DPOS example #2
DPOS example #2
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| @@ -21,6 +21,10 @@ import ( | |||
| "gopkg.in/mgo.v2/bson" | |||
| ) | |||
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| const ( | |||
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Can we set it to at least 4? so that we can test out the byzantine fault tolerance. Tendermint will continue to produce blocks as long as more than 2/3 of validators are non-malicious.
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yes you are right, that was originally 4 but I've started decreasing it when I struggled to set up nodes locally.
jsonstore/jsonstore.go
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| fmt.Println("user validated!") | ||
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| // validate validator exists & update votes | ||
| validatorID := bson.ObjectIdHex(entity["validator"].(string)) |
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It is also possible to retrieve validatorID via the publicKey. This way you won't have to supply validatorID separately for voting from the front-end. Supplying just the publicKey of the person will suffice.
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nice. Didn't realise that. Make sense since NodeId is derived the same way
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i got back to this comment now and realised it doesnt work for me.. let's discuss it in the morning
jsonstore/jsonstore.go
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| // validate validator exists & update votes | ||
| validatorID := bson.ObjectIdHex(entity["validator"].(string)) | ||
| err = db.C("validators").Update(bson.M{"_id": validatorID}, bson.M{"$addToSet": bson.M{"votes": user.ID}}) | ||
| if err != nil { |
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We are doing only $addToSet here. What about the scenario when the user wants to retract the vote assigned to a particular person?
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Thought of that but I didnt implement it as I wanted to test what I had first and was struggling with that at the end.
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I've added scenario to downvote validator.
jsonstore/jsonstore.go
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| // that could be considered an issue depending on requirements | ||
| project := bson.M{ | ||
| "$project": bson.M{ | ||
| "name": 1, |
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We don't have to use aggregation if we just maintain another property called votes (integer) in the validator documents.
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good point. Could have added "increment" and new field
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added vote count as a part of adding extra collection
mint.go
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| @@ -22,14 +24,16 @@ func initJSONStore() error { | |||
| // Create the application | |||
| var app types.Application | |||
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| session, err := mgo.Dial("localhost") | |||
| fmt.Println("running aginst mongo: ", os.Getenv("MONGO_URL")) | |||
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If Mongo_URL env is not set, what does it use by default?
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it uses localhost:27017 but tbh its not obvious from the client library code... When I added it and run it just still worked which surprised me too. (unless there is another bug I missed ;) )
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so turned out i was wrong and it doesn't default to localhost:27017.. must have forgotten i've added it. This way or the other im removing it as well as removing override for the ABCI port. Since you may be merging it there is no point in me forcing code basically added for testing
jsonstore/jsonstore.go
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| ID bson.ObjectId `bson:"_id" json:"_id"` | ||
| Name string `bson:"name" json:"name"` | ||
| PublicKey []byte `bson:"publicKey" json:"publicKey"` | ||
| Votes []bson.ObjectId `bson:"votes" json:"votes"` |
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Validator documents can quickly grow in size (MongoDB documents have a 16MB size limit) if we store the ObjectIDs of voters in the same document (Votes array). There is no upper limit to the number of voters. I would suggest storing the votes count in the document itself and move the ObjectIDs of voters to a separate junction collection. This will also help us sort the validators efficiently.
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as discussed added UserValidatorVote collection
jsonstore/jsonstore.go
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| if validators != nil { | ||
| for _, element := range validators { | ||
| validator := Validator{ | ||
| ID: bson.NewObjectId(), |
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that's a bug. We cannot generate random value for each like that cos it will create different IDs on on every validator node.
…ike Address, PubKey etc., adding code for testing
adding script to trigger multiple nodes locally
…ling upgrading tendermint to have proper access to Validators attributes l…
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