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azure-response-table-frame.go
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azure-response-table-frame.go
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package loganalytics
import (
"encoding/json"
"fmt"
"math"
"strconv"
"strings"
"time"
"github.com/grafana/grafana-plugin-sdk-go/data"
"github.com/grafana/grafana/pkg/tsdb/azuremonitor/types"
)
func apiErrorToNotice(err *AzureLogAnalyticsAPIError) data.Notice {
message := []string{}
severity := data.NoticeSeverityWarning
if err.Message != nil {
message = append(message, *err.Message)
}
if err.Details != nil && len(*err.Details) > 0 {
for _, detail := range *err.Details {
if detail.Message != nil {
message = append(message, *detail.Message)
}
if detail.Innererror != nil {
if detail.Innererror.Message != nil {
message = append(message, *detail.Innererror.Message)
}
if detail.Innererror.SeverityName != nil && *detail.Innererror.SeverityName == "Error" {
// Severity names are not documented in the API response format
// https://docs.microsoft.com/en-us/azure/azure-monitor/logs/api/response-format
// so assuming either an error or a warning
severity = data.NoticeSeverityError
}
}
}
}
return data.Notice{
Severity: severity,
Text: strings.Join(message, " "),
}
}
// ResponseTableToFrame converts an AzureResponseTable to a data.Frame.
func ResponseTableToFrame(table *types.AzureResponseTable, refID string, executedQuery string) (*data.Frame, error) {
if len(table.Rows) == 0 {
return &data.Frame{
RefID: refID,
Meta: &data.FrameMeta{
ExecutedQueryString: executedQuery,
},
}, nil
}
converterFrame, err := converterFrameForTable(table)
if err != nil {
return nil, err
}
for rowIdx, row := range table.Rows {
for fieldIdx, field := range row {
err = converterFrame.Set(fieldIdx, rowIdx, field)
if err != nil {
return nil, err
}
}
}
return converterFrame.Frame, nil
}
func converterFrameForTable(t *types.AzureResponseTable) (*data.FrameInputConverter, error) {
converters := []data.FieldConverter{}
colNames := make([]string, len(t.Columns))
colTypes := make([]string, len(t.Columns)) // for metadata
for i, col := range t.Columns {
colNames[i] = col.Name
colTypes[i] = col.Type
converter, ok := converterMap[col.Type]
if !ok {
return nil, fmt.Errorf("unsupported analytics column type %v", col.Type)
}
converters = append(converters, converter)
}
fic, err := data.NewFrameInputConverter(converters, len(t.Rows))
if err != nil {
return nil, err
}
err = fic.Frame.SetFieldNames(colNames...)
if err != nil {
return nil, err
}
fic.Frame.Meta = &data.FrameMeta{
Custom: &LogAnalyticsMeta{ColumnTypes: colTypes},
}
return fic, nil
}
var converterMap = map[string]data.FieldConverter{
"string": stringConverter,
"guid": stringConverter,
"timespan": stringConverter,
"dynamic": stringConverter,
"object": objectToStringConverter,
"datetime": timeConverter,
"int": intConverter,
"long": longConverter,
"real": realConverter,
"bool": boolConverter,
"decimal": decimalConverter,
"integer": intConverter,
"number": decimalConverter,
}
var stringConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableString,
Converter: func(v interface{}) (interface{}, error) {
var as *string
if v == nil {
return as, nil
}
s, ok := v.(string)
if !ok {
return nil, fmt.Errorf("unexpected type, expected string but got %T", v)
}
as = &s
return as, nil
},
}
var objectToStringConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableString,
Converter: func(kustoValue interface{}) (interface{}, error) {
var output *string
if kustoValue == nil {
return output, nil
}
data, err := json.Marshal(kustoValue)
if err != nil {
fmt.Printf("failed to marshal column value: %s", err)
}
asString := string(data)
output = &asString
return output, nil
},
}
var timeConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableTime,
Converter: func(v interface{}) (interface{}, error) {
var at *time.Time
if v == nil {
return at, nil
}
s, ok := v.(string)
if !ok {
return nil, fmt.Errorf("unexpected type, expected string but got %T", v)
}
t, err := time.Parse(time.RFC3339Nano, s)
if err != nil {
return nil, err
}
return &t, nil
},
}
var realConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableFloat64,
Converter: func(v interface{}) (interface{}, error) {
var af *float64
if v == nil {
return af, nil
}
jN, ok := v.(json.Number)
if !ok {
s, sOk := v.(string)
if sOk {
switch s {
case "Infinity":
f := math.Inf(0)
return &f, nil
case "-Infinity":
f := math.Inf(-1)
return &f, nil
case "NaN":
f := math.NaN()
return &f, nil
}
}
return nil, fmt.Errorf("unexpected type, expected json.Number but got type %T for value %v", v, v)
}
f, err := jN.Float64()
if err != nil {
return nil, err
}
return &f, err
},
}
var boolConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableBool,
Converter: func(v interface{}) (interface{}, error) {
var ab *bool
if v == nil {
return ab, nil
}
b, ok := v.(bool)
if !ok {
return nil, fmt.Errorf("unexpected type, expected bool but got %T", v)
}
return &b, nil
},
}
var intConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableInt32,
Converter: func(v interface{}) (interface{}, error) {
var ai *int32
if v == nil {
return ai, nil
}
jN, ok := v.(json.Number)
if !ok {
return nil, fmt.Errorf("unexpected type, expected json.Number but got %T", v)
}
var err error
iv, err := strconv.ParseInt(jN.String(), 10, 32)
if err != nil {
return nil, err
}
aInt := int32(iv)
return &aInt, nil
},
}
var longConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableInt64,
Converter: func(v interface{}) (interface{}, error) {
var ai *int64
if v == nil {
return ai, nil
}
jN, ok := v.(json.Number)
if !ok {
return nil, fmt.Errorf("unexpected type, expected json.Number but got %T", v)
}
out, err := jN.Int64()
if err != nil {
return nil, err
}
return &out, err
},
}
// decimalConverter converts the Kusto 128-bit type number to
// a float64. We do not have 128 bit numbers in our dataframe
// model yet (and even if we did, not sure how javascript would handle them).
// In the future, we may want to revisit storing this will proper precision,
// but for now it solves the case of people getting an error response.
// If we were to keep it a string, it would not work correctly with calls
// to functions like sdk's data.LongToWide.
var decimalConverter = data.FieldConverter{
OutputFieldType: data.FieldTypeNullableFloat64,
Converter: func(v interface{}) (interface{}, error) {
var af *float64
if v == nil {
return af, nil
}
jS, sOk := v.(string)
if sOk {
out, err := strconv.ParseFloat(jS, 64)
if err != nil {
return nil, err
}
return &out, err
}
// As far as I can tell this always comes in a string, but this is in the
// ADX code, so leaving this in case values do sometimes become a number somehow.
jN, nOk := v.(json.Number)
if !nOk {
return nil, fmt.Errorf("unexpected type, expected json.Number or string but got type %T with a value of %v", v, v)
}
out, err := jN.Float64() // Float64 calls strconv.ParseFloat64
if err != nil {
return nil, err
}
return &out, nil
},
}