dinheiro

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package db

import (
	"context"
	"database/sql"
	"errors"
	"net/http"
)

var dbCtxKey = &contextKey{"db"}

type contextKey struct {
	name string
}

func Middleware(db *sql.DB) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			r = r.WithContext(Context(r.Context(), db))
			next.ServeHTTP(w, r)
		})
	}
}

func Context(ctx context.Context, db *sql.DB) context.Context {
	return context.WithValue(ctx, dbCtxKey, db)
}

func ForContext(ctx context.Context) (*sql.DB) {
	raw, ok := ctx.Value(dbCtxKey).(*sql.DB)

	if !ok {
		panic(errors.New("Invalid db context"))
	}

	return raw
}