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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package ocgremlin
import (
"context"
"fmt"
"github.com/facebook/ent/dialect/gremlin"
"go.opencensus.io/trace"
)
// Attributes recorded on the span for the requests.
const (
RequestIDAttribute = "gremlin.request_id"
OperationAttribute = "gremlin.operation"
QueryAttribute = "gremlin.query"
BindingAttribute = "gremlin.binding"
CodeAttribute = "gremlin.code"
MessageAttribute = "gremlin.message"
)
type traceTransport struct {
base gremlin.RoundTripper
startOptions trace.StartOptions
formatSpanName func(context.Context, *gremlin.Request) string
withQuery bool
}
func (t *traceTransport) RoundTrip(ctx context.Context, req *gremlin.Request) (*gremlin.Response, error) {
ctx, span := trace.StartSpan(ctx,
t.formatSpanName(ctx, req),
trace.WithSampler(t.startOptions.Sampler),
trace.WithSpanKind(trace.SpanKindClient),
)
defer span.End()
span.AddAttributes(requestAttrs(req, t.withQuery)...)
rsp, err := t.base.RoundTrip(ctx, req)
if err != nil {
span.SetStatus(trace.Status{Code: trace.StatusCodeUnknown, Message: err.Error()})
return rsp, err
}
span.AddAttributes(responseAttrs(rsp)...)
span.SetStatus(TraceStatus(rsp.Status.Code))
return rsp, err
}
func requestAttrs(req *gremlin.Request, withQuery bool) []trace.Attribute {
attrs := []trace.Attribute{
trace.StringAttribute(RequestIDAttribute, req.RequestID),
trace.StringAttribute(OperationAttribute, req.Operation),
}
if withQuery {
query, _ := req.Arguments[gremlin.ArgsGremlin].(string)
attrs = append(attrs, trace.StringAttribute(QueryAttribute, query))
if bindings, ok := req.Arguments[gremlin.ArgsBindings].(map[string]interface{}); ok {
attrs = append(attrs, bindingsAttrs(bindings)...)
}
}
return attrs
}
func bindingsAttrs(bindings map[string]interface{}) []trace.Attribute {
attrs := make([]trace.Attribute, 0, len(bindings))
for key, val := range bindings {
key = BindingAttribute + "." + key
attrs = append(attrs, bindingToAttr(key, val))
}
return attrs
}
func bindingToAttr(key string, val interface{}) trace.Attribute {
switch v := val.(type) {
case nil:
return trace.StringAttribute(key, "")
case int64:
return trace.Int64Attribute(key, v)
case float64:
return trace.Float64Attribute(key, v)
case string:
return trace.StringAttribute(key, v)
case bool:
return trace.BoolAttribute(key, v)
default:
s := fmt.Sprintf("%v", v)
if len(s) > 256 {
s = s[:256]
}
return trace.StringAttribute(key, s)
}
}
func responseAttrs(rsp *gremlin.Response) []trace.Attribute {
attrs := []trace.Attribute{
trace.Int64Attribute(CodeAttribute, int64(rsp.Status.Code)),
}
if rsp.Status.Message != "" {
attrs = append(attrs, trace.StringAttribute(MessageAttribute, rsp.Status.Message))
}
return attrs
}
// TraceStatus is a utility to convert the gremlin status code to a trace.Status.
func TraceStatus(status int) trace.Status {
var code int32
switch status {
case gremlin.StatusSuccess,
gremlin.StatusNoContent,
gremlin.StatusPartialContent:
code = trace.StatusCodeOK
case gremlin.StatusUnauthorized:
code = trace.StatusCodePermissionDenied
case gremlin.StatusAuthenticate:
code = trace.StatusCodeUnauthenticated
case gremlin.StatusMalformedRequest,
gremlin.StatusInvalidRequestArguments,
gremlin.StatusScriptEvaluationError:
code = trace.StatusCodeInvalidArgument
case gremlin.StatusServerError,
gremlin.StatusServerSerializationError:
code = trace.StatusCodeInternal
case gremlin.StatusServerTimeout:
code = trace.StatusCodeDeadlineExceeded
default:
code = trace.StatusCodeUnknown
}
return trace.Status{Code: code, Message: gremlin.StatusText(status)}
}
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