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server.go
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server.go
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package server
import (
"fmt"
"net/http"
"time"
assert "github.com/coinbase/rosetta-sdk-go/asserter"
"github.com/coinbase/rosetta-sdk-go/server"
"github.com/coinbase/rosetta-sdk-go/types"
"github.com/cosmos/cosmos-sdk/server/rosetta/lib/internal/service"
crgtypes "github.com/cosmos/cosmos-sdk/server/rosetta/lib/types"
)
const (
DefaultRetries = 5
DefaultRetryWait = 5 * time.Second
)
// Settings define the rosetta server settings
type Settings struct {
// Network contains the information regarding the network
Network *types.NetworkIdentifier
// Client is the online API handler
Client crgtypes.Client
// Listen is the address the handler will listen at
Listen string
// Offline defines if the rosetta service should be exposed in offline mode
Offline bool
// Retries is the number of readiness checks that will be attempted when instantiating the handler
// valid only for online API
Retries int
// RetryWait is the time that will be waited between retries
RetryWait time.Duration
}
type Server struct {
h http.Handler
addr string
}
func (h Server) Start() error {
return http.ListenAndServe(h.addr, h.h) //nolint:gosec
}
func NewServer(settings Settings) (Server, error) {
asserter, err := assert.NewServer(
settings.Client.SupportedOperations(),
true,
[]*types.NetworkIdentifier{settings.Network},
nil,
false,
"",
)
if err != nil {
return Server{}, fmt.Errorf("cannot build asserter: %w", err)
}
var adapter crgtypes.API
switch settings.Offline {
case true:
adapter, err = newOfflineAdapter(settings)
case false:
adapter, err = newOnlineAdapter(settings)
}
if err != nil {
return Server{}, err
}
h := server.NewRouter(
server.NewAccountAPIController(adapter, asserter),
server.NewBlockAPIController(adapter, asserter),
server.NewNetworkAPIController(adapter, asserter),
server.NewMempoolAPIController(adapter, asserter),
server.NewConstructionAPIController(adapter, asserter),
)
return Server{
h: h,
addr: settings.Listen,
}, nil
}
func newOfflineAdapter(settings Settings) (crgtypes.API, error) {
if settings.Client == nil {
return nil, fmt.Errorf("client is nil")
}
return service.NewOffline(settings.Network, settings.Client)
}
func newOnlineAdapter(settings Settings) (crgtypes.API, error) {
if settings.Client == nil {
return nil, fmt.Errorf("client is nil")
}
if settings.Retries <= 0 {
settings.Retries = DefaultRetries
}
if settings.RetryWait == 0 {
settings.RetryWait = DefaultRetryWait
}
var err error
err = settings.Client.Bootstrap()
if err != nil {
return nil, err
}
for i := 0; i < settings.Retries; i++ {
err = settings.Client.Ready()
if err != nil {
time.Sleep(settings.RetryWait)
continue
}
return service.NewOnlineNetwork(settings.Network, settings.Client)
}
return nil, fmt.Errorf("maximum number of retries exceeded, last error: %w", err)
}