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typeconv.go
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typeconv.go
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// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package postgresql
import "time"
var (
minPostgreSQLDateTime = getMinPostgreSQLDateTime()
)
type (
// DataConverter defines the API for conversions to/from
// go types to mysql datatypes
DataConverter interface {
ToPostgreSQLDateTime(t time.Time) time.Time
FromPostgreSQLDateTime(t time.Time) time.Time
}
converter struct{}
)
// ToPostgreSQLDateTime converts to time to PostgreSQL datetime
func (c *converter) ToPostgreSQLDateTime(t time.Time) time.Time {
if t.IsZero() {
return minPostgreSQLDateTime
}
return t.UTC()
}
// FromPostgreSQLDateTime converts postgresql datetime and returns go time
func (c *converter) FromPostgreSQLDateTime(t time.Time) time.Time {
// NOTE: PostgreSQL will preserve the location of time in a
// weird way, here need to call UTC to remove the time location
if t.Equal(minPostgreSQLDateTime) {
return time.Time{}.UTC()
}
return t.UTC()
}
func getMinPostgreSQLDateTime() time.Time {
t, err := time.Parse(time.RFC3339, "1000-01-01T00:00:00Z")
if err != nil {
return time.Unix(0, 0).UTC()
}
return t.UTC()
}