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Backend: implement alerting query(Part 1) #819

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Backend: implement alerting query(Part 1) #819

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60916d7
Added queryNumericItems method
Oct 11, 2019
ef4851f
Added queryNumericDataforItems method
Oct 16, 2019
4c53eb0
Converted the history into proper grafana response
Oct 23, 2019
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190 changes: 190 additions & 0 deletions pkg/zabbix_api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import (
"net"
"net/http"
"net/url"
"regexp"
"time"

simplejson "github.com/bitly/go-simplejson"
Expand Down Expand Up @@ -250,3 +251,192 @@ func makeHttpRequest(ctx context.Context, req *http.Request) ([]byte, error) {
}
return body, nil
}

func (ds *ZabbixDatasource) queryNumericItems(ctx context.Context, tsdbReq *datasource.DatasourceRequest) error {
jsonQueries := make([]*simplejson.Json, 0)
for _, query := range tsdbReq.Queries {
json, err := simplejson.NewJson([]byte(query.ModelJson))
if err != nil {
return err
}

jsonQueries = append(jsonQueries, json)
}

if len(jsonQueries) == 0 {
return errors.New("At least one query should be provided")
}

jsonQuery := jsonQueries[0].Get("target")
groupFilter := jsonQuery.GetPath("group", "filter").MustString()
hostFilter := jsonQuery.GetPath("host", "filter").MustString()
appFilter := jsonQuery.GetPath("application", "filter").MustString()
itemFilter := jsonQuery.GetPath("item", "filter").MustString()

items, err := ds.getItems(ctx, tsdbReq.GetDatasource(), hostFilter, appFilter, itemFilter, groupFilter, "num")

ds.logger.Info("Items", items)

return err
}

func (ds *ZabbixDatasource) getItems(ctx context.Context, dsInfo *datasource.DatasourceInfo, groupFilter string, hostFilter string, appFilter string, itemFilter string, itemType string) ([]*simplejson.Json, error) {
hosts, err := ds.getHosts(ctx, dsInfo, groupFilter, hostFilter)
if err != nil {
return nil, err
}
var hostids []string
for i := range hosts {
hostids = append(hostids, hosts[i].Get("hostid").MustString())
}

apps, err := ds.getApps(ctx, dsInfo, groupFilter, hostFilter, appFilter)
if err != nil {
return nil, err
}
var appids []string
for i := range apps {
appids = append(appids, apps[i].Get("applicationid").MustString())
}

var allItems *simplejson.Json
if len(hostids) > 0 {
allItems, err = ds.getAllItems(ctx, dsInfo, hostids, nil, itemType)
} else if len(appids) > 0 {
allItems, err = ds.getAllItems(ctx, dsInfo, nil, appids, itemType)
}

if err != nil {
return nil, err
}
var items []*simplejson.Json
for k := range allItems.Get("result").MustArray() {
if allItems.Get("result").Get("status").MustString() == "0" {
matched, err := regexp.MatchString(itemFilter, allItems.Get("result").GetIndex(k).MustString())
if err != nil {
return nil, err
} else if matched {
items = append(items, allItems.Get("result").GetIndex(k))
}
}
}
return items, nil
}

func (ds *ZabbixDatasource) getApps(ctx context.Context, dsInfo *datasource.DatasourceInfo, groupFilter string, hostFilter string, appFilter string) ([]*simplejson.Json, error) {
hosts, err := ds.getHosts(ctx, dsInfo, groupFilter, hostFilter)
if err != nil {
return nil, err
}
var hostids []string
for i := range hosts {
hostids = append(hostids, hosts[i].Get("hostid").MustString())
}
allApps, err := ds.getAllApps(ctx, dsInfo, hostids)
if err != nil {
return nil, err
}
var apps []*simplejson.Json
for k := range allApps.Get("result").MustArray() {
matched, err := regexp.MatchString(appFilter, allApps.Get("result").GetIndex(k).MustString())
if err != nil {
return nil, err
} else if matched {
apps = append(apps, allApps.Get("result").GetIndex(k))
}
}
return apps, nil
}

func (ds *ZabbixDatasource) getHosts(ctx context.Context, dsInfo *datasource.DatasourceInfo, groupFilter string, hostFilter string) ([]*simplejson.Json, error) {
groups, err := ds.getGroups(ctx, dsInfo, groupFilter)
if err != nil {
return nil, err
}
var groupids []string
for i := range groups {
groupids = append(groupids, groups[i].Get("groupid").MustString())
}
allHosts, err := ds.getAllHosts(ctx, dsInfo, groupids)
if err != nil {
return nil, err
}
var hosts []*simplejson.Json
for k := range allHosts.Get("result").MustArray() {
matched, err := regexp.MatchString(hostFilter, allHosts.Get("result").GetIndex(k).MustString())
if err != nil {
return nil, err
} else if matched {
hosts = append(hosts, allHosts.Get("result").GetIndex(k))
}
}
return hosts, nil
}

func (ds *ZabbixDatasource) getGroups(ctx context.Context, dsInfo *datasource.DatasourceInfo, groupFilter string) ([]*simplejson.Json, error) {
allGroups, err := ds.getAllGroups(ctx, dsInfo)
if err != nil {
return nil, err
}
var groups []*simplejson.Json
for k := range allGroups.Get("result").MustArray() {
matched, err := regexp.MatchString(groupFilter, allGroups.Get("result").GetIndex(k).MustString())
if err != nil {
return nil, err
} else if matched {
groups = append(groups, allGroups.Get("result").GetIndex(k))
}
}
return groups, nil
}

func (ds *ZabbixDatasource) getAllItems(ctx context.Context, dsInfo *datasource.DatasourceInfo, hostids []string, appids []string, itemtype string) (*simplejson.Json, error) {
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Is "getAllItems" a good name for this? It's not really getting all items, usually it's filtered by hostids.

params, err := simplejson.NewJson([]byte(`{"output":["name", "key_", "value_type", "hostid", "status", "state"], "sortfield": "name", "webitems": true, "filter": {}, "selectHosts": ["hostid", "name"]}`))
if err != nil {
return nil, err
} else if itemtype == "num" {
params.SetPath([]string{"filter", "value_type"}, []int{0, 3})
} else if itemtype == "text" {
params.SetPath([]string{"filter", "value_type"}, []int{1, 2, 4})
}

if len(hostids) > 0 {
params.Set("hostids", hostids)
}

if len(appids) > 0 {
params.Set("applicationids", appids)
}

return ds.ZabbixRequest(ctx, dsInfo, "item.get", params)
}

func (ds *ZabbixDatasource) getAllApps(ctx context.Context, dsInfo *datasource.DatasourceInfo, hostids []string) (*simplejson.Json, error) {
params, err := simplejson.NewJson([]byte(`{"output":"extend"}`))
if err != nil {
return nil, err
} else if len(hostids) > 0 {
params.Set("hostids", hostids)
}

return ds.ZabbixRequest(ctx, dsInfo, "application.get", params)
}

func (ds *ZabbixDatasource) getAllHosts(ctx context.Context, dsInfo *datasource.DatasourceInfo, groupids []string) (*simplejson.Json, error) {
params, err := simplejson.NewJson([]byte(`{"output":["name","host"],"sortfield":"name"}`))
if err != nil {
return nil, err
} else if len(groupids) > 0 {
params.Set("groupids", groupids)
}

return ds.ZabbixRequest(ctx, dsInfo, "host.get", params)
}

func (ds *ZabbixDatasource) getAllGroups(ctx context.Context, dsInfo *datasource.DatasourceInfo) (*simplejson.Json, error) {
params, err := simplejson.NewJson([]byte(`{"output":["name"],"sortfield":"name","real_hosts":true}`))
if err != nil {
return nil, err
}
return ds.ZabbixRequest(ctx, dsInfo, "hostgroup.get", params)
}