will fetch all results in one operation
func (q *Query) FetchCount(n int) *Query {
q.fetchCount = n
return q
}
// Select add filter to fields of result's objects
func (q *Query) Functions(fields ...string) *Query {
for _, field := range fields {
q.ser.PutVarCUInt(QuerySelectFunction).PutVString(field)
}
return q
}
// Adds equal position fields to arrays
func (q *Query) EqualPosition(fields ...string) *Query {
q.ser.PutVarCUInt(QueryEqualPosition)
q.ser.PutVarCUInt(len(fields))
for _, field := range fields {
q.ser.PutVString(field)
}
return q
}