xP: use buffered reads

For non-trivial types, which are expensive to serialize
with encoding/json's struct reflection.

xC-gen-proto-go.awk

@@ -206,13 +206,14 @@ function codegen_enum(name, cg,    gotype, fields) {
 	print "}"
 	print ""
 
+	CodegenIsMarshaler[name] = 1
 	fields = cg["marshal"]
 	sub(/,\n$/, ":", fields)
 	gsub(/\n/, "\n\t", fields)
 	print "func (v " gotype ") MarshalJSON() ([]byte, error) {"
 	print "\tswitch v {"
 	print indent("case " fields)
-	print "\t\treturn json.Marshal(v.String())"
+	print "\t\treturn []byte(`\"` + v.String() + `\"`), nil"
 	print "\t}"
 	print "\treturn json.Marshal(int(v))"
 	print "}"
@@ -252,7 +253,50 @@ function codegen_enum(name, cg,    gotype, fields) {
 		delete cg[i]
 }
 
+function codegen_struct_field_marshal(d, cg,    camel, f, marshal) {
+	camel = snaketocamel(d["name"])
+	f = "s." camel
+
+	# Complex types are json.Marshalers, there's no need to json.Marshal(&f).
+	if (!d["isarray"]) {
+		if (CodegenIsMarshaler[d["type"]])
+			marshal = f ".MarshalJSON()"
+		else
+			marshal = "json.Marshal(" f ")"
+
+		append(cg, "marshal",
+			"\tb = append(b, `,\"" decapitalize(camel) "\":`...)\n" \
+			"\tif j, err := " marshal "; err != nil {\n" \
+			"\t\treturn nil, err\n" \
+			"\t} else {\n" \
+			"\t\tb = append(b, j...)\n" \
+			"\t}\n")
+		return
+	}
+
+	if (CodegenIsMarshaler[d["type"]])
+		marshal = f "[i].MarshalJSON()"
+	else
+		marshal = "json.Marshal(" f "[i])"
+
+	append(cg, "marshal",
+		"\tb = append(b, `,\"" decapitalize(camel) "\":[`...)\n" \
+		"\tfor i := 0; i < len(" f "); i++ {\n" \
+		"\t\tif i > 0 {\n" \
+		"\t\t\tb = append(b, ',')\n" \
+		"\t\t}\n" \
+		"\t\tif j, err := " marshal "; err != nil {\n" \
+		"\t\t\treturn nil, err\n" \
+		"\t\t} else {\n" \
+		"\t\t\tb = append(b, j...)\n" \
+		"\t\t}\n" \
+		"\t}\n" \
+		"\tb = append(b, ']')\n")
+}
+
 function codegen_struct_field(d, cg,    camel, f, serialize, deserialize) {
+	codegen_struct_field_marshal(d, cg)
+
 	camel = snaketocamel(d["name"])
 	f = "s." camel
 	serialize = CodegenSerialize[d["type"]]
@@ -303,6 +347,8 @@ function codegen_struct_field(d, cg,    camel, f, serialize, deserialize) {
 }
 
 function codegen_struct_tag(d, cg,    camel, f) {
+	codegen_struct_field_marshal(d, cg)
+
 	camel = snaketocamel(d["name"])
 	f = "s." camel
 	append(cg, "fields", "\t" camel " " CodegenGoType[d["type"]] \
@@ -315,6 +361,16 @@ function codegen_struct(name, cg,    gotype) {
 	gotype = PrefixCamel name
 	print "type " gotype " struct {\n" cg["fields"] "}\n"
 
+	if (cg["marshal"]) {
+		CodegenIsMarshaler[name] = 1
+		print "func (s *" gotype ") MarshalJSON() ([]byte, error) {"
+		print "\tb := []byte{}"
+		print cg["marshal"] "\tb[0] = '{'"
+		print "\treturn append(b, '}'), nil"
+		print "}"
+		print ""
+	}
+
 	if (cg["serialize"]) {
 		print "func (s *" gotype ") AppendTo(data []byte) ([]byte, bool) {"
 		print "\tok := true"
@@ -362,15 +418,15 @@ function codegen_union_struct(name, casename, cg, scg,     structname, init) {
 		"\tcase " CodegenGoType[cg["tagtype"]] snaketocamel(casename) ":\n" \
 		"\t\ts := " init "\n" \
 		"\t\terr = json.Unmarshal(data, &s)\n" \
-		"\t\tu.Interface = s\n")
+		"\t\tu.Interface = &s\n")
 	append(cg, "serialize",
-		"\tcase " CodegenGoType[structname] ":\n" \
+		"\tcase *" CodegenGoType[structname] ":\n" \
 		indent(sprintf(CodegenSerialize[structname], "union")))
 	append(cg, "deserialize",
 		"\tcase " CodegenGoType[cg["tagtype"]] snaketocamel(casename) ":\n" \
 		"\t\ts := " init "\n" \
 		indent(sprintf(CodegenDeserialize[structname], "s")) \
-		"\t\tu.Interface = s\n")
+		"\t\tu.Interface = &s\n")
 }
 
 function codegen_union(name, cg,    gotype, tagfield, tagvar) {
@@ -381,8 +437,9 @@ function codegen_union(name, cg,    gotype, tagfield, tagvar) {
 	print ""
 
 	# This cannot be a pointer method, it wouldn't work recursively.
+	CodegenIsMarshaler[name] = 1
 	print "func (u " gotype ") MarshalJSON() ([]byte, error) {"
-	print "\treturn json.Marshal(u.Interface)"
+	print "\treturn u.Interface.(json.Marshaler).MarshalJSON()"
 	print "}"
 	print ""
 

xC.c

@@ -1541,6 +1541,7 @@ struct formatter
 	struct app_context *ctx;            ///< Application context
 	struct server *s;                   ///< Server
 
+	bool clean;                         ///< Assume ATTR_RESET
 	struct formatter_item *items;       ///< Items
 	size_t items_len;                   ///< Items used
 	size_t items_alloc;                 ///< Items allocated
@@ -1549,7 +1550,7 @@ struct formatter
 static struct formatter
 formatter_make (struct app_context *ctx, struct server *s)
 {
-	struct formatter self = { .ctx = ctx, .s = s };
+	struct formatter self = { .ctx = ctx, .s = s, .clean = true };
 	self.items = xcalloc (sizeof *self.items, (self.items_alloc = 16));
 	return self;
 }
@@ -3811,7 +3812,7 @@ irc_to_utf8 (const char *text)
 //   #d inserts a signed integer
 //   #l inserts a locale-encoded string
 //
-//   #S inserts a string from the server with unknown encoding
+//   #S inserts a string from the server in an unknown encoding
 //   #m inserts an IRC-formatted string (auto-resets at boundaries)
 //   #n cuts the nickname from a string and automatically colours it
 //   #N is like #n but also appends userhost, if present
@@ -3827,6 +3828,17 @@ irc_to_utf8 (const char *text)
 static void
 formatter_add_item (struct formatter *self, struct formatter_item template_)
 {
+	// Auto-resetting tends to create unnecessary items,
+	// which also end up being relayed to frontends, so filter them out.
+	bool reset =
+		template_.type == FORMATTER_ITEM_ATTR &&
+		template_.attribute == ATTR_RESET;
+	if (self->clean && reset)
+		return;
+
+	self->clean = reset ||
+		(self->clean && template_.type == FORMATTER_ITEM_TEXT);
+
 	if (template_.text)
 		template_.text = xstrdup (template_.text);
 

xP/go.mod

@@ -2,4 +2,9 @@ module janouch.name/xK/xP
 
 go 1.18
 
-require golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d
+require nhooyr.io/websocket v1.8.7
+
+require (
+	github.com/klauspost/compress v1.15.9 // indirect
+	golang.org/x/sys v0.0.0-20210423082822-04245dca01da // indirect
+)

xP/go.sum

@@ -1,2 +1,62 @@
-golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d h1:20cMwl2fHAzkJMEA+8J4JgqBQcQGzbisXo31MIeenXI=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
+github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.6.3 h1:ahKqKTFpO5KTPHxWZjEdPScmYaGtLo8Y4DMHoEsnp14=
+github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwvtwp4M=
+github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
+github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q=
+github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
+github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=
+github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
+github.com/go-playground/validator/v10 v10.2.0 h1:KgJ0snyC2R9VXYN2rneOtQcw5aHQB1Vv0sFl1UcHBOY=
+github.com/go-playground/validator/v10 v10.2.0/go.mod h1:uOYAAleCW8F/7oMFd6aG0GOhaH6EGOAJShg8Id5JGkI=
+github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee h1:s+21KNqlpePfkah2I+gwHF8xmJWRjooY+5248k6m4A0=
+github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee/go.mod h1:L0fX3K22YWvt/FAX9NnzrNzcI4wNYi9Yku4O0LKYflo=
+github.com/gobwas/pool v0.2.0 h1:QEmUOlnSjWtnpRGHF3SauEiOsy82Cup83Vf2LcMlnc8=
+github.com/gobwas/pool v0.2.0/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
+github.com/gobwas/ws v1.0.2 h1:CoAavW/wd/kulfZmSIBt6p24n4j7tHgNVCjsfHVNUbo=
+github.com/gobwas/ws v1.0.2/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
+github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
+github.com/golang/protobuf v1.3.5 h1:F768QJ1E9tib+q5Sc8MkdJi1RxLTbRcTf8LJV56aRls=
+github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
+github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
+github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/json-iterator/go v1.1.9 h1:9yzud/Ht36ygwatGx56VwCZtlI/2AD15T1X2sjSuGns=
+github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
+github.com/klauspost/compress v1.10.3/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/compress v1.15.9 h1:wKRjX6JRtDdrE9qwa4b/Cip7ACOshUI4smpCQanqjSY=
+github.com/klauspost/compress v1.15.9/go.mod h1:PhcZ0MbTNciWF3rruxRgKxI5NkcHHrHUDtV4Yw2GlzU=
+github.com/leodido/go-urn v1.2.0 h1:hpXL4XnriNwQ/ABnpepYM/1vCLWNDfUNts8dX3xTG6Y=
+github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 h1:ZqeYNhU3OHLH3mGKHDcjJRFFRrJa6eAM5H+CtDdOsPc=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLDQ0W1YjYsBW+p8U2u7vzgW2SQVmlNazg=
+github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/ugorji/go v1.1.7 h1:/68gy2h+1mWMrwZFeD1kQialdSzAb432dtpeJ42ovdo=
+github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
+github.com/ugorji/go/codec v1.1.7 h1:2SvQaVZ1ouYrrKKwoSk2pzd4A9evlKJb9oTL+OaLUSs=
+github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+nhooyr.io/websocket v1.8.7 h1:usjR2uOr/zjjkVMy0lW+PPohFok7PCow5sDjLgX4P4g=
+nhooyr.io/websocket v1.8.7/go.mod h1:B70DZP8IakI65RVQ51MsWP/8jndNma26DVA/nFSCgW0=

xP/public/xP.js

@@ -56,8 +56,6 @@ class RelayRpc extends EventTarget {
 	}
 
 	_process(data) {
-		console.log(data)
-
 		if (typeof data !== 'string')
 			throw "Binary messages not supported"
 
@@ -85,11 +83,8 @@ class RelayRpc extends EventTarget {
 			if (typeof e.event !== 'string')
 				throw "Invalid event tag"
 
-			this.dispatchEvent(new CustomEvent(
+			e.eventSeq = message.eventSeq
-				e.event, {detail: {eventSeq: message.eventSeq, ...e}}))
+			this.dispatchEvent(new CustomEvent('event', {detail: e}))
-
-			// Minor abstraction layering violation.
-			m.redraw()
 			return
 		}
 
@@ -186,6 +181,7 @@ function updateIcon(highlighted) {
 // ---- Event processing -------------------------------------------------------
 
 let rpc = new RelayRpc(proxy)
+let rpcEventHandlers = {}
 
 let buffers = new Map()
 let bufferLast = undefined
@@ -250,14 +246,23 @@ rpc.addEventListener('close', event => {
 	m.redraw()
 })
 
-rpc.addEventListener('Ping', event => {
+rpc.addEventListener('event', event => {
-	rpc.send({command: 'PingResponse', eventSeq: event.detail.eventSeq})
+	const handler = rpcEventHandlers[event.detail.event]
+	if (handler !== undefined) {
+		handler(event.detail)
+		if (bufferCurrent !== undefined || event.detail.event !== 'BufferLine')
+			m.redraw()
+	}
 })
 
+rpcEventHandlers['Ping'] = e => {
+	rpc.send({command: 'PingResponse', eventSeq: e.eventSeq})
+}
+
 // ~~~ Buffer events ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-rpc.addEventListener('BufferUpdate', event => {
+rpcEventHandlers['BufferUpdate'] = e => {
-	let e = event.detail, b = buffers.get(e.bufferName)
+	let b = buffers.get(e.bufferName)
 	if (b === undefined) {
 		buffers.set(e.bufferName, (b = {
 			lines: [],
@@ -270,38 +275,36 @@ rpc.addEventListener('BufferUpdate', event => {
 	b.hideUnimportant = e.hideUnimportant
 	b.kind = e.context.kind
 	b.server = servers.get(e.context.serverName)
-})
+}
 
-rpc.addEventListener('BufferStats', event => {
+rpcEventHandlers['BufferStats'] = e => {
-	let e = event.detail, b = buffers.get(e.bufferName)
+	let b = buffers.get(e.bufferName)
 	if (b === undefined)
 		return
 
 	b.newMessages = e.newMessages,
 	b.newUnimportantMessages = e.newUnimportantMessages
 	b.highlighted = e.highlighted
-})
+}
 
-rpc.addEventListener('BufferRename', event => {
+rpcEventHandlers['BufferRename'] = e => {
-	let e = event.detail
 	buffers.set(e.new, buffers.get(e.bufferName))
 	buffers.delete(e.bufferName)
-})
+}
 
-rpc.addEventListener('BufferRemove', event => {
+rpcEventHandlers['BufferRemove'] = e => {
-	let e = event.detail
 	buffers.delete(e.bufferName)
 	if (e.bufferName === bufferLast)
 		bufferLast = undefined
-})
+}
 
-rpc.addEventListener('BufferActivate', event => {
+rpcEventHandlers['BufferActivate'] = e => {
 	let old = buffers.get(bufferCurrent)
 	if (old !== undefined)
 		bufferResetStats(old)
 
 	bufferLast = bufferCurrent
-	let e = event.detail, b = buffers.get(e.bufferName)
+	let b = buffers.get(e.bufferName)
 	bufferCurrent = e.bufferName
 	bufferLog = undefined
 	bufferAutoscroll = true
@@ -328,11 +331,12 @@ rpc.addEventListener('BufferActivate', event => {
 		textarea.value = b.input
 		textarea.setSelectionRange(b.inputStart, b.inputEnd, b.inputDirection)
 	}
-})
+}
 
-rpc.addEventListener('BufferLine', event => {
+rpcEventHandlers['BufferLine'] = e => {
-	let e = event.detail, b = buffers.get(e.bufferName), line = {...e}
+	let b = buffers.get(e.bufferName), line = {...e}
 	delete line.event
+	delete line.eventSeq
 	delete line.leakToActive
 	if (b === undefined)
 		return
@@ -372,33 +376,31 @@ rpc.addEventListener('BufferLine', event => {
 		if (!visible)
 			b.highlighted = true
 	}
-})
+}
 
-rpc.addEventListener('BufferClear', event => {
+rpcEventHandlers['BufferClear'] = e => {
-	let e = event.detail, b = buffers.get(e.bufferName)
+	let b = buffers.get(e.bufferName)
 	if (b !== undefined)
 		b.lines.length = 0
-})
+}
 
 // ~~~ Server events ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-rpc.addEventListener('ServerUpdate', event => {
+rpcEventHandlers['ServerUpdate'] = e => {
-	let e = event.detail, s = servers.get(e.serverName)
+	let s = servers.get(e.serverName)
 	if (s === undefined)
 		servers.set(e.serverName, (s = {}))
 	s.state = e.state
-})
+}
 
-rpc.addEventListener('ServerRename', event => {
+rpcEventHandlers['ServerRename'] = e => {
-	let e = event.detail
 	servers.set(e.new, servers.get(e.serverName))
 	servers.delete(e.serverName)
-})
+}
 
-rpc.addEventListener('ServerRemove', event => {
+rpcEventHandlers['ServerRemove'] = e => {
-	let e = event.detail
 	servers.delete(e.serverName)
-})
+}
 
 // --- Colours -----------------------------------------------------------------
 

xP/xP.go

@@ -4,6 +4,7 @@
 package main
 
 import (
+	"bufio"
 	"context"
 	"encoding/binary"
 	"encoding/json"
@@ -16,7 +17,7 @@ import (
 	"os"
 	"time"
 
-	"golang.org/x/net/websocket"
+	"nhooyr.io/websocket"
 )
 
 var (
@@ -25,18 +26,62 @@ var (
 	addressWS      string
 )
 
-func clientToRelay(
+// -----------------------------------------------------------------------------
-	ctx context.Context, ws *websocket.Conn, conn net.Conn) bool {
+
-	var j string
+func relayReadJSON(r io.Reader) []byte {
-	if err := websocket.Message.Receive(ws, &j); err != nil {
+	var length uint32
-		log.Println("Command receive failed: " + err.Error())
+	if err := binary.Read(r, binary.BigEndian, &length); err != nil {
-		return false
+		log.Println("Event receive failed: " + err.Error())
+		return nil
+	}
+	b := make([]byte, length)
+	if _, err := io.ReadFull(r, b); err != nil {
+		log.Println("Event receive failed: " + err.Error())
+		return nil
 	}
 
-	log.Printf("?> %s\n", j)
+	log.Printf("<? %v\n", b)
 
+	var m RelayEventMessage
+	if after, ok := m.ConsumeFrom(b); !ok {
+		log.Println("Event deserialization failed")
+		return nil
+	} else if len(after) != 0 {
+		log.Println("Event deserialization failed: trailing data")
+		return nil
+	}
+
+	j, err := m.MarshalJSON()
+	if err != nil {
+		log.Println("Event marshalling failed: " + err.Error())
+		return nil
+	}
+	return j
+}
+
+func relayMakeReceiver(ctx context.Context, conn net.Conn) <-chan []byte {
+	p := make(chan []byte, 1)
+	r := bufio.NewReader(conn)
+	go func() {
+		defer close(p)
+		for {
+			j := relayReadJSON(r)
+			if j == nil {
+				return
+			}
+			select {
+			case p <- j:
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+	return p
+}
+
+func relayWriteJSON(conn net.Conn, j []byte) bool {
 	var m RelayCommandMessage
-	if err := json.Unmarshal([]byte(j), &m); err != nil {
+	if err := json.Unmarshal(j, &m); err != nil {
 		log.Println("Command unmarshalling failed: " + err.Error())
 		return false
 	}
@@ -56,46 +101,34 @@ func clientToRelay(
 	return true
 }
 
-func relayToClient(
+// -----------------------------------------------------------------------------
-	ctx context.Context, ws *websocket.Conn, conn net.Conn) bool {
-	var length uint32
-	if err := binary.Read(conn, binary.BigEndian, &length); err != nil {
-		log.Println("Event receive failed: " + err.Error())
-		return false
-	}
-	b := make([]byte, length)
-	if _, err := io.ReadFull(conn, b); err != nil {
-		log.Println("Event receive failed: " + err.Error())
-		return false
-	}
 
-	log.Printf("<? %v\n", b)
+func clientReadJSON(ctx context.Context, ws *websocket.Conn) []byte {
-
+	t, j, err := ws.Read(ctx)
-	var m RelayEventMessage
-	if after, ok := m.ConsumeFrom(b); !ok {
-		log.Println("Event deserialization failed")
-		return false
-	} else if len(after) != 0 {
-		log.Println("Event deserialization failed: trailing data")
-		return false
-	}
-
-	j, err := json.Marshal(&m)
 	if err != nil {
-		log.Println("Event marshalling failed: " + err.Error())
+		log.Println("Command receive failed: " + err.Error())
-		return false
+		return nil
 	}
-	if err := websocket.Message.Send(ws, string(j)); err != nil {
+	if t != websocket.MessageText {
+		log.Println(
+			"Command receive failed: " + "binary messages are not supported")
+		return nil
+	}
+	log.Printf("?> %s\n", j)
+	return j
+}
+
+func clientWriteJSON(ctx context.Context, ws *websocket.Conn, j []byte) bool {
+	if err := ws.Write(ctx, websocket.MessageText, j); err != nil {
 		log.Println("Event send failed: " + err.Error())
 		return false
 	}
-
 	log.Printf("<- %s\n", j)
 	return true
 }
 
-func errorToClient(ws *websocket.Conn, err error) bool {
+func clientWriteError(ctx context.Context, ws *websocket.Conn, err error) bool {
-	j, err := json.Marshal(&RelayEventMessage{
+	j, err := (&RelayEventMessage{
 		EventSeq: 0,
 		Data: RelayEventData{
 			Interface: RelayEventDataError{
@@ -104,40 +137,67 @@ func errorToClient(ws *websocket.Conn, err error) bool {
 				Error:      err.Error(),
 			},
 		},
-	})
+	}).MarshalJSON()
 	if err != nil {
 		log.Println("Event marshalling failed: " + err.Error())
 		return false
 	}
-	if err := websocket.Message.Send(ws, string(j)); err != nil {
+	return clientWriteJSON(ctx, ws, j)
-		log.Println("Event send failed: " + err.Error())
-		return false
-	}
-	return true
 }
 
-func handleWebSocket(ws *websocket.Conn) {
+func handleWS(w http.ResponseWriter, r *http.Request) {
-	conn, err := net.Dial("tcp", addressConnect)
+	ws, err := websocket.Accept(w, r, &websocket.AcceptOptions{
+		InsecureSkipVerify: true,
+		// Note that Safari can be broken with compression.
+		CompressionMode: websocket.CompressionContextTakeover,
+		// This is for the payload; set higher to avoid overhead.
+		CompressionThreshold: 64 << 10,
+	})
 	if err != nil {
-		errorToClient(ws, err)
+		log.Println("Client rejected: " + err.Error())
 		return
 	}
+	defer ws.Close(websocket.StatusGoingAway, "Goodbye")
+
+	ctx, cancel := context.WithCancel(r.Context())
+	defer cancel()
+
+	conn, err := net.Dial("tcp", addressConnect)
+	if err != nil {
+		clientWriteError(ctx, ws, err)
+		return
+	}
+	defer conn.Close()
 
 	// We don't need to intervene, so it's just two separate pipes so far.
-	ctx, cancel := context.WithCancel(ws.Request().Context())
+	// However, to decrease latencies, events are received and decoded
+	// in parallel to their sending.
+	relayJSON := relayMakeReceiver(ctx, conn)
 	go func() {
-		for clientToRelay(ctx, ws, conn) {
+		defer cancel()
+		for {
+			j := clientReadJSON(ctx, ws)
+			if j == nil {
+				return
+			}
+			relayWriteJSON(conn, j)
 		}
-		cancel()
 	}()
 	go func() {
-		for relayToClient(ctx, ws, conn) {
+		defer cancel()
+		for {
+			j, ok := <-relayJSON
+			if !ok {
+				return
+			}
+			clientWriteJSON(ctx, ws, j)
 		}
-		cancel()
 	}()
 	<-ctx.Done()
 }
 
+// -----------------------------------------------------------------------------
+
 var staticHandler = http.FileServer(http.Dir("."))
 
 var page = template.Must(template.New("/").Parse(`<!DOCTYPE html>
@@ -184,7 +244,7 @@ func main() {
 		addressWS = os.Args[3]
 	}
 
-	http.Handle("/ws", websocket.Handler(handleWebSocket))
+	http.Handle("/ws", http.HandlerFunc(handleWS))
 	http.Handle("/", http.HandlerFunc(handleDefault))
 
 	s := &http.Server{