main.go

// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"context"
	"fmt"
	"net/http"
	"os"
	"time"

	"github.com/gorilla/mux"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"go.opentelemetry.io/otel/api/global"
	"go.opentelemetry.io/otel/api/kv"
	"go.opentelemetry.io/otel/exporters/trace/jaeger"
	"go.opentelemetry.io/otel/instrumentation/grpctrace"
	"google.golang.org/grpc"

	otelhttp "go.opentelemetry.io/contrib/instrumentation/net/http"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
)

const (
	port            = "8080"
	defaultCurrency = "USD"
	cookieMaxAge    = 60 * 60 * 48

	cookiePrefix    = "shop_"
	cookieSessionID = cookiePrefix + "session-id"
	cookieCurrency  = cookiePrefix + "currency"
)

var (
	whitelistedCurrencies = map[string]bool{
		"USD": true,
		"EUR": true,
		"CAD": true,
		"JPY": true,
		"GBP": true,
		"TRY": true}
)

type ctxKeySessionID struct{}

type frontendServer struct {
	productCatalogSvcAddr string
	productCatalogSvcConn *grpc.ClientConn

	currencySvcAddr string
	currencySvcConn *grpc.ClientConn

	cartSvcAddr string
	cartSvcConn *grpc.ClientConn

	recommendationSvcAddr string
	recommendationSvcConn *grpc.ClientConn