Issue37 Wrap errors by calling fmt.Errorf and apply the %w verb to th…

…e error argument

* go1.13 is required
* Removed download target

.gitignore

@@ -1,2 +1 @@
-vendor/*
 build/*

.travis.yml

@@ -1,12 +1,11 @@
 language: go
 
 go:
- - "1.12.x"
+ - "1.13.x"
 
 script:
-  - env GO111MODULE=on make download
-  - env GO111MODULE=on make test
   - make vet
+  - make test
 
 notifications:
   email:

Makefile

@@ -2,7 +2,7 @@
 
 .PHONY: build test vet clean
 
-BUILD_FLAGS = -mod=vendor $(GO_BUILD_FLAGS)
+BUILD_FLAGS = $(GO_BUILD_FLAGS)
 
 default: build
 
@@ -15,19 +15,15 @@ build-lm:
 build-spellchecker:
 	go build $(BUILD_FLAGS) -o build/spellchecker ./cmd/spellchecker/
 
-build: download test vet build-suggest build-lm build-spellchecker
-build-bin: download build-suggest build-lm
+build: test vet build-suggest build-lm build-spellchecker
+build-bin: build-suggest build-lm
 
 build-docker:
 	docker build --no-cache -t suggest:latest .
 
 test:
 	go test -race -v ./...
 
-download:
-	go mod download
-	go mod vendor
-
 vet:
 	go vet ./...
 

cmd/language-model/cmd/build-lm.go

@@ -19,13 +19,13 @@ var buildLMCmd = &cobra.Command{
 		config, err := lm.ReadConfig(configPath)
 
 		if err != nil {
-			return fmt.Errorf("couldn't read a config %v", err)
+			return fmt.Errorf("couldn't read a config %w", err)
 		}
 
 		directory, err := store.NewFSDirectory(config.GetOutputPath())
 
 		if err != nil {
-			return fmt.Errorf("failed to create a fs directory: %v", err)
+			return fmt.Errorf("failed to create a fs directory: %w", err)
 		}
 
 		return lm.StoreBinaryLMFromGoogleFormat(directory, config)

cmd/language-model/cmd/eval.go

@@ -23,13 +23,13 @@ var evalCmd = &cobra.Command{
 		config, err := lm.ReadConfig(configPath)
 
 		if err != nil {
-			return fmt.Errorf("failed to read config file: %v", err)
+			return fmt.Errorf("failed to read config file: %w", err)
 		}
 
 		directory, err := store.NewFSDirectory(config.GetOutputPath())
 
 		if err != nil {
-			return fmt.Errorf("failed to create a fs directory: %v", err)
+			return fmt.Errorf("failed to create a fs directory: %w", err)
 		}
 
 		languageModel, err := lm.RetrieveLMFromBinary(directory, config)

cmd/language-model/cmd/ngram-count.go

@@ -22,7 +22,7 @@ var countNGramsCmd = &cobra.Command{
 		config, err := lm.ReadConfig(configPath)
 
 		if err != nil {
-			return fmt.Errorf("could read config %s", err)
+			return fmt.Errorf("could read config %w", err)
 		}
 
 		trie, err := buildNGramsCount(config)
@@ -40,7 +40,7 @@ func buildNGramsCount(config *lm.Config) (lm.CountTrie, error) {
 	sourceFile, err := os.Open(config.GetSourcePath())
 
 	if err != nil {
-		return nil, fmt.Errorf("could read source file %s", err)
+		return nil, fmt.Errorf("could read source file %w", err)
 	}
 
 	defer sourceFile.Close()
@@ -64,13 +64,13 @@ func storeNGramsCount(config *lm.Config, trie lm.CountTrie) error {
 	directory, err := store.NewFSDirectory(config.GetOutputPath())
 
 	if err != nil {
-		return fmt.Errorf("failed to create a fs directory: %v", err)
+		return fmt.Errorf("failed to create a fs directory: %w", err)
 	}
 
 	writer := lm.NewGoogleNGramWriter(config.NGramOrder, directory)
 
 	if err := writer.Write(trie); err != nil {
-		return fmt.Errorf("could save ngrams %s", err)
+		return fmt.Errorf("could save ngrams %w", err)
 	}
 
 	return nil

cmd/spellchecker/cmd/eval.go

@@ -39,7 +39,7 @@ var evalCmd = &cobra.Command{
 		config, err := lm.ReadConfig(configPath)
 
 		if err != nil {
-			return fmt.Errorf("failed to read config file: %v", err)
+			return fmt.Errorf("failed to read config file: %w", err)
 		}
 
 		service, err := dep.BuildSpellChecker(config, indexDescription)

cmd/suggest/cmd/eval.go

@@ -82,7 +82,7 @@ func configureService() (*suggest.Service, error) {
 	description, err := suggest.ReadConfigs(configPath)
 
 	if err != nil {
-		return nil, fmt.Errorf("Failed to read configs: %v", err)
+		return nil, fmt.Errorf("Failed to read configs: %w", err)
 	}
 
 	suggestService := suggest.NewService()

cmd/suggest/cmd/indexer.go

@@ -89,7 +89,7 @@ func readConfigs() ([]suggest.IndexDescription, error) {
 	configs, err := suggest.ReadConfigs(configPath)
 
 	if err != nil {
-		return nil, fmt.Errorf("invalid config file format %s", err)
+		return nil, fmt.Errorf("invalid config file format %w", err)
 	}
 
 	return configs, nil
@@ -111,7 +111,7 @@ func indexJob(description suggest.IndexDescription) error {
 	dict, err := buildDictionaryJob(description)
 
 	if err != nil {
-		return fmt.Errorf("failed to build a dictionary: %v", err)
+		return fmt.Errorf("failed to build a dictionary: %w", err)
 	}
 
 	log.Printf("Time spent %s", time.Since(start))
@@ -123,7 +123,7 @@ func indexJob(description suggest.IndexDescription) error {
 	directory, err := store.NewFSDirectory(description.GetIndexPath())
 
 	if err != nil {
-		return fmt.Errorf("failed to create a directory: %v", err)
+		return fmt.Errorf("failed to create a directory: %w", err)
 	}
 
 	if err = suggest.Index(directory, dict, description.GetWriterConfig(), description.GetIndexTokenizer()); err != nil {
@@ -179,7 +179,7 @@ func newDictionaryReader(config suggest.IndexDescription) (dictionary.Iterable,
 	f, err := os.Open(config.GetSourcePath())
 
 	if err != nil {
-		return nil, fmt.Errorf("could not open a source file %s", err)
+		return nil, fmt.Errorf("could not open a source file %w", err)
 	}
 
 	scanner := bufio.NewScanner(f)
@@ -194,17 +194,17 @@ func tryToSendReindexSignal() error {
 	d, err := ioutil.ReadFile(pidPath)
 
 	if err != nil {
-		return fmt.Errorf("error parsing pid from %s: %s", pidPath, err)
+		return fmt.Errorf("error parsing pid from %s: %w", pidPath, err)
 	}
 
 	pid, err := strconv.Atoi(string(bytes.TrimSpace(d)))
 
 	if err != nil {
-		return fmt.Errorf("error parsing pid from %s: %s", pidPath, err)
+		return fmt.Errorf("error parsing pid from %s: %w", pidPath, err)
 	}
 
 	if err := syscall.Kill(pid, syscall.SIGHUP); err != nil {
-		return fmt.Errorf("fail to send reindex signal to %d, %s", pid, err)
+		return fmt.Errorf("fail to send reindex signal to %d, %w", pid, err)
 	}
 
 	return nil
@@ -215,14 +215,14 @@ func tryToSendReindexRequest() error {
 	resp, err := http.Post(host, "text/plain", nil)
 
 	if err != nil {
-		return fmt.Errorf("fail to send reindex request to %s, %s", host, err)
+		return fmt.Errorf("fail to send reindex request to %s, %w", host, err)
 	}
 
 	defer resp.Body.Close()
 	body, err := ioutil.ReadAll(resp.Body)
 
 	if err != nil {
-		return fmt.Errorf("fail to read response body %s", err)
+		return fmt.Errorf("fail to read response body %w", err)
 	}
 
 	if string(body) != "OK" {

go.mod

@@ -6,14 +6,12 @@ require (
 	github.com/RoaringBitmap/roaring v0.4.20
 	github.com/alldroll/cdb v1.0.2
 	github.com/alldroll/go-datastructures v0.0.0-20190322060030-1d3a19ff3b29
-	github.com/djimenez/iconv-go v0.0.0-20160305225143-8960e66bd3da
 	github.com/edsrzf/mmap-go v0.0.0-20190108065903-904c4ced31cd
 	github.com/gorilla/handlers v1.4.0
 	github.com/gorilla/mux v1.7.1
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/spf13/cobra v0.0.3
 	github.com/spf13/pflag v1.0.3 // indirect
-	golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/sys v0.0.0-20190426135247-a129542de9ae // indirect
 )

go.sum

@@ -6,8 +6,6 @@ github.com/alldroll/go-datastructures v0.0.0-20190322060030-1d3a19ff3b29 h1:gKZg
 github.com/alldroll/go-datastructures v0.0.0-20190322060030-1d3a19ff3b29/go.mod h1:3IP5cUVnXIyZIsUbKXztqoz1brdOXngjFyYtmwqz9MY=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/djimenez/iconv-go v0.0.0-20160305225143-8960e66bd3da h1:0qwwqQCLOOXPl58ljnq3sTJR7yRuMolM02vjxDh4ZVE=
-github.com/djimenez/iconv-go v0.0.0-20160305225143-8960e66bd3da/go.mod h1:ns+zIWBBchgfRdxNgIJWn2x6U95LQchxeqiN5Cgdgts=
 github.com/edsrzf/mmap-go v0.0.0-20190108065903-904c4ced31cd h1:v8VTjPes659sdlQ3O2AbICsk2XjORhYc76QLCFSTEgA=
 github.com/edsrzf/mmap-go v0.0.0-20190108065903-904c4ced31cd/go.mod h1:W3m91qexYIu40kcj8TLXNUSTCKprH8UQ3GgH5/Xyfc0=
 github.com/glycerine/go-unsnap-stream v0.0.0-20181221182339-f9677308dec2 h1:Ujru1hufTHVb++eG6OuNDKMxZnGIvF6o/u8q/8h2+I4=
@@ -47,13 +45,8 @@ github.com/tinylib/msgp v1.1.0 h1:9fQd+ICuRIu/ue4vxJZu6/LzxN0HwMds2nq/0cFvxHU=
 github.com/tinylib/msgp v1.1.0/go.mod h1:+d+yLhGm8mzTaHzB+wgMYrodPfmZrzkirds8fDWklFE=
 github.com/willf/bitset v1.1.10 h1:NotGKqX0KwQ72NUzqrjZq5ipPNDQex9lo3WpaS8L2sc=
 github.com/willf/bitset v1.1.10/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914 h1:MlY3mEfbnWGmUi4rtHOtNnnnN4UJRGSyLPx+DXA5Sq4=
-golang.org/x/net v0.0.0-20191119073136-fc4aabc6c914/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6/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 v0.0.0-20190426135247-a129542de9ae h1:mQLHiymj/JXKnnjc62tb7nD5pZLs940/sXJu+Xp3DBA=
 golang.org/x/sys v0.0.0-20190426135247-a129542de9ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

internal/spellchecker/api/app.go

@@ -3,16 +3,17 @@ package api
 import (
 	"context"
 	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
 	"github.com/suggest-go/suggest/internal/http"
 	"github.com/suggest-go/suggest/internal/spellchecker/dep"
 	"github.com/suggest-go/suggest/pkg/lm"
 	"github.com/suggest-go/suggest/pkg/suggest"
-	"log"
-	"os"
-	"os/signal"
-	"syscall"
 )
 
 // App is our application
@@ -22,9 +23,9 @@ type App struct {
 
 // AppConfig is an application config
 type AppConfig struct {
-	Port       string
-	ConfigPath string
-	PidPath    string
+	Port             string
+	ConfigPath       string
+	PidPath          string
 	IndexDescription suggest.IndexDescription
 }
 
@@ -41,7 +42,7 @@ func (a App) Run() error {
 	config, err := lm.ReadConfig(a.config.ConfigPath)
 
 	if err != nil {
-		return fmt.Errorf("failed to read config file: %v", err)
+		return fmt.Errorf("failed to read config file: %w", err)
 	}
 
 	spellchecker, err := dep.BuildSpellChecker(config, a.config.IndexDescription)

internal/spellchecker/dep/spellchecker.go

@@ -14,32 +14,32 @@ func BuildSpellChecker(config *lm.Config, indexDescription suggest.IndexDescript
 	directory, err := store.NewFSDirectory(config.GetOutputPath())
 
 	if err != nil {
-		return nil, fmt.Errorf("failed to create a fs directory: %v", err)
+		return nil, fmt.Errorf("failed to create a fs directory: %w", err)
 	}
 
 	languageModel, err := lm.RetrieveLMFromBinary(directory, config)
 
 	if err != nil {
-		return nil, fmt.Errorf("failed to retrieve a lm model from binary format: %v", err)
+		return nil, fmt.Errorf("failed to retrieve a lm model from binary format: %w", err)
 	}
 
 	dict, err := dictionary.OpenCDBDictionary(config.GetDictionaryPath())
 
 	if err != nil {
-		return nil, fmt.Errorf("failed to open a cdb dictionary: %v", err)
+		return nil, fmt.Errorf("failed to open a cdb dictionary: %w", err)
 	}
 
 	// create runtime search index builder
 	builder, err := suggest.NewRAMBuilder(dict, indexDescription)
 
 	if err != nil {
-		return nil, fmt.Errorf("failed to create a ngram index: %v", err)
+		return nil, fmt.Errorf("failed to create a ngram index: %w", err)
 	}
 
 	index, err := builder.Build()
 
 	if err != nil {
-		return nil, fmt.Errorf("failed to build a ngram index: %v", err)
+		return nil, fmt.Errorf("failed to build a ngram index: %w", err)
 	}
 
 	return spellchecker.New(

internal/suggest/api/app.go

@@ -49,7 +49,7 @@ func (a App) Run() error {
 	}
 
 	if err := reindexJob(); err != nil {
-		return fmt.Errorf("Fail to configure service: %s", err)
+		return fmt.Errorf("Fail to configure service: %w", err)
 	}
 
 	ctx, cancelFn := context.WithCancel(context.Background())
@@ -93,13 +93,13 @@ func (a App) writePIDFile() error {
 
 	err := os.MkdirAll(filepath.Dir(a.config.PidPath), 0700)
 	if err != nil {
-		return fmt.Errorf("There is no such file for %s, %s", a.config.PidPath, err)
+		return fmt.Errorf("There is no such file for %s, %w", a.config.PidPath, err)
 	}
 
 	// Retrieve the PID and write it.
 	pid := strconv.Itoa(os.Getpid())
 	if err := ioutil.WriteFile(a.config.PidPath, []byte(pid), 0644); err != nil {
-		return fmt.Errorf("Fail to write pid file to %s, %s", a.config.PidPath, err)
+		return fmt.Errorf("Fail to write pid file to %s, %w", a.config.PidPath, err)
 	}
 
 	return nil

pkg/dictionary/cdb_dictionary.go

@@ -19,7 +19,7 @@ func NewCDBDictionary(r io.ReaderAt) (Dictionary, error) {
 	reader, err := handle.GetReader(r)
 
 	if err != nil {
-		return nil, fmt.Errorf("fail to create cdb dictionary: %v", err)
+		return nil, fmt.Errorf("fail to create cdb dictionary: %w", err)
 	}
 
 	return &cdbDictionary{