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tracing.go
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package tracing
import (
"database/sql"
"database/sql/driver"
"fmt"
"io"
"regexp"
"strings"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
"go.opentelemetry.io/otel/trace"
"gorm.io/gorm"
"gorm.io/plugin/opentelemetry/metrics"
)
var (
firstWordRegex = regexp.MustCompile(`^\w+`)
cCommentRegex = regexp.MustCompile(`(?is)/\*.*?\*/`)
lineCommentRegex = regexp.MustCompile(`(?im)(?:--|#).*?$`)
sqlPrefixRegex = regexp.MustCompile(`^[\s;]*`)
dbRowsAffected = attribute.Key("db.rows_affected")
)
type otelPlugin struct {
provider trace.TracerProvider
tracer trace.Tracer
attrs []attribute.KeyValue
excludeQueryVars bool
excludeMetrics bool
queryFormatter func(query string) string
}
func NewPlugin(opts ...Option) gorm.Plugin {
p := &otelPlugin{}
for _, opt := range opts {
opt(p)
}
if p.provider == nil {
p.provider = otel.GetTracerProvider()
}
p.tracer = p.provider.Tracer("gorm.io/plugin/opentelemetry")
return p
}
func (p otelPlugin) Name() string {
return "otelgorm"
}
type gormHookFunc func(tx *gorm.DB)
type gormRegister interface {
Register(name string, fn func(*gorm.DB)) error
}
func (p otelPlugin) Initialize(db *gorm.DB) (err error) {
if !p.excludeMetrics {
if sqlDB, err := db.DB(); err == nil {
metrics.ReportDBStatsMetrics(sqlDB)
}
}
cb := db.Callback()
hooks := []struct {
callback gormRegister
hook gormHookFunc
name string
}{
{cb.Create().Before("gorm:create"), p.before("gorm.Create"), "before:create"},
{cb.Create().After("gorm:create"), p.after(), "after:create"},
{cb.Query().Before("gorm:query"), p.before("gorm.Query"), "before:select"},
{cb.Query().After("gorm:query"), p.after(), "after:select"},
{cb.Delete().Before("gorm:delete"), p.before("gorm.Delete"), "before:delete"},
{cb.Delete().After("gorm:delete"), p.after(), "after:delete"},
{cb.Update().Before("gorm:update"), p.before("gorm.Update"), "before:update"},
{cb.Update().After("gorm:update"), p.after(), "after:update"},
{cb.Row().Before("gorm:row"), p.before("gorm.Row"), "before:row"},
{cb.Row().After("gorm:row"), p.after(), "after:row"},
{cb.Raw().Before("gorm:raw"), p.before("gorm.Raw"), "before:raw"},
{cb.Raw().After("gorm:raw"), p.after(), "after:raw"},
}
var firstErr error
for _, h := range hooks {
if err := h.callback.Register("otel:"+h.name, h.hook); err != nil && firstErr == nil {
firstErr = fmt.Errorf("callback register %s failed: %w", h.name, err)
}
}
return firstErr
}
func (p *otelPlugin) before(spanName string) gormHookFunc {
return func(tx *gorm.DB) {
tx.Statement.Context, _ = p.tracer.Start(tx.Statement.Context, spanName, trace.WithSpanKind(trace.SpanKindClient))
}
}
func (p *otelPlugin) after() gormHookFunc {
return func(tx *gorm.DB) {
span := trace.SpanFromContext(tx.Statement.Context)
if !span.IsRecording() {
return
}
defer span.End()
attrs := make([]attribute.KeyValue, 0, len(p.attrs)+4)
attrs = append(attrs, p.attrs...)
if sys := dbSystem(tx); sys.Valid() {
attrs = append(attrs, sys)
}
vars := tx.Statement.Vars
var query string
if p.excludeQueryVars {
query = tx.Statement.SQL.String()
} else {
query = tx.Dialector.Explain(tx.Statement.SQL.String(), vars...)
}
formatQuery := p.formatQuery(query)
attrs = append(attrs, semconv.DBStatementKey.String(formatQuery))
attrs = append(attrs, semconv.DBOperationKey.String(dbOperation(formatQuery)))
if tx.Statement.Table != "" {
attrs = append(attrs, semconv.DBSQLTableKey.String(tx.Statement.Table))
}
if tx.Statement.RowsAffected != -1 {
attrs = append(attrs, dbRowsAffected.Int64(tx.Statement.RowsAffected))
}
span.SetAttributes(attrs...)
switch tx.Error {
case nil,
gorm.ErrRecordNotFound,
driver.ErrSkip,
io.EOF, // end of rows iterator
sql.ErrNoRows:
// ignore
default:
span.RecordError(tx.Error)
span.SetStatus(codes.Error, tx.Error.Error())
}
}
}
func (p *otelPlugin) formatQuery(query string) string {
if p.queryFormatter != nil {
return p.queryFormatter(query)
}
return query
}
func dbSystem(tx *gorm.DB) attribute.KeyValue {
switch tx.Dialector.Name() {
case "mysql":
return semconv.DBSystemMySQL
case "mssql":
return semconv.DBSystemMSSQL
case "postgres", "postgresql":
return semconv.DBSystemPostgreSQL
case "sqlite":
return semconv.DBSystemSqlite
case "sqlserver":
return semconv.DBSystemKey.String("sqlserver")
case "clickhouse":
return semconv.DBSystemKey.String("clickhouse")
case "spanner":
return semconv.DBSystemKey.String("spanner")
default:
return attribute.KeyValue{}
}
}
func dbOperation(query string) string {
s := cCommentRegex.ReplaceAllString(query, "")
s = lineCommentRegex.ReplaceAllString(s, "")
s = sqlPrefixRegex.ReplaceAllString(s, "")
return strings.ToLower(firstWordRegex.FindString(s))
}