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server_middleware.go
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server_middleware.go
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package rpc
import (
"context"
"net/http"
"github.com/Conflux-Chain/confura/node"
"github.com/Conflux-Chain/confura/util/rate"
"github.com/Conflux-Chain/confura/util/rpc/handlers"
"github.com/Conflux-Chain/confura/util/rpc/middlewares"
sdk "github.com/Conflux-Chain/go-conflux-sdk"
"github.com/openweb3/go-rpc-provider"
)
const (
ctxKeyClientProvider = handlers.CtxKey("Infura-RPC-Client-Provider")
ctxKeyClient = handlers.CtxKey("Infura-RPC-Client")
ctxKeyClientGroup = handlers.CtxKey("Infura-RPC-Client-Group")
)
// go-rpc-provider only supports static middlewares for RPC server.
func init() {
// middlewares executed in order
// panic recovery
rpc.HookHandleCallMsg(middlewares.Recover)
// anti-injection
rpc.HookHandleCallMsg(middlewares.AntiInjection)
// auth
rpc.HookHandleCallMsg(middlewares.Auth())
// allow lists
rpc.HookHandleCallMsg(middlewares.Allowlists)
// rate limit
rpc.HookHandleCallMsg(middlewares.DailyMaxReqRateLimit)
rpc.HookHandleCallMsg(middlewares.QpsRateLimit)
// metrics
rpc.HookHandleBatch(middlewares.MetricsBatch)
rpc.HookHandleCallMsg(middlewares.Metrics)
// log
rpc.HookHandleBatch(middlewares.LogBatch)
rpc.HookHandleCallMsg(middlewares.Log)
// cfx/eth client
rpc.HookHandleCallMsg(clientMiddleware)
// invalid json rpc request without `ID`
rpc.HookHandleCallMsg(rpc.PreventMessagesWithouID)
}
// Inject values into context for static RPC call middlewares, e.g. rate limit
func httpMiddleware(registry *rate.Registry, clientProvider interface{}) handlers.Middleware {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if token := handlers.GetAccessToken(r); len(token) > 0 { // optional
ctx = context.WithValue(ctx, handlers.CtxKeyAccessToken, token)
}
ctx = context.WithValue(ctx, handlers.CtxKeyReqOrigin, r.Header.Get("Origin"))
ctx = context.WithValue(ctx, handlers.CtxKeyUserAgent, r.Header.Get("User-Agent"))
ctx = context.WithValue(ctx, handlers.CtxKeyRealIP, handlers.GetIPAddress(r))
if registry != nil {
ctx = context.WithValue(ctx, handlers.CtxKeyRateRegistry, registry)
}
if clientProvider != nil {
ctx = context.WithValue(ctx, ctxKeyClientProvider, clientProvider)
}
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}
func clientMiddleware(next rpc.HandleCallMsgFunc) rpc.HandleCallMsgFunc {
return func(ctx context.Context, msg *rpc.JsonRpcMessage) *rpc.JsonRpcMessage {
var client interface{}
var grp node.Group
var err error
if cfxProvider, ok := ctx.Value(ctxKeyClientProvider).(*node.CfxClientProvider); ok {
client, grp, err = getCfxClientFromProviderWithContext(ctx, msg.Method, cfxProvider)
} else if ethProvider, ok := ctx.Value(ctxKeyClientProvider).(*node.EthClientProvider); ok {
client, grp, err = getEthClientFromProviderWithContext(ctx, msg.Method, ethProvider)
} else {
return next(ctx, msg)
}
if err != nil { // no fullnode available to request RPC
return msg.ErrorResponse(err)
}
ctx = context.WithValue(ctx, ctxKeyClient, client)
ctx = context.WithValue(ctx, ctxKeyClientGroup, grp)
return next(ctx, msg)
}
}
func GetCfxClientFromContext(ctx context.Context) sdk.ClientOperator {
return ctx.Value(ctxKeyClient).(sdk.ClientOperator)
}
func GetEthClientFromContext(ctx context.Context) *node.Web3goClient {
return ctx.Value(ctxKeyClient).(*node.Web3goClient)
}
func GetClientGroupFromContext(ctx context.Context) node.Group {
return ctx.Value(ctxKeyClientGroup).(node.Group)
}
func getEthClientFromProviderWithContext(
ctx context.Context, rpcMethod string, p *node.EthClientProvider) (*node.Web3goClient, node.Group, error) {
grp := node.GroupEthHttp
switch {
case rpcMethod == rpcMethodEthGetLogs:
grp = node.GroupEthLogs
case isEthFilterRpcMethod(rpcMethod):
grp = node.GroupEthFilter
default:
if authId, ok := handlers.GetAuthIdFromContext(ctx); ok {
grp, ok := p.GetRouteGroup(authId)
if ok && len(grp) > 0 {
client, err := p.GetClient(authId, grp)
return client, grp, err
}
}
}
client, err := p.GetClientByIP(ctx, grp)
return client, grp, err
}
func getCfxClientFromProviderWithContext(
ctx context.Context, rpcMethod string, p *node.CfxClientProvider) (sdk.ClientOperator, node.Group, error) {
grp := node.GroupCfxHttp
switch {
case rpcMethod == rpcMethodCfxGetLogs:
grp = node.GroupCfxLogs
case isCfxFilterRpcMethod(rpcMethod):
grp = node.GroupCfxFilter
default:
if authId, ok := handlers.GetAuthIdFromContext(ctx); ok {
grp, ok := p.GetRouteGroup(authId)
if ok && len(grp) > 0 {
client, err := p.GetClient(authId, grp)
return client, grp, err
}
}
}
client, err := p.GetClientByIP(ctx, grp)
return client, grp, err
}