github.com/kaleido-io/firefly@v0.0.0-20210622132723-8b4b6aacb971/pkg/fftypes/data.go (about)

     1  // Copyright © 2021 Kaleido, Inc.
     2  //
     3  // SPDX-License-Identifier: Apache-2.0
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  package fftypes
    18  
    19  import (
    20  	"context"
    21  	"crypto/sha256"
    22  	"encoding/json"
    23  	"fmt"
    24  
    25  	"github.com/kaleido-io/firefly/internal/i18n"
    26  )
    27  
    28  type DataRef struct {
    29  	ID   *UUID    `json:"id,omitempty"`
    30  	Hash *Bytes32 `json:"hash,omitempty"`
    31  }
    32  
    33  type Data struct {
    34  	ID        *UUID         `json:"id,omitempty"`
    35  	Validator ValidatorType `json:"validator"`
    36  	Blobstore bool          `json:"blobstore,omitempty"`
    37  	Namespace string        `json:"namespace,omitempty"`
    38  	Hash      *Bytes32      `json:"hash,omitempty"`
    39  	Created   *FFTime       `json:"created,omitempty"`
    40  	Datatype  *DatatypeRef  `json:"datatype,omitempty"`
    41  	Value     Byteable      `json:"value"`
    42  }
    43  
    44  type DatatypeRef struct {
    45  	Name    string `json:"name,omitempty"`
    46  	Version string `json:"version,omitempty"`
    47  }
    48  
    49  func (dr *DatatypeRef) String() string {
    50  	if dr == nil {
    51  		return "null"
    52  	}
    53  	return fmt.Sprintf("%s/%s", dr.Name, dr.Version)
    54  }
    55  
    56  type DataRefs []*DataRef
    57  
    58  func (d DataRefs) Hash() *Bytes32 {
    59  	b, _ := json.Marshal(&d)
    60  	var b32 Bytes32 = sha256.Sum256(b)
    61  	return &b32
    62  }
    63  
    64  func (d *Data) Seal(ctx context.Context) error {
    65  	if d.Value == nil || d.Value.String() == "null" {
    66  		return i18n.NewError(ctx, i18n.MsgDataValueIsNull)
    67  	}
    68  	if d.ID == nil {
    69  		d.ID = NewUUID()
    70  	}
    71  	if d.Created == nil {
    72  		d.Created = Now()
    73  	}
    74  	d.Hash = d.Value.Hash()
    75  	return nil
    76  }