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package graphql
import (
"context"
"encoding/json"
"fmt"
"io"
"strings"
"github.com/99designs/gqlgen/graphql"
"github.com/MichaelMure/git-bug/util/colors"
)
// adapted from https://github.com/99designs/gqlgen/blob/master/graphql/handler/debug/tracer.go
type Tracer struct {
Out io.Writer
}
var _ interface {
graphql.HandlerExtension
graphql.ResponseInterceptor
} = &Tracer{}
func (a Tracer) ExtensionName() string {
return "error tracer"
}
func (a *Tracer) Validate(schema graphql.ExecutableSchema) error {
return nil
}
func stringify(value interface{}) string {
valueJson, err := json.MarshalIndent(value, " ", " ")
if err == nil {
return string(valueJson)
}
return fmt.Sprint(value)
}
func (a Tracer) InterceptResponse(ctx context.Context, next graphql.ResponseHandler) *graphql.Response {
resp := next(ctx)
if len(resp.Errors) == 0 {
return resp
}
rctx := graphql.GetOperationContext(ctx)
_, _ = fmt.Fprintln(a.Out, "GraphQL Request {")
for _, line := range strings.Split(rctx.RawQuery, "\n") {
_, _ = fmt.Fprintln(a.Out, " ", colors.Cyan(line))
}
for name, value := range rctx.Variables {
_, _ = fmt.Fprintf(a.Out, " var %s = %s\n", name, colors.Yellow(stringify(value)))
}
_, _ = fmt.Fprintln(a.Out, " resp:", colors.Green(stringify(resp)))
for _, err := range resp.Errors {
_, _ = fmt.Fprintln(a.Out, " error:", colors.Bold(err.Path.String()+":"), colors.Red(err.Message))
}
_, _ = fmt.Fprintln(a.Out, "}")
_, _ = fmt.Fprintln(a.Out)
return resp
}
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