WIP: add tile updating in in web mapper with pg listen/notify

cmd/mtwebmapper/main.go

@@ -10,6 +10,7 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"time"
 
 	"bitbucket.org/s_l_teichmann/mtsatellite/common"
 
@@ -35,6 +36,7 @@ func main() {
 		version        bool
 		yMin           int
 		yMax           int
+		changeDuration time.Duration
 	)
 
 	defaultBgColor := common.ColorToHex(common.BackgroundColor)
@@ -74,6 +76,7 @@ func main() {
 	flag.StringVar(&playersFIFO, "ps", "", "Path to FIFO file to read active players from (shorthand).")
 	flag.IntVar(&yMin, "ymin", common.MinHeight, "Minimum y in blocks.")
 	flag.IntVar(&yMax, "ymax", common.MaxHeight, "Maximum y in blocks.")
+	flag.CommandLine.DurationVar(&changeDuration, "change-duration", time.Second, "Duration to aggregate changes. (PG only)")
 	flag.BoolVar(&version, "version", false, "Print version and exit.")
 
 	flag.Parse()
@@ -132,8 +135,13 @@ func main() {
 			workers,
 			btu)
 		go tu.doUpdates()
+
+		if pgHost, ok := common.IsPostgreSQL(redisHost); btu != nil && ok {
+			go tu.listen(pgHost, changeDuration)
+		} else {
 			router.Path("/update").Methods("POST").Handler(tu)
 		}
+	}
 
 	router.PathPrefix("/").Handler(http.FileServer(http.Dir(webDir)))
 	http.Handle("/", router)

cmd/mtwebmapper/tilesupdater.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"image"
 	"image/color"
@@ -16,8 +17,10 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/bamiaux/rez"
+	"github.com/jackc/pgx/v4"
 
 	"bytes"
 
@@ -131,6 +134,60 @@ func (tu *tileUpdater) checkIP(r *http.Request) bool {
 	return false
 }
 
+func (tu *tileUpdater) listen(host string, changeDuration time.Duration) {
+
+	xzCh := make(chan xz)
+
+	go func() {
+		ctx := context.Background()
+
+		conn, err := pgx.Connect(ctx, host)
+		if err != nil {
+			log.Printf("error: %v\n", err)
+			return
+		}
+		defer conn.Close(ctx)
+
+		if _, err := conn.Exec(ctx, "listen blockchanges"); err != nil {
+			log.Printf("error: %v\n", err)
+			return
+		}
+
+		for {
+			n, err := conn.WaitForNotification(ctx)
+			if err != nil {
+				log.Printf("error: %v\n", err)
+				continue
+			}
+			if n.Payload == "" {
+				continue
+			}
+			var c xz
+			dec := json.NewDecoder(strings.NewReader(n.Payload))
+			if err := dec.Decode(&c); err != nil {
+				log.Printf("error: %v\n", err)
+				continue
+			}
+			xzCh <- c
+		}
+	}()
+
+	ticker := time.NewTicker(changeDuration)
+	defer ticker.Stop()
+
+	var changes []xz
+
+	for {
+		select {
+		case c := <-xzCh:
+			changes = append(changes, c)
+		case <-ticker.C:
+			tu.sendChanges(changes)
+			changes = changes[:0]
+		}
+	}
+}
+
 func (tu *tileUpdater) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 	if !tu.checkIP(r) {
 		log.Printf("WARN: Unauthorized update request from '%s'\n", r.RemoteAddr)
@@ -147,18 +204,23 @@ func (tu *tileUpdater) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if len(newChanges) > 0 {
+	tu.sendChanges(newChanges)
+
+	rw.WriteHeader(http.StatusOK)
+}
+
+func (tu *tileUpdater) sendChanges(changes []xz) {
+	if len(changes) == 0 {
+		return
+	}
 	tu.cond.L.Lock()
-		for _, c := range newChanges {
+	for _, c := range changes {
 		tu.changes[c.quantize()] = struct{}{}
 	}
 	tu.cond.L.Unlock()
 	tu.cond.Signal()
 }
 
-	rw.WriteHeader(http.StatusOK)
-}
-
 func extractChanges(changes map[xz]struct{}) []xzc {
 	chs := make([]xzc, len(changes))
 	var i int

common/clientfactory.go

@@ -11,10 +11,16 @@ import (
 
 type DBClientCreator func() (DBClient, error)
 
+func IsPostgreSQL(host string) (string, bool) {
+	if strings.HasPrefix(host, "postgres:") {
+		return host[len("postgres:"):], true
+	}
+	return "", false
+}
+
 func CreateDBClientCreator(host string, port int) DBClientCreator {
 
-	if strings.HasPrefix(host, "postgres:") {
+	if host, ok := IsPostgreSQL(host); ok {
-		host = host[len("postgres:"):]
 		return func() (DBClient, error) {
 			return NewPGClient(host)
 		}

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/bamiaux/rez v0.0.0-20170731184118-29f4463c688b
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.5.0
-	github.com/jackc/pgx/v4 v4.15.0 // indirect
+	github.com/jackc/pgx/v4 v4.15.0
 	github.com/jmhodges/levigo v1.0.0
 	github.com/mattn/go-sqlite3 v1.14.11
 	golang.org/x/crypto v0.0.0-20220214200702-86341886e292

go.sum

@@ -1,24 +1,24 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/Masterminds/semver/v3 v3.1.1 h1:hLg3sBzpNErnxhQtUy/mmLR2I9foDujNK030IGemrRc=
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 github.com/bamiaux/rez v0.0.0-20170731184118-29f4463c688b h1:5Ci5wpOL75rYF6RQGRoqhEAU6xLJ6n/D4SckXX1yB74=
 github.com/bamiaux/rez v0.0.0-20170731184118-29f4463c688b/go.mod h1:obBQGGIFbbv9KWg92Qu9UHeD94JXmHD1jovY/z6I3O8=
+github.com/cockroachdb/apd v1.1.0 h1:3LFP3629v+1aKXU5Q37mxmRxX/pIu1nijXydLShEq5I=
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 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
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+github.com/gofrs/uuid v4.0.0+incompatible h1:1SD/1F5pU8p29ybwgQSwpQk+mwdRrXCYuPhW6m+TnJw=
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-github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
-github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
-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/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0=
@@ -38,6 +38,7 @@ github.com/jackc/pgio v1.0.0 h1:g12B9UwVnzGhueNavwioyEEpAmqMe1E/BN9ES+8ovkE=
 github.com/jackc/pgio v1.0.0/go.mod h1:oP+2QK2wFfUWgr+gxjoBH9KGBb31Eio69xUb0w5bYf8=
 github.com/jackc/pgmock v0.0.0-20190831213851-13a1b77aafa2/go.mod h1:fGZlG77KXmcq05nJLRkk0+p82V8B8Dw8KN2/V9c/OAE=
 github.com/jackc/pgmock v0.0.0-20201204152224-4fe30f7445fd/go.mod h1:hrBW0Enj2AZTNpt/7Y5rr2xe/9Mn757Wtb2xeBzPv2c=
+github.com/jackc/pgmock v0.0.0-20210724152146-4ad1a8207f65 h1:DadwsjnMwFjfWc9y5Wi/+Zz7xoE5ALHsRQlOctkOiHc=
 github.com/jackc/pgmock v0.0.0-20210724152146-4ad1a8207f65/go.mod h1:5R2h2EEX+qri8jOWMbJCtaPWkrrNc7OHwsp2TCqp7ak=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
@@ -74,24 +75,27 @@ github.com/jmhodges/levigo v1.0.0/go.mod h1:Q6Qx+uH3RAqyK4rFQroq9RL7mdkABMcfhEI+
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 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
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+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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@@ -99,6 +103,7 @@ github.com/rs/zerolog v1.13.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OK
 github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc=
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+github.com/shopspring/decimal v1.2.0 h1:abSATXmQEYyShuxI4/vyW3tV1MrKAJzCZ/0zLUXYbsQ=
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@@ -109,6 +114,7 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
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@@ -127,8 +133,6 @@ golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaE
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20191128160524-b544559bb6d1 h1:anGSYQpPhQwXlwsu5wmfq0nWkCNaMEMUwAv13Y92hd8=
-golang.org/x/crypto v0.0.0-20191128160524-b544559bb6d1/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
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@@ -149,7 +153,6 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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-golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
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 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -184,9 +187,11 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=