github.com/kchristidis/fabric@v1.0.4-0.20171028114726-837acd08cde1/bccsp/factory/factory.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  package factory
    17  
    18  import (
    19  	"fmt"
    20  	"sync"
    21  
    22  	"github.com/hyperledger/fabric/bccsp"
    23  	"github.com/hyperledger/fabric/common/flogging"
    24  )
    25  
    26  var (
    27  	// Default BCCSP
    28  	defaultBCCSP bccsp.BCCSP
    29  
    30  	// when InitFactories has not been called yet (should only happen
    31  	// in test cases), use this BCCSP temporarily
    32  	bootBCCSP bccsp.BCCSP
    33  
    34  	// BCCSP Factories
    35  	bccspMap map[string]bccsp.BCCSP
    36  
    37  	// factories' Sync on Initialization
    38  	factoriesInitOnce sync.Once
    39  	bootBCCSPInitOnce sync.Once
    40  
    41  	// Factories' Initialization Error
    42  	factoriesInitError error
    43  
    44  	logger = flogging.MustGetLogger("bccsp")
    45  )
    46  
    47  // BCCSPFactory is used to get instances of the BCCSP interface.
    48  // A Factory has name used to address it.
    49  type BCCSPFactory interface {
    50  
    51  	// Name returns the name of this factory
    52  	Name() string
    53  
    54  	// Get returns an instance of BCCSP using opts.
    55  	Get(opts *FactoryOpts) (bccsp.BCCSP, error)
    56  }
    57  
    58  // GetDefault returns a non-ephemeral (long-term) BCCSP
    59  func GetDefault() bccsp.BCCSP {
    60  	if defaultBCCSP == nil {
    61  		logger.Warning("Before using BCCSP, please call InitFactories(). Falling back to bootBCCSP.")
    62  		bootBCCSPInitOnce.Do(func() {
    63  			var err error
    64  			f := &SWFactory{}
    65  			bootBCCSP, err = f.Get(GetDefaultOpts())
    66  			if err != nil {
    67  				panic("BCCSP Internal error, failed initialization with GetDefaultOpts!")
    68  			}
    69  		})
    70  		return bootBCCSP
    71  	}
    72  	return defaultBCCSP
    73  }
    74  
    75  // GetBCCSP returns a BCCSP created according to the options passed in input.
    76  func GetBCCSP(name string) (bccsp.BCCSP, error) {
    77  	csp, ok := bccspMap[name]
    78  	if !ok {
    79  		return nil, fmt.Errorf("Could not find BCCSP, no '%s' provider", name)
    80  	}
    81  	return csp, nil
    82  }
    83  
    84  func initBCCSP(f BCCSPFactory, config *FactoryOpts) error {
    85  	csp, err := f.Get(config)
    86  	if err != nil {
    87  		return fmt.Errorf("Could not initialize BCCSP %s [%s]", f.Name(), err)
    88  	}
    89  
    90  	logger.Debugf("Initialize BCCSP [%s]", f.Name())
    91  	bccspMap[f.Name()] = csp
    92  	return nil
    93  }