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record.go
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record.go
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package main
import (
"context"
"encoding/json"
"fmt"
"io"
"net"
"os"
"strings"
"sync"
"time"
"go.atomizer.io/stream"
)
func NewMatcher(
ctx context.Context,
logger Logger,
records ...*Record,
) (*Matcher, error) {
err := checkNil(ctx, logger)
if err != nil {
return nil, err
}
// TODO: Add future support for specific record types
regex := []*Record{}
directs := map[string]*Record{}
for _, r := range records {
switch r.Type {
case REGEX, WILDCARD:
regex = append(regex, r)
case DIRECT:
directs[r.Pattern] = r
}
}
var regexMatcher *Regex
if len(regex) > 0 {
regexMatcher, err = Match(ctx, logger, regex...)
if err != nil {
return nil, err
}
}
return &Matcher{
ctx: ctx,
logger: logger,
records: directs,
regex: regexMatcher,
}, nil
}
type Matcher struct {
ctx context.Context
logger Logger
records map[string]*Record
recordsMu sync.RWMutex
regex *Regex
}
func (m *Matcher) Add(r *Record) {
m.recordsMu.Lock()
m.records[r.Pattern] = r
m.recordsMu.Unlock()
}
func (m *Matcher) Match(ctx context.Context, domain string) *Record {
if m.records == nil {
return nil
}
m.recordsMu.RLock()
r, ok := m.records[domain]
m.recordsMu.RUnlock()
if ok {
return r
}
if m.regex != nil {
select {
case <-ctx.Done():
// TODO: Add configurable timeout
case r, ok = <-m.regex.Match(ctx, domain, time.Second):
if ok {
return r
}
}
}
return nil
}
// Record defines the void-specific struct for a DNS record
// indicating the type as well as category, etc...
type Record struct {
Pattern string
Type Type
IP net.IP
Category string
Tags []string
Source string
Comment string
}
func (r *Record) String() string {
comment := ""
if r.Comment != "" {
comment = fmt.Sprintf(" | comment (%s)", r.Comment)
}
return fmt.Sprintf(
"src: %s | cat: %s | %s: %s | ip: %s | tags [%s]%s",
r.Source,
r.Category,
r.Type,
r.Pattern,
r.IP,
strings.Join(r.Tags, ","),
comment,
)
}
// MarshalJSON implements the json.Marshaler interface.
func (r *Record) MarshalJSON() ([]byte, error) {
d := struct {
Domain string `json:"domain"`
Type string `json:"type,omitempty"`
IP string `json:"ip,omitempty"`
Category string `json:"category,omitempty"`
Tags []string `json:"tags,omitempty"`
Source string `json:"source,omitempty"`
Comment string `json:"comment,omitempty"`
}{
Domain: r.Pattern,
Type: r.Type.String(),
IP: r.IP.String(),
Category: r.Category,
Tags: r.Tags,
Source: r.Source,
Comment: r.Comment,
}
return json.Marshal(d)
}
// UnmarshalJSON implements the json.Unmarshaler interface.
func (r *Record) UnmarshalJSON(data []byte) error {
d := struct {
Domain string `json:"domain"`
Type string `json:"type"`
IP string `json:"ip"`
Category string `json:"category"`
Tags []string `json:"tags"`
Source string `json:"source"`
Comment string `json:"comment"`
}{}
if err := json.Unmarshal(data, &d); err != nil {
return err
}
r.Pattern = d.Domain
r.Type = Type(d.Type)
r.IP = net.ParseIP(d.IP)
r.Category = d.Category
r.Tags = d.Tags
r.Source = d.Source
r.Comment = d.Comment
return nil
}
// Records reads files from the provided list of directories
// and returns a slice of records.
func Records(
ctx context.Context,
logger Logger,
paths ...string,
) []Record {
var records []Record
files := make(chan string)
for _, path := range paths {
go stream.Pipe(
ctx,
ReadDirectory(ctx, logger, path),
files,
)
}
bodies := ReadFiles(ctx, logger, files)
for body := range bodies {
data, err := io.ReadAll(body)
body.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
continue
}
var record Record
if err := json.Unmarshal(data, &record); err != nil {
fmt.Fprintf(os.Stderr, "error: %s\n", err)
continue
}
records = append(records, record)
}
return records
}