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server.go
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server.go
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package golangruntime
import (
"fmt"
"io/ioutil"
"net/http"
"os"
"runtime/debug"
)
var initialize func(ctx *FCContext) error
var handler func(ctx *FCContext, event []byte) ([]byte, error)
func invokeHandler(w http.ResponseWriter, req *http.Request) {
requestID := req.Header.Get(fcRequestID)
fmt.Println(fmt.Sprintf(fcLogTailStartPrefix, requestID))
defer func() {
if r := recover(); r != nil {
//if the function is abnormal, try ger error info as response
w.Header().Set(fcStatus, "404")
errMsg := fmt.Sprintf("Error: %+v;\nStack: %s", r, string(debug.Stack()))
fmt.Println(errMsg)
fmt.Println(fmt.Sprintf(fcLogTailEndPrefix, requestID) + ", Error: Unhandled function error")
w.Write([]byte(errMsg))
} else {
fmt.Println(fmt.Sprintf(fcLogTailEndPrefix, requestID))
}
}()
event, err := ioutil.ReadAll(req.Body)
if err != nil {
panic(err)
}
fcCtx := NewFromContext(req)
resp, err := handler(fcCtx, event)
if err != nil {
w.Header().Set(fcStatus, "404")
w.Write([]byte(fmt.Sprintf("Error: %+v;", err)))
return
}
w.Write(resp)
}
func initializeHandler(w http.ResponseWriter, req *http.Request) {
requestID := req.Header.Get(fcRequestID)
fmt.Println(fmt.Sprintf(fcInitializeLogTailStartPrefix, requestID))
defer func() {
fmt.Println(fmt.Sprintf(fcLogInitializeTailEndPrefix, requestID))
}()
fcCtx := NewFromContext(req)
if initialize == nil {
panic("this function doesn't have initialize")
}
err := initialize(fcCtx)
if err != nil {
panic(err)
}
w.Write([]byte(""))
}
func handle(w http.ResponseWriter, req *http.Request) {
controlPath := req.Header.Get(fcControlPath)
if controlPath == "/initialize" {
initializeHandler(w, req)
} else {
invokeHandler(w, req)
}
}
// Start ...
func Start(h func(ctx *FCContext, event []byte) ([]byte, error), init func(ctx *FCContext) error) {
handler = h
initialize = init
fmt.Println("FunctionCompute go runtime inited.")
http.HandleFunc("/", handle)
port := os.Getenv("FC_SERVER_PORT")
if port == "" {
port = "9000"
}
http.ListenAndServe(":"+port, nil)
}