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https://github.com/cgrates/cgrates.git
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120 lines
3.7 KiB
Go
120 lines
3.7 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package config
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/antchfx/xmlquery"
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"github.com/cgrates/cgrates/utils"
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)
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// NewXMLProvider constructs a utils.DataProvider
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func NewXMLProvider(req *xmlquery.Node, cdrPath utils.HierarchyPath) (dP utils.DataProvider) {
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dP = &XMLProvider{
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req: req,
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cdrPath: cdrPath,
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cache: utils.MapStorage{},
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}
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return
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}
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// XmlProvider implements engine.utils.DataProvider, allowing it to be passed to filters.
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// An instance of XmlProvider is created for each element retrieved from xmlquery.QueryAll.
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type XMLProvider struct {
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// req is the root node of each individual XML element retrieved.
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// It acts as the starting point for extracting data from the XML element.
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req *xmlquery.Node
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// cdrPath is the root path used to calculate the relative path.
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// The relative path is computed by trimming cdrPath from the full path of the XML element.
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cdrPath utils.HierarchyPath
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// cache stores the inner text of XML elements.
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// The key is the relative path of the XML element.
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cache utils.MapStorage
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}
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// String is part of engine.utils.DataProvider interface
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// when called, it will display the already parsed values out of cache
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func (xP *XMLProvider) String() string {
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return xP.cache.String()
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}
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// FieldAsInterface is part of engine.utils.DataProvider interface
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func (xP *XMLProvider) FieldAsInterface(fldPath []string) (data any, err error) {
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if len(fldPath) == 0 {
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return nil, utils.ErrNotFound
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}
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if data, err = xP.cache.FieldAsInterface(fldPath); err == nil ||
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err != utils.ErrNotFound { // item found in cache
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return
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}
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err = nil // cancel previous err
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relPath := utils.HierarchyPath(fldPath[len(xP.cdrPath):])
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var slctrStr string
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for i := range relPath {
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if sIdx := strings.Index(relPath[i], "["); sIdx != -1 {
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slctrStr = relPath[i][sIdx:]
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if slctrStr[len(slctrStr)-1] != ']' {
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return nil, fmt.Errorf("filter rule <%s> needs to end in ]", slctrStr)
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}
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relPath[i] = relPath[i][:sIdx]
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if slctrStr[1] != '@' {
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i, err := strconv.Atoi(slctrStr[1 : len(slctrStr)-1])
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if err != nil {
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return nil, err
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}
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slctrStr = "[" + strconv.Itoa(i+1) + "]"
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}
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relPath[i] = relPath[i] + slctrStr
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}
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}
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data, err = ElementText(xP.req, relPath.AsString("/", false))
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xP.cache.Set(fldPath, data)
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return
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}
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// FieldAsString is part of engine.utils.DataProvider interface
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func (xP *XMLProvider) FieldAsString(fldPath []string) (data string, err error) {
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var valIface any
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valIface, err = xP.FieldAsInterface(fldPath)
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if err != nil {
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return
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}
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return utils.IfaceAsString(valIface), nil
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}
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// ElementText will process the node to extract the elementName's text out of it (only first one found)
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// returns utils.ErrNotFound if the element is not found in the node
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// Make the method exportable until we remove the ers
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func ElementText(xmlElement *xmlquery.Node, elmntPath string) (string, error) {
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elmnt, err := xmlquery.Query(xmlElement, elmntPath)
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if err != nil {
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return "", err
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}
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if elmnt == nil {
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return "", utils.ErrNotFound
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}
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return elmnt.InnerText(), nil
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}
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