rob05c commented on a change in pull request #2305: Add TO Go cdns/health and
cdns/{name}/health
URL: https://github.com/apache/trafficcontrol/pull/2305#discussion_r324730642
##########
File path: traffic_ops/traffic_ops_golang/util/monitorhlp/monitorhlp.go
##########
@@ -0,0 +1,116 @@
+package monitorhlp
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import (
+ "database/sql"
+ "encoding/json"
+ "errors"
+ "net/http"
+ "net/url"
+ "strconv"
+ "time"
+
+ "github.com/apache/trafficcontrol/lib/go-tc"
+
"github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/dbhelpers"
+)
+
+const MonitorProxyParameter = "tm.traffic_mon_fwd_proxy"
+const MonitorRequestTimeout = time.Second * 10
+const MonitorOnlineStatus = "ONLINE"
+
+// GetClient returns the http.Client for making requests to the Traffic
Monitor. This should always be used, rather than creating a default
http.Client, to ensure any monitor forward proxy parameter is used correctly.
+func GetClient(tx *sql.Tx) (*http.Client, error) {
+ monitorForwardProxy, monitorForwardProxyExists, err :=
dbhelpers.GetGlobalParam(tx, MonitorProxyParameter)
+ if err != nil {
+ return nil, errors.New("getting global monitor proxy parameter:
" + err.Error())
+ }
+ client := &http.Client{Timeout: MonitorRequestTimeout}
+ if monitorForwardProxyExists {
+ proxyURI, err := url.Parse(monitorForwardProxy)
+ if err != nil {
+ return nil, errors.New("monitor forward proxy '" +
monitorForwardProxy + "' in parameter '" + MonitorProxyParameter + "' not a
URI: " + err.Error())
+ }
+ client = &http.Client{Timeout: MonitorRequestTimeout,
Transport: &http.Transport{Proxy: http.ProxyURL(proxyURI)}}
+ }
+ return client, nil
+}
+
+// GetURLs returns an FQDN, including port, of an online monitor for each CDN.
If a CDN has no online monitors, that CDN will not have an entry in the map. If
a CDN has multiple online monitors, an arbitrary one will be returned.
+func GetURLs(tx *sql.Tx) (map[tc.CDNName]string, error) {
+ rows, err := tx.Query(`
+SELECT s.host_name, s.domain_name, s.tcp_port, c.name as cdn
+FROM server as s
+JOIN type as t ON s.type = t.id
+JOIN status as st ON st.id = s.status
+JOIN cdn as c ON c.id = s.cdn_id
+WHERE t.name = '` + tc.MonitorTypeName + `'
+AND st.name = '` + MonitorOnlineStatus + `'
+`)
+ if err != nil {
+ return nil, errors.New("querying monitors: " + err.Error())
+ }
+ defer rows.Close()
+ monitors := map[tc.CDNName]string{}
+ for rows.Next() {
+ host := ""
+ domain := ""
+ port := sql.NullInt64{}
+ cdn := ""
+ if err := rows.Scan(&host, &domain, &port, &cdn); err != nil {
+ return nil, errors.New("scanning monitors: " +
err.Error())
+ }
+ fqdn := host + "." + domain
+ if port.Valid {
+ fqdn += ":" + strconv.FormatInt(port.Int64, 10)
+ }
+ monitors[tc.CDNName(cdn)] = fqdn
+ }
+ return monitors, nil
+}
+
+func GetCRStates(monitorFQDN string, client *http.Client) (tc.CRStates, error)
{
Review comment:
Yes, they were copy-pasted, because the PRs were open at the same time, with
the intention of combing them after this was merged to master. Good catch. I'll
do that now.
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