github.com/braveheart12/just@v0.8.7/ledger/artifactmanager/artifactmanager_senders.go (about)

     1  /*
     2   *    Copyright 2019 Insolar Technologies
     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  
    17  package artifactmanager
    18  
    19  import (
    20  	"context"
    21  	"sync"
    22  
    23  	"github.com/insolar/insolar/core"
    24  	"github.com/insolar/insolar/core/message"
    25  	"github.com/insolar/insolar/core/reply"
    26  	"github.com/insolar/insolar/instrumentation/inslogger"
    27  	"github.com/insolar/insolar/ledger/storage"
    28  	"github.com/pkg/errors"
    29  	"go.opencensus.io/stats"
    30  )
    31  
    32  // ledgerArtifactSenders is a some kind of a middleware layer
    33  // it contains cache meta-data for calls
    34  type ledgerArtifactSenders struct {
    35  	cacheLock sync.Mutex
    36  	caches    map[string]*cacheEntry
    37  }
    38  
    39  type cacheEntry struct {
    40  	sync.Mutex
    41  	reply core.Reply
    42  }
    43  
    44  func newLedgerArtifactSenders() *ledgerArtifactSenders {
    45  	return &ledgerArtifactSenders{
    46  		caches: map[string]*cacheEntry{},
    47  	}
    48  }
    49  
    50  // cachedSender is using for caching replies
    51  func (m *ledgerArtifactSenders) cachedSender(scheme core.PlatformCryptographyScheme) PreSender {
    52  	return func(sender Sender) Sender {
    53  		return func(ctx context.Context, msg core.Message, options *core.MessageSendOptions) (core.Reply, error) {
    54  
    55  			msgHash := string(scheme.IntegrityHasher().Hash(message.ToBytes(msg)))
    56  
    57  			m.cacheLock.Lock()
    58  			entry, ok := m.caches[msgHash]
    59  			if !ok {
    60  				entry = &cacheEntry{}
    61  				m.caches[msgHash] = entry
    62  			}
    63  			m.cacheLock.Unlock()
    64  
    65  			entry.Lock()
    66  			defer entry.Unlock()
    67  
    68  			if entry.reply != nil {
    69  				return entry.reply, nil
    70  			}
    71  
    72  			response, err := sender(ctx, msg, options)
    73  			if err != nil {
    74  				return nil, err
    75  			}
    76  
    77  			entry.reply = response
    78  			return response, err
    79  		}
    80  	}
    81  }
    82  
    83  // followRedirectSender is using for redirecting responses with delegation token
    84  func followRedirectSender(bus core.MessageBus) PreSender {
    85  	return func(sender Sender) Sender {
    86  		return func(ctx context.Context, msg core.Message, options *core.MessageSendOptions) (core.Reply, error) {
    87  			rep, err := sender(ctx, msg, options)
    88  			if err != nil {
    89  				return nil, err
    90  			}
    91  
    92  			if r, ok := rep.(core.RedirectReply); ok {
    93  				stats.Record(ctx, statRedirects.M(1))
    94  
    95  				redirected := r.Redirected(msg)
    96  				inslogger.FromContext(ctx).Debugf("redirect reciever=%v", r.GetReceiver())
    97  
    98  				rep, err = bus.Send(ctx, redirected, &core.MessageSendOptions{
    99  					Token:    r.GetToken(),
   100  					Receiver: r.GetReceiver(),
   101  				})
   102  				if err != nil {
   103  					return nil, err
   104  				}
   105  				if _, ok := rep.(core.RedirectReply); ok {
   106  					return nil, errors.New("double redirects are forbidden")
   107  				}
   108  				return rep, nil
   109  			}
   110  
   111  			return rep, err
   112  		}
   113  	}
   114  }
   115  
   116  // retryJetSender is using for refreshing jet-tree, if destination has no idea about a jet from message
   117  func retryJetSender(jetStorage storage.JetStorage) PreSender {
   118  	return func(sender Sender) Sender {
   119  		return func(ctx context.Context, msg core.Message, options *core.MessageSendOptions) (core.Reply, error) {
   120  			retries := jetMissRetryCount
   121  			for retries > 0 {
   122  				rep, err := sender(ctx, msg, options)
   123  				if err != nil {
   124  					return nil, err
   125  				}
   126  
   127  				if r, ok := rep.(*reply.JetMiss); ok {
   128  
   129  					jetStorage.UpdateJetTree(ctx, r.Pulse, true, r.JetID)
   130  				} else {
   131  					return rep, err
   132  				}
   133  
   134  				retries--
   135  			}
   136  
   137  			return nil, errors.New("failed to find jet (retry limit exceeded on client)")
   138  		}
   139  	}
   140  }