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package handler
import (
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"strings"
"github.com/ethereum-optimism/optimism/proxyd"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"gopkg.in/yaml.v3"
)
type MethodTemplate struct {
Method string `yaml:"method"`
Block string `yaml:"block"`
Response string `yaml:"response"`
}
type MockedHandler struct {
Overrides []*MethodTemplate
Autoload bool
AutoloadFile string
}
func (mh *MockedHandler) Serve(port int) error {
r := mux.NewRouter()
r.HandleFunc("/", mh.Handler)
http.Handle("/", r)
fmt.Printf("starting server up on :%d serving MockedResponsesFile %s\n", port, mh.AutoloadFile)
err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
if errors.Is(err, http.ErrServerClosed) {
fmt.Printf("server closed\n")
} else if err != nil {
fmt.Printf("error starting server: %s\n", err)
return err
}
return nil
}
func (mh *MockedHandler) Handler(w http.ResponseWriter, req *http.Request) {
body, err := io.ReadAll(req.Body)
if err != nil {
fmt.Printf("error reading request: %v\n", err)
}
var template []*MethodTemplate
if mh.Autoload {
template = append(template, mh.LoadFromFile(mh.AutoloadFile)...)
}
if mh.Overrides != nil {
template = append(template, mh.Overrides...)
}
batched := proxyd.IsBatch(body)
var requests []map[string]interface{}
if batched {
err = json.Unmarshal(body, &requests)
if err != nil {
fmt.Printf("error reading request: %v\n", err)
}
} else {
var j map[string]interface{}
err = json.Unmarshal(body, &j)
if err != nil {
fmt.Printf("error reading request: %v\n", err)
}
requests = append(requests, j)
}
var responses []string
for _, r := range requests {
method := r["method"]
block := ""
if method == "eth_getBlockByNumber" || method == "debug_getRawReceipts" {
block = (r["params"].([]interface{})[0]).(string)
}
var selectedResponse string
for _, r := range template {
if r.Method == method && r.Block == block {
selectedResponse = r.Response
}
}
if selectedResponse != "" {
var rpcRes proxyd.RPCRes
err = json.Unmarshal([]byte(selectedResponse), &rpcRes)
if err != nil {
panic(err)
}
idJson, _ := json.Marshal(r["id"])
rpcRes.ID = idJson
res, _ := json.Marshal(rpcRes)
responses = append(responses, string(res))
}
}
resBody := ""
if batched {
resBody = "[" + strings.Join(responses, ",") + "]"
} else if len(responses) > 0 {
resBody = responses[0]
}
_, err = fmt.Fprint(w, resBody)
if err != nil {
fmt.Printf("error writing response: %v\n", err)
}
}
func (mh *MockedHandler) LoadFromFile(file string) []*MethodTemplate {
contents, err := os.ReadFile(file)
if err != nil {
fmt.Printf("error reading MockedResponsesFile: %v\n", err)
}
var template []*MethodTemplate
err = yaml.Unmarshal(contents, &template)
if err != nil {
fmt.Printf("error reading MockedResponsesFile: %v\n", err)
}
return template
}
func (mh *MockedHandler) AddOverride(template *MethodTemplate) {
mh.Overrides = append(mh.Overrides, template)
}
func (mh *MockedHandler) ResetOverrides() {
mh.Overrides = make([]*MethodTemplate, 0)
}