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/*
** Zabbix
** Copyright 2001-2022 Zabbix SIA
**
** Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
** documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
** rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in all copies or substantial portions
** of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
** WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
** COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
** SOFTWARE.
**/
// Package conf provides .conf file loading and unmarshalling
package conf
import (
"bytes"
"fmt"
)
// Node structure is used to store parsed conf file parameters or parameter components.
type Node struct {
Name string
Nodes []interface{}
Line int
used bool
parent *Node
level int
includeFail bool
}
type Value struct {
Value []byte
Line int
}
// get returns child node by name
func (n *Node) get(name string) (node *Node) {
for _, v := range n.Nodes {
if child, ok := v.(*Node); ok && child.Name == name {
return child
}
}
return nil
}
// add appends new child node
func (n *Node) add(name []byte, value []byte, lineNum int) {
var node *Node
var key string
split := bytes.IndexByte(name, '.')
if split == -1 {
key = string(name)
} else {
key = string(name[:split])
}
if node = n.get(key); node == nil {
node = &Node{
Name: string(key),
used: false,
Nodes: make([]interface{}, 0),
parent: n,
Line: lineNum}
n.Nodes = append(n.Nodes, node)
}
if split != -1 {
node.add(name[split+1:], value, lineNum)
} else {
node.Nodes = append(node.Nodes, &Value{Value: value, Line: lineNum})
}
}
// checkUsage checks if all conf nodes were recognized.
// This is done by recursively checking 'used' flag for all nodes.
func (n *Node) checkUsage() (err error) {
for _, v := range n.Nodes {
if child, ok := v.(*Node); ok {
if !child.used {
return child.newError("unknown parameter")
}
if err = child.checkUsage(); err != nil {
return
}
}
}
return
}
// markUsed marks node and its children as used
func (n *Node) markUsed(used bool) {
n.used = used
for _, v := range n.Nodes {
if child, ok := v.(*Node); ok {
child.markUsed(used)
}
}
}
// getValue returns node value or meta data default value or nil if
// metadata 'optional' tag is set. Otherwise error is returned.
func (n *Node) getValue(meta *Meta) (value *string, err error) {
if n != nil {
var tmp string
for _, v := range n.Nodes {
if val, ok := v.(*Value); ok {
tmp = string(val.Value)
}
value = &tmp
}
}
if value == nil && meta != nil {
if meta.defaultValue != nil {
value = meta.defaultValue
} else if meta.optional {
return
} else {
return nil, fmt.Errorf("cannot find mandatory parameter %s", meta.name)
}
}
return
}
// newNodeError creates error based on the specified node. The error message will
// have full node name (parameter name up to the node, including it) and the line
// number where parameter was defined.
func (n *Node) newError(format string, a ...interface{}) (err error) {
if n == nil {
return fmt.Errorf(format, a...)
}
var name string
for parent := n; parent.parent != nil; parent = parent.parent {
if name == "" {
name = parent.Name
} else {
name = parent.Name + "." + name
}
}
desc := fmt.Sprintf(format, a...)
return fmt.Errorf("invalid parameter %s at line %d: %s", name, n.Line, desc)
}
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