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parser.go
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parser.go
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package influx
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"time"
influx "github.com/influxdata/influxdb/client/v2"
)
type queryValues struct {
name string
values map[string][]interface{}
}
func parseResult(r influx.Result) ([]queryValues, error) {
if len(r.Err) > 0 {
return nil, fmt.Errorf("result error: %s", r.Err)
}
qValues := make([]queryValues, len(r.Series))
for i, row := range r.Series {
values := make(map[string][]interface{}, len(row.Values))
for _, value := range row.Values {
for idx, v := range value {
key := row.Columns[idx]
values[key] = append(values[key], v)
}
}
qValues[i] = queryValues{
name: row.Name,
values: values,
}
}
return qValues, nil
}
func toFloat64(v interface{}) (float64, error) {
switch i := v.(type) {
case json.Number:
return i.Float64()
case float64:
return i, nil
case float32:
return float64(i), nil
case int64:
return float64(i), nil
case int32:
return float64(i), nil
case int:
return float64(i), nil
case uint64:
return float64(i), nil
case uint32:
return float64(i), nil
case uint:
return float64(i), nil
case string:
return strconv.ParseFloat(i, 64)
case bool:
if i {
return 1, nil
}
return 0, nil
default:
return 0, fmt.Errorf("unexpected value type %v", i)
}
}
func parseDate(dateStr string) (int64, error) {
startTime, err := time.Parse(time.RFC3339, dateStr)
if err != nil {
return 0, fmt.Errorf("cannot parse %q: %s", dateStr, err)
}
return startTime.UnixNano() / 1e6, nil
}
func stringify(q influx.Query) string {
return fmt.Sprintf("command: %q; database: %q; retention: %q",
q.Command, q.Database, q.RetentionPolicy)
}
func (s *Series) unmarshal(v string) error {
noEscapeChars := strings.IndexByte(v, '\\') < 0
n := nextUnescapedChar(v, ',', noEscapeChars)
if n < 0 {
s.Measurement = unescapeTagValue(v, noEscapeChars)
return nil
}
s.Measurement = unescapeTagValue(v[:n], noEscapeChars)
var err error
s.LabelPairs, err = unmarshalTags(v[n+1:], noEscapeChars)
if err != nil {
return fmt.Errorf("failed to unmarhsal tags: %s", err)
}
return nil
}
func unmarshalTags(s string, noEscapeChars bool) ([]LabelPair, error) {
var result []LabelPair
for {
lp := LabelPair{}
n := nextUnescapedChar(s, ',', noEscapeChars)
if n < 0 {
if err := lp.unmarshal(s, noEscapeChars); err != nil {
return nil, err
}
if len(lp.Name) == 0 || len(lp.Value) == 0 {
return nil, nil
}
result = append(result, lp)
return result, nil
}
if err := lp.unmarshal(s[:n], noEscapeChars); err != nil {
return nil, err
}
s = s[n+1:]
if len(lp.Name) == 0 || len(lp.Value) == 0 {
continue
}
result = append(result, lp)
}
}
func (lp *LabelPair) unmarshal(s string, noEscapeChars bool) error {
n := nextUnescapedChar(s, '=', noEscapeChars)
if n < 0 {
return fmt.Errorf("missing tag value for %q", s)
}
lp.Name = unescapeTagValue(s[:n], noEscapeChars)
lp.Value = unescapeTagValue(s[n+1:], noEscapeChars)
return nil
}
func unescapeTagValue(s string, noEscapeChars bool) string {
if noEscapeChars {
// Fast path - no escape chars.
return s
}
n := strings.IndexByte(s, '\\')
if n < 0 {
return s
}
// Slow path. Remove escape chars.
dst := make([]byte, 0, len(s))
for {
dst = append(dst, s[:n]...)
s = s[n+1:]
if len(s) == 0 {
return string(append(dst, '\\'))
}
ch := s[0]
if ch != ' ' && ch != ',' && ch != '=' && ch != '\\' {
dst = append(dst, '\\')
}
dst = append(dst, ch)
s = s[1:]
n = strings.IndexByte(s, '\\')
if n < 0 {
return string(append(dst, s...))
}
}
}
func nextUnescapedChar(s string, ch byte, noEscapeChars bool) int {
if noEscapeChars {
// Fast path: just search for ch in s, since s has no escape chars.
return strings.IndexByte(s, ch)
}
sOrig := s
again:
n := strings.IndexByte(s, ch)
if n < 0 {
return -1
}
if n == 0 {
return len(sOrig) - len(s) + n
}
if s[n-1] != '\\' {
return len(sOrig) - len(s) + n
}
nOrig := n
slashes := 0
for n > 0 && s[n-1] == '\\' {
slashes++
n--
}
if slashes&1 == 0 {
return len(sOrig) - len(s) + nOrig
}
s = s[nOrig+1:]
goto again
}