/
context.go
312 lines (286 loc) · 9.41 KB
/
context.go
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package datasource
import (
"bytes"
"database/sql/driver"
"hash/fnv"
"strings"
"time"
"github.com/araddon/qlbridge/expr"
"github.com/araddon/qlbridge/schema"
"github.com/araddon/qlbridge/value"
)
var (
// Ensure our ContextReaders implement interface
// context-readers hold "State" for evaluation in vm.
_ expr.ContextReader = (*ContextSimple)(nil)
_ expr.ContextReader = (*SqlDriverMessageMap)(nil)
// Context Writers hold write state of vm
_ expr.ContextWriter = (*ContextSimple)(nil)
// Message is passed between tasks/actors across distributed
// boundaries. May be context reader/writer.
_ schema.Message = (*ContextSimple)(nil)
_ schema.Message = (*SqlDriverMessage)(nil)
_ schema.Message = (*SqlDriverMessageMap)(nil)
)
// MessageConversion convert values of type schema.Message.
func MessageConversion(vals []interface{}) []schema.Message {
msgs := make([]schema.Message, len(vals))
for i, v := range vals {
msgs[i] = v.(schema.Message)
}
return msgs
}
type (
// SqlDriverMessage context message of values.
SqlDriverMessage struct {
Vals []driver.Value
IdVal uint64
}
// SqlDriverMessageMap Context message with column/position info.
SqlDriverMessageMap struct {
Vals []driver.Value // Values
ColIndex map[string]int // Map of column names to ordinal position in vals
IdVal uint64 // id()
keyVal string // key Non Hashed Key Value
}
ContextSimple struct {
Data map[string]value.Value
ts time.Time
cursor int
keyval uint64
namespacing bool
}
NestedContextReader struct {
readers []expr.ContextReader
writer expr.ContextWriter
ts time.Time
}
NamespacedContextReader struct {
basereader expr.ContextReader
namespace string
}
)
func NewSqlDriverMessage(id uint64, row []driver.Value) *SqlDriverMessage {
return &SqlDriverMessage{IdVal: id, Vals: row}
}
func (m *SqlDriverMessage) Id() uint64 { return m.IdVal }
func (m *SqlDriverMessage) Body() interface{} { return m.Vals }
func (m *SqlDriverMessage) ToMsgMap(colidx map[string]int) *SqlDriverMessageMap {
return NewSqlDriverMessageMap(m.IdVal, m.Vals, colidx)
}
func NewSqlDriverMessageMapEmpty() *SqlDriverMessageMap {
return &SqlDriverMessageMap{}
}
func NewSqlDriverMessageMap(id uint64, row []driver.Value, colindex map[string]int) *SqlDriverMessageMap {
return &SqlDriverMessageMap{IdVal: id, ColIndex: colindex, Vals: row}
}
func NewSqlDriverMessageMapVals(id uint64, row []driver.Value, cols []string) *SqlDriverMessageMap {
if len(row) != len(cols) {
return &SqlDriverMessageMap{}
}
colindex := make(map[string]int, len(row))
for i := range row {
colindex[cols[i]] = i
}
return &SqlDriverMessageMap{IdVal: id, ColIndex: colindex, Vals: row}
}
func NewSqlDriverMessageMapCtx(id uint64, ctx expr.ContextReader, colindex map[string]int) *SqlDriverMessageMap {
row := make([]driver.Value, len(colindex))
for key, idx := range colindex {
val, ok := ctx.Get(key)
if ok {
row[idx] = val.Value()
}
}
return &SqlDriverMessageMap{IdVal: id, ColIndex: colindex, Vals: row}
}
func (m *SqlDriverMessageMap) Id() uint64 { return m.IdVal }
func (m *SqlDriverMessageMap) Key() driver.Value { return m.keyVal }
func (m *SqlDriverMessageMap) SetKey(key string) { m.keyVal = key }
func (m *SqlDriverMessageMap) SetKeyHashed(key string) {
m.keyVal = key
hasher64 := fnv.New64()
hasher64.Write([]byte(key))
m.IdVal = hasher64.Sum64()
}
func (m *SqlDriverMessageMap) Body() interface{} { return m }
func (m *SqlDriverMessageMap) Values() []driver.Value { return m.Vals }
func (m *SqlDriverMessageMap) SetRow(row []driver.Value) { m.Vals = row }
func (m *SqlDriverMessageMap) Ts() time.Time { return time.Time{} }
func (m *SqlDriverMessageMap) Get(key string) (value.Value, bool) {
if idx, ok := m.ColIndex[key]; ok {
return value.NewValue(m.Vals[idx]), true
}
_, right, hasLeft := expr.LeftRight(key)
//u.Debugf("could not find: %q right=%q hasLeftRight?%v", key, right, hasLeft)
if hasLeft {
if idx, ok := m.ColIndex[right]; ok {
return value.NewValue(m.Vals[idx]), true
}
}
return nil, false
}
func (m *SqlDriverMessageMap) Row() map[string]value.Value {
row := make(map[string]value.Value)
for k, idx := range m.ColIndex {
row[k] = value.NewValue(m.Vals[idx])
}
return row
}
func (m *SqlDriverMessageMap) Copy() *SqlDriverMessageMap {
nm := SqlDriverMessageMap{}
nm.Vals = m.Vals // we assume? that values are immutable anyways
nm.ColIndex = m.ColIndex
nm.IdVal = m.IdVal
nm.keyVal = m.keyVal
return &nm
}
func NewContextSimple() *ContextSimple {
return &ContextSimple{Data: make(map[string]value.Value), ts: time.Now(), cursor: 0}
}
func NewContextSimpleData(data map[string]value.Value) *ContextSimple {
return &ContextSimple{Data: data, ts: time.Now(), cursor: 0}
}
func NewContextSimpleNative(data map[string]interface{}) *ContextSimple {
vals := make(map[string]value.Value)
for k, v := range data {
vals[k] = value.NewValue(v)
}
return &ContextSimple{Data: vals, ts: time.Now(), cursor: 0, namespacing: true}
}
func NewContextMap(data map[string]interface{}, namespacing bool) *ContextSimple {
vals := make(map[string]value.Value)
for k, v := range data {
vals[k] = value.NewValue(v)
}
return &ContextSimple{Data: vals, ts: time.Now(), cursor: 0, namespacing: namespacing}
}
func NewContextMapTs(data map[string]interface{}, namespacing bool, ts time.Time) *ContextSimple {
vals := make(map[string]value.Value)
for k, v := range data {
vals[k] = value.NewValue(v)
}
return &ContextSimple{Data: vals, ts: ts, cursor: 0, namespacing: namespacing}
}
func NewContextSimpleTs(data map[string]value.Value, ts time.Time) *ContextSimple {
return &ContextSimple{Data: data, ts: ts, cursor: 0}
}
func (m *ContextSimple) SupportNamespacing() { m.namespacing = true }
func (m *ContextSimple) All() map[string]value.Value { return m.Data }
func (m *ContextSimple) Row() map[string]value.Value { return m.Data }
func (m *ContextSimple) Body() interface{} { return m }
func (m *ContextSimple) Id() uint64 { return m.keyval }
func (m *ContextSimple) Ts() time.Time { return m.ts }
func (m ContextSimple) Get(key string) (value.Value, bool) {
val, ok := m.Data[key]
if !ok && m.namespacing {
// We don't support namespacing by default?
left, right, hasNamespace := expr.LeftRight(key)
if !hasNamespace {
return nil, false
}
val, ok = m.Data[left]
if !ok {
return nil, false
}
if mv, isMap := val.(value.Map); isMap {
return mv.Get(right)
}
return nil, false
}
return val, ok
}
func (m *ContextSimple) Put(col expr.SchemaInfo, rctx expr.ContextReader, v value.Value) error {
m.Data[col.Key()] = v
return nil
}
func (m *ContextSimple) Commit(rowInfo []expr.SchemaInfo, row expr.RowWriter) error {
return nil
}
func (m *ContextSimple) Delete(row map[string]value.Value) error {
return nil
}
// NewNestedContextReader provides a context reader which is a composite of ordered child readers
// the first reader with a key will be used
func NewNestedContextReader(readers []expr.ContextReader, ts time.Time) expr.ContextReader {
return &NestedContextReader{readers, nil, ts}
}
// NewNestedContextReader provides a context reader which is a composite of ordered child readers
// the first reader with a key will be used
func NewNestedContextReadWriter(readers []expr.ContextReader, writer expr.ContextWriter, ts time.Time) expr.ContextReadWriter {
if rw, ok := writer.(expr.ContextReader); ok {
readers = append(readers, rw)
}
return &NestedContextReader{readers, writer, ts}
}
func (n *NestedContextReader) Get(key string) (value.Value, bool) {
for _, r := range n.readers {
val, ok := r.Get(key)
if ok && val != nil {
return val, ok
}
}
return nil, false
}
func (n *NestedContextReader) Row() map[string]value.Value {
current := make(map[string]value.Value)
for _, r := range n.readers {
for k, v := range r.Row() {
// already added this key from a "higher priority" reader
if _, ok := current[k]; ok {
continue
}
current[k] = v
}
}
return current
}
func (n *NestedContextReader) Ts() time.Time {
return n.ts
}
func (n *NestedContextReader) Put(col expr.SchemaInfo, readCtx expr.ContextReader, v value.Value) error {
if n.writer != nil {
return n.writer.Put(col, readCtx, v)
}
return nil
}
func (n *NestedContextReader) Delete(delRow map[string]value.Value) error {
if n.writer != nil {
return n.writer.Delete(delRow)
}
return nil
}
// NewNestedContextReader provides a context reader which prefixes
// all keys with a name space. This is useful if you have overlapping
// field names between ContextReaders within a NestedContextReader.
//
// msg.Get("foo.key")
//
func NewNamespacedContextReader(basereader expr.ContextReader, namespace string) expr.ContextReader {
if namespace == "" {
return basereader
}
return &NamespacedContextReader{basereader, strings.ToLower(namespace)}
}
func (n *NamespacedContextReader) Get(key string) (value.Value, bool) {
left, right, has := expr.LeftRight(key)
if !has || strings.ToLower(left) != n.namespace {
return nil, false
}
return n.basereader.Get(right)
}
func (n *NamespacedContextReader) Row() map[string]value.Value {
wraprow := make(map[string]value.Value)
sb := bytes.Buffer{}
for k, v := range n.basereader.Row() {
sb.Reset()
sb.WriteString(n.namespace)
sb.WriteString(".")
sb.WriteString(k)
wraprow[sb.String()] = v
}
return wraprow
}
func (n *NamespacedContextReader) Ts() time.Time {
return n.basereader.Ts()
}