|
| 1 | +package proxy |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "context" |
| 6 | + _ "embed" |
| 7 | + "encoding/json" |
| 8 | + "fmt" |
| 9 | + "go.uber.org/zap" |
| 10 | + "html/template" |
| 11 | + "net/http" |
| 12 | + "net/http/httputil" |
| 13 | + "net/url" |
| 14 | + "regexp" |
| 15 | + "strconv" |
| 16 | + "strings" |
| 17 | + "time" |
| 18 | + |
| 19 | + "github.com/e2b-dev/infra/packages/shared/pkg/meters" |
| 20 | + "github.com/e2b-dev/infra/packages/shared/pkg/smap" |
| 21 | +) |
| 22 | + |
| 23 | +//go:embed proxy_browser_502.html |
| 24 | +var proxyBrowser502PageHtml string |
| 25 | + |
| 26 | +var browserRegex = regexp.MustCompile(`(?i)mozilla|chrome|safari|firefox|edge|opera|msie`) |
| 27 | +var browserTemplate = template.Must(template.New("template").Parse(proxyBrowser502PageHtml)) |
| 28 | + |
| 29 | +type htmlTemplateData struct { |
| 30 | + SandboxId string |
| 31 | + SandboxHost string |
| 32 | + SandboxPort string |
| 33 | +} |
| 34 | + |
| 35 | +type jsonTemplateData struct { |
| 36 | + Error string `json:"error"` |
| 37 | + SandboxId string `json:"sandboxId"` |
| 38 | + Port uint64 `json:"port"` |
| 39 | +} |
| 40 | + |
| 41 | +type SandboxProxy struct { |
| 42 | + sandboxes *smap.Map[string] |
| 43 | + server *http.Server |
| 44 | +} |
| 45 | + |
| 46 | +func New(port uint) *SandboxProxy { |
| 47 | + server := &http.Server{Addr: fmt.Sprintf(":%d", port)} |
| 48 | + |
| 49 | + return &SandboxProxy{ |
| 50 | + server: server, |
| 51 | + sandboxes: smap.New[string](), |
| 52 | + } |
| 53 | +} |
| 54 | + |
| 55 | +func (p *SandboxProxy) AddSandbox(sandboxID, ip string) { |
| 56 | + p.sandboxes.Insert(sandboxID, ip) |
| 57 | +} |
| 58 | + |
| 59 | +func (p *SandboxProxy) RemoveSandbox(sandboxID string, ip string) { |
| 60 | + p.sandboxes.RemoveCb(sandboxID, func(k string, v string, ok bool) bool { return ok && v == ip }) |
| 61 | +} |
| 62 | + |
| 63 | +func (p *SandboxProxy) Start() error { |
| 64 | + // similar values to our old the nginx configuration |
| 65 | + serverTransport := &http.Transport{ |
| 66 | + Proxy: http.ProxyFromEnvironment, |
| 67 | + MaxIdleConns: 1024, // Matches worker_connections |
| 68 | + MaxIdleConnsPerHost: 8192, // Matches keepalive_requests |
| 69 | + IdleConnTimeout: 620 * time.Second, // Matches keepalive_timeout |
| 70 | + TLSHandshakeTimeout: 10 * time.Second, // Similar to client_header_timeout |
| 71 | + ResponseHeaderTimeout: 24 * time.Hour, // Matches proxy_read_timeout |
| 72 | + DisableKeepAlives: true, // Disable keep-alives, envd doesn't support idle connections |
| 73 | + } |
| 74 | + |
| 75 | + p.server.Handler = http.HandlerFunc(p.proxyHandler(serverTransport)) |
| 76 | + return p.server.ListenAndServe() |
| 77 | +} |
| 78 | + |
| 79 | +func (p *SandboxProxy) Shutdown(ctx context.Context) { |
| 80 | + err := p.server.Shutdown(ctx) |
| 81 | + if err != nil { |
| 82 | + zap.L().Error("failed to shutdown proxy server", zap.Error(err)) |
| 83 | + } |
| 84 | +} |
| 85 | + |
| 86 | +func (p *SandboxProxy) proxyHandler(transport *http.Transport) func(w http.ResponseWriter, r *http.Request) { |
| 87 | + activeConnections, err := meters.GetUpDownCounter(meters.OrchestratorProxyActiveConnectionsCounterMeterName) |
| 88 | + if err != nil { |
| 89 | + zap.L().Error("failed to create active connections counter", zap.Error(err)) |
| 90 | + } |
| 91 | + |
| 92 | + return func(w http.ResponseWriter, r *http.Request) { |
| 93 | + if activeConnections != nil { |
| 94 | + activeConnections.Add(r.Context(), 1) |
| 95 | + defer func() { |
| 96 | + activeConnections.Add(r.Context(), -1) |
| 97 | + }() |
| 98 | + } |
| 99 | + |
| 100 | + // Extract sandbox id from the host (<port>-<sandbox id>-<old client id>.e2b.dev) |
| 101 | + hostSplit := strings.Split(r.Host, "-") |
| 102 | + if len(hostSplit) < 2 { |
| 103 | + zap.L().Warn("invalid host to proxy", zap.String("host", r.Host)) |
| 104 | + http.Error(w, "Invalid host", http.StatusBadRequest) |
| 105 | + return |
| 106 | + } |
| 107 | + |
| 108 | + sandboxID := hostSplit[1] |
| 109 | + sandboxPortRaw := hostSplit[0] |
| 110 | + sandboxPort, sandboxPortErr := strconv.ParseUint(sandboxPortRaw, 10, 64) |
| 111 | + if sandboxPortErr != nil { |
| 112 | + zap.L().Warn("invalid sandbox port", zap.String("sandbox_port", sandboxPortRaw)) |
| 113 | + http.Error(w, "Invalid sandbox port", http.StatusBadRequest) |
| 114 | + } |
| 115 | + |
| 116 | + sbxIp, sbxFound := p.sandboxes.Get(sandboxID) |
| 117 | + if !sbxFound { |
| 118 | + zap.L().Warn("sandbox not found", zap.String("sandbox_id", sandboxID)) |
| 119 | + http.Error(w, "Sandbox not found", http.StatusNotFound) |
| 120 | + return |
| 121 | + } |
| 122 | + |
| 123 | + logger := zap.L().With(zap.String("sandbox_id", sandboxID), zap.String("sandbox_ip", sbxIp), zap.Uint64("sandbox_req_port", sandboxPort), zap.String("sandbox_port_path", r.URL.Path)) |
| 124 | + |
| 125 | + // We've resolved the node to proxy the request to |
| 126 | + logger.Debug("Proxying request") |
| 127 | + targetUrl := &url.URL{ |
| 128 | + Scheme: "http", |
| 129 | + Host: fmt.Sprintf("%s:%d", sbxIp, sandboxPort), |
| 130 | + } |
| 131 | + |
| 132 | + // Proxy the request |
| 133 | + proxy := httputil.NewSingleHostReverseProxy(targetUrl) |
| 134 | + proxy.ErrorHandler = func(w http.ResponseWriter, r *http.Request, err error) { |
| 135 | + logger.Error("Reverse proxy error", zap.Error(err)) |
| 136 | + |
| 137 | + if p.isBrowser(r.UserAgent()) { |
| 138 | + res, resErr := p.buildHtmlClosedPortError(sandboxID, r.Host, sandboxPort) |
| 139 | + if resErr != nil { |
| 140 | + logger.Error("Failed to build HTML error response", zap.Error(resErr)) |
| 141 | + w.WriteHeader(http.StatusInternalServerError) |
| 142 | + return |
| 143 | + } |
| 144 | + |
| 145 | + w.WriteHeader(http.StatusBadGateway) |
| 146 | + w.Header().Add("Content-Type", "text/html") |
| 147 | + w.Write(res) |
| 148 | + return |
| 149 | + } |
| 150 | + |
| 151 | + w.WriteHeader(http.StatusBadGateway) |
| 152 | + w.Header().Add("Content-Type", "application/json") |
| 153 | + w.Write(p.buildJsonClosedPortError(sandboxID, sandboxPort)) |
| 154 | + } |
| 155 | + |
| 156 | + proxy.ModifyResponse = func(resp *http.Response) error { |
| 157 | + if resp.StatusCode >= 500 { |
| 158 | + logger.Error("Backend responded with error", zap.Int("status_code", resp.StatusCode)) |
| 159 | + } else { |
| 160 | + logger.Info("Backend responded", zap.Int("status_code", resp.StatusCode)) |
| 161 | + } |
| 162 | + |
| 163 | + return nil |
| 164 | + } |
| 165 | + |
| 166 | + proxy.Transport = transport |
| 167 | + proxy.ServeHTTP(w, r) |
| 168 | + } |
| 169 | +} |
| 170 | + |
| 171 | +func (p *SandboxProxy) buildHtmlClosedPortError(sandboxId string, host string, port uint64) ([]byte, error) { |
| 172 | + htmlResponse := new(bytes.Buffer) |
| 173 | + htmlVars := htmlTemplateData{SandboxId: sandboxId, SandboxHost: host, SandboxPort: strconv.FormatUint(port, 10)} |
| 174 | + |
| 175 | + err := browserTemplate.Execute(htmlResponse, htmlVars) |
| 176 | + if err != nil { |
| 177 | + return nil, err |
| 178 | + } |
| 179 | + |
| 180 | + return htmlResponse.Bytes(), nil |
| 181 | +} |
| 182 | + |
| 183 | +func (p *SandboxProxy) buildJsonClosedPortError(sandboxId string, port uint64) []byte { |
| 184 | + response := jsonTemplateData{ |
| 185 | + Error: "The sandbox is running but port is not open", |
| 186 | + SandboxId: sandboxId, |
| 187 | + Port: port, |
| 188 | + } |
| 189 | + |
| 190 | + responseBytes, _ := json.Marshal(response) |
| 191 | + return responseBytes |
| 192 | +} |
| 193 | + |
| 194 | +func (p *SandboxProxy) isBrowser(userAgent string) bool { |
| 195 | + return browserRegex.MatchString(userAgent) |
| 196 | +} |
0 commit comments