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hash.go
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hash.go
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/*
Copyright © 2019 the InMAP authors.
This file is part of InMAP.
InMAP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
InMAP is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with InMAP. If not, see <http://www.gnu.org/licenses/>.*/
package hash
import (
"encoding/gob"
"fmt"
"hash/fnv"
"github.com/davecgh/go-spew/spew"
)
// Hash returns a hash key for the specified object.
func Hash(object interface{}) string {
if s, ok := object.(fmt.Stringer); ok {
return s.String()
}
h := fnv.New128a()
e := gob.NewEncoder(h)
if err := e.Encode(object); err == nil {
bKey := h.Sum([]byte{})
return fmt.Sprintf("%x", bKey[0:h.Size()])
}
// If there is an error (e.g., there are NaN values)
// use spew instead of gob.
printer := spew.ConfigState{
Indent: " ",
SortKeys: true,
DisableMethods: true,
SpewKeys: true,
DisablePointerAddresses: true,
DisableCapacities: true,
}
printer.Fprintf(h, "%#v", object)
bKey := h.Sum([]byte{})
return fmt.Sprintf("%x", bKey[0:h.Size()])
}