forked from DataDog/dd-trace-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
conn.go
178 lines (161 loc) · 5.13 KB
/
conn.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016-2019 Datadog, Inc.
package sql // import "gopkg.in/DataDog/dd-trace-go.v1/contrib/database/sql"
import (
"context"
"database/sql/driver"
"fmt"
"math"
"time"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
var _ driver.Conn = (*tracedConn)(nil)
type tracedConn struct {
driver.Conn
*traceParams
}
func (tc *tracedConn) BeginTx(ctx context.Context, opts driver.TxOptions) (tx driver.Tx, err error) {
start := time.Now()
if connBeginTx, ok := tc.Conn.(driver.ConnBeginTx); ok {
tx, err = connBeginTx.BeginTx(ctx, opts)
tc.tryTrace(ctx, "Begin", "", start, err)
if err != nil {
return nil, err
}
return &tracedTx{tx, tc.traceParams, ctx}, nil
}
tx, err = tc.Conn.Begin()
tc.tryTrace(ctx, "Begin", "", start, err)
if err != nil {
return nil, err
}
return &tracedTx{tx, tc.traceParams, ctx}, nil
}
func (tc *tracedConn) PrepareContext(ctx context.Context, query string) (stmt driver.Stmt, err error) {
start := time.Now()
if connPrepareCtx, ok := tc.Conn.(driver.ConnPrepareContext); ok {
stmt, err := connPrepareCtx.PrepareContext(ctx, query)
tc.tryTrace(ctx, "Prepare", query, start, err)
if err != nil {
return nil, err
}
return &tracedStmt{stmt, tc.traceParams, ctx, query}, nil
}
stmt, err = tc.Prepare(query)
tc.tryTrace(ctx, "Prepare", query, start, err)
if err != nil {
return nil, err
}
return &tracedStmt{stmt, tc.traceParams, ctx, query}, nil
}
func (tc *tracedConn) Exec(query string, args []driver.Value) (driver.Result, error) {
if execer, ok := tc.Conn.(driver.Execer); ok {
return execer.Exec(query, args)
}
return nil, driver.ErrSkip
}
func (tc *tracedConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (r driver.Result, err error) {
start := time.Now()
if execContext, ok := tc.Conn.(driver.ExecerContext); ok {
r, err := execContext.ExecContext(ctx, query, args)
tc.tryTrace(ctx, "Exec", query, start, err)
return r, err
}
dargs, err := namedValueToValue(args)
if err != nil {
return nil, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
r, err = tc.Exec(query, dargs)
tc.tryTrace(ctx, "Exec", query, start, err)
return r, err
}
// tracedConn has a Ping method in order to implement the pinger interface
func (tc *tracedConn) Ping(ctx context.Context) (err error) {
start := time.Now()
if pinger, ok := tc.Conn.(driver.Pinger); ok {
err = pinger.Ping(ctx)
}
tc.tryTrace(ctx, "Ping", "", start, err)
return err
}
func (tc *tracedConn) Query(query string, args []driver.Value) (driver.Rows, error) {
if queryer, ok := tc.Conn.(driver.Queryer); ok {
return queryer.Query(query, args)
}
return nil, driver.ErrSkip
}
func (tc *tracedConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (rows driver.Rows, err error) {
start := time.Now()
if queryerContext, ok := tc.Conn.(driver.QueryerContext); ok {
rows, err := queryerContext.QueryContext(ctx, query, args)
tc.tryTrace(ctx, "Query", query, start, err)
return rows, err
}
dargs, err := namedValueToValue(args)
if err != nil {
return nil, err
}
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
rows, err = tc.Query(query, dargs)
tc.tryTrace(ctx, "Query", query, start, err)
return rows, err
}
// traceParams stores all information related to tracing the driver.Conn
type traceParams struct {
cfg *config
driverName string
meta map[string]string
}
type contextKey int
const spanTagsKey contextKey = 0 // map[string]string
// WithSpanTags creates a new context containing the given set of tags. They will be added
// to any query created with the returned context.
func WithSpanTags(ctx context.Context, tags map[string]string) context.Context {
return context.WithValue(ctx, spanTagsKey, tags)
}
// tryTrace will create a span using the given arguments, but will act as a no-op when err is driver.ErrSkip.
func (tp *traceParams) tryTrace(ctx context.Context, resource string, query string, startTime time.Time, err error) {
if err == driver.ErrSkip {
// Not a user error: driver is telling sql package that an
// optional interface method is not implemented. There is
// nothing to trace here.
// See: https://github.com/DataDog/dd-trace-go/issues/270
return
}
name := fmt.Sprintf("%s.query", tp.driverName)
opts := []ddtrace.StartSpanOption{
tracer.ServiceName(tp.cfg.serviceName),
tracer.SpanType(ext.SpanTypeSQL),
tracer.StartTime(startTime),
}
if !math.IsNaN(tp.cfg.analyticsRate) {
opts = append(opts, tracer.Tag(ext.EventSampleRate, tp.cfg.analyticsRate))
}
span, _ := tracer.StartSpanFromContext(ctx, name, opts...)
if query != "" {
resource = query
}
span.SetTag(ext.ResourceName, resource)
for k, v := range tp.meta {
span.SetTag(k, v)
}
if meta, ok := ctx.Value(spanTagsKey).(map[string]string); ok {
for k, v := range meta {
span.SetTag(k, v)
}
}
span.Finish(tracer.WithError(err))
}