Go SDK to create and interact with Mesh API implementations
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The mesh-sdk-go provides a collection of packages used for interaction with the Mesh API specification. Much of the code in this repository is generated from the mesh-specifications repository.
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If you have a blockchain based on go-ethereum, we recommend that you use our mesh-geth-sdk SDK.
This Golang project provides a server package that empowers a developer to write a full Mesh Data API server by only implementing an interface. This package automatically validates client requests and calls the functions you implement with pre-parsed requests (instead of in raw JSON).
If you plan to use a language other than Golang, you will need to either codegen a server (using Swagger Codegen or OpenAPI Generator) or write one from scratch. If you choose to write an implementation in another language, we ask that you create a separate repository in an SDK-like format for all the code you generate so that other developers can use it. You can add your repository to the list in the mesh-ecosystem repository, and in the ecosystem category of our community site. Use this repository (mesh-sdk-go) for an example of how to generate code from this specification.
This command installs the Server package.
go get github.com/coinbase/mesh-sdk-go/serverThe router is a Mux router that routes traffic to the correct controller.
Controllers are automatically generated code that specify an interface that a service must implement.
Services are implemented by you to populate responses. These services are invoked by controllers.
main.go
/services
block_service.go
network_service.go
...
This is an example of how to write an implementation using the Server package in mesh-sdk-go.
package main
import (
"fmt"
"log"
"net/http"
"github.com/coinbase/mesh-sdk-go/asserter"
"github.com/coinbase/mesh-sdk-go/examples/server/services"
"github.com/coinbase/mesh-sdk-go/server"
"github.com/coinbase/mesh-sdk-go/types"
)
const (
serverPort = 8080
)
// NewBlockchainRouter creates a Mux http.Handler from a collection
// of server controllers.
func NewBlockchainRouter(
network *types.NetworkIdentifier,
asserter *asserter.Asserter,
) http.Handler {
networkAPIService := services.NewNetworkAPIService(network)
networkAPIController := server.NewNetworkAPIController(
networkAPIService,
asserter,
)
blockAPIService := services.NewBlockAPIService(network)
blockAPIController := server.NewBlockAPIController(
blockAPIService,
asserter,
)
return server.NewRouter(networkAPIController, blockAPIController)
}
func main() {
network := &types.NetworkIdentifier{
Blockchain: "Mesh",
Network: "Testnet",
}
// The asserter automatically rejects incorrectly formatted
// requests.
asserter, err := asserter.NewServer(
[]string{"Transfer", "Reward"},
false,
[]*types.NetworkIdentifier{network},
nil,
false,
"",
)
if err != nil {
log.Fatal(err)
}
// Create the main router handler then apply the logger and Cors
// middlewares in sequence.
router := NewBlockchainRouter(network, asserter)
loggedRouter := server.LoggerMiddleware(router)
corsRouter := server.CorsMiddleware(loggedRouter)
log.Printf("Listening on port %d\n", serverPort)
log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", serverPort), corsRouter))
}- Types: Auto-generated Mesh types
- Client: Low-level communication with any Mesh server
- Server: Simplified Mesh API server development
- Asserter: Validation of Mesh types
- Fetcher: Simplified and validated communication with any Mesh server
- Parser: Tool for parsing Mesh blocks
- Syncer: Sync Mesh blocks with customizable handling
- Reconciler: Compare derived balances with node balances
- Keys: Cryptographic operations for Mesh-supported curves
- Constructor: Coordinate the construction and broadcast of transactions
These packages are demoed extensively in examples and are utilized throughout the mesh-cli tool.
The core of any integration is syncing blocks reliably. The syncer serially processes blocks from a Data API implementation (automatically handling re-orgs) with user-defined handling logic and pluggable storage. After a block is processed, store it to a DB or send a push notification—the decision is up to you!
When reading the operations in a block, it's helpful to apply higher-level groupings to related operations, or match operations in a transaction to some set of generic descriptions (i.e., ensure there are two operations of equal but opposite amounts). The parser empowers any integrator to build abstractions on top of the building blocks that the Mesh API exposes.
Helpful commands for development:
make deps
make gen
If you want to modify client and server, please modify files under templates/client and templates/server then run make gen
make test
This includes the generated code.
make lint
make release
To validate mesh-sdk-go, install mesh-cli and run one of the following commands:
mesh-cli check:data --configuration-file mesh-cli-conf/testnet/config.json- This command validates that the Data API implementation is correct, using the bitcointestnetnode. It also ensures that the implementation does not miss any balance-changing operations.mesh-cli check:construction --configuration-file mesh-cli-conf/testnet/config.json- This command validates the Construction API implementation. It also verifies transaction construction, signing, and submissions to thetestnetnetwork.mesh-cli check:data --configuration-file mesh-cli-conf/mainnet/config.json- This command validates that the Data API implementation is correct, using the bitcoinmainnetnode. It also ensures that the implementation does not miss any balance-changing operations.
Read the How to Test your Mesh Implementation documentation for additional details.
You may contribute to the mesh-sdk-go project in various ways:
Read our Contributing documentation for more information.
When you've finished an implementation for a blockchain, share your work in the ecosystem category of the community site. Platforms looking for implementations for certain blockchains will be monitoring this section of the website for high-quality implementations they can use for integration. Make sure that your implementation meets the expectations of any implementation.
You can find the Mesh API documentation at mesh-api.org.
Check out the Getting Started section to start diving into Mesh.
Our documentation is divided into the following sections:
- mesh-specifications — The
mesh-specificationsrepository generates the SDK code in themesh-sdk-gorepository. - mesh-cli — Use the
mesh-clitool to test your Mesh API implementation. The tool also provides the ability to look up block contents and account balances. - mesh-geth-sdk – The
mesh-geth-sdkrepository provides a collection of packages used for interaction with the Mesh API specification. The goal of this SDK is to help accelerate Mesh API implementation on go-ethereum based chains.
To help you with examples, we developed complete Mesh API sample implementations for Bitcoin and Ethereum. Developers of Bitcoin-like or Ethereum-like blockchains may find it easier to fork these implementation samples than to write an implementation from scratch.
You can also find community implementations for a variety of blockchains in the mesh-ecosystem repository, and in the ecosystem category of our community site.
This project is available open source under the terms of the Apache 2.0 License.
© 2022 Coinbase