2020-01-12 18:23:35 +01:00
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package resolver
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import (
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"fmt"
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"time"
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2021-08-25 22:06:34 +02:00
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"github.com/0xERR0R/blocky/config"
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2021-08-29 21:51:24 +02:00
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"github.com/0xERR0R/blocky/model"
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2021-08-30 18:11:06 +02:00
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"github.com/0xERR0R/blocky/querylog"
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2020-01-12 18:23:35 +01:00
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)
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const (
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cleanUpRunPeriod = 12 * time.Hour
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queryLoggingResolverPrefix = "query_logging_resolver"
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logChanCap = 1000
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)
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// QueryLoggingResolver writes query information (question, answer, duration, ...) into
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// log file or as log entry (if log directory is not configured)
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type QueryLoggingResolver struct {
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NextResolver
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target string
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logRetentionDays uint64
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logChan chan *querylog.Entry
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writer querylog.Writer
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2020-01-12 18:23:35 +01:00
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}
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2021-02-26 13:45:57 +01:00
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// NewQueryLoggingResolver returns a new resolver instance
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2020-01-12 18:23:35 +01:00
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func NewQueryLoggingResolver(cfg config.QueryLogConfig) ChainedResolver {
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var writer querylog.Writer
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switch cfg.Type {
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case config.QueryLogTypeCSV:
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writer = querylog.NewCSVWriter(cfg.Target, false, cfg.LogRetentionDays)
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case config.QueryLogTypeCSVPerClient:
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writer = querylog.NewCSVWriter(cfg.Target, true, cfg.LogRetentionDays)
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case config.QueryLogTypeMySQL:
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writer = querylog.NewDatabaseWriter(cfg.Target, cfg.LogRetentionDays)
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default:
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writer = querylog.NewLoggerWriter()
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2020-01-12 18:23:35 +01:00
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}
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2021-08-30 18:11:06 +02:00
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logChan := make(chan *querylog.Entry, logChanCap)
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2020-01-12 18:23:35 +01:00
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resolver := QueryLoggingResolver{
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target: cfg.Target,
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2020-01-12 18:23:35 +01:00
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logRetentionDays: cfg.LogRetentionDays,
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logChan: logChan,
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writer: writer,
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2020-01-12 18:23:35 +01:00
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}
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go resolver.writeLog()
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if cfg.LogRetentionDays > 0 {
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go resolver.periodicCleanUp()
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}
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return &resolver
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}
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// triggers periodically cleanup of old log files
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func (r *QueryLoggingResolver) periodicCleanUp() {
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ticker := time.NewTicker(cleanUpRunPeriod)
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defer ticker.Stop()
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for {
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<-ticker.C
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r.doCleanUp()
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}
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}
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func (r *QueryLoggingResolver) doCleanUp() {
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r.writer.CleanUp()
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}
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2021-02-26 13:45:57 +01:00
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// Resolve logs the query, duration and the result
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func (r *QueryLoggingResolver) Resolve(request *model.Request) (*model.Response, error) {
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logger := withPrefix(request.Log, queryLoggingResolverPrefix)
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start := time.Now()
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resp, err := r.next.Resolve(request)
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duration := time.Since(start).Milliseconds()
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if err == nil {
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select {
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case r.logChan <- &querylog.Entry{
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Request: request,
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Response: resp,
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Start: start,
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DurationMs: duration}:
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default:
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logger.Error("query log writer is too slow, log entry will be dropped")
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}
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}
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return resp, err
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}
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// write entry: if log directory is configured, write to log file
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func (r *QueryLoggingResolver) writeLog() {
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for logEntry := range r.logChan {
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start := time.Now()
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2020-01-12 18:23:35 +01:00
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r.writer.Write(logEntry)
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halfCap := cap(r.logChan) / 2
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2021-01-19 21:52:24 +01:00
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2021-08-30 18:11:06 +02:00
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// if log channel is > 50% full, this could be a problem with slow writer (external storage over network etc.)
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if len(r.logChan) > halfCap {
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logger(queryLoggingResolverPrefix).WithField("channel_len",
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len(r.logChan)).Warnf("query log writer is too slow, write duration: %d ms", time.Since(start).Milliseconds())
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}
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}
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}
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2021-02-26 13:45:57 +01:00
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// Configuration returns the current resolver configuration
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2020-01-12 18:23:35 +01:00
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func (r *QueryLoggingResolver) Configuration() (result []string) {
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if r.target != "" {
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result = append(result, fmt.Sprintf("target: \"%s\"", r.target))
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result = append(result, fmt.Sprintf("logRetentionDays: %d", r.logRetentionDays))
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2020-01-12 18:23:35 +01:00
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if r.logRetentionDays == 0 {
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result = append(result, "log cleanup deactivated")
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}
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} else {
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result = []string{"deactivated"}
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}
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return
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}
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