diff --git a/agent/agent_endpoint.go b/agent/agent_endpoint.go index 8904f436d9..0e2b4b4803 100644 --- a/agent/agent_endpoint.go +++ b/agent/agent_endpoint.go @@ -701,6 +701,10 @@ func (s *HTTPServer) AgentMonitor(resp http.ResponseWriter, req *http.Request) ( // Send header so client can start streaming body resp.WriteHeader(http.StatusOK) + + // 0 byte write is needed before the Flush call so that if we are using + // a gzip stream it will go ahead and write out the HTTP response header + resp.Write([]byte("")) flusher.Flush() // Stream logs until the connection is closed. diff --git a/agent/http.go b/agent/http.go index ac254795ea..fbd077a3db 100644 --- a/agent/http.go +++ b/agent/http.go @@ -17,6 +17,7 @@ import ( "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/go-cleanhttp" "github.com/mitchellh/mapstructure" + "github.com/NYTimes/gziphandler" ) // MethodNotAllowedError should be returned by a handler when the HTTP method is not allowed. @@ -64,6 +65,7 @@ func registerEndpoint(pattern string, methods []string, fn unboundEndpoint) { if endpoints[pattern] != nil || allowedMethods[pattern] != nil { panic(fmt.Errorf("Pattern %q is already registered", pattern)) } + endpoints[pattern] = fn allowedMethods[pattern] = methods } @@ -111,7 +113,10 @@ func (s *HTTPServer) handler(enableDebug bool) http.Handler { metrics.MeasureSince(append([]string{"consul"}, key...), start) metrics.MeasureSince(key, start) } - mux.HandleFunc(pattern, wrapper) + + gzipWrapper, _ := gziphandler.GzipHandlerWithOpts(gziphandler.MinSize(0)) + gzipHandler := gzipWrapper(http.HandlerFunc(wrapper)) + mux.Handle(pattern, gzipHandler) } mux.HandleFunc("/", s.Index) diff --git a/vendor/github.com/NYTimes/gziphandler/LICENSE b/vendor/github.com/NYTimes/gziphandler/LICENSE new file mode 100644 index 0000000000..df6192d36f --- /dev/null +++ b/vendor/github.com/NYTimes/gziphandler/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + + APPENDIX: How to apply the Apache License to your work. + + To apply the Apache License to your work, attach the following + boilerplate notice, with the fields enclosed by brackets "[]" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright 2016-2017 The New York Times Company + + 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. diff --git a/vendor/github.com/NYTimes/gziphandler/README.md b/vendor/github.com/NYTimes/gziphandler/README.md new file mode 100644 index 0000000000..6d72460707 --- /dev/null +++ b/vendor/github.com/NYTimes/gziphandler/README.md @@ -0,0 +1,52 @@ +Gzip Handler +============ + +This is a tiny Go package which wraps HTTP handlers to transparently gzip the +response body, for clients which support it. Although it's usually simpler to +leave that to a reverse proxy (like nginx or Varnish), this package is useful +when that's undesirable. + + +## Usage + +Call `GzipHandler` with any handler (an object which implements the +`http.Handler` interface), and it'll return a new handler which gzips the +response. For example: + +```go +package main + +import ( + "io" + "net/http" + "github.com/NYTimes/gziphandler" +) + +func main() { + withoutGz := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.Header().Set("Content-Type", "text/plain") + io.WriteString(w, "Hello, World") + }) + + withGz := gziphandler.GzipHandler(withoutGz) + + http.Handle("/", withGz) + http.ListenAndServe("0.0.0.0:8000", nil) +} +``` + + +## Documentation + +The docs can be found at [godoc.org][docs], as usual. + + +## License + +[Apache 2.0][license]. + + + + +[docs]: https://godoc.org/github.com/nytimes/gziphandler +[license]: https://github.com/nytimes/gziphandler/blob/master/LICENSE.md diff --git a/vendor/github.com/NYTimes/gziphandler/gzip.go b/vendor/github.com/NYTimes/gziphandler/gzip.go new file mode 100644 index 0000000000..f91dcfa163 --- /dev/null +++ b/vendor/github.com/NYTimes/gziphandler/gzip.go @@ -0,0 +1,429 @@ +package gziphandler + +import ( + "bufio" + "compress/gzip" + "fmt" + "io" + "net" + "net/http" + "strconv" + "strings" + "sync" +) + +const ( + vary = "Vary" + acceptEncoding = "Accept-Encoding" + contentEncoding = "Content-Encoding" + contentType = "Content-Type" + contentLength = "Content-Length" +) + +type codings map[string]float64 + +const ( + // DefaultQValue is the default qvalue to assign to an encoding if no explicit qvalue is set. + // This is actually kind of ambiguous in RFC 2616, so hopefully it's correct. + // The examples seem to indicate that it is. + DefaultQValue = 1.0 + + // 1500 bytes is the MTU size for the internet since that is the largest size allowed at the network layer. + // If you take a file that is 1300 bytes and compress it to 800 bytes, it’s still transmitted in that same 1500 byte packet regardless, so you’ve gained nothing. + // That being the case, you should restrict the gzip compression to files with a size greater than a single packet, 1400 bytes (1.4KB) is a safe value. + DefaultMinSize = 1400 +) + +// gzipWriterPools stores a sync.Pool for each compression level for reuse of +// gzip.Writers. Use poolIndex to covert a compression level to an index into +// gzipWriterPools. +var gzipWriterPools [gzip.BestCompression - gzip.BestSpeed + 2]*sync.Pool + +func init() { + for i := gzip.BestSpeed; i <= gzip.BestCompression; i++ { + addLevelPool(i) + } + addLevelPool(gzip.DefaultCompression) +} + +// poolIndex maps a compression level to its index into gzipWriterPools. It +// assumes that level is a valid gzip compression level. +func poolIndex(level int) int { + // gzip.DefaultCompression == -1, so we need to treat it special. + if level == gzip.DefaultCompression { + return gzip.BestCompression - gzip.BestSpeed + 1 + } + return level - gzip.BestSpeed +} + +func addLevelPool(level int) { + gzipWriterPools[poolIndex(level)] = &sync.Pool{ + New: func() interface{} { + // NewWriterLevel only returns error on a bad level, we are guaranteeing + // that this will be a valid level so it is okay to ignore the returned + // error. + w, _ := gzip.NewWriterLevel(nil, level) + return w + }, + } +} + +// GzipResponseWriter provides an http.ResponseWriter interface, which gzips +// bytes before writing them to the underlying response. This doesn't close the +// writers, so don't forget to do that. +// It can be configured to skip response smaller than minSize. +type GzipResponseWriter struct { + http.ResponseWriter + index int // Index for gzipWriterPools. + gw *gzip.Writer + + code int // Saves the WriteHeader value. + + minSize int // Specifed the minimum response size to gzip. If the response length is bigger than this value, it is compressed. + buf []byte // Holds the first part of the write before reaching the minSize or the end of the write. + + contentTypes []string // Only compress if the response is one of these content-types. All are accepted if empty. +} + +type GzipResponseWriterWithCloseNotify struct { + *GzipResponseWriter +} + +func (w GzipResponseWriterWithCloseNotify) CloseNotify() <-chan bool { + return w.ResponseWriter.(http.CloseNotifier).CloseNotify() +} + +// Write appends data to the gzip writer. +func (w *GzipResponseWriter) Write(b []byte) (int, error) { + // If content type is not set. + if _, ok := w.Header()[contentType]; !ok { + // It infer it from the uncompressed body. + w.Header().Set(contentType, http.DetectContentType(b)) + } + + // GZIP responseWriter is initialized. Use the GZIP responseWriter. + if w.gw != nil { + n, err := w.gw.Write(b) + return n, err + } + + // Save the write into a buffer for later use in GZIP responseWriter (if content is long enough) or at close with regular responseWriter. + // On the first write, w.buf changes from nil to a valid slice + w.buf = append(w.buf, b...) + + // If the global writes are bigger than the minSize and we're about to write + // a response containing a content type we want to handle, enable + // compression. + if len(w.buf) >= w.minSize && handleContentType(w.contentTypes, w) && w.Header().Get(contentEncoding) == "" { + err := w.startGzip() + if err != nil { + return 0, err + } + } + + return len(b), nil +} + +// startGzip initialize any GZIP specific informations. +func (w *GzipResponseWriter) startGzip() error { + + // Set the GZIP header. + w.Header().Set(contentEncoding, "gzip") + + // if the Content-Length is already set, then calls to Write on gzip + // will fail to set the Content-Length header since its already set + // See: https://github.com/golang/go/issues/14975. + w.Header().Del(contentLength) + + // Write the header to gzip response. + if w.code != 0 { + w.ResponseWriter.WriteHeader(w.code) + } + + // Initialize the GZIP response. + w.init() + + // Flush the buffer into the gzip response. + n, err := w.gw.Write(w.buf) + + // This should never happen (per io.Writer docs), but if the write didn't + // accept the entire buffer but returned no specific error, we have no clue + // what's going on, so abort just to be safe. + if err == nil && n < len(w.buf) { + return io.ErrShortWrite + } + + w.buf = nil + return err +} + +// WriteHeader just saves the response code until close or GZIP effective writes. +func (w *GzipResponseWriter) WriteHeader(code int) { + if w.code == 0 { + w.code = code + } +} + +// init graps a new gzip writer from the gzipWriterPool and writes the correct +// content encoding header. +func (w *GzipResponseWriter) init() { + // Bytes written during ServeHTTP are redirected to this gzip writer + // before being written to the underlying response. + gzw := gzipWriterPools[w.index].Get().(*gzip.Writer) + gzw.Reset(w.ResponseWriter) + w.gw = gzw +} + +// Close will close the gzip.Writer and will put it back in the gzipWriterPool. +func (w *GzipResponseWriter) Close() error { + if w.gw == nil { + // Gzip not trigged yet, write out regular response. + if w.code != 0 { + w.ResponseWriter.WriteHeader(w.code) + } + if w.buf != nil { + _, writeErr := w.ResponseWriter.Write(w.buf) + // Returns the error if any at write. + if writeErr != nil { + return fmt.Errorf("gziphandler: write to regular responseWriter at close gets error: %q", writeErr.Error()) + } + } + return nil + } + + err := w.gw.Close() + gzipWriterPools[w.index].Put(w.gw) + w.gw = nil + return err +} + +// Flush flushes the underlying *gzip.Writer and then the underlying +// http.ResponseWriter if it is an http.Flusher. This makes GzipResponseWriter +// an http.Flusher. +func (w *GzipResponseWriter) Flush() { + if w.gw == nil { + // Only flush once startGzip has been called. + // + // Flush is thus a no-op until the written body + // exceeds minSize. + return + } + + w.gw.Flush() + + if fw, ok := w.ResponseWriter.(http.Flusher); ok { + fw.Flush() + } +} + +// Hijack implements http.Hijacker. If the underlying ResponseWriter is a +// Hijacker, its Hijack method is returned. Otherwise an error is returned. +func (w *GzipResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) { + if hj, ok := w.ResponseWriter.(http.Hijacker); ok { + return hj.Hijack() + } + return nil, nil, fmt.Errorf("http.Hijacker interface is not supported") +} + +// verify Hijacker interface implementation +var _ http.Hijacker = &GzipResponseWriter{} + +// MustNewGzipLevelHandler behaves just like NewGzipLevelHandler except that in +// an error case it panics rather than returning an error. +func MustNewGzipLevelHandler(level int) func(http.Handler) http.Handler { + wrap, err := NewGzipLevelHandler(level) + if err != nil { + panic(err) + } + return wrap +} + +// NewGzipLevelHandler returns a wrapper function (often known as middleware) +// which can be used to wrap an HTTP handler to transparently gzip the response +// body if the client supports it (via the Accept-Encoding header). Responses will +// be encoded at the given gzip compression level. An error will be returned only +// if an invalid gzip compression level is given, so if one can ensure the level +// is valid, the returned error can be safely ignored. +func NewGzipLevelHandler(level int) (func(http.Handler) http.Handler, error) { + return NewGzipLevelAndMinSize(level, DefaultMinSize) +} + +// NewGzipLevelAndMinSize behave as NewGzipLevelHandler except it let the caller +// specify the minimum size before compression. +func NewGzipLevelAndMinSize(level, minSize int) (func(http.Handler) http.Handler, error) { + return GzipHandlerWithOpts(CompressionLevel(level), MinSize(minSize)) +} + +func GzipHandlerWithOpts(opts ...option) (func(http.Handler) http.Handler, error) { + c := &config{ + level: gzip.DefaultCompression, + minSize: DefaultMinSize, + } + + for _, o := range opts { + o(c) + } + + if err := c.validate(); err != nil { + return nil, err + } + + return func(h http.Handler) http.Handler { + index := poolIndex(c.level) + + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + w.Header().Add(vary, acceptEncoding) + if acceptsGzip(r) { + gw := &GzipResponseWriter{ + ResponseWriter: w, + index: index, + minSize: c.minSize, + contentTypes: c.contentTypes, + } + defer gw.Close() + + if _, ok := w.(http.CloseNotifier); ok { + gwcn := GzipResponseWriterWithCloseNotify{gw} + h.ServeHTTP(gwcn, r) + } else { + h.ServeHTTP(gw, r) + } + + } else { + h.ServeHTTP(w, r) + } + }) + }, nil +} + +// Used for functional configuration. +type config struct { + minSize int + level int + contentTypes []string +} + +func (c *config) validate() error { + if c.level != gzip.DefaultCompression && (c.level < gzip.BestSpeed || c.level > gzip.BestCompression) { + return fmt.Errorf("invalid compression level requested: %d", c.level) + } + + if c.minSize < 0 { + return fmt.Errorf("minimum size must be more than zero") + } + + return nil +} + +type option func(c *config) + +func MinSize(size int) option { + return func(c *config) { + c.minSize = size + } +} + +func CompressionLevel(level int) option { + return func(c *config) { + c.level = level + } +} + +func ContentTypes(types []string) option { + return func(c *config) { + c.contentTypes = []string{} + for _, v := range types { + c.contentTypes = append(c.contentTypes, strings.ToLower(v)) + } + } +} + +// GzipHandler wraps an HTTP handler, to transparently gzip the response body if +// the client supports it (via the Accept-Encoding header). This will compress at +// the default compression level. +func GzipHandler(h http.Handler) http.Handler { + wrapper, _ := NewGzipLevelHandler(gzip.DefaultCompression) + return wrapper(h) +} + +// acceptsGzip returns true if the given HTTP request indicates that it will +// accept a gzipped response. +func acceptsGzip(r *http.Request) bool { + acceptedEncodings, _ := parseEncodings(r.Header.Get(acceptEncoding)) + return acceptedEncodings["gzip"] > 0.0 +} + +// returns true if we've been configured to compress the specific content type. +func handleContentType(contentTypes []string, w http.ResponseWriter) bool { + // If contentTypes is empty we handle all content types. + if len(contentTypes) == 0 { + return true + } + + ct := strings.ToLower(w.Header().Get(contentType)) + for _, c := range contentTypes { + if c == ct { + return true + } + } + + return false +} + +// parseEncodings attempts to parse a list of codings, per RFC 2616, as might +// appear in an Accept-Encoding header. It returns a map of content-codings to +// quality values, and an error containing the errors encountered. It's probably +// safe to ignore those, because silently ignoring errors is how the internet +// works. +// +// See: http://tools.ietf.org/html/rfc2616#section-14.3. +func parseEncodings(s string) (codings, error) { + c := make(codings) + var e []string + + for _, ss := range strings.Split(s, ",") { + coding, qvalue, err := parseCoding(ss) + + if err != nil { + e = append(e, err.Error()) + } else { + c[coding] = qvalue + } + } + + // TODO (adammck): Use a proper multi-error struct, so the individual errors + // can be extracted if anyone cares. + if len(e) > 0 { + return c, fmt.Errorf("errors while parsing encodings: %s", strings.Join(e, ", ")) + } + + return c, nil +} + +// parseCoding parses a single conding (content-coding with an optional qvalue), +// as might appear in an Accept-Encoding header. It attempts to forgive minor +// formatting errors. +func parseCoding(s string) (coding string, qvalue float64, err error) { + for n, part := range strings.Split(s, ";") { + part = strings.TrimSpace(part) + qvalue = DefaultQValue + + if n == 0 { + coding = strings.ToLower(part) + } else if strings.HasPrefix(part, "q=") { + qvalue, err = strconv.ParseFloat(strings.TrimPrefix(part, "q="), 64) + + if qvalue < 0.0 { + qvalue = 0.0 + } else if qvalue > 1.0 { + qvalue = 1.0 + } + } + } + + if coding == "" { + err = fmt.Errorf("empty content-coding") + } + + return +} diff --git a/vendor/github.com/NYTimes/gziphandler/gzip_go18.go b/vendor/github.com/NYTimes/gziphandler/gzip_go18.go new file mode 100644 index 0000000000..fa9665b7e8 --- /dev/null +++ b/vendor/github.com/NYTimes/gziphandler/gzip_go18.go @@ -0,0 +1,43 @@ +// +build go1.8 + +package gziphandler + +import "net/http" + +// Push initiates an HTTP/2 server push. +// Push returns ErrNotSupported if the client has disabled push or if push +// is not supported on the underlying connection. +func (w *GzipResponseWriter) Push(target string, opts *http.PushOptions) error { + pusher, ok := w.ResponseWriter.(http.Pusher) + if ok && pusher != nil { + return pusher.Push(target, setAcceptEncodingForPushOptions(opts)) + } + return http.ErrNotSupported +} + +// setAcceptEncodingForPushOptions sets "Accept-Encoding" : "gzip" for PushOptions without overriding existing headers. +func setAcceptEncodingForPushOptions(opts *http.PushOptions) *http.PushOptions { + + if opts == nil { + opts = &http.PushOptions{ + Header: http.Header{ + acceptEncoding: []string{"gzip"}, + }, + } + return opts + } + + if opts.Header == nil { + opts.Header = http.Header{ + acceptEncoding: []string{"gzip"}, + } + return opts + } + + if encoding := opts.Header.Get(acceptEncoding); encoding == "" { + opts.Header.Add(acceptEncoding, "gzip") + return opts + } + + return opts +} diff --git a/vendor/vendor.json b/vendor/vendor.json index 616fb036f1..a6faed82d2 100644 --- a/vendor/vendor.json +++ b/vendor/vendor.json @@ -4,6 +4,7 @@ "package": [ {"path":"github.com/DataDog/datadog-go/statsd","checksumSHA1":"JhyS/zIicgtrSasHSZ6WtXGWJVk=","revision":"cc2f4770f4d61871e19bfee967bc767fe730b0d9","revisionTime":"2016-03-29T13:52:53Z"}, {"path":"github.com/Microsoft/go-winio","checksumSHA1":"AzjRkOQtVBTwIw4RJLTygFhJs3s=","revision":"c4dc1301f1dc0307acd38e611aa375a64dfe0642","revisionTime":"2017-07-12T04:46:15Z"}, + {"path":"github.com/NYTimes/gziphandler","checksumSHA1":"GM+KgxfAv3HJdtffkEPpegaFxe0=","revision":"2600fb119af974220d3916a5916d6e31176aac1b","revisionTime":"2018-02-20T23:40:21Z","version":"v1.0.1","versionExact":"v1.0.1"}, {"path":"github.com/StackExchange/wmi","checksumSHA1":"9NR0rrcAT5J76C5xMS4AVksS9o0=","revision":"e54cbda6595d7293a7a468ccf9525f6bc8887f99","revisionTime":"2016-08-11T21:45:55Z"}, {"path":"github.com/armon/circbuf","checksumSHA1":"l0iFqayYAaEip6Olaq3/LCOa/Sg=","revision":"bbbad097214e2918d8543d5201d12bfd7bca254d","revisionTime":"2015-08-27T00:49:46Z"}, {"path":"github.com/armon/go-metrics","checksumSHA1":"0et4hA6AYqZCgYiY+c6Z17t3k3k=","revision":"023a4bbe4bb9bfb23ee7e1afc8d0abad217641f3","revisionTime":"2017-08-09T01:16:44Z"},