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freighter.go
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freighter.go
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package freighter
import (
"fmt"
"net/http"
"net/url"
"os"
"time"
"github.com/ShardulNalegave/freighter/analytics"
"github.com/ShardulNalegave/freighter/pool"
"github.com/ShardulNalegave/freighter/strategy"
"github.com/ShardulNalegave/freighter/utils"
"github.com/rs/zerolog"
)
type Options struct {
URL *url.URL
Strategy strategy.Strategy
Backends []*pool.Backend
HealthCheckInterval time.Duration
EnableConsoleLogging bool
}
type Freighter struct {
URL *url.URL
a *analytics.Analytics
pl *pool.ServerPool
logger zerolog.Logger
Strategy strategy.Strategy
healthCheckInterval time.Duration
}
func (f *Freighter) ListenAndServe() {
go HealthCheck(f.pl, f.healthCheckInterval)
f.logger.Info().Str("HOST", f.URL.Host).Msg("Listening...")
if err := http.ListenAndServe(f.URL.Host, http.HandlerFunc(f.Handle)); err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
}
func (f *Freighter) Handle(w http.ResponseWriter, r *http.Request) {
if backend := f.Strategy.Handle(r, f.pl); backend != nil {
f.logger.Info().
Str("Backend.ID", backend.ID).
Str("Request.RemoteAddr", r.RemoteAddr).
Str("Request.Method", r.Method).
Str("Request.URI", r.URL.RequestURI()).
Msg("Forwarding an incoming request")
backend.ReverseProxy.ServeHTTP(w, r)
} else {
f.logger.Error().
Str("Request.RemoteAddr", r.RemoteAddr).
Str("Request.Method", r.Method).
Str("Request.URI", r.URL.RequestURI()).
Msg("No backend returned by set strategy")
http.Error(w, "Service unavailable", http.StatusServiceUnavailable)
}
}
func NewFreighter(opts *Options) *Freighter {
a := analytics.NewAnalytics()
logger := utils.NewLogger(a, opts.EnableConsoleLogging)
return &Freighter{
URL: opts.URL,
Strategy: opts.Strategy,
a: a,
logger: logger,
pl: pool.NewServerPool(opts.Backends, &logger),
healthCheckInterval: opts.HealthCheckInterval,
}
}