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package influxql
import (
"encoding/json"
"errors"
"fmt"
"github.com/influxdata/influxdb/models"
)
const (
// WarningLevel is the message level for a warning.
WarningLevel = "warning"
)
// TagSet is a fundamental concept within the query system. It represents a composite series,
// composed of multiple individual series that share a set of tag attributes.
type TagSet struct {
Tags map[string]string
Filters []Expr
SeriesKeys []string
Key []byte
}
// AddFilter adds a series-level filter to the Tagset.
func (t *TagSet) AddFilter(key string, filter Expr) {
t.SeriesKeys = append(t.SeriesKeys, key)
t.Filters = append(t.Filters, filter)
}
func (t *TagSet) Len() int { return len(t.SeriesKeys) }
func (t *TagSet) Less(i, j int) bool { return t.SeriesKeys[i] < t.SeriesKeys[j] }
func (t *TagSet) Swap(i, j int) {
t.SeriesKeys[i], t.SeriesKeys[j] = t.SeriesKeys[j], t.SeriesKeys[i]
t.Filters[i], t.Filters[j] = t.Filters[j], t.Filters[i]
}
// Message represents a user-facing message to be included with the result.
type Message struct {
Level string `json:"level"`
Text string `json:"text"`
}
// ReadOnlyWarning generates a warning message that tells the user the command
// they are using is being used for writing in a read only context.
//
// This is a temporary method while to be used while transitioning to read only
// operations for issue #6290.
func ReadOnlyWarning(stmt string) *Message {
return &Message{
Level: WarningLevel,
Text: fmt.Sprintf("deprecated use of '%s' in a read only context, please use a POST request instead", stmt),
}
}
// Result represents a resultset returned from a single statement.
// Rows represents a list of rows that can be sorted consistently by name/tag.
type Result struct {
// StatementID is just the statement's position in the query. It's used
// to combine statement results if they're being buffered in memory.
StatementID int `json:"-"`
Series models.Rows
Messages []*Message
Err error
}
// MarshalJSON encodes the result into JSON.
func (r *Result) MarshalJSON() ([]byte, error) {
// Define a struct that outputs "error" as a string.
var o struct {
Series []*models.Row `json:"series,omitempty"`
Messages []*Message `json:"messages,omitempty"`
Err string `json:"error,omitempty"`
}
// Copy fields to output struct.
o.Series = r.Series
o.Messages = r.Messages
if r.Err != nil {
o.Err = r.Err.Error()
}
return json.Marshal(&o)
}
// UnmarshalJSON decodes the data into the Result struct
func (r *Result) UnmarshalJSON(b []byte) error {
var o struct {
Series []*models.Row `json:"series,omitempty"`
Messages []*Message `json:"messages,omitempty"`
Err string `json:"error,omitempty"`
}
err := json.Unmarshal(b, &o)
if err != nil {
return err
}
r.Series = o.Series
r.Messages = o.Messages
if o.Err != "" {
r.Err = errors.New(o.Err)
}
return nil
}
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