chore: introduce hashes for heartbeats

coverage/coverage.out

@@ -1,4 +1,9 @@
 mode: set
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@@ -17,26 +22,6 @@ github.com/muety/wakapi/models/filters.go:39.8,39.27 1 1
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@@ -54,6 +39,41 @@ github.com/muety/wakapi/models/shared.go:74.51,77.2 2 0
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@@ -104,25 +124,6 @@ github.com/muety/wakapi/models/summary.go:236.11,244.6 1 1
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@@ -205,46 +206,13 @@ github.com/muety/wakapi/utils/date.go:71.2,71.13 1 0
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-github.com/muety/wakapi/services/language_mapping.go:75.74,78.2 1 0
 github.com/muety/wakapi/services/misc.go:23.126,30.2 1 0
 github.com/muety/wakapi/services/misc.go:42.50,44.48 1 0
 github.com/muety/wakapi/services/misc.go:48.2,50.19 3 0
@@ -494,30 +422,81 @@ github.com/muety/wakapi/services/summary.go:324.54,326.3 1 1
 github.com/muety/wakapi/services/summary.go:331.59,333.25 2 1
 github.com/muety/wakapi/services/summary.go:336.2,336.32 1 1
 github.com/muety/wakapi/services/summary.go:333.25,335.3 1 1
-github.com/muety/wakapi/services/user.go:19.73,25.2 1 0
+github.com/muety/wakapi/services/heartbeat.go:17.141,23.2 1 0
-github.com/muety/wakapi/services/user.go:27.74,28.40 1 0
+github.com/muety/wakapi/services/heartbeat.go:25.80,27.2 1 0
-github.com/muety/wakapi/services/user.go:32.2,33.16 2 0
+github.com/muety/wakapi/services/heartbeat.go:29.111,31.16 2 0
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+github.com/muety/wakapi/services/aggregation.go:136.9,136.62 1 0
+github.com/muety/wakapi/services/aggregation.go:136.62,140.4 1 0
+github.com/muety/wakapi/services/aggregation.go:148.83,163.41 5 0
+github.com/muety/wakapi/services/aggregation.go:163.41,173.3 3 0
+github.com/muety/wakapi/services/aggregation.go:176.34,179.2 2 0
 github.com/muety/wakapi/services/alias.go:17.77,22.2 1 1
 github.com/muety/wakapi/services/alias.go:26.60,27.43 1 1
 github.com/muety/wakapi/services/alias.go:30.2,30.14 1 1
@@ -553,3 +532,27 @@ github.com/muety/wakapi/services/alias.go:95.21,97.4 1 0
 github.com/muety/wakapi/services/alias.go:104.31,106.3 1 0
 github.com/muety/wakapi/services/alias.go:111.52,112.51 1 0
 github.com/muety/wakapi/services/alias.go:112.51,114.3 1 0
+github.com/muety/wakapi/services/user.go:19.73,25.2 1 0
+github.com/muety/wakapi/services/user.go:27.74,28.40 1 0
+github.com/muety/wakapi/services/user.go:32.2,33.16 2 0
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+github.com/muety/wakapi/services/user.go:46.2,47.16 2 0
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+github.com/muety/wakapi/services/user.go:96.106,99.96 3 0
+github.com/muety/wakapi/services/user.go:104.2,104.68 1 0
+github.com/muety/wakapi/services/user.go:99.96,101.3 1 0
+github.com/muety/wakapi/services/user.go:101.8,103.3 1 0

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/markbates/pkger v0.17.1
 	github.com/mattn/go-sqlite3 v2.0.3+incompatible // indirect
+	github.com/mitchellh/hashstructure/v2 v2.0.1
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/rubenv/sql-migrate v0.0.0-20200402132117-435005d389bc

go.sum

@@ -273,6 +273,9 @@ github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-testing-interface v1.0.0/go.mod h1:kRemZodwjscx+RGhAo8eIhFbs2+BFgRtFPeD/KE+zxI=
 github.com/mitchellh/gox v0.4.0/go.mod h1:Sd9lOJ0+aimLBi73mGofS1ycjY8lL3uZM3JPS42BGNg=
+github.com/mitchellh/hashstructure v1.1.0 h1:P6P1hdjqAAknpY/M1CGipelZgp+4y9ja9kmUZPXP+H0=
+github.com/mitchellh/hashstructure/v2 v2.0.1 h1:L60q1+q7cXE4JeEJJKMnh2brFIe3rZxCihYAB61ypAY=
+github.com/mitchellh/hashstructure/v2 v2.0.1/go.mod h1:MG3aRVU/N29oo/V/IhBX8GR/zz4kQkprJgF2EVszyDE=
 github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY=
 github.com/mitchellh/mapstructure v0.0.0-20160808181253-ca63d7c062ee/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=

models/heartbeat.go

@@ -1,6 +1,9 @@
 package models
 
 import (
+	"fmt"
+	"github.com/emvi/logbuch"
+	"github.com/mitchellh/hashstructure/v2"
 	"regexp"
 	"time"
 )
@@ -20,6 +23,7 @@ type Heartbeat struct {
 	OperatingSystem string     `json:"operating_system"`
 	Machine         string     `json:"machine"`
 	Time            CustomTime `json:"time" gorm:"type:timestamp; default:CURRENT_TIMESTAMP; index:idx_time,idx_time_user"`
+	Hash            string     `json:"-" gorm:"type:varchar(17); uniqueIndex"`
 	languageRegex   *regexp.Regexp
 }
 
@@ -62,3 +66,18 @@ func (h *Heartbeat) GetKey(t uint8) (key string) {
 
 	return key
 }
+
+// Hash is used to prevent duplicate heartbeats
+// Using a UNIQUE INDEX over all relevant columns would be more straightforward,
+// whereas manually computing this kind of hash is quite cumbersome. However,
+// such a unique index would, according to https://stackoverflow.com/q/65980064/3112139,
+// essentially double the space required for heartbeats, so we decided to go this way.
+
+func (h *Heartbeat) Hashed() *Heartbeat {
+	hash, err := hashstructure.Hash(h, hashstructure.FormatV2, nil)
+	if err != nil {
+		logbuch.Error("CRITICAL ERROR: failed to hash struct – %v", err)
+	}
+	h.Hash = fmt.Sprintf("%x", hash) // "uint64 values with high bit set are not supported"
+	return h
+}

routes/heartbeat.go

@@ -62,6 +62,8 @@ func (h *HeartbeatHandler) ApiPost(w http.ResponseWriter, r *http.Request) {
 			w.Write([]byte("Invalid heartbeat object."))
 			return
 		}
+
+		hb.Hashed()
 	}
 
 	if err := h.heartbeatSrvc.InsertBatch(heartbeats); err != nil {