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scf.go
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scf.go
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package server
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"os"
"runtime/debug"
"strings"
"github.com/Mrs4s/MiraiGo/utils"
log "github.com/sirupsen/logrus"
"gopkg.in/yaml.v3"
"github.com/Mrs4s/go-cqhttp/coolq"
"github.com/Mrs4s/go-cqhttp/global"
api2 "github.com/Mrs4s/go-cqhttp/modules/api"
"github.com/Mrs4s/go-cqhttp/modules/config"
)
type lambdaClient struct {
nextURL string
responseURL string
lambdaType string
client http.Client
}
type lambdaResponse struct {
IsBase64Encoded bool `json:"isBase64Encoded"`
StatusCode int `json:"statusCode"`
Headers map[string]string `json:"headers"`
Body string `json:"body"`
}
type lambdaResponseWriter struct {
statusCode int
buf bytes.Buffer
header http.Header
}
func (l *lambdaResponseWriter) Write(p []byte) (n int, err error) {
return l.buf.Write(p)
}
func (l *lambdaResponseWriter) Header() http.Header {
return l.header
}
func (l *lambdaResponseWriter) flush() error {
buffer := global.NewBuffer()
defer global.PutBuffer(buffer)
body := utils.B2S(l.buf.Bytes())
header := make(map[string]string)
for k, v := range l.header {
header[k] = v[0]
}
_ = json.NewEncoder(buffer).Encode(&lambdaResponse{
IsBase64Encoded: false,
StatusCode: l.statusCode,
Headers: header,
Body: body,
})
r, _ := http.NewRequest("POST", cli.responseURL, buffer)
do, err := cli.client.Do(r)
if err != nil {
return err
}
return do.Body.Close()
}
func (l *lambdaResponseWriter) WriteHeader(statusCode int) {
l.statusCode = statusCode
}
var cli *lambdaClient
// runLambda type: [scf,aws]
func runLambda(bot *coolq.CQBot, node yaml.Node) {
var conf config.LambdaServer
switch err := node.Decode(&conf); {
case err != nil:
log.Warn("读取lambda配置失败 :", err)
fallthrough
case conf.Disabled:
return
}
cli = &lambdaClient{
lambdaType: conf.Type,
client: http.Client{Timeout: 0},
}
switch cli.lambdaType { // todo: aws
case "scf": // tencent serverless function
base := fmt.Sprintf("http://%s:%s/runtime/",
os.Getenv("SCF_RUNTIME_API"),
os.Getenv("SCF_RUNTIME_API_PORT"))
cli.nextURL = base + "invocation/next"
cli.responseURL = base + "invocation/response"
post, err := http.Post(base+"init/ready", "", nil)
if err != nil {
log.Warnf("lambda 初始化失败: %v", err)
return
}
_ = post.Body.Close()
case "aws": // aws lambda
const apiVersion = "2018-06-01"
base := fmt.Sprintf("http://%s/%s/runtime/", os.Getenv("AWS_LAMBDA_RUNTIME_API"), apiVersion)
cli.nextURL = base + "invocation/next"
cli.responseURL = base + "invocation/response"
default:
log.Fatal("unknown lambda type:", conf.Type)
}
api := api2.NewCaller(bot)
if conf.RateLimit.Enabled {
api.Use(rateLimit(conf.RateLimit.Frequency, conf.RateLimit.Bucket))
}
server := &httpServer{
api: api,
accessToken: conf.AccessToken,
}
for {
req := cli.next()
writer := lambdaResponseWriter{statusCode: 200, header: make(http.Header)}
func() {
defer func() {
if e := recover(); e != nil {
log.Warnf("Lambda 出现不可恢复错误: %v\n%s", e, debug.Stack())
}
}()
if req != nil {
server.ServeHTTP(&writer, req)
}
}()
if err := writer.flush(); err != nil {
log.Warnf("Lambda 发送响应失败: %v", err)
}
}
}
type lambdaInvoke struct {
Headers map[string]string
HTTPMethod string `json:"httpMethod"`
Body string `json:"body"`
Path string `json:"path"`
QueryString map[string]string
RequestContext struct {
Path string `json:"path"`
} `json:"requestContext"`
}
func (c *lambdaClient) next() *http.Request {
r, err := http.NewRequest(http.MethodGet, c.nextURL, nil)
if err != nil {
return nil
}
resp, err := c.client.Do(r)
if err != nil {
return nil
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil
}
req := new(http.Request)
invoke := new(lambdaInvoke)
_ = json.NewDecoder(resp.Body).Decode(invoke)
if invoke.HTTPMethod == "" { // 不是 api 网关
return nil
}
req.Method = invoke.HTTPMethod
req.Body = io.NopCloser(strings.NewReader(invoke.Body))
req.Header = make(map[string][]string)
for k, v := range invoke.Headers {
req.Header.Set(k, v)
}
req.URL = new(url.URL)
req.URL.Path = strings.TrimPrefix(invoke.Path, invoke.RequestContext.Path)
// todo: avoid encoding
query := make(url.Values)
for k, v := range invoke.QueryString {
query[k] = []string{v}
}
req.URL.RawQuery = query.Encode()
return req
}