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// The opentracing package provides tracing functionality using OpenTracing.
package opentracing
import (
"context"
"fmt"
"github.com/graph-gophers/graphql-go/errors"
"github.com/graph-gophers/graphql-go/introspection"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
)
// Tracer implements the graphql-go Tracer interface and creates OpenTracing spans.
type Tracer struct{}
func (Tracer) TraceQuery(ctx context.Context, queryString string, operationName string, variables map[string]interface{}, varTypes map[string]*introspection.Type) (context.Context, func([]*errors.QueryError)) {
span, spanCtx := opentracing.StartSpanFromContext(ctx, "GraphQL request")
span.SetTag("graphql.query", queryString)
if operationName != "" {
span.SetTag("graphql.operationName", operationName)
}
if len(variables) != 0 {
span.LogFields(log.Object("graphql.variables", variables))
}
return spanCtx, func(errs []*errors.QueryError) {
if len(errs) > 0 {
msg := errs[0].Error()
if len(errs) > 1 {
msg += fmt.Sprintf(" (and %d more errors)", len(errs)-1)
}
ext.Error.Set(span, true)
span.SetTag("graphql.error", msg)
}
span.Finish()
}
}
func (Tracer) TraceField(ctx context.Context, label, typeName, fieldName string, trivial bool, args map[string]interface{}) (context.Context, func(*errors.QueryError)) {
if trivial {
return ctx, noop
}
span, spanCtx := opentracing.StartSpanFromContext(ctx, label)
span.SetTag("graphql.type", typeName)
span.SetTag("graphql.field", fieldName)
for name, value := range args {
span.SetTag("graphql.args."+name, value)
}
return spanCtx, func(err *errors.QueryError) {
if err != nil {
ext.Error.Set(span, true)
span.SetTag("graphql.error", err.Error())
}
span.Finish()
}
}
func (Tracer) TraceValidation(ctx context.Context) func([]*errors.QueryError) {
span, _ := opentracing.StartSpanFromContext(ctx, "Validate Query")
return func(errs []*errors.QueryError) {
if len(errs) > 0 {
msg := errs[0].Error()
if len(errs) > 1 {
msg += fmt.Sprintf(" (and %d more errors)", len(errs)-1)
}
ext.Error.Set(span, true)
span.SetTag("graphql.error", msg)
}
span.Finish()
}
}
func noop(*errors.QueryError) {}
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