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execute.go
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execute.go
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// Copyright 2023 Cisco Systems, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package uql
import (
"encoding/json"
"fmt"
"strings"
)
// Query represents a UQL request body
type Query struct {
Str string `json:"query"`
}
// parsedResponse contains unchanged response JSON and list of parsed data chunks
type parsedResponse struct {
chunks []parsedChunk
rawJson *json.RawMessage
}
// parsedChunk is a union of all fields on all UQL response dataset types
type parsedChunk struct {
Type string `json:"type"`
Model json.RawMessage `json:"model"`
Metadata map[string]any `json:"metadata"`
Dataset string `json:"dataset"`
Data [][]json.RawMessage `json:"data"`
Links map[string]rawLink `json:"_links"`
Error *Error `json:"error"`
}
type rawLink struct {
Href string `json:"href"`
}
type modelRef struct {
JsonPath string `json:"$jsonPath"`
Model string `json:"$model"`
}
// Default clients that can be used as `uql.Client` from other packages
// - Client should be used to go with the default API version (possibly overridden in fsoc config)
// - ClientV1 should be used when `v1` is required
var Client UqlClient = NewClient()
var ClientV1 UqlClient = NewClient(WithClientApiVersion(ApiVersion1))
func executeUqlQuery(query *Query, apiVersion ApiVersion, backend uqlService) (*Response, error) {
if query == nil || strings.Trim(query.Str, "") == "" {
return nil, fmt.Errorf("uql query missing")
}
if apiVersion == "" {
apiVersion = ApiVersionDefault
if GlobalConfig.ApiVersion != nil && *GlobalConfig.ApiVersion != "" {
apiVersion = *GlobalConfig.ApiVersion // from fsoc config file
}
}
response, err := backend.Execute(query, apiVersion)
if err != nil {
return nil, err
}
return processResponse(response)
}
func continueUqlQuery(dataSet *DataSet, rel string, backend uqlService) (*Response, error) {
link := extractLink(dataSet, rel)
if link == nil {
return nil, fmt.Errorf("link with rel '%s' not found in dataset", rel)
}
response, err := backend.Continue(link)
if err != nil {
return nil, err
}
return processResponse(response)
}
func extractLink(dataSet *DataSet, rel string) *Link {
if dataSet == nil {
return nil
}
if len(dataSet.Links) == 0 {
return nil
}
link, ok := dataSet.Links[rel]
if !ok {
return nil
}
return &link
}
func processResponse(response parsedResponse) (*Response, error) {
var model *Model
var dataSets = make(map[string]*DataSet)
var errorSets []*Error
var modelIndex map[string]*Model
for _, dataset := range response.chunks {
switch dataset.Type {
case "model":
err := json.Unmarshal(dataset.Model, &model)
if err != nil {
return nil, err
}
modelIndex = createModelIndex(model)
case "data":
var modelRef modelRef
err := json.Unmarshal(dataset.Model, &modelRef)
if err != nil {
return nil, err
}
var dataSetModel = modelIndex[modelRef.Model]
values, err := processValues(dataset.Data, dataSetModel)
if err != nil {
return nil, err
}
dataSets[dataset.Dataset] = &DataSet{
Name: dataset.Dataset,
DataModel: dataSetModel,
Metadata: dataset.Metadata,
Data: values,
Links: parseLinks(dataset.Links),
}
case "error":
errorSets = append(errorSets, dataset.Error)
}
}
resp := &Response{
model: model,
mainDataSet: resolveRefs(dataSets["d:main"], dataSets),
errors: errorSets,
raw: response.rawJson,
}
return resp, nil
}
func processValues(values [][]json.RawMessage, model *Model) ([][]any, error) {
var processedData [][]any
for rowIndex := range values {
var row []any
for columnIndex, field := range model.Fields {
if field.IsReference() {
value, err := dataSetRefDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
} else {
switch field.Type {
case "number":
value, err := longDeserializer(values[rowIndex][columnIndex])
if err != nil {
value, err := doubleDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
continue
}
row = append(row, value)
case "long":
value, err := longDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "double":
value, err := doubleDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "string", "csv":
value, err := stringDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "boolean":
value, err := booleanDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "timestamp":
value, err := timestampDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "complex", "timeseries": // inlined complex types
var value [][]json.RawMessage
err := json.Unmarshal(values[rowIndex][columnIndex], &value)
if err != nil {
return nil, err
}
processedValues, err := processValues(value, field.Model)
if err != nil {
return nil, err
}
row = append(row, ComplexData{
DataModel: field.Model,
Data: processedValues,
})
case "object": // unknown, mixed types
value, err := jsonScalarDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
case "json": // unknown json
value, err := jsonObjectDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
default: // unknown types
value, err := jsonScalarDeserializer(values[rowIndex][columnIndex])
if err != nil {
return nil, err
}
row = append(row, value)
}
}
}
processedData = append(processedData, row)
}
return processedData, nil
}
func parseLinks(rawLinks map[string]rawLink) map[string]Link {
links := make(map[string]Link)
for key, value := range rawLinks {
links[key] = Link(value)
}
return links
}
func createModelIndex(model *Model) map[string]*Model {
var index = make(map[string]*Model)
appendModelToIndex(model, index)
return index
}
func appendModelToIndex(model *Model, index map[string]*Model) {
index[model.Name] = model
for _, field := range model.Fields {
if field.Model != nil {
appendModelToIndex(field.Model, index)
}
}
}
func resolveRefs(dataSet *DataSet, dataSets map[string]*DataSet) *DataSet {
if dataSet == nil {
return nil
}
for r, row := range dataSet.Data {
for c, val := range row {
switch ref := val.(type) {
case DataSetRef:
referenced := resolveRefs(dataSets[ref.Dataset], dataSets)
dataSet.Data[r][c] = referenced
}
}
}
return dataSet
}