daml-on-fabric | Enabling DAML applications to run on Hyperledger Fabric | Blockchain library
kandi X-RAY | daml-on-fabric Summary
kandi X-RAY | daml-on-fabric Summary
Ledger implementation enabling DAML applications to run on Hyperledger Fabric 2.x.
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Top functions reviewed by kandi - BETA
- Init network configuration
- Get local user
- Creates the properties
- Runs the chaincode
- Convert a yaml policy file to byte array
- Parse identities from identity map
- Parse the endorsement policy from the document
- Returns the current time in milliseconds
- Given a chaincode response return an error string
- Query chaincode
- Get the list of package names
- Query the byte array for package list
- Gets the package
- Gunzip the given data
- Returns the Ledger ID for this application
- Query a system chaincode
- Writes the given commit log
- Gets the ledger ID for this context
- Returns the height of the commit block
- Reads the commit
- Returns the value associated with the specified key
daml-on-fabric Key Features
daml-on-fabric Examples and Code Snippets
Community Discussions
Trending Discussions on daml-on-fabric
QUESTION
I was reading this documentation https://github.com/digital-asset/daml-on-fabric but I am confused. I am trying to understand the workflow and the architecture for the daml on fabric network. The network has 2 orgs and each org has 1 peer.On step 4 are allocating 5 daml parties. Quickstart example has 3 signatories(issuer,owner,buyer). To sum up, what is the match between daml parties and fabric orgs? I think that could be allocated even more daml parties without to change fabric network. They interact from one node? What is the purpose to add other nodes on step 11?
...ANSWER
Answered 2020-Sep-09 at 09:20Parties don't have a cryptographic identity in DAML Ledgers, only nodes do. As part of the shared ledger state, every DAML-enabled infrastructure maintains a mapping from Party to Node. This relationship is usually described as a Node "hosting" a Party. The Node hosting a Party is able to submit transactions using that Party's authority and is guaranteed to receive any transactions visible to that Party.
In the tutorial you are referring to, all parties are allocated on a single Node, which then hosts them. This does indeed not make that much sense in practice. It would be more sensible to set up a network with three orgs and allocate the three parties on the peer nodes in the three orgs, respectively. Given the way the example is set up, that should be straightforward.
QUESTION
I deployed quickstart tutorial based on the example "daml-on-fabric" https://github.com/hacera/daml-on-fabric and after that i tried to deploy the pingpong example from dazl https://github.com/digital-asset/dazl-client/tree/master/samples/ping-pong. The bots from the example works fine on daml ledger. However, when i try to deploy this example on fabric the bots are unable to send the transactions. Everything works fine based on this read me from https://github.com/hacera/daml-on-fabric/blob/master/README.md. The smart contract look like to be deployed on Fabric. The error is when i try to use the bots from pingpong python files https://github.com/digital-asset/dazl-client/blob/master/samples/ping-pong/README.md
...ANSWER
Answered 2020-Mar-11 at 00:11From the error message it looks like the parties defined in the quick start example have not been allocated on the ledger, hence the "Party not known on ledger" error.
You can follow the steps in https://docs.daml.com/deploy/index.html with use of daml deploy --host= --port=, which will both upload the dars and allocate the parties on the ledger.
You can also run just the allocate party command daml ledger allocate-parties, which will allocate based on the parties defined you your daml.yaml.
QUESTION
I am using DAML-on-Fabric (running DAML based on Hyperledger Fabric).
When I login with Alice and issue a IOU, the app shows PartyNotKnownOnLedger (Party not known on ledger).
How do I fix this?
...ANSWER
Answered 2020-Feb-20 at 18:00As of DAML 0.13.52, the sandbox shipped in the SDK implicitly "allocates" parties for you. This is usually not the case when using actual distributed ledgers (such as Hyperledger Fabric).
To allocate the party, you can either use the SDK assistant daml ledger allocate-parties command or apply the allocateParty function using DAML script (documentation here).
Alternatively, apps from other languages can use the AllocateParty RPC in the PartyManagementService in the Ledger API. The Ledger API has available bindings in Java and Scala; there is no available wrapper for the PartyManagementService but you can use the raw gRPC-generated code to use them (more on the Ledger API here).
Since the Ledger API is defined with gRPC you can use any other language with gRPC support (more on the topic here).
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install daml-on-fabric
You can use daml-on-fabric like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the daml-on-fabric component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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