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mw_stateful.go
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/
mw_stateful.go
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package main
import (
"fmt"
"net/http"
"log"
"sync"
)
//
func require() Middleware {
//
var services = &servicer{mu: sync.RWMutex{}}
return Middleware(func(f http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
path := r.URL.Path
defer func() {
if err := recover(); err != nil {
log.Printf("PANIC: %s: %+v", err, r)
}
}()
if path != "/fix" {
if err := services.failing(); err != nil {
w.WriteHeader(http.StatusInternalServerError)
log.Printf("error: %s: %+v", err, r)
fmt.Fprintf(w, "error: %+v: %s", path, err)
return
}
}
// Questionable whether to all fixing regardless of the state of the database and accounts.
db := services.database()
if db == nil {
w.WriteHeader(http.StatusServiceUnavailable)
log.Printf("uninitialized database: %+v", r)
fmt.Fprintln(w, "uninitialized database")
return
}
acc := services.accounts()
if acc == nil {
w.WriteHeader(http.StatusServiceUnavailable)
log.Printf("uninitialized accounts: %+v", r)
fmt.Fprintln(w, "uninitialized accounts")
return
}
log.Printf("processing: %+v\n", r)
ctx := &svctx{db: db, acc: acc}
f(w, r.WithContext(ctx))
if err := ctx.Err(); err != nil {
services.initializeFailure(err)
log.Printf("service error: %s: %+v", err, r)
fmt.Fprintln(w, err)
return
} else {
services.initializeFailure(nil)
}
if err := r.Context().Err(); err != nil {
log.Printf("request error: %s: %+v", err, r)
fmt.Fprintln(w, "internal error")
return
}
}
})
}