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|
package influxql
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"time"
)
// Value represents a value that can be bound
// to a parameter when parsing the query.
type Value interface {
TokenType() Token
Value() string
}
type (
// Identifier is an identifier value.
Identifier string
// StringValue is a string literal.
StringValue string
// RegexValue is a regexp literal.
RegexValue string
// NumberValue is a number literal.
NumberValue float64
// IntegerValue is an integer literal.
IntegerValue int64
// BooleanValue is a boolean literal.
BooleanValue bool
// DurationValue is a duration literal.
DurationValue string
// ErrorValue is a special value that returns an error during parsing
// when it is used.
ErrorValue string
)
// BindValue will bind an interface value to its influxql value.
// This method of binding values only supports literals.
func BindValue(v interface{}) Value {
if jv, ok := v.(json.Number); ok {
var err error
v, err = jsonNumberToValue(jv)
if err != nil {
return ErrorValue(err.Error())
}
}
switch v := v.(type) {
case float64:
return NumberValue(v)
case int64:
return IntegerValue(v)
case string:
return StringValue(v)
case bool:
return BooleanValue(v)
case map[string]interface{}:
return bindObjectValue(v)
default:
s := fmt.Sprintf("unable to bind parameter with type %T", v)
return ErrorValue(s)
}
}
// bindObjectValue will bind an object to a value.
func bindObjectValue(m map[string]interface{}) Value {
if len(m) != 1 {
return ErrorValue("bound object parameter value must have exactly one entry")
}
var (
k string
v interface{}
)
for k, v = range m {
// Nothing done here.
}
if jv, ok := v.(json.Number); ok {
var err error
v, err = jsonNumberToValue(jv)
if err != nil {
return ErrorValue(err.Error())
}
}
switch k {
case "ident", "identifier":
s, ok := v.(string)
if !ok {
return ErrorValue("identifier must be a string value")
}
return Identifier(s)
case "regex":
s, ok := v.(string)
if !ok {
return ErrorValue("regex literal must be a string value")
}
return RegexValue(s)
case "string":
s, ok := v.(string)
if !ok {
return ErrorValue("string literal must be a string value")
}
return StringValue(s)
case "float", "number":
switch f := v.(type) {
case float64:
return NumberValue(f)
case int64:
return NumberValue(f)
default:
return ErrorValue("number literal must be a float value")
}
case "int", "integer":
i, ok := v.(int64)
if !ok {
return ErrorValue("integer literal must be an integer value")
}
return IntegerValue(i)
case "duration":
switch d := v.(type) {
case string:
return DurationValue(d)
case int64:
return DurationValue(FormatDuration(time.Duration(d)))
default:
return ErrorValue("duration literal must be a string or integer value")
}
default:
return ErrorValue(fmt.Sprintf("unknown bind object type: %s", k))
}
}
func (v Identifier) TokenType() Token { return IDENT }
func (v Identifier) Value() string { return string(v) }
func (v StringValue) TokenType() Token { return STRING }
func (v StringValue) Value() string { return string(v) }
func (v RegexValue) TokenType() Token { return REGEX }
func (v RegexValue) Value() string { return string(v) }
func (v NumberValue) TokenType() Token { return NUMBER }
func (v NumberValue) Value() string { return strconv.FormatFloat(float64(v), 'f', -1, 64) }
func (v IntegerValue) TokenType() Token { return INTEGER }
func (v IntegerValue) Value() string { return strconv.FormatInt(int64(v), 10) }
func (v BooleanValue) TokenType() Token {
if v {
return TRUE
} else {
return FALSE
}
}
func (v BooleanValue) Value() string { return "" }
func (v DurationValue) TokenType() Token { return DURATIONVAL }
func (v DurationValue) Value() string { return string(v) }
func (e ErrorValue) TokenType() Token { return BOUNDPARAM }
func (e ErrorValue) Value() string { return string(e) }
func jsonNumberToValue(v json.Number) (interface{}, error) {
if strings.Contains(string(v), ".") {
f, err := v.Float64()
if err != nil {
return nil, err
}
return f, nil
} else {
i, err := v.Int64()
if err != nil {
return nil, err
}
return i, nil
}
}
|
