Cleanup image handling and add metrics

Signed-off-by: Janne Mareike Koschinski <janne@kuschku.de>

go.mod

@@ -4,7 +4,9 @@ go 1.13
 
 require (
 	github.com/go-redis/redis v6.15.9+incompatible
+	github.com/justjanne/imgconv v1.0.3
 	github.com/onsi/ginkgo v1.14.2 // indirect
 	github.com/onsi/gomega v1.10.4 // indirect
+	github.com/prometheus/client_golang v1.11.0 // indirect
 	gopkg.in/gographics/imagick.v2 v2.6.0
 )

go.sum

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@@ -11,11 +35,39 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
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+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e h1:FDhOuMEY4JVRztM/gsbk+IKUQ8kj74bxZrgw87eMMVc=
 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=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -58,13 +164,21 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gographics/imagick.v2 v2.6.0 h1:ewRsUQk3QkjGumERlndbFn/kTYRjyMaPY5gxwpuAhik=
 gopkg.in/gographics/imagick.v2 v2.6.0/go.mod h1:/QVPLV/iKdNttRKthmDkeeGg+vdHurVEPc8zkU0XgBk=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

goroutine.go

+package main
+
+func readAllErrors(amount int, errorChannel chan error) []error {
+	errors := make([]error, 0)
+	for i := 0; i < amount; i++ {
+		err := <-errorChannel
+		if err != nil {
+			errors = append(errors, err)
+		}
+	}
+
+	return errors
+}
+
+func runMany(amount int, function func(index int) error) []error {
+	errorChannel := make(chan error)
+	for i := 0; i < amount; i++ {
+		index := i
+		go func() { errorChannel <- function(index) }()
+	}
+	return readAllErrors(amount, errorChannel)
+}

lib/colorspace.go

-package lib
-
-import "encoding/base64"
-
-var ColorspaceACESLinear, _ = base64.StdEncoding.DecodeString("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")
-var ColorspaceSRGB, _ = base64.StdEncoding.DecodeString("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")

lib/processImageInstance.go

-package lib
-
-import (
-	"gopkg.in/gographics/imagick.v2/imagick"
-	"strings"
-)
-
-func ProcessImageInstance(
-	wand *imagick.MagickWand,
-	size Size,
-	quality Quality,
-	parameters ImageParameters,
-	target string,
-) error {
-	var err error
-	var mw *imagick.MagickWand
-
-	mw = wand.Clone()
-	defer mw.Destroy()
-
-	if err = ResizeImageInstance(mw, size); err != nil {
-		return err
-	}
-	for _, key := range mw.GetImageProperties("*") {
-		if !strings.HasPrefix(key, "png:") {
-			if err = mw.DeleteImageProperty(key); err != nil {
-				return err
-			}
-		}
-	}
-
-	if iccProfile, iccProfileOk := parameters.profiles["icc"]; iccProfileOk {
-		err = mw.ProfileImage("icc", iccProfile)
-	} else if iptcProfile, iptcProfileOk := parameters.profiles["iptc"]; iptcProfileOk {
-		err = mw.ProfileImage("iptc", iptcProfile)
-	} else {
-		err = mw.TransformImageColorspace(parameters.colorspace)
-	}
-
-	if err = mw.SetImageDepth(parameters.depth); err != nil {
-		return err
-	}
-
-	if quality.CompressionQuality != 0 {
-		_ = mw.SetImageCompressionQuality(quality.CompressionQuality)
-	}
-
-	if len(quality.SamplingFactors) != 0 {
-		_ = mw.SetSamplingFactors(quality.SamplingFactors)
-	}
-
-	err = mw.WriteImage(target)
-
-	return err
-}

lib/resizeImage.go

-package lib
-
-import (
-	"fmt"
-	"gopkg.in/gographics/imagick.v2/imagick"
-	"path/filepath"
-)
-
-func goroutineWrapper(
-	errorChannel chan error,
-	wand *imagick.MagickWand,
-	config *Config, path string,
-	definition SizeDefinition,
-	parameters ImageParameters,
-) {
-	errorChannel <- ProcessImageInstance(
-		wand,
-		definition.Size,
-		config.Quality,
-		parameters,
-		path,
-	)
-}
-
-func ResizeImage(config *Config, imageId string) []error {
-	var err error
-	errorChannel := make(chan error)
-
-	wand := imagick.NewMagickWand()
-	defer wand.Destroy()
-
-	if err = wand.SetOption("png:include-chunk", "bKGD,cHRM,iCCP"); err != nil {
-		return []error{err}
-	}
-	if err = wand.SetOption("png:exclude-chunk", "EXIF,iTXt,tEXt,zTXt,date"); err != nil {
-		return []error{err}
-	}
-
-	if err = wand.ReadImage(filepath.Join(config.SourceFolder, imageId)); err != nil {
-		return []error{err}
-	}
-
-	_ = wand.AutoOrientImage()
-
-	if len(wand.GetImageProfiles("*")) == 0 {
-		if err = wand.SetImageProfile("icc", ColorspaceSRGB); err != nil {
-			return []error{err}
-		}
-	}
-
-	colorSpace := wand.GetImageColorspace()
-	if colorSpace == imagick.COLORSPACE_UNDEFINED {
-		colorSpace = imagick.COLORSPACE_SRGB
-	}
-
-	profiles := map[string][]byte{}
-	for _, name := range wand.GetImageProfiles("*") {
-		profiles[name] = []byte(wand.GetImageProfile(name))
-	}
-
-	parameters := ImageParameters{
-		depth:      wand.GetImageDepth(),
-		profiles:   profiles,
-		colorspace: colorSpace,
-	}
-
-	if err = wand.SetImageDepth(16); err != nil {
-		panic(err)
-	}
-	if err = wand.ProfileImage("icc", ColorspaceACESLinear); err != nil {
-		panic(err)
-	}
-
-	for _, definition := range config.Sizes {
-		path := filepath.Join(config.TargetFolder, fmt.Sprintf("%s%s", imageId, definition.Suffix))
-		go goroutineWrapper(errorChannel, wand, config, path, definition, parameters)
-	}
-
-	errors := make([]error, 0)
-	for i := 0; i < len(config.Sizes); i++ {
-		err := <-errorChannel
-		if err != nil {
-			errors = append(errors, err)
-		}
-	}
-
-	return errors
-}

lib/resizeImageInstance.go

-package lib
-
-import (
-	"errors"
-	"fmt"
-	"gopkg.in/gographics/imagick.v2/imagick"
-	"math"
-)
-
-func ResizeImageInstance(mw *imagick.MagickWand, size Size) error {
-	var err error
-	if size.Width != 0 || size.Height != 0 {
-		width := mw.GetImageWidth()
-		height := mw.GetImageHeight()
-
-		aspectRatio := float64(width) / float64(height)
-
-		var nWidth, nHeight uint
-		if size.Height != 0 && size.Width != 0 {
-			if size.Format == sizeFormatContain {
-				if aspectRatio > 1 {
-					nWidth = uint(math.Min(float64(size.Width), float64(width)))
-					nHeight = uint(math.Round(float64(nWidth) / aspectRatio))
-				} else {
-					nHeight = uint(math.Min(float64(size.Height), float64(height)))
-					nWidth = uint(math.Round(aspectRatio * float64(nHeight)))
-				}
-			} else if size.Format == sizeFormatCover {
-				var targetAspectRatio = float64(size.Width) / float64(size.Height)
-				var cWidth, cHeight uint
-				if targetAspectRatio > aspectRatio {
-					cWidth = width
-					cHeight = uint(math.Round(float64(width) / targetAspectRatio))
-				} else {
-					cHeight = height
-					cWidth = uint(math.Round(targetAspectRatio * float64(height)))
-				}
-
-				dx := int((width - cWidth) / 2)
-				dy := int((height - cHeight) / 2)
-
-				if err = mw.CropImage(cWidth, cHeight, dx, dy); err != nil {
-					return err
-				}
-
-				nHeight = uint(math.Min(float64(size.Height), float64(cHeight)))
-				nWidth = uint(math.Min(float64(size.Width), float64(cWidth)))
-			} else {
-				return errors.New(fmt.Sprintf("Format type not recognized: %s", size.Format))
-			}
-		} else if size.Height != 0 {
-			nHeight = uint(math.Min(float64(size.Height), float64(height)))
-			nWidth = uint(math.Round(aspectRatio * float64(nHeight)))
-		} else if size.Width != 0 {
-			nWidth = uint(math.Min(float64(size.Width), float64(width)))
-			nHeight = uint(math.Round(float64(nWidth) / aspectRatio))
-		} else {
-			nWidth = width
-			nHeight = height
-		}
-
-		if (width != nWidth) || (height != nHeight) {
-			if err = mw.ResizeImage(nWidth, nHeight, imagick.FILTER_LANCZOS, 1); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}

main.go

 package main
 
 import (
-	"encoding/json"
-	"fmt"
-	"git.kuschku.de/justjanne/imghost/lib"
 	"github.com/go-redis/redis"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"gopkg.in/gographics/imagick.v2/imagick"
 	"net/http"
-	"os"
-	"path/filepath"
-	"time"
 )
 
-func returnResult(config *lib.Config, client *redis.Client, result lib.Result) {
-	raw, err := json.Marshal(result)
-	if err != nil {
-		panic(err)
-	}
-	client.Publish(config.ResultChannel, string(raw))
-}
-
-func processImage(config *lib.Config, client *redis.Client, value string) {
-	image := lib.Image{}
-	if err := json.Unmarshal([]byte(value), &image); err != nil {
-		panic(err)
-	}
-	fmt.Printf("Received task %s at %d\n", image.Id, time.Now().Unix())
-
-	errors := lib.ResizeImage(config, image.Id)
-	_ = os.Remove(filepath.Join(config.SourceFolder, image.Id))
+var queueGauge = promauto.NewGauge(prometheus.GaugeOpts{
+	Name: "imghost_waiting_images",
+	Help: "The number of waiting image events",
+	ConstLabels: map[string]string{
+		"state": "queued",
+	},
+})
 
-	errorMessages := make([]string, len(errors))
-	for i, err := range errors {
-		errorMessages[i] = err.Error()
-	}
+var inProgressGauge = promauto.NewGauge(prometheus.GaugeOpts{
+	Name: "imghost_waiting_images",
+	Help: "The number of image events in progress",
+	ConstLabels: map[string]string{
+		"state": "in_progress",
+	},
+})
 
-	fmt.Printf("Finished task %s at %d\n", image.Id, time.Now().Unix())
+var imageCounterSuccess = promauto.NewCounter(prometheus.CounterOpts{
+	Name: "imghost_processed_images_total",
+	Help: "The total number of successfully processed image events",
+	ConstLabels: map[string]string{
+		"success": "true",
+	},
+})
 
-	if len(errors) != 0 {
-		returnResult(config, client, lib.Result{
-			Id:      image.Id,
-			Success: false,
-			Errors:  errorMessages,
+var imageCounterFailure = promauto.NewCounter(prometheus.CounterOpts{
+	Name: "imghost_processed_images_total",
+	Help: "The total number of errored image events",
+	ConstLabels: map[string]string{
+		"success": "false",
+	},
 })
-	} else {
-		returnResult(config, client, lib.Result{
-			Id:      image.Id,
-			Success: true,
+
+var imageProcessDuration = promauto.NewCounter(prometheus.CounterOpts{
+	Name: "imghost_process_duration",
+	Help: "The total amount of time spent processing images",
 })
-	}
-}
 
 func main() {
-	go func() {
-		config := lib.NewConfigFromEnv()
+	config := NewConfigFromEnv()
 
 	imagick.Initialize()
 	defer imagick.Terminate()
@@ -63,20 +57,17 @@ func main() {
 		Password: config.Redis.Password,
 	})
 
-		for {
-			element := client.BLPop(0, fmt.Sprintf("queue:%s", config.ImageQueue))
-			if len(element.Val()) == 2 {
-				value := element.Val()[1]
-				go processImage(&config, client, value)
-			}
-		}
-	}()
-
+	http.Handle("/metrics", promhttp.Handler())
 	http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		_, _ = w.Write([]byte("OK"))
 	})
 
-	if err := http.ListenAndServe(":8080", nil); err != nil {
+	go serveQueue(client, config.ImageQueue, func(value string) {
+		queueGauge.Dec()
+		inProgressGauge.Inc()
+		ProcessImage(&config, client, value)
+	})
+	if err := http.ListenAndServe(":2112", nil); err != nil {
 		panic(err)
 	}
 }

process.go

+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/go-redis/redis"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+func trackTime(start time.Time, function func(time.Duration)) {
+	function(time.Now().UTC().Sub(start.UTC()))
+}
+
+func ProcessImage(config *Config, client *redis.Client, value string) {
+	inProgressGauge.Inc()
+	defer inProgressGauge.Dec()
+	defer trackTime(time.Now(), func(duration time.Duration) {
+		imageProcessDuration.Add(float64(duration.Milliseconds()))
+	})
+
+	image := Image{}
+	if err := json.Unmarshal([]byte(value), &image); err != nil {
+		fmt.Printf("Could not unmarshal task %s\n", value)
+		return
+	}
+
+	errors := ResizeImage(config, image.Id)
+	_ = os.Remove(filepath.Join(config.SourceFolder, image.Id))
+
+	errorMessages := make([]string, len(errors))
+	for i, err := range errors {
+		errorMessages[i] = err.Error()
+	}
+
+	if len(errors) != 0 {
+		imageCounterFailure.Inc()
+		returnResult(config, client, Result{
+			Id:      image.Id,
+			Success: false,
+			Errors:  errorMessages,
+		})
+	} else {
+		imageCounterSuccess.Inc()
+		returnResult(config, client, Result{
+			Id:      image.Id,
+			Success: true,
+		})
+	}
+}

redis.go

+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/go-redis/redis"
+)
+
+func serveQueue(client *redis.Client, queue string, function func(value string)) {
+	for {
+		element := client.BLPop(0, fmt.Sprintf("queue:%s", queue))
+		if len(element.Val()) == 2 {
+			value := element.Val()[1]
+			queueGauge.Inc()
+			go function(value)
+		}
+	}
+}
+
+func returnResult(config *Config, client *redis.Client, result Result) {
+	raw, err := json.Marshal(result)
+	if err != nil {
+		panic(err)
+	}
+	client.Publish(config.ResultChannel, string(raw))
+}

resize.go

+package main
+
+import (
+	"fmt"
+	"github.com/justjanne/imgconv"
+	"gopkg.in/gographics/imagick.v2/imagick"
+	"path/filepath"
+)
+
+func ResizeImage(config *Config, imageId string) []error {
+	var err error
+
+	wand := imagick.NewMagickWand()
+	defer wand.Destroy()
+
+	if err = wand.ReadImage(filepath.Join(config.SourceFolder, imageId)); err != nil {
+		return []error{err}
+	}
+	var originalImage imgconv.ImageHandle
+	if originalImage, err = imgconv.NewImage(wand); err != nil {
+		return []error{err}
+	}
+
+	return runMany(len(config.Sizes), func(index int) error {
+		definition := config.Sizes[index]
+		path := filepath.Join(config.TargetFolder, fmt.Sprintf("%s%s", imageId, definition.Suffix))
+		image := originalImage.CloneImage()
+		if err := image.Crop(definition.Size); err != nil {
+			return err
+		}
+		if err := image.Resize(definition.Size); err != nil {
+			return err
+		}
+		if err := image.Write(config.Quality, path); err != nil {
+			return err
+		}
+		return nil
+	})
+}

lib/types.go → types.go

-package lib
+package main
 
 import (
 	"encoding/json"
-	"gopkg.in/gographics/imagick.v2/imagick"
+	"github.com/justjanne/imgconv"
 	"os"
 	"time"
 )
@@ -16,36 +16,14 @@ type Image struct {
 	MimeType     string `json:"mime_type"`
 }
 
-type ImageParameters struct {
-	profiles   map[string][]byte
-	colorspace imagick.ColorspaceType
-	depth      uint
-}
-
 type Result struct {
 	Id      string   `json:"id"`
 	Success bool     `json:"success"`
 	Errors  []string `json:"errors"`
 }
 
-type Size struct {
-	Width  uint   `json:"width"`
-	Height uint   `json:"height"`
-	Format string `json:"format"`
-}
-
-const (
-	sizeFormatCover   = "cover"
-	sizeFormatContain = "contain"
-)
-
-type Quality struct {
-	CompressionQuality uint      `json:"compression_quality"`
-	SamplingFactors    []float64 `json:"sampling_factors"`
-}
-
 type SizeDefinition struct {
-	Size   Size   `json:"size"`
+	Size   imgconv.Size `json:"size"`
 	Suffix string       `json:"suffix"`
 }
 
@@ -61,7 +39,7 @@ type DatabaseConfig struct {
 
 type Config struct {
 	Sizes         []SizeDefinition
-	Quality       Quality
+	Quality       imgconv.Quality
 	SourceFolder  string
 	TargetFolder  string
 	Redis         RedisConfig