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converter.go
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/
converter.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbmodel
import (
"errors"
"github.com/jaegertracing/jaeger/model"
)
// ErrUnknownKeyValueTypeFromCassandra is an error that occurs when trying to decipher an unknown tag type from the database
var ErrUnknownKeyValueTypeFromCassandra = errors.New("Unknown tag type found in Cassandra")
// FromDomain converts a domain model.Span to a database Span
func FromDomain(span *model.Span) *Span {
return converter{}.fromDomain(span)
}
// ToDomain converts a database Span to a domain model.Span
func ToDomain(dbSpan *Span) (*model.Span, error) {
return converter{}.toDomain(dbSpan)
}
// converter converts Spans between domain and database representations.
// It primarily exists to namespace the conversion functions.
type converter struct{}
func (c converter) fromDomain(span *model.Span) *Span {
tags := c.toDBTags(span.Tags)
logs := c.toDBLogs(span.Logs)
refs := c.toDBRefs(span.References)
udtProcess := c.toDBProcess(span.Process)
spanHash, _ := model.HashCode(span)
return &Span{
TraceID: TraceIDFromDomain(span.TraceID),
SpanID: int64(span.SpanID),
OperationName: span.OperationName,
Flags: int32(span.Flags),
StartTime: int64(model.TimeAsEpochMicroseconds(span.StartTime)),
Duration: int64(model.DurationAsMicroseconds(span.Duration)),
Tags: tags,
Logs: logs,
Refs: refs,
Process: udtProcess,
ServiceName: span.Process.ServiceName,
SpanHash: int64(spanHash),
}
}
func (c converter) toDomain(dbSpan *Span) (*model.Span, error) {
tags, err := c.fromDBTags(dbSpan.Tags)
if err != nil {
return nil, err
}
logs, err := c.fromDBLogs(dbSpan.Logs)
if err != nil {
return nil, err
}
refs, err := c.fromDBRefs(dbSpan.Refs)
if err != nil {
return nil, err
}
process, err := c.fromDBProcess(dbSpan.Process)
if err != nil {
return nil, err
}
traceID := dbSpan.TraceID.ToDomain()
span := &model.Span{
TraceID: traceID,
SpanID: model.SpanID(dbSpan.SpanID),
OperationName: dbSpan.OperationName,
References: model.MaybeAddParentSpanID(traceID, model.SpanID(dbSpan.ParentID), refs),
Flags: model.Flags(uint32(dbSpan.Flags)),
StartTime: model.EpochMicrosecondsAsTime(uint64(dbSpan.StartTime)),
Duration: model.MicrosecondsAsDuration(uint64(dbSpan.Duration)),
Tags: tags,
Logs: logs,
Process: process,
}
return span, nil
}
func (c converter) fromDBTags(tags []KeyValue) ([]model.KeyValue, error) {
retMe := make([]model.KeyValue, len(tags))
for i := range tags {
kv, err := c.fromDBTag(&tags[i])
if err != nil {
return nil, err
}
retMe[i] = kv
}
return retMe, nil
}
func (c converter) fromDBTag(tag *KeyValue) (model.KeyValue, error) {
vType, err := model.ValueTypeFromString(tag.ValueType)
if err != nil {
return model.KeyValue{}, err
}
return c.fromDBTagOfType(tag, vType)
}
func (c converter) fromDBTagOfType(tag *KeyValue, vType model.ValueType) (model.KeyValue, error) {
switch vType {
case model.StringType:
return model.String(tag.Key, tag.ValueString), nil
case model.BoolType:
return model.Bool(tag.Key, tag.ValueBool), nil
case model.Int64Type:
return model.Int64(tag.Key, tag.ValueInt64), nil
case model.Float64Type:
return model.Float64(tag.Key, tag.ValueFloat64), nil
case model.BinaryType:
return model.Binary(tag.Key, tag.ValueBinary), nil
}
return model.KeyValue{}, ErrUnknownKeyValueTypeFromCassandra
}
func (c converter) fromDBLogs(logs []Log) ([]model.Log, error) {
retMe := make([]model.Log, len(logs))
for i, l := range logs {
fields, err := c.fromDBTags(l.Fields)
if err != nil {
return nil, err
}
retMe[i] = model.Log{
Timestamp: model.EpochMicrosecondsAsTime(uint64(l.Timestamp)),
Fields: fields,
}
}
return retMe, nil
}
func (c converter) fromDBRefs(refs []SpanRef) ([]model.SpanRef, error) {
retMe := make([]model.SpanRef, len(refs))
for i, r := range refs {
refType, err := model.SpanRefTypeFromString(r.RefType)
if err != nil {
return nil, err
}
retMe[i] = model.SpanRef{
RefType: refType,
TraceID: r.TraceID.ToDomain(),
SpanID: model.SpanID(r.SpanID),
}
}
return retMe, nil
}
func (c converter) fromDBProcess(process Process) (*model.Process, error) {
tags, err := c.fromDBTags(process.Tags)
if err != nil {
return nil, err
}
return &model.Process{
Tags: tags,
ServiceName: process.ServiceName,
}, nil
}
func (c converter) toDBTags(tags []model.KeyValue) []KeyValue {
retMe := make([]KeyValue, len(tags))
for i, t := range tags {
// do we want to validate a jaeger tag here? Making sure that the type and value matches up?
retMe[i] = KeyValue{
Key: t.Key,
ValueType: t.VType.String(),
ValueString: t.VStr,
ValueBool: t.Bool(),
ValueInt64: t.Int64(),
ValueFloat64: t.Float64(),
ValueBinary: t.Binary(),
}
}
return retMe
}
func (c converter) toDBLogs(logs []model.Log) []Log {
retMe := make([]Log, len(logs))
for i, l := range logs {
retMe[i] = Log{
Timestamp: int64(model.TimeAsEpochMicroseconds(l.Timestamp)),
Fields: c.toDBTags(l.Fields),
}
}
return retMe
}
func (c converter) toDBRefs(refs []model.SpanRef) []SpanRef {
retMe := make([]SpanRef, len(refs))
for i, r := range refs {
retMe[i] = SpanRef{
TraceID: TraceIDFromDomain(r.TraceID),
SpanID: int64(r.SpanID),
RefType: r.RefType.String(),
}
}
return retMe
}
func (c converter) toDBProcess(process *model.Process) Process {
return Process{
ServiceName: process.ServiceName,
Tags: c.toDBTags(process.Tags),
}
}