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141 lines
3.0 KiB
141 lines
3.0 KiB
package trace
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import (
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"fmt"
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"time"
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protogen "github.com/bilibili/kratos/pkg/net/trace/proto"
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)
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const (
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_maxChilds = 1024
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_maxTags = 128
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_maxLogs = 256
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)
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var _ Trace = &Span{}
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// Span is a trace span.
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type Span struct {
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dapper *dapper
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context spanContext
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operationName string
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startTime time.Time
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duration time.Duration
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tags []Tag
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logs []*protogen.Log
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childs int
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}
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func (s *Span) ServiceName() string {
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return s.dapper.serviceName
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}
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func (s *Span) OperationName() string {
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return s.operationName
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}
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func (s *Span) StartTime() time.Time {
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return s.startTime
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}
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func (s *Span) Duration() time.Duration {
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return s.duration
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}
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func (s *Span) TraceID() string {
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return s.context.String()
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}
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func (s *Span) Context() spanContext {
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return s.context
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}
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func (s *Span) Tags() []Tag {
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return s.tags
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}
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func (s *Span) Logs() []*protogen.Log {
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return s.logs
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}
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func (s *Span) Fork(serviceName, operationName string) Trace {
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if s.childs > _maxChilds {
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// if child span more than max childs set return noopspan
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return noopspan{}
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}
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s.childs++
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// 为了兼容临时为 New 的 Span 设置 span.kind
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return s.dapper.newSpanWithContext(operationName, s.context).SetTag(TagString(TagSpanKind, "client"))
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}
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func (s *Span) Follow(serviceName, operationName string) Trace {
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return s.Fork(serviceName, operationName).SetTag(TagString(TagSpanKind, "producer"))
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}
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func (s *Span) Finish(perr *error) {
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s.duration = time.Since(s.startTime)
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if perr != nil && *perr != nil {
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err := *perr
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s.SetTag(TagBool(TagError, true))
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s.SetLog(Log(LogMessage, err.Error()))
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if err, ok := err.(stackTracer); ok {
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s.SetLog(Log(LogStack, fmt.Sprintf("%+v", err.StackTrace())))
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}
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}
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s.dapper.report(s)
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}
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func (s *Span) SetTag(tags ...Tag) Trace {
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if !s.context.isSampled() && !s.context.isDebug() {
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return s
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}
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if len(s.tags) < _maxTags {
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s.tags = append(s.tags, tags...)
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}
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if len(s.tags) == _maxTags {
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s.tags = append(s.tags, Tag{Key: "trace.error", Value: "too many tags"})
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}
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return s
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}
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// LogFields is an efficient and type-checked way to record key:value
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// NOTE current unsupport
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func (s *Span) SetLog(logs ...LogField) Trace {
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if !s.context.isSampled() && !s.context.isDebug() {
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return s
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}
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if len(s.logs) < _maxLogs {
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s.setLog(logs...)
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}
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if len(s.logs) == _maxLogs {
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s.setLog(LogField{Key: "trace.error", Value: "too many logs"})
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}
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return s
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}
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func (s *Span) setLog(logs ...LogField) Trace {
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protoLog := &protogen.Log{
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Timestamp: time.Now().UnixNano(),
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Fields: make([]*protogen.Field, len(logs)),
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}
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for i := range logs {
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protoLog.Fields[i] = &protogen.Field{Key: logs[i].Key, Value: []byte(logs[i].Value)}
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}
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s.logs = append(s.logs, protoLog)
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return s
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}
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// Visit visits the k-v pair in trace, calling fn for each.
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func (s *Span) Visit(fn func(k, v string)) {
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fn(KratosTraceID, s.context.String())
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}
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// SetTitle reset trace title
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func (s *Span) SetTitle(operationName string) {
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s.operationName = operationName
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}
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func (s *Span) String() string {
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return s.context.String()
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}
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