Refactor: zabbix client

pkg/datasource/datasource.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/gtime"
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/httpclient"
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbixapi"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
@@ -30,7 +31,7 @@ type ZabbixDatasource struct {
 // ZabbixDatasourceInstance stores state about a specific datasource
 // and provides methods to make requests to the Zabbix API
 type ZabbixDatasourceInstance struct {
-	zabbixAPI  *zabbixapi.ZabbixAPI
+	zabbix     *zabbix.Zabbix
 	dsInfo     *backend.DataSourceInstanceSettings
 	Settings   *ZabbixDatasourceSettings
 	queryCache *DatasourceCache
@@ -58,6 +59,7 @@ func newZabbixDatasourceInstance(settings backend.DataSourceInstanceSettings) (i
 
 	client, err := httpclient.NewHttpClient(&settings, zabbixSettings.Timeout)
 	if err != nil {
+		logger.Error("Error initializing HTTP client", "error", err)
 		return nil, err
 	}
 
@@ -67,9 +69,15 @@ func newZabbixDatasourceInstance(settings backend.DataSourceInstanceSettings) (i
 		return nil, err
 	}
 
+	zabbixClient, err := zabbix.New(&settings, zabbixAPI)
+	if err != nil {
+		logger.Error("Error initializing Zabbix client", "error", err)
+		return nil, err
+	}
+
 	return &ZabbixDatasourceInstance{
 		dsInfo:     &settings,
-		zabbixAPI:  zabbixAPI,
+		zabbix:     zabbixClient,
 		Settings:   zabbixSettings,
 		queryCache: NewDatasourceCache(zabbixSettings.CacheTTL, 10*time.Minute),
 		logger:     logger,

pkg/datasource/datasource_test.go

@@ -61,7 +61,7 @@ func TestZabbixBackend_getCachedDatasource(t *testing.T) {
 			got, _ := ds.getDSInstance(tt.pluginContext)
 
 			// Only checking the URL, being the easiest value to, and guarantee equality for
-			assert.Equal(t, tt.want.zabbixAPI.GetUrl().String(), got.zabbixAPI.GetUrl().String())
+			assert.Equal(t, tt.want.zabbix.GetAPI().GetUrl().String(), got.zabbix.GetAPI().GetUrl().String())
 		})
 	}
 }

pkg/datasource/resource_handler.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"net/http"
 
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/resource/httpadapter"
 )
 
@@ -47,7 +48,7 @@ func (ds *ZabbixDatasource) ZabbixAPIHandler(rw http.ResponseWriter, req *http.R
 		return
 	}
 
-	apiReq := &ZabbixAPIRequest{Method: reqData.Method, Params: reqData.Params}
+	apiReq := &zabbix.ZabbixAPIRequest{Method: reqData.Method, Params: reqData.Params}
 
 	result, err := dsInstance.ZabbixAPIQuery(req.Context(), apiReq)
 	if err != nil {

pkg/datasource/response_handler.go

@@ -4,11 +4,12 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 )
 
-func convertHistoryToDataFrame(history History, items Items) *data.Frame {
+func convertHistoryToDataFrame(history History, items zabbix.Items) *data.Frame {
 	timeFileld := data.NewFieldFromFieldType(data.FieldTypeTime, 0)
 	timeFileld.Name = "time"
 	frame := data.NewFrame("History", timeFileld)

pkg/datasource/zabbix.go

@@ -3,57 +3,18 @@ package datasource
 import (
 	"encoding/json"
 	"fmt"
-	"regexp"
-	"strings"
 	"time"
 
-	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbixapi"
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	simplejson "github.com/bitly/go-simplejson"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"golang.org/x/net/context"
 )
 
-var CachedMethods = map[string]bool{
-	"hostgroup.get":   true,
-	"host.get":        true,
-	"application.get": true,
-	"item.get":        true,
-	"service.get":     true,
-	"usermacro.get":   true,
-	"proxy.get":       true,
-}
-
-// ZabbixQuery handles query requests to Zabbix
-func (ds *ZabbixDatasourceInstance) ZabbixQuery(ctx context.Context, apiReq *ZabbixAPIRequest) (*simplejson.Json, error) {
-	var resultJson *simplejson.Json
-	var err error
-
-	cachedResult, queryExistInCache := ds.queryCache.GetAPIRequest(apiReq)
-	if !queryExistInCache {
-		resultJson, err = ds.ZabbixRequest(ctx, apiReq.Method, apiReq.Params)
-		if err != nil {
-			return nil, err
-		}
-
-		if _, ok := CachedMethods[apiReq.Method]; ok {
-			ds.logger.Debug("Writing result to cache", "method", apiReq.Method)
-			ds.queryCache.SetAPIRequest(apiReq, resultJson)
-		}
-	} else {
-		var ok bool
-		resultJson, ok = cachedResult.(*simplejson.Json)
-		if !ok {
-			resultJson = simplejson.New()
-		}
-	}
-
-	return resultJson, nil
-}
-
 // ZabbixAPIQuery handles query requests to Zabbix API
-func (ds *ZabbixDatasourceInstance) ZabbixAPIQuery(ctx context.Context, apiReq *ZabbixAPIRequest) (*ZabbixAPIResourceResponse, error) {
-	resultJson, err := ds.ZabbixQuery(ctx, apiReq)
+func (ds *ZabbixDatasourceInstance) ZabbixAPIQuery(ctx context.Context, apiReq *zabbix.ZabbixAPIRequest) (*ZabbixAPIResourceResponse, error) {
+	resultJson, err := ds.zabbix.Request(ctx, apiReq)
 	if err != nil {
 		return nil, err
 	}
@@ -69,12 +30,12 @@ func BuildAPIResponse(responseData *interface{}) (*ZabbixAPIResourceResponse, er
 
 // TestConnection checks authentication and version of the Zabbix API and returns that info
 func (ds *ZabbixDatasourceInstance) TestConnection(ctx context.Context) (string, error) {
-	_, err := ds.getAllGroups(ctx)
+	_, err := ds.zabbix.GetAllGroups(ctx)
 	if err != nil {
 		return "", err
 	}
 
-	response, err := ds.ZabbixRequest(ctx, "apiinfo.version", ZabbixAPIParams{})
+	response, err := ds.zabbix.Request(ctx, &zabbix.ZabbixAPIRequest{Method: "apiinfo.version"})
 	if err != nil {
 		return "", err
 	}
@@ -83,67 +44,13 @@ func (ds *ZabbixDatasourceInstance) TestConnection(ctx context.Context) (string,
 	return string(resultByte), nil
 }
 
-// ZabbixRequest checks authentication and makes a request to the Zabbix API
-func (ds *ZabbixDatasourceInstance) ZabbixRequest(ctx context.Context, method string, params ZabbixAPIParams) (*simplejson.Json, error) {
-	ds.logger.Debug("Zabbix API request", "datasource", ds.dsInfo.Name, "method", method)
-	var result *simplejson.Json
-	var err error
-
-	// Skip auth for methods that are not required it
-	if method == "apiinfo.version" {
-		return ds.zabbixAPI.RequestUnauthenticated(ctx, method, params)
-	}
-
-	result, err = ds.zabbixAPI.Request(ctx, method, params)
-	notAuthorized := isNotAuthorized(err)
-	if err == zabbixapi.ErrNotAuthenticated || notAuthorized {
-		if notAuthorized {
-			ds.logger.Debug("Authentication token expired, performing re-login")
-		}
-		err = ds.login(ctx)
-		if err != nil {
-			return nil, err
-		}
-		return ds.ZabbixRequest(ctx, method, params)
-	} else if err != nil {
-		return nil, err
-	}
-
-	return result, err
-}
-
-func (ds *ZabbixDatasourceInstance) login(ctx context.Context) error {
-	jsonData, err := simplejson.NewJson(ds.dsInfo.JSONData)
-	if err != nil {
-		return err
-	}
-
-	zabbixLogin := jsonData.Get("username").MustString()
-	var zabbixPassword string
-	if securePassword, exists := ds.dsInfo.DecryptedSecureJSONData["password"]; exists {
-		zabbixPassword = securePassword
-	} else {
-		// Fallback
-		zabbixPassword = jsonData.Get("password").MustString()
-	}
-
-	err = ds.zabbixAPI.Authenticate(ctx, zabbixLogin, zabbixPassword)
-	if err != nil {
-		ds.logger.Error("Zabbix authentication error", "error", err)
-		return err
-	}
-	ds.logger.Debug("Successfully authenticated", "url", ds.zabbixAPI.GetUrl().String(), "user", zabbixLogin)
-
-	return nil
-}
-
 func (ds *ZabbixDatasourceInstance) queryNumericItems(ctx context.Context, query *QueryModel) (*data.Frame, error) {
 	groupFilter := query.Group.Filter
 	hostFilter := query.Host.Filter
 	appFilter := query.Application.Filter
 	itemFilter := query.Item.Filter
 
-	items, err := ds.getItems(ctx, groupFilter, hostFilter, appFilter, itemFilter, "num")
+	items, err := ds.zabbix.GetItems(ctx, groupFilter, hostFilter, appFilter, itemFilter, "num")
 	if err != nil {
 		return nil, err
 	}
@@ -156,215 +63,7 @@ func (ds *ZabbixDatasourceInstance) queryNumericItems(ctx context.Context, query
 	return frames, nil
 }
 
-func (ds *ZabbixDatasourceInstance) getItems(ctx context.Context, groupFilter string, hostFilter string, appFilter string, itemFilter string, itemType string) (Items, error) {
-	hosts, err := ds.getHosts(ctx, groupFilter, hostFilter)
-	if err != nil {
-		return nil, err
-	}
-	var hostids []string
-	for _, k := range hosts {
-		hostids = append(hostids, k["hostid"].(string))
-	}
-
-	apps, err := ds.getApps(ctx, groupFilter, hostFilter, appFilter)
-	// Apps not supported in Zabbix 5.4 and higher
-	if isAppMethodNotFoundError(err) {
-		apps = []map[string]interface{}{}
-	} else if err != nil {
-		return nil, err
-	}
-	var appids []string
-	for _, l := range apps {
-		appids = append(appids, l["applicationid"].(string))
-	}
-
-	var allItems *simplejson.Json
-	if len(hostids) > 0 {
-		allItems, err = ds.getAllItems(ctx, hostids, nil, itemType)
-	} else if len(appids) > 0 {
-		allItems, err = ds.getAllItems(ctx, nil, appids, itemType)
-	}
-
-	var items Items
-
-	if allItems == nil {
-		items = Items{}
-	} else {
-		itemsJSON, err := allItems.MarshalJSON()
-		if err != nil {
-			return nil, err
-		}
-
-		err = json.Unmarshal(itemsJSON, &items)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	re, err := parseFilter(itemFilter)
-	if err != nil {
-		return nil, err
-	}
-
-	filteredItems := Items{}
-	for _, item := range items {
-		itemName := item.ExpandItem()
-		if item.Status == "0" {
-			if re != nil {
-				if re.MatchString(itemName) {
-					filteredItems = append(filteredItems, item)
-				}
-			} else if itemName == itemFilter {
-				filteredItems = append(filteredItems, item)
-			}
-		}
-	}
-	return filteredItems, nil
-}
-
-func (ds *ZabbixDatasourceInstance) getApps(ctx context.Context, groupFilter string, hostFilter string, appFilter string) ([]map[string]interface{}, error) {
-	hosts, err := ds.getHosts(ctx, groupFilter, hostFilter)
-	if err != nil {
-		return nil, err
-	}
-	var hostids []string
-	for _, k := range hosts {
-		hostids = append(hostids, k["hostid"].(string))
-	}
-	allApps, err := ds.getAllApps(ctx, hostids)
-	if err != nil {
-		return nil, err
-	}
-
-	re, err := parseFilter(appFilter)
-	if err != nil {
-		return nil, err
-	}
-
-	var apps []map[string]interface{}
-	for _, i := range allApps.MustArray() {
-		name := i.(map[string]interface{})["name"].(string)
-		if re != nil {
-			if re.MatchString(name) {
-				apps = append(apps, i.(map[string]interface{}))
-			}
-		} else if name == appFilter {
-			apps = append(apps, i.(map[string]interface{}))
-		}
-	}
-	return apps, nil
-}
-
-func (ds *ZabbixDatasourceInstance) getHosts(ctx context.Context, groupFilter string, hostFilter string) ([]map[string]interface{}, error) {
-	groups, err := ds.getGroups(ctx, groupFilter)
-	if err != nil {
-		return nil, err
-	}
-	var groupids []string
-	for _, k := range groups {
-		groupids = append(groupids, k["groupid"].(string))
-	}
-	allHosts, err := ds.getAllHosts(ctx, groupids)
-	if err != nil {
-		return nil, err
-	}
-
-	re, err := parseFilter(hostFilter)
-	if err != nil {
-		return nil, err
-	}
-
-	var hosts []map[string]interface{}
-	for _, i := range allHosts.MustArray() {
-		name := i.(map[string]interface{})["name"].(string)
-		if re != nil {
-			if re.MatchString(name) {
-				hosts = append(hosts, i.(map[string]interface{}))
-			}
-		} else if name == hostFilter {
-			hosts = append(hosts, i.(map[string]interface{}))
-		}
-
-	}
-
-	return hosts, nil
-}
-
-func (ds *ZabbixDatasourceInstance) getGroups(ctx context.Context, groupFilter string) ([]map[string]interface{}, error) {
-	allGroups, err := ds.getAllGroups(ctx)
-	if err != nil {
-		return nil, err
-	}
-	re, err := parseFilter(groupFilter)
-	if err != nil {
-		return nil, err
-	}
-
-	var groups []map[string]interface{}
-	for _, i := range allGroups.MustArray() {
-		name := i.(map[string]interface{})["name"].(string)
-		if re != nil {
-			if re.MatchString(name) {
-				groups = append(groups, i.(map[string]interface{}))
-			}
-		} else if name == groupFilter {
-			groups = append(groups, i.(map[string]interface{}))
-		}
-	}
-	return groups, nil
-}
-
-func (ds *ZabbixDatasourceInstance) getAllItems(ctx context.Context, hostids []string, appids []string, itemtype string) (*simplejson.Json, error) {
-	params := ZabbixAPIParams{
-		"output":         []string{"itemid", "name", "key_", "value_type", "hostid", "status", "state"},
-		"sortfield":      "name",
-		"webitems":       true,
-		"filter":         map[string]interface{}{},
-		"selectHosts":    []string{"hostid", "name"},
-		"hostids":        hostids,
-		"applicationids": appids,
-	}
-
-	filter := params["filter"].(map[string]interface{})
-	if itemtype == "num" {
-		filter["value_type"] = []int{0, 3}
-	} else if itemtype == "text" {
-		filter["value_type"] = []int{1, 2, 4}
-	}
-
-	return ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "item.get", Params: params})
-}
-
-func (ds *ZabbixDatasourceInstance) getAllApps(ctx context.Context, hostids []string) (*simplejson.Json, error) {
-	params := ZabbixAPIParams{
-		"output":  "extend",
-		"hostids": hostids,
-	}
-
-	return ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "application.get", Params: params})
-}
-
-func (ds *ZabbixDatasourceInstance) getAllHosts(ctx context.Context, groupids []string) (*simplejson.Json, error) {
-	params := ZabbixAPIParams{
-		"output":    []string{"name", "host"},
-		"sortfield": "name",
-		"groupids":  groupids,
-	}
-
-	return ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "host.get", Params: params})
-}
-
-func (ds *ZabbixDatasourceInstance) getAllGroups(ctx context.Context) (*simplejson.Json, error) {
-	params := ZabbixAPIParams{
-		"output":     []string{"name"},
-		"sortfield":  "name",
-		"real_hosts": true,
-	}
-
-	return ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "hostgroup.get", Params: params})
-}
-
-func (ds *ZabbixDatasourceInstance) queryNumericDataForItems(ctx context.Context, query *QueryModel, items Items) (*data.Frame, error) {
+func (ds *ZabbixDatasourceInstance) queryNumericDataForItems(ctx context.Context, query *QueryModel, items zabbix.Items) (*data.Frame, error) {
 	valueType := ds.getTrendValueType(query)
 	consolidateBy := ds.getConsolidateBy(query)
 
@@ -404,12 +103,12 @@ func (ds *ZabbixDatasourceInstance) getConsolidateBy(query *QueryModel) string {
 	return consolidateBy
 }
 
-func (ds *ZabbixDatasourceInstance) getHistotyOrTrend(ctx context.Context, query *QueryModel, items Items) (History, error) {
+func (ds *ZabbixDatasourceInstance) getHistotyOrTrend(ctx context.Context, query *QueryModel, items zabbix.Items) (History, error) {
 	timeRange := query.TimeRange
 	useTrend := ds.isUseTrend(timeRange)
 	allHistory := History{}
 
-	groupedItems := map[int]Items{}
+	groupedItems := map[int]zabbix.Items{}
 
 	for _, j := range items {
 		groupedItems[j.ValueType] = append(groupedItems[j.ValueType], j)
@@ -433,10 +132,10 @@ func (ds *ZabbixDatasourceInstance) getHistotyOrTrend(ctx context.Context, query
 		var response *simplejson.Json
 		var err error
 		if useTrend {
-			response, err = ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "trend.get", Params: params})
+			response, err = ds.zabbix.Request(ctx, &zabbix.ZabbixAPIRequest{Method: "trend.get", Params: params})
 		} else {
 			params["history"] = &k
-			response, err = ds.ZabbixQuery(ctx, &ZabbixAPIRequest{Method: "history.get", Params: params})
+			response, err = ds.zabbix.Request(ctx, &zabbix.ZabbixAPIRequest{Method: "history.get", Params: params})
 		}
 
 		if err != nil {
@@ -475,45 +174,3 @@ func (ds *ZabbixDatasourceInstance) isUseTrend(timeRange backend.TimeRange) bool
 	}
 	return false
 }
-
-func parseFilter(filter string) (*regexp.Regexp, error) {
-	regex := regexp.MustCompile(`^/(.+)/(.*)$`)
-	flagRE := regexp.MustCompile("[imsU]+")
-
-	matches := regex.FindStringSubmatch(filter)
-	if len(matches) <= 1 {
-		return nil, nil
-	}
-
-	pattern := ""
-	if matches[2] != "" {
-		if flagRE.MatchString(matches[2]) {
-			pattern += "(?" + matches[2] + ")"
-		} else {
-			return nil, fmt.Errorf("error parsing regexp: unsupported flags `%s` (expected [imsU])", matches[2])
-		}
-	}
-	pattern += matches[1]
-
-	return regexp.Compile(pattern)
-}
-
-func isNotAuthorized(err error) bool {
-	if err == nil {
-		return false
-	}
-
-	message := err.Error()
-	return strings.Contains(message, "Session terminated, re-login, please.") ||
-		strings.Contains(message, "Not authorised.") ||
-		strings.Contains(message, "Not authorized.")
-}
-
-func isAppMethodNotFoundError(err error) bool {
-	if err == nil {
-		return false
-	}
-
-	message := err.Error()
-	return message == `Method not found. Incorrect API "application".`
-}

pkg/datasource/zabbix_test.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/cache"
-	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbixapi"
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
 	"github.com/stretchr/testify/assert"
@@ -32,23 +32,23 @@ var basicDatasourceInfo = &backend.DataSourceInstanceSettings{
 	ID:       1,
 	Name:     "TestDatasource",
 	URL:      "http://zabbix.org/zabbix",
-	JSONData: []byte(`{"username":"username", "password":"password"}}`),
+	JSONData: []byte(`{"username":"username", "password":"password", "cacheTTL":"10m"}`),
 }
 
-func mockZabbixQuery(method string, params ZabbixAPIParams) *ZabbixAPIRequest {
-	return &ZabbixAPIRequest{
+func mockZabbixQuery(method string, params ZabbixAPIParams) *zabbix.ZabbixAPIRequest {
+	return &zabbix.ZabbixAPIRequest{
 		Method: method,
 		Params: params,
 	}
 }
 
 func MockZabbixDataSource(body string, statusCode int) *ZabbixDatasourceInstance {
-	zabbixAPI, _ := zabbixapi.MockZabbixAPI(body, statusCode)
 	zabbixSettings, _ := readZabbixSettings(basicDatasourceInfo)
+	zabbixClient, _ := zabbix.MockZabbixClient(basicDatasourceInfo, body, statusCode)
 
 	return &ZabbixDatasourceInstance{
 		dsInfo:     basicDatasourceInfo,
-		zabbixAPI:  zabbixAPI,
+		zabbix:     zabbixClient,
 		Settings:   zabbixSettings,
 		queryCache: NewDatasourceCache(cache.NoExpiration, 10*time.Minute),
 		logger:     log.New(),
@@ -56,26 +56,26 @@ func MockZabbixDataSource(body string, statusCode int) *ZabbixDatasourceInstance
 }
 
 func MockZabbixDataSourceResponse(dsInstance *ZabbixDatasourceInstance, body string, statusCode int) *ZabbixDatasourceInstance {
-	zabbixAPI, _ := zabbixapi.MockZabbixAPI(body, statusCode)
-	dsInstance.zabbixAPI = zabbixAPI
+	zabbixClient, _ := zabbix.MockZabbixAPI(dsInstance.zabbix, body, statusCode)
+	dsInstance.zabbix = zabbixClient
 
 	return dsInstance
 }
 
 func TestLogin(t *testing.T) {
 	dsInstance := MockZabbixDataSource(`{"result":"secretauth"}`, 200)
-	err := dsInstance.login(context.Background())
+	err := dsInstance.zabbix.Login(context.Background())
 
 	assert.Nil(t, err)
-	assert.Equal(t, "secretauth", dsInstance.zabbixAPI.GetAuth())
+	assert.Equal(t, "secretauth", dsInstance.zabbix.GetAPI().GetAuth())
 }
 
 func TestLoginError(t *testing.T) {
 	dsInstance := MockZabbixDataSource(`{"result":""}`, 500)
-	err := dsInstance.login(context.Background())
+	err := dsInstance.zabbix.Login(context.Background())
 
 	assert.NotNil(t, err)
-	assert.Equal(t, "", dsInstance.zabbixAPI.GetAuth())
+	assert.Equal(t, "", dsInstance.zabbix.GetAPI().GetAuth())
 }
 
 func TestZabbixAPIQuery(t *testing.T) {

pkg/zabbix/cache.go

@@ -0,0 +1,55 @@
+package zabbix
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"time"
+
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/cache"
+)
+
+var cachedMethods = map[string]bool{
+	"hostgroup.get":   true,
+	"host.get":        true,
+	"application.get": true,
+	"item.get":        true,
+	"service.get":     true,
+	"usermacro.get":   true,
+	"proxy.get":       true,
+}
+
+func IsCachedRequest(method string) bool {
+	_, ok := cachedMethods[method]
+	return ok
+}
+
+// ZabbixCache is a cache for datasource instance.
+type ZabbixCache struct {
+	cache *cache.Cache
+}
+
+// NewZabbixCache creates a DatasourceCache with expiration(ttl) time and cleanupInterval.
+func NewZabbixCache(ttl time.Duration, cleanupInterval time.Duration) *ZabbixCache {
+	return &ZabbixCache{
+		cache.NewCache(ttl, cleanupInterval),
+	}
+}
+
+// GetAPIRequest gets request response from cache
+func (c *ZabbixCache) GetAPIRequest(request *ZabbixAPIRequest) (interface{}, bool) {
+	requestHash := HashString(request.String())
+	return c.cache.Get(requestHash)
+}
+
+// SetAPIRequest writes request response to cache
+func (c *ZabbixCache) SetAPIRequest(request *ZabbixAPIRequest, response interface{}) {
+	requestHash := HashString(request.String())
+	c.cache.Set(requestHash, response)
+}
+
+// HashString converts the given text string to hash string
+func HashString(text string) string {
+	hash := sha1.New()
+	hash.Write([]byte(text))
+	return hex.EncodeToString(hash.Sum(nil))
+}

pkg/zabbix/methods.go

@@ -0,0 +1,225 @@
+package zabbix
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/bitly/go-simplejson"
+)
+
+func (ds *Zabbix) GetItems(ctx context.Context, groupFilter string, hostFilter string, appFilter string, itemFilter string, itemType string) (Items, error) {
+	hosts, err := ds.GetHosts(ctx, groupFilter, hostFilter)
+	if err != nil {
+		return nil, err
+	}
+	var hostids []string
+	for _, k := range hosts {
+		hostids = append(hostids, k["hostid"].(string))
+	}
+
+	apps, err := ds.GetApps(ctx, groupFilter, hostFilter, appFilter)
+	// Apps not supported in Zabbix 5.4 and higher
+	if isAppMethodNotFoundError(err) {
+		apps = []map[string]interface{}{}
+	} else if err != nil {
+		return nil, err
+	}
+	var appids []string
+	for _, l := range apps {
+		appids = append(appids, l["applicationid"].(string))
+	}
+
+	var allItems *simplejson.Json
+	if len(hostids) > 0 {
+		allItems, err = ds.GetAllItems(ctx, hostids, nil, itemType)
+	} else if len(appids) > 0 {
+		allItems, err = ds.GetAllItems(ctx, nil, appids, itemType)
+	}
+
+	var items Items
+
+	if allItems == nil {
+		items = Items{}
+	} else {
+		itemsJSON, err := allItems.MarshalJSON()
+		if err != nil {
+			return nil, err
+		}
+
+		err = json.Unmarshal(itemsJSON, &items)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	re, err := parseFilter(itemFilter)
+	if err != nil {
+		return nil, err
+	}
+
+	filteredItems := Items{}
+	for _, item := range items {
+		itemName := item.ExpandItem()
+		if item.Status == "0" {
+			if re != nil {
+				if re.MatchString(itemName) {
+					filteredItems = append(filteredItems, item)
+				}
+			} else if itemName == itemFilter {
+				filteredItems = append(filteredItems, item)
+			}
+		}
+	}
+	return filteredItems, nil
+}
+
+func (ds *Zabbix) GetApps(ctx context.Context, groupFilter string, hostFilter string, appFilter string) ([]map[string]interface{}, error) {
+	hosts, err := ds.GetHosts(ctx, groupFilter, hostFilter)
+	if err != nil {
+		return nil, err
+	}
+	var hostids []string
+	for _, k := range hosts {
+		hostids = append(hostids, k["hostid"].(string))
+	}
+	allApps, err := ds.GetAllApps(ctx, hostids)
+	if err != nil {
+		return nil, err
+	}
+
+	re, err := parseFilter(appFilter)
+	if err != nil {
+		return nil, err
+	}
+
+	var apps []map[string]interface{}
+	for _, i := range allApps.MustArray() {
+		name := i.(map[string]interface{})["name"].(string)
+		if re != nil {
+			if re.MatchString(name) {
+				apps = append(apps, i.(map[string]interface{}))
+			}
+		} else if name == appFilter {
+			apps = append(apps, i.(map[string]interface{}))
+		}
+	}
+	return apps, nil
+}
+
+func (ds *Zabbix) GetHosts(ctx context.Context, groupFilter string, hostFilter string) ([]map[string]interface{}, error) {
+	groups, err := ds.GetGroups(ctx, groupFilter)
+	if err != nil {
+		return nil, err
+	}
+	var groupids []string
+	for _, k := range groups {
+		groupids = append(groupids, k["groupid"].(string))
+	}
+	allHosts, err := ds.GetAllHosts(ctx, groupids)
+	if err != nil {
+		return nil, err
+	}
+
+	re, err := parseFilter(hostFilter)
+	if err != nil {
+		return nil, err
+	}
+
+	var hosts []map[string]interface{}
+	for _, i := range allHosts.MustArray() {
+		name := i.(map[string]interface{})["name"].(string)
+		if re != nil {
+			if re.MatchString(name) {
+				hosts = append(hosts, i.(map[string]interface{}))
+			}
+		} else if name == hostFilter {
+			hosts = append(hosts, i.(map[string]interface{}))
+		}
+
+	}
+
+	return hosts, nil
+}
+
+func (ds *Zabbix) GetGroups(ctx context.Context, groupFilter string) ([]map[string]interface{}, error) {
+	allGroups, err := ds.GetAllGroups(ctx)
+	if err != nil {
+		return nil, err
+	}
+	re, err := parseFilter(groupFilter)
+	if err != nil {
+		return nil, err
+	}
+
+	var groups []map[string]interface{}
+	for _, i := range allGroups.MustArray() {
+		name := i.(map[string]interface{})["name"].(string)
+		if re != nil {
+			if re.MatchString(name) {
+				groups = append(groups, i.(map[string]interface{}))
+			}
+		} else if name == groupFilter {
+			groups = append(groups, i.(map[string]interface{}))
+		}
+	}
+	return groups, nil
+}
+
+func (ds *Zabbix) GetAllItems(ctx context.Context, hostids []string, appids []string, itemtype string) (*simplejson.Json, error) {
+	params := ZabbixAPIParams{
+		"output":         []string{"itemid", "name", "key_", "value_type", "hostid", "status", "state"},
+		"sortfield":      "name",
+		"webitems":       true,
+		"filter":         map[string]interface{}{},
+		"selectHosts":    []string{"hostid", "name"},
+		"hostids":        hostids,
+		"applicationids": appids,
+	}
+
+	filter := params["filter"].(map[string]interface{})
+	if itemtype == "num" {
+		filter["value_type"] = []int{0, 3}
+	} else if itemtype == "text" {
+		filter["value_type"] = []int{1, 2, 4}
+	}
+
+	return ds.Request(ctx, &ZabbixAPIRequest{Method: "item.get", Params: params})
+}
+
+func (ds *Zabbix) GetAllApps(ctx context.Context, hostids []string) (*simplejson.Json, error) {
+	params := ZabbixAPIParams{
+		"output":  "extend",
+		"hostids": hostids,
+	}
+
+	return ds.Request(ctx, &ZabbixAPIRequest{Method: "application.get", Params: params})
+}
+
+func (ds *Zabbix) GetAllHosts(ctx context.Context, groupids []string) (*simplejson.Json, error) {
+	params := ZabbixAPIParams{
+		"output":    []string{"name", "host"},
+		"sortfield": "name",
+		"groupids":  groupids,
+	}
+
+	return ds.Request(ctx, &ZabbixAPIRequest{Method: "host.get", Params: params})
+}
+
+func (ds *Zabbix) GetAllGroups(ctx context.Context) (*simplejson.Json, error) {
+	params := ZabbixAPIParams{
+		"output":     []string{"name"},
+		"sortfield":  "name",
+		"real_hosts": true,
+	}
+
+	return ds.Request(ctx, &ZabbixAPIRequest{Method: "hostgroup.get", Params: params})
+}
+
+func isAppMethodNotFoundError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	message := err.Error()
+	return message == `Method not found. Incorrect API "application".`
+}

pkg/zabbix/models.go

@@ -0,0 +1,76 @@
+package zabbix
+
+import (
+	"encoding/json"
+	"time"
+)
+
+type ZabbixDatasourceSettingsDTO struct {
+	Trends      bool   `json:"trends"`
+	TrendsFrom  string `json:"trendsFrom"`
+	TrendsRange string `json:"trendsRange"`
+	CacheTTL    string `json:"cacheTTL"`
+	Timeout     string `json:"timeout"`
+
+	DisableReadOnlyUsersAck bool `json:"disableReadOnlyUsersAck"`
+}
+
+type ZabbixDatasourceSettings struct {
+	Trends      bool
+	TrendsFrom  time.Duration
+	TrendsRange time.Duration
+	CacheTTL    time.Duration
+	Timeout     time.Duration
+
+	DisableReadOnlyUsersAck bool `json:"disableReadOnlyUsersAck"`
+}
+
+type ZabbixAPIParams = map[string]interface{}
+
+type ZabbixAPIRequest struct {
+	Method string          `json:"method"`
+	Params ZabbixAPIParams `json:"params,omitempty"`
+}
+
+func (r *ZabbixAPIRequest) String() string {
+	jsonRequest, _ := json.Marshal(r.Params)
+	return r.Method + string(jsonRequest)
+}
+
+type Items []Item
+
+type Item struct {
+	ID        string     `json:"itemid,omitempty"`
+	Key       string     `json:"key_,omitempty"`
+	Name      string     `json:"name,omitempty"`
+	ValueType int        `json:"value_type,omitempty,string"`
+	HostID    string     `json:"hostid,omitempty"`
+	Hosts     []ItemHost `json:"hosts,omitempty"`
+	Status    string     `json:"status,omitempty"`
+	State     string     `json:"state,omitempty"`
+}
+
+type ItemHost struct {
+	ID   string `json:"hostid,omitempty"`
+	Name string `json:"name,omitempty"`
+}
+
+type Trend []TrendPoint
+
+type TrendPoint struct {
+	ItemID   string `json:"itemid,omitempty"`
+	Clock    int64  `json:"clock,omitempty,string"`
+	Num      string `json:"num,omitempty"`
+	ValueMin string `json:"value_min,omitempty"`
+	ValueAvg string `json:"value_avg,omitempty"`
+	ValueMax string `json:"value_max,omitempty"`
+}
+
+type History []HistoryPoint
+
+type HistoryPoint struct {
+	ItemID string  `json:"itemid,omitempty"`
+	Clock  int64   `json:"clock,omitempty,string"`
+	Value  float64 `json:"value,omitempty,string"`
+	NS     int64   `json:"ns,omitempty,string"`
+}

pkg/zabbix/settings.go

@@ -0,0 +1,64 @@
+package zabbix
+
+import (
+	"encoding/json"
+	"errors"
+	"strconv"
+	"time"
+
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/gtime"
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+)
+
+func readZabbixSettings(dsInstanceSettings *backend.DataSourceInstanceSettings) (*ZabbixDatasourceSettings, error) {
+	zabbixSettingsDTO := &ZabbixDatasourceSettingsDTO{}
+
+	err := json.Unmarshal(dsInstanceSettings.JSONData, &zabbixSettingsDTO)
+	if err != nil {
+		return nil, err
+	}
+
+	if zabbixSettingsDTO.TrendsFrom == "" {
+		zabbixSettingsDTO.TrendsFrom = "7d"
+	}
+	if zabbixSettingsDTO.TrendsRange == "" {
+		zabbixSettingsDTO.TrendsRange = "4d"
+	}
+	if zabbixSettingsDTO.CacheTTL == "" {
+		zabbixSettingsDTO.CacheTTL = "1h"
+	}
+
+	if zabbixSettingsDTO.Timeout == "" {
+		zabbixSettingsDTO.Timeout = "30"
+	}
+
+	trendsFrom, err := gtime.ParseInterval(zabbixSettingsDTO.TrendsFrom)
+	if err != nil {
+		return nil, err
+	}
+
+	trendsRange, err := gtime.ParseInterval(zabbixSettingsDTO.TrendsRange)
+	if err != nil {
+		return nil, err
+	}
+
+	cacheTTL, err := gtime.ParseInterval(zabbixSettingsDTO.CacheTTL)
+	if err != nil {
+		return nil, err
+	}
+
+	timeout, err := strconv.Atoi(zabbixSettingsDTO.Timeout)
+	if err != nil {
+		return nil, errors.New("failed to parse timeout: " + err.Error())
+	}
+
+	zabbixSettings := &ZabbixDatasourceSettings{
+		Trends:      zabbixSettingsDTO.Trends,
+		TrendsFrom:  trendsFrom,
+		TrendsRange: trendsRange,
+		CacheTTL:    cacheTTL,
+		Timeout:     time.Duration(timeout) * time.Second,
+	}
+
+	return zabbixSettings, nil
+}

pkg/zabbix/testing.go

@@ -0,0 +1,31 @@
+package zabbix
+
+import (
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbixapi"
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+)
+
+func MockZabbixClient(dsInfo *backend.DataSourceInstanceSettings, body string, statusCode int) (*Zabbix, error) {
+	zabbixAPI, err := zabbixapi.MockZabbixAPI(body, statusCode)
+	if err != nil {
+		return nil, err
+	}
+
+	client, err := New(dsInfo, zabbixAPI)
+	if err != nil {
+		return nil, err
+	}
+
+	return client, nil
+}
+
+func MockZabbixAPI(client *Zabbix, body string, statusCode int) (*Zabbix, error) {
+	zabbixAPI, err := zabbixapi.MockZabbixAPI(body, statusCode)
+	if err != nil {
+		return nil, err
+	}
+
+	client.api = zabbixAPI
+
+	return client, nil
+}

pkg/zabbix/utils.go

@@ -0,0 +1,80 @@
+package zabbix
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+func (item *Item) ExpandItem() string {
+	name := item.Name
+	key := item.Key
+
+	if strings.Index(key, "[") == -1 {
+		return name
+	}
+
+	keyRunes := []rune(item.Key)
+	keyParamsStr := string(keyRunes[strings.Index(key, "[")+1 : strings.LastIndex(key, "]")])
+	keyParams := splitKeyParams(keyParamsStr)
+
+	for i := len(keyParams); i >= 1; i-- {
+		name = strings.ReplaceAll(name, fmt.Sprintf("$%v", i), keyParams[i-1])
+	}
+
+	return name
+}
+
+func splitKeyParams(paramStr string) []string {
+	paramRunes := []rune(paramStr)
+	params := []string{}
+	quoted := false
+	inArray := false
+	splitSymbol := ","
+	param := ""
+
+	for _, r := range paramRunes {
+		symbol := string(r)
+		if symbol == `"` && inArray {
+			param += symbol
+		} else if symbol == `"` && quoted {
+			quoted = false
+		} else if symbol == `"` && !quoted {
+			quoted = true
+		} else if symbol == "[" && !quoted {
+			inArray = true
+		} else if symbol == "]" && !quoted {
+			inArray = false
+		} else if symbol == splitSymbol && !quoted && !inArray {
+			params = append(params, param)
+			param = ""
+		} else {
+			param += symbol
+		}
+	}
+
+	params = append(params, param)
+	return params
+}
+
+func parseFilter(filter string) (*regexp.Regexp, error) {
+	regex := regexp.MustCompile(`^/(.+)/(.*)$`)
+	flagRE := regexp.MustCompile("[imsU]+")
+
+	matches := regex.FindStringSubmatch(filter)
+	if len(matches) <= 1 {
+		return nil, nil
+	}
+
+	pattern := ""
+	if matches[2] != "" {
+		if flagRE.MatchString(matches[2]) {
+			pattern += "(?" + matches[2] + ")"
+		} else {
+			return nil, fmt.Errorf("error parsing regexp: unsupported flags `%s` (expected [imsU])", matches[2])
+		}
+	}
+	pattern += matches[1]
+
+	return regexp.Compile(pattern)
+}

pkg/zabbix/zabbix.go

@@ -0,0 +1,135 @@
+package zabbix
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbixapi"
+	"github.com/bitly/go-simplejson"
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/backend/log"
+)
+
+// Zabbix is a wrapper for Zabbix API. It wraps Zabbix API queries and performs authentication, adds caching,
+// deduplication and other performance optimizations.
+type Zabbix struct {
+	api    *zabbixapi.ZabbixAPI
+	dsInfo *backend.DataSourceInstanceSettings
+	cache  *ZabbixCache
+	logger log.Logger
+}
+
+// New returns new instance of Zabbix client.
+func New(dsInfo *backend.DataSourceInstanceSettings, zabbixAPI *zabbixapi.ZabbixAPI) (*Zabbix, error) {
+	logger := log.New()
+
+	zabbixSettings, err := readZabbixSettings(dsInfo)
+	if err != nil {
+		logger.Error("Error parsing Zabbix settings", "error", err)
+		return nil, err
+	}
+
+	zabbixCache := NewZabbixCache(zabbixSettings.CacheTTL, 10*time.Minute)
+
+	return &Zabbix{
+		api:    zabbixAPI,
+		dsInfo: dsInfo,
+		cache:  zabbixCache,
+		logger: logger,
+	}, nil
+}
+
+func (zabbix *Zabbix) GetAPI() *zabbixapi.ZabbixAPI {
+	return zabbix.api
+}
+
+// Request wraps request with cache
+func (ds *Zabbix) Request(ctx context.Context, apiReq *ZabbixAPIRequest) (*simplejson.Json, error) {
+	var resultJson *simplejson.Json
+	var err error
+
+	cachedResult, queryExistInCache := ds.cache.GetAPIRequest(apiReq)
+	if !queryExistInCache {
+		resultJson, err = ds.request(ctx, apiReq.Method, apiReq.Params)
+		if err != nil {
+			return nil, err
+		}
+
+		if IsCachedRequest(apiReq.Method) {
+			ds.logger.Debug("Writing result to cache", "method", apiReq.Method)
+			ds.cache.SetAPIRequest(apiReq, resultJson)
+		}
+	} else {
+		var ok bool
+		resultJson, ok = cachedResult.(*simplejson.Json)
+		if !ok {
+			resultJson = simplejson.New()
+		}
+	}
+
+	return resultJson, nil
+}
+
+// request checks authentication and makes a request to the Zabbix API.
+func (zabbix *Zabbix) request(ctx context.Context, method string, params ZabbixAPIParams) (*simplejson.Json, error) {
+	zabbix.logger.Debug("Zabbix request", "method", method)
+
+	// Skip auth for methods that are not required it
+	if method == "apiinfo.version" {
+		return zabbix.api.RequestUnauthenticated(ctx, method, params)
+	}
+
+	result, err := zabbix.api.Request(ctx, method, params)
+	notAuthorized := isNotAuthorized(err)
+	if err == zabbixapi.ErrNotAuthenticated || notAuthorized {
+		if notAuthorized {
+			zabbix.logger.Debug("Authentication token expired, performing re-login")
+		}
+		err = zabbix.Login(ctx)
+		if err != nil {
+			return nil, err
+		}
+		return zabbix.request(ctx, method, params)
+	} else if err != nil {
+		return nil, err
+	}
+
+	return result, err
+}
+
+func (zabbix *Zabbix) Login(ctx context.Context) error {
+	jsonData, err := simplejson.NewJson(zabbix.dsInfo.JSONData)
+	if err != nil {
+		return err
+	}
+
+	zabbixLogin := jsonData.Get("username").MustString()
+	var zabbixPassword string
+	if securePassword, exists := zabbix.dsInfo.DecryptedSecureJSONData["password"]; exists {
+		zabbixPassword = securePassword
+	} else {
+		// Fallback
+		zabbixPassword = jsonData.Get("password").MustString()
+	}
+
+	err = zabbix.api.Authenticate(ctx, zabbixLogin, zabbixPassword)
+	if err != nil {
+		zabbix.logger.Error("Zabbix authentication error", "error", err)
+		return err
+	}
+	zabbix.logger.Debug("Successfully authenticated", "url", zabbix.api.GetUrl().String(), "user", zabbixLogin)
+
+	return nil
+}
+
+func isNotAuthorized(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	message := err.Error()
+	return strings.Contains(message, "Session terminated, re-login, please.") ||
+		strings.Contains(message, "Not authorised.") ||
+		strings.Contains(message, "Not authorized.")
+}

pkg/zabbixapi/zabbix_api.go

@@ -19,6 +19,7 @@ var (
 	ErrNotAuthenticated = errors.New("zabbix api: not authenticated")
 )
 
+// ZabbixAPI is a simple client responsible for making request to Zabbix API
 type ZabbixAPI struct {
 	url        *url.URL
 	httpClient *http.Client