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database_logger.go
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database_logger.go
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// Copyright 2021 the Exposure Notifications Verification Server authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package database
import (
"database/sql/driver"
"fmt"
"reflect"
"regexp"
"strings"
"time"
"github.com/google/exposure-notifications-verification-server/internal/project"
"go.uber.org/zap"
)
// GormZapLogger is a gorm logger than writes to a zap logger for structured
// logging.
type GormZapLogger struct {
logger *zap.SugaredLogger
spacesRe *regexp.Regexp
moduleRoot string
}
// NewGormZapLogger creates a new gorm logger.
func NewGormZapLogger(logger *zap.SugaredLogger) (*GormZapLogger, error) {
spacesRe, err := regexp.Compile(`\s+`)
if err != nil {
return nil, fmt.Errorf("failed to compile regexp: %w", err)
}
// Disable the caller injection because gorm supplies us the caller.
logger = logger.Desugar().WithOptions(zap.WithCaller(false)).Sugar()
return &GormZapLogger{
logger: logger,
spacesRe: spacesRe,
moduleRoot: project.Root() + "/",
}, nil
}
// Print satisfies gorm's interface for a logger.
func (l *GormZapLogger) Print(v ...interface{}) {
if len(v) == 0 {
return
}
if len(v) == 1 {
l.logger.DPanicf("only 1 element to Print: %#v", v)
return
}
switch v[0] {
case "info":
msg, ok := v[1].(string)
if !ok {
l.logger.DPanicf("info result is not string (%T): %#v", v[1], v)
return
}
msg = strings.TrimPrefix(msg, "[info]")
msg = strings.TrimSpace(msg)
l.logger.Debugw(msg)
case "log":
switch typ := v[2].(type) {
case string:
l.logger.Debugw(strings.TrimSpace(typ))
case error:
l.logger.Errorw(strings.TrimSpace(typ.Error()))
default:
l.logger.DPanicf("log result is not string (%T): %#v", v[2], v)
}
case "error":
caller, err := l.formatCaller(v[1])
if err != nil {
l.logger.DPanic(err)
return
}
l.logger.Errorw("gorm error",
"caller", caller,
"error", v[2])
case "sql":
caller, err := l.formatCaller(v[1])
if err != nil {
l.logger.DPanic(err)
return
}
duration, ok := v[2].(time.Duration)
if !ok {
l.logger.DPanicf("duration is not time.Duration (%T): %#v", v[2], v)
}
duration = duration * time.Nanosecond
sql, err := l.formatSQL(v[3])
if err != nil {
l.logger.DPanic(err)
return
}
values, err := l.formatValues(v[4])
if err != nil {
l.logger.DPanic(err)
return
}
rows, ok := v[5].(int64)
if !ok {
l.logger.DPanicf("rows is not int64 (%T): %#v", v[5], v)
return
}
l.logger.Debugw(sql,
"caller", caller,
"duration", duration,
"values", values,
"rows", rows)
default:
l.logger.DPanicf("unknown log type %v: %#v", v[0], v)
}
}
func (l *GormZapLogger) formatCaller(v interface{}) (string, error) {
typ, ok := v.(string)
if !ok {
return "", fmt.Errorf("formatCaller: %T is not string", v)
}
typ = strings.TrimPrefix(typ, l.moduleRoot)
return typ, nil
}
// formatSQL makes SQL pretty
func (l *GormZapLogger) formatSQL(v interface{}) (string, error) {
typ, ok := v.(string)
if !ok {
return "", fmt.Errorf("formatSQL: %T is not string", v)
}
typ = l.spacesRe.ReplaceAllString(typ, " ")
typ = strings.TrimSpace(typ)
return typ, nil
}
// formatValues makes SQL input values pretty
func (l *GormZapLogger) formatValues(v interface{}) ([]string, error) {
typ, ok := v.([]interface{})
if !ok {
return nil, fmt.Errorf("formatValues: %T is not []interface{}", v)
}
result := make([]string, 0, len(typ))
for _, v := range typ {
ind := reflect.Indirect(reflect.ValueOf(v))
if !ind.IsValid() {
result = append(result, "NULL")
continue
}
if t, ok := v.(driver.Valuer); ok {
if val, err := t.Value(); err == nil && val != nil {
result = append(result, fmt.Sprintf("'%v'", val))
} else {
result = append(result, "NULL")
}
continue
}
if t, ok := v.(time.Time); ok {
if t.IsZero() {
t = time.Unix(0, 0)
}
result = append(result, t.Format(time.RFC3339))
continue
}
result = append(result, fmt.Sprintf("%v", v))
}
return result, nil
}