(SDI-2475) Configure the TempDir where the API loads plugins.

control/config.go

@@ -23,6 +23,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"os"
 	"reflect"
 	"strconv"
 	"time"
@@ -36,16 +37,17 @@ import (
 )
 
 // default configuration values
-const (
-	defaultListenAddr        string        = "127.0.0.1"
-	defaultListenPort        int           = 8082
-	defaultMaxRunningPlugins int           = 3
-	defaultPluginLoadTimeout int           = 3
-	defaultPluginTrust       int           = 1
-	defaultAutoDiscoverPath  string        = ""
-	defaultKeyringPaths      string        = ""
-	defaultCacheExpiration   time.Duration = 500 * time.Millisecond
-	defaultPprof             bool          = false
+var (
+	defaultListenAddr        = "127.0.0.1"
+	defaultListenPort        = 8082
+	defaultMaxRunningPlugins = 3
+	defaultPluginLoadTimeout = 3
+	defaultPluginTrust       = 1
+	defaultAutoDiscoverPath  = ""
+	defaultKeyringPaths      = ""
+	defaultCacheExpiration   = 500 * time.Millisecond
+	defaultPprof             = false
+	defaultTempDirPath       = os.TempDir()
 )
 
 type pluginConfig struct {
@@ -83,6 +85,7 @@ type Config struct {
 	ListenPort        int                          `json:"listen_port,omitempty"yaml:"listen_port"`
 	Pprof             bool                         `json:"pprof"yaml:"pprof"`
 	MaxPluginRestarts int                          `json:"max_plugin_restarts"yaml:"max_plugin_restarts"`
+	TempDirPath       string                       `json:"temp_dir_path"yaml:"temp_dir_path"`
 }
 
 const (
@@ -132,6 +135,9 @@ const (
 					"pprof": {
 						"type": "boolean"
 					},
+					"temp_dir_path": {
+						"type": "string"
+					},
 					"max_plugin_restarts": {
 						"type": "integer"
 					}
@@ -156,6 +162,7 @@ func GetDefaultConfig() *Config {
 		Tags:              newPluginTags(),
 		Pprof:             defaultPprof,
 		MaxPluginRestarts: MaxPluginRestartCount,
+		TempDirPath:       defaultTempDirPath,
 	}
 }
 

control/config_test.go

@@ -309,9 +309,6 @@ func TestControlDefaultConfig(t *testing.T) {
 		Convey("ListenPort should be set to 8082", func() {
 			So(cfg.ListenPort, ShouldEqual, 8082)
 		})
-		Convey("KeyringPaths should be empty", func() {
-			So(cfg.KeyringPaths, ShouldEqual, "")
-		})
 		Convey("PluginTrust should equal 1", func() {
 			So(cfg.PluginTrust, ShouldEqual, 1)
 		})

control/flags.go

@@ -70,5 +70,11 @@ var (
 		EnvVar: "SNAP_CONTROL_LISTEN_ADDR",
 	}
 
-	Flags = []cli.Flag{flNumberOfPLs, flPluginLoadTimeout, flAutoDiscover, flPluginTrust, flKeyringPaths, flCache, flControlRpcPort, flControlRpcAddr}
+	flTempDirPath = cli.StringFlag{
+		Name:   "temp_dir_path",
+		Usage:  fmt.Sprintf("Temporary path for loading plugins (default: %v)", defaultTempDirPath),
+		EnvVar: "SNAP_TEMP_DIR_PATH",
+	}
+
+	Flags = []cli.Flag{flNumberOfPLs, flPluginLoadTimeout, flAutoDiscover, flPluginTrust, flKeyringPaths, flCache, flControlRpcPort, flControlRpcAddr, flTempDirPath}
 )

docs/SNAPTELD.md

@@ -43,6 +43,7 @@ $ snapteld [global options] command [command options] [arguments...]
 --cache-expiration value                     The time limit for which a metric cache entry is valid (default: 500ms) [$SNAP_CACHE_EXPIRATION]
 --control-listen-port value                  Listen port for control RPC server (default: 8082) [$SNAP_CONTROL_LISTEN_PORT]
 --control-listen-addr value                  Listen address for control RPC server [$SNAP_CONTROL_LISTEN_ADDR]
+--temp_dir_path value                        Temporary path for loading plugins [$SNAP_TEMP_DIR_PATH]
 --work-manager-queue-size value              Size of the work manager queue (default: 25) [$WORK_MANAGER_QUEUE_SIZE]
 --work-manager-pool-size value               Size of the work manager pool (default: 4) [$WORK_MANAGER_POOL_SIZE]
 --disable-api, -d                            Disable the agent REST API

docs/SNAPTELD_CONFIGURATION.md

@@ -101,6 +101,9 @@ control:
   # not be loaded. Valid values are 0 - Off, 1 - Enabled, 2 - Warning
   plugin_trust_level: 1
 
+  # temp_dir_path sets the temporary directory which houses the temporary files 
+  temp_dir_path: /tmp
+
   # max_plugin_restarts controls how many times a plugin is allowed to be restarted
   # before failing. Snap will not disable a plugin due to failures when this value is -1.
   max_plugin_restarts: 10

examples/configs/snap-config-sample.json

@@ -13,6 +13,7 @@
         "max_running_plugins":1,
         "plugin_load_timeout":10,
         "keyring_paths":"/etc/snap/keyrings",
+        "temp_dir_path":"/tmp",
         "plugin_trust_level":0,
         "plugins":{
             "all":{

examples/configs/snap-config-sample.yaml

@@ -65,6 +65,9 @@ control:
   # not be loaded. Valid values are 0 - Off, 1 - Enabled, 2 - Warning
   plugin_trust_level: 0
 
+  # temp_dir_path sets the temporary directory which houses the temporary files 
+  temp_dir_path: /tmp
+
   # max_plugin_restarts controls how many times a plugin is allowed to be restarted
   # before failing. Snap will not disable a plugin due to failures when this value is -1.
   max_plugin_restarts: 10

mgmt/rest/common/common.go

@@ -0,0 +1,39 @@
+package common
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"runtime"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/intelsdi-x/snap/control"
+)
+
+func WriteFile(filename string, b []byte) (string, error) {
+	// Create temporary directory
+	dir, err := ioutil.TempDir(control.GetDefaultConfig().TempDirPath, "snap-plugin-")
+	if err != nil {
+		return "", err
+	}
+
+	f, err := os.Create(path.Join(dir, filename))
+	if err != nil {
+		return "", err
+	}
+	// Close before load
+	defer f.Close()
+
+	n, err := f.Write(b)
+	log.Debugf("wrote %v to %v", n, f.Name())
+	if err != nil {
+		return "", err
+	}
+	if runtime.GOOS != "windows" {
+		err = f.Chmod(0700)
+		if err != nil {
+			return "", err
+		}
+	}
+	return f.Name(), nil
+}

mgmt/rest/v1/plugin.go

@@ -30,16 +30,14 @@ import (
 	"mime/multipart"
 	"net/http"
 	"os"
-	"path"
 	"path/filepath"
-	"runtime"
 	"strconv"
 	"strings"
 
-	log "github.com/Sirupsen/logrus"
 	"github.com/intelsdi-x/snap/core"
 	"github.com/intelsdi-x/snap/core/serror"
 	"github.com/intelsdi-x/snap/mgmt/rest/api"
+	"github.com/intelsdi-x/snap/mgmt/rest/common"
 	"github.com/intelsdi-x/snap/mgmt/rest/v1/rbody"
 	"github.com/julienschmidt/httprouter"
 )
@@ -128,7 +126,7 @@ func (s *apiV1) loadPlugin(w http.ResponseWriter, r *http.Request, _ httprouter.
 					rbody.Write(500, rbody.FromError(e), w)
 					return
 				}
-				if pluginPath, err = writeFile(p.FileName(), b); err != nil {
+				if pluginPath, err = common.WriteFile(p.FileName(), b); err != nil {
 					rbody.Write(500, rbody.FromError(err), w)
 					return
 				}
@@ -187,33 +185,6 @@ func (s *apiV1) loadPlugin(w http.ResponseWriter, r *http.Request, _ httprouter.
 	}
 }
 
-func writeFile(filename string, b []byte) (string, error) {
-	// Create temporary directory
-	dir, err := ioutil.TempDir("", "")
-	if err != nil {
-		return "", err
-	}
-	f, err := os.Create(path.Join(dir, filename))
-	if err != nil {
-		return "", err
-	}
-	// Close before load
-	defer f.Close()
-
-	n, err := f.Write(b)
-	log.Debugf("wrote %v to %v", n, f.Name())
-	if err != nil {
-		return "", err
-	}
-	if runtime.GOOS != "windows" {
-		err = f.Chmod(0700)
-		if err != nil {
-			return "", err
-		}
-	}
-	return f.Name(), nil
-}
-
 func (s *apiV1) unloadPlugin(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
 	plName := p.ByName("name")
 	plType := p.ByName("type")

mgmt/rest/v2/plugin.go

@@ -34,13 +34,10 @@ import (
 	"strconv"
 	"strings"
 
-	"path"
-	"runtime"
-
-	log "github.com/Sirupsen/logrus"
 	"github.com/intelsdi-x/snap/control"
 	"github.com/intelsdi-x/snap/core"
 	"github.com/intelsdi-x/snap/core/serror"
+	"github.com/intelsdi-x/snap/mgmt/rest/common"
 	"github.com/julienschmidt/httprouter"
 )
 
@@ -95,6 +92,7 @@ func (s *apiV2) loadPlugin(w http.ResponseWriter, r *http.Request, _ httprouter.
 		Write(415, FromError(err), w)
 		return
 	}
+
 	if strings.HasPrefix(mediaType, "multipart/") {
 		var pluginPath string
 		var signature []byte
@@ -146,7 +144,7 @@ func (s *apiV2) loadPlugin(w http.ResponseWriter, r *http.Request, _ httprouter.
 					Write(400, FromError(e), w)
 					return
 				}
-				if pluginPath, err = writeFile(p.FileName(), b); err != nil {
+				if pluginPath, err = common.WriteFile(p.FileName(), b); err != nil {
 					Write(500, FromError(err), w)
 					return
 				}
@@ -204,33 +202,6 @@ func (s *apiV2) loadPlugin(w http.ResponseWriter, r *http.Request, _ httprouter.
 	}
 }
 
-func writeFile(filename string, b []byte) (string, error) {
-	// Create temporary directory
-	dir, err := ioutil.TempDir("", "")
-	if err != nil {
-		return "", err
-	}
-	f, err := os.Create(path.Join(dir, filename))
-	if err != nil {
-		return "", err
-	}
-	// Close before load
-	defer f.Close()
-
-	n, err := f.Write(b)
-	log.Debugf("wrote %v to %v", n, f.Name())
-	if err != nil {
-		return "", err
-	}
-	if runtime.GOOS != "windows" {
-		err = f.Chmod(0700)
-		if err != nil {
-			return "", err
-		}
-	}
-	return f.Name(), nil
-}
-
 func pluginParameters(p httprouter.Params) (string, string, int, map[string]interface{}, serror.SnapError) {
 	plName := p.ByName("name")
 	plType := p.ByName("type")

snapteld.go

@@ -192,6 +192,7 @@ type managesTribe interface {
 
 func main() {
 	// Add a check to see if gitversion is blank from the build process
+
 	if gitversion == "" {
 		gitversion = "unknown"
 	}
@@ -797,6 +798,7 @@ func applyCmdLineFlags(cfg *Config, ctx *cli.Context) {
 	cfg.Control.ListenAddr = setStringVal(cfg.Control.ListenAddr, ctx, "control-listen-addr")
 	cfg.Control.ListenPort = setIntVal(cfg.Control.ListenPort, ctx, "control-listen-port")
 	cfg.Control.Pprof = setBoolVal(cfg.Control.Pprof, ctx, "pprof")
+	cfg.Control.TempDirPath = setStringVal(cfg.Control.TempDirPath, ctx, "temp_dir_path")
 	// next for the RESTful server related flags
 	cfg.RestAPI.Enable = setBoolVal(cfg.RestAPI.Enable, ctx, "disable-api", invertBoolean)
 	cfg.RestAPI.Port = setIntVal(cfg.RestAPI.Port, ctx, "api-port")