fix #123: incorrect incompatiblity flags

Added a new Version type to wean off of the vendored semver library.
Simplified base dependency checking for mod.json

Author: sean-callahan

src/factorio_server.go

@@ -16,9 +16,9 @@ import (
 	"strings"
 	"time"
 
-	"github.com/majormjr/rcon"
 	"regexp"
-	"github.com/Masterminds/semver"
+
+	"github.com/majormjr/rcon"
 )
 
 type FactorioServer struct {
@@ -28,9 +28,8 @@ type FactorioServer struct {
 	BindIP         string                 `json:"bindip"`
 	Port           int                    `json:"port"`
 	Running        bool                   `json:"running"`
-	Version        string                 `json:"fac_version"`
+	Version        Version                `json:"fac_version"`
 	BaseModVersion string                 `json:"base_mod_version"`
-	SemVerVersion  *semver.Version        `json:"-"`
 	StdOut         io.ReadCloser          `json:"-"`
 	StdErr         io.ReadCloser          `json:"-"`
 	StdIn          io.WriteCloser         `json:"-"`
@@ -97,7 +96,6 @@ func initFactorio() (f *FactorioServer, err error) {
 
 	log.Printf("Loaded Factorio settings from %s\n", settingsPath)
 
-
 	//Load factorio version
 	out, err := exec.Command(config.FactorioBinary, "--version").Output()
 	if err != nil {
@@ -107,7 +105,11 @@ func initFactorio() (f *FactorioServer, err error) {
 
 	reg := regexp.MustCompile("Version.*?((\\d+\\.)?(\\d+\\.)?(\\*|\\d+)+)")
 	found := reg.FindStringSubmatch(string(out))
-	f.Version = found[1]
+	err = f.Version.UnmarshalText([]byte(found[1]))
+	if err != nil {
+		log.Printf("could not parse version: %v", err)
+		return
+	}
 
 	//Load baseMod version
 	baseModInfoFile := filepath.Join(config.FactorioDir, "data", "base", "info.json")
@@ -124,10 +126,6 @@ func initFactorio() (f *FactorioServer, err error) {
 	}
 
 	f.BaseModVersion = modInfo.Version
-	f.SemVerVersion, err = semver.NewVersion(modInfo.Version)
-	if err != nil {
-		log.Fatalf("error loading semver-factorio-version: %s", err)
-	}
 
 	return
 }

src/handlers.go

@@ -3,7 +3,6 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/gorilla/mux"
 	"io"
 	"io/ioutil"
 	"log"
@@ -12,6 +11,8 @@ import (
 	"path/filepath"
 	"strconv"
 	"time"
+
+	"github.com/gorilla/mux"
 )
 
 type JSONResponse struct {
@@ -443,7 +444,7 @@ func FactorioVersion(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json;charset=UTF-8")
 
 	status := map[string]string{}
-	status["version"] = FactorioServ.Version
+	status["version"] = FactorioServ.Version.String()
 	status["base_mod_version"] = FactorioServ.BaseModVersion
 
 	resp.Data = status

src/mod_modInfo.go

@@ -18,14 +18,14 @@ type ModInfoList struct {
 	Destination string    `json:"-"`
 }
 type ModInfo struct {
-	Name            string      `json:"name"`
-	Version         string      `json:"version"`
-	Title           string      `json:"title"`
-	Author          string      `json:"author"`
-	FileName        string      `json:"file_name"`
-	FactorioVersion string      `json:"factorio_version"`
-	Dependencies    []string    `json:"dependencies"`
-	Compatibility   bool        `json:"compatibility"`
+	Name            string   `json:"name"`
+	Version         string   `json:"version"`
+	Title           string   `json:"title"`
+	Author          string   `json:"author"`
+	FileName        string   `json:"file_name"`
+	FactorioVersion Version  `json:"factorio_version"`
+	Dependencies    []string `json:"dependencies"`
+	Compatibility   bool     `json:"compatibility"`
 }
 
 func newModInfoList(destination string) (ModInfoList, error) {
@@ -74,33 +74,37 @@ func (modInfoList *ModInfoList) listInstalledMods() error {
 
 			modInfo.FileName = info.Name()
 
-			var baseDependency string
-			for _, dependency := range modInfo.Dependencies {
-				if strings.HasPrefix(dependency, "base") {
-					splittedDep := strings.Split(dependency, "=")
+			var base Version
+			for _, dep := range modInfo.Dependencies {
+				dep = strings.TrimSpace(dep)
+				if dep == "" {
+					continue
+				}
 
-					if len(splittedDep) == 1 {
-						log.Printf("basemod without version specified!")
-						break
-					}
+				parts := strings.Split(dep, " ")
+				if len(parts) != 3 {
+					log.Printf("skipping dependency '%s' in '%s': invalid format\n", dep, modInfo.Name)
+				}
+				if parts[0] != "base" {
+					continue
+				}
 
-					baseDependency = strings.Split(dependency, "=")[1]
-					break
+				if parts[1] != ">=" {
+					log.Printf("skipping dependency '%s' in '%s': unsupported comparison\n", dep, modInfo.Name)
 				}
-			}
-			if baseDependency != "" {
-				modInfo.Compatibility, err = checkModCompatibility(baseDependency)
-				if err != nil {
-					log.Printf("error checking mod compatibility: %s", err)
-					return err
+
+				if err := base.UnmarshalText([]byte(parts[2])); err != nil {
+					log.Printf("skipping dependency '%s' in '%s': %v\n", dep, modInfo.Name, err)
 				}
+
+				break
+			}
+
+			if !base.Equals(NilVersion) {
+				modInfo.Compatibility = !FactorioServ.Version.Less(base)
 			} else {
 				log.Println("error finding basemodDependency. Using FactorioVersion...")
-				modInfo.Compatibility, err = checkModCompatibility(modInfo.FactorioVersion + ".0")
-				if err != nil {
-					log.Printf("error checking Compatibility with FactorioVersion: %s", err)
-					return err
-				}
+				modInfo.Compatibility = !FactorioServ.Version.Less(modInfo.FactorioVersion)
 			}
 
 			modInfoList.Mods = append(modInfoList.Mods, modInfo)

src/mods.go

@@ -12,7 +12,6 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-	"github.com/Masterminds/semver"
 )
 
 type LoginErrorResponse struct {
@@ -345,19 +344,3 @@ func modStartUp() {
 		}
 	}
 }
-
-func checkModCompatibility(modVersion string) (compatible bool, err error) {
-	compatible = false
-	modVersion = strings.TrimSpace(modVersion)
-	if !strings.HasPrefix(modVersion, "~") {
-		modVersion = "~" + modVersion
-	}
-
-	constraint, err := semver.NewConstraint(modVersion)
-	if err != nil {
-		log.Printf("error loading constraint: %s", err)
-		return
-	}
-
-	return constraint.Check(FactorioServ.SemVerVersion), nil
-}

src/version.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+var NilVersion = Version{0, 0, 0}
+
+// Version represents a semantic version
+type Version [3]uint
+
+func (v Version) String() string {
+	return fmt.Sprintf("%d.%d.%d", v[0], v[1], v[2])
+}
+
+// MarshalText implements encoding.TextMarshaller for Version
+func (v Version) MarshalText() (text []byte, err error) {
+	return []byte(v.String()), nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaller for Version
+func (v *Version) UnmarshalText(text []byte) error {
+	parts := strings.SplitN(string(text), ".", 3)
+	for i, part := range parts {
+		p, err := strconv.ParseUint(part, 10, 32)
+		if err != nil {
+			return err
+		}
+		v[i] = uint(p)
+	}
+	return nil
+}
+
+// Equals returns true if both version are equal
+func (v Version) Equals(b Version) bool {
+	return v[0] == b[0] && v[1] == b[1] && v[2] == b[2]
+}
+
+// Less returns true if the receiver version is less than the argument version
+func (v Version) Less(b Version) bool {
+	switch {
+	case v[0] < b[0]:
+		return true
+	case v[0] == b[0] && v[1] < b[1]:
+		return true
+	case v[0] == b[0] && v[1] == b[1] && v[2] < b[2]:
+		return true
+	default:
+		return false
+	}
+}