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federation_resolvers.go
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federation_resolvers.go
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// Package federation_resolvers contains handler logic for the /federation_resolvers and
// /federation_resolvers/{{ID}} endpoints.
package federation_resolvers
/*
* 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"
"fmt"
"net/http"
"time"
"github.com/apache/trafficcontrol/lib/go-log"
"github.com/apache/trafficcontrol/lib/go-rfc"
"github.com/apache/trafficcontrol/lib/go-tc"
"github.com/apache/trafficcontrol/lib/go-util"
"github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/api"
"github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/dbhelpers"
"github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/util/ims"
"github.com/jmoiron/sqlx"
)
const insertFederationResolverQuery = `
INSERT INTO federation_resolver (ip_address, type)
VALUES ($1, $2)
RETURNING federation_resolver.id,
federation_resolver.ip_address,
(
SELECT type.name
FROM type
WHERE type.id = federation_resolver.type
) AS type,
federation_resolver.type as typeId
`
const readQuery = `
SELECT federation_resolver.id,
federation_resolver.ip_address,
federation_resolver.last_updated,
type.name AS type
FROM federation_resolver
LEFT OUTER JOIN type ON type.id = federation_resolver.type
`
const deleteQuery = `
DELETE FROM federation_resolver
WHERE federation_resolver.id = $1
RETURNING federation_resolver.id,
federation_resolver.ip_address,
(
SELECT type.name
FROM type
WHERE type.id = federation_resolver.type
) AS type
`
// Create is the handler for POST requests to /federation_resolvers.
func Create(w http.ResponseWriter, r *http.Request) {
inf, sysErr, userErr, errCode := api.NewInfo(r, nil, nil)
tx := inf.Tx.Tx
if sysErr != nil || userErr != nil {
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
defer inf.Close()
var fr tc.FederationResolver
if userErr = api.Parse(r.Body, tx, &fr); userErr != nil {
api.HandleErr(w, r, tx, http.StatusBadRequest, userErr, nil)
return
}
err := tx.QueryRow(insertFederationResolverQuery, fr.IPAddress, fr.TypeID).Scan(&fr.ID, &fr.IPAddress, &fr.Type, &fr.TypeID)
if err != nil {
userErr, sysErr, errCode = api.ParseDBError(err)
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
changeLogMsg := fmt.Sprintf("FEDERATION_RESOLVER: %s, ID: %d, ACTION: Created", *fr.IPAddress, *fr.ID)
api.CreateChangeLogRawTx(api.ApiChange, changeLogMsg, inf.User, tx)
alertMsg := fmt.Sprintf("Federation Resolver created [ IP = %s ] with id: %d", *fr.IPAddress, *fr.ID)
api.WriteRespAlertObj(w, r, tc.SuccessLevel, alertMsg, fr)
}
// Read is the handler for GET requests to /federation_resolvers (and /federation_resolvers/{{ID}}).
func Read(w http.ResponseWriter, r *http.Request) {
var maxTime time.Time
var runSecond bool
inf, sysErr, userErr, errCode := api.NewInfo(r, nil, nil)
tx := inf.Tx.Tx
if sysErr != nil || userErr != nil {
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
defer inf.Close()
queryParamsToQueryCols := map[string]dbhelpers.WhereColumnInfo{
"id": dbhelpers.WhereColumnInfo{Column: "federation_resolver.id", Checker: api.IsInt},
"ipAddress": dbhelpers.WhereColumnInfo{Column: "federation_resolver.ip_address"},
"type": dbhelpers.WhereColumnInfo{Column: "type.name"},
}
where, orderBy, pagination, queryValues, errs := dbhelpers.BuildWhereAndOrderByAndPagination(inf.Params, queryParamsToQueryCols)
if len(errs) > 0 {
sysErr = util.JoinErrs(errs)
errCode = http.StatusBadRequest
api.HandleErr(w, r, tx, errCode, nil, sysErr)
return
}
query := readQuery + where + orderBy + pagination
useIMS := false
config, e := api.GetConfig(r.Context())
if e == nil && config != nil {
useIMS = config.UseIMS
} else {
log.Warnf("Couldn't get config %v", e)
}
if useIMS {
runSecond, maxTime = TryIfModifiedSinceQuery(r.Header, inf.Tx, where, orderBy, pagination, queryValues)
if !runSecond {
log.Debugln("IMS HIT")
api.AddLastModifiedHdr(w, maxTime)
w.WriteHeader(http.StatusNotModified)
api.WriteResp(w, r, []tc.FederationResolver{})
return
}
log.Debugln("IMS MISS")
} else {
log.Debugln("Non IMS request")
}
rows, err := inf.Tx.NamedQuery(query, queryValues)
if err != nil {
userErr, sysErr, errCode = api.ParseDBError(err)
if sysErr != nil {
sysErr = fmt.Errorf("federation_resolver read query: %v", sysErr)
}
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
defer rows.Close()
var resolvers = []tc.FederationResolver{}
for rows.Next() {
var resolver tc.FederationResolver
if err := rows.Scan(&resolver.ID, &resolver.IPAddress, &resolver.LastUpdated, &resolver.Type); err != nil {
userErr, sysErr, errCode = api.ParseDBError(err)
if sysErr != nil {
sysErr = fmt.Errorf("federation_resolver scanning: %v", sysErr)
}
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
resolvers = append(resolvers, resolver)
}
if api.SetLastModifiedHeader(r, useIMS) {
// RFC1123
date := maxTime.Format("Mon, 02 Jan 2006 15:04:05 MST")
w.Header().Add(rfc.LastModified, date)
}
api.WriteResp(w, r, resolvers)
}
func TryIfModifiedSinceQuery(header http.Header, tx *sqlx.Tx, where string, orderBy string, pagination string, queryValues map[string]interface{}) (bool, time.Time) {
var max time.Time
var imsDate time.Time
var ok bool
imsDateHeader := []string{}
runSecond := true
dontRunSecond := false
if header == nil {
return runSecond, max
}
imsDateHeader = header[rfc.IfModifiedSince]
if len(imsDateHeader) == 0 {
return runSecond, max
}
if imsDate, ok = rfc.ParseHTTPDate(imsDateHeader[0]); !ok {
log.Warnf("IMS request header date '%s' not parsable", imsDateHeader[0])
return runSecond, max
}
query := SelectMaxLastUpdatedQuery(where, "federation_resolver")
rows, err := tx.NamedQuery(query, queryValues)
if err != nil {
log.Warnf("Couldn't get the max last updated time: %v", err)
return runSecond, max
}
if err == sql.ErrNoRows {
return dontRunSecond, max
}
defer rows.Close()
// This should only ever contain one row
if rows.Next() {
v := &ims.LatestTimestamp{}
if err = rows.StructScan(v); err != nil || v == nil {
log.Warnf("Failed to parse the max time stamp into a struct %v", err)
return runSecond, max
}
if v.LatestTime != nil {
max = v.LatestTime.Time
// The request IMS time is later than the max of (lastUpdated, deleted_time)
if imsDate.After(v.LatestTime.Time) {
return dontRunSecond, max
}
}
}
return runSecond, max
}
func SelectMaxLastUpdatedQuery(where string, tableName string) string {
return `SELECT max(t) from (
SELECT max(last_updated) as t from ` + tableName + where +
` UNION ALL
select max(last_updated) as t from last_deleted l where l.table_name='` + tableName + `') as res`
}
// Delete is the handler for DELETE requests to /federation_resolvers.
func Delete(w http.ResponseWriter, r *http.Request) {
inf, sysErr, userErr, errCode := api.NewInfo(r, []string{"id"}, []string{"id"})
tx := inf.Tx.Tx
if sysErr != nil || userErr != nil {
api.HandleErr(w, r, tx, errCode, userErr, sysErr)
return
}
defer inf.Close()
fedID := inf.IntParams["id"]
cdnIDs, ok, err := dbhelpers.GetCDNIDsFromFedResolverID(fedID, inf.Tx.Tx)
if err != nil {
api.HandleErr(w, r, inf.Tx.Tx, http.StatusInternalServerError, nil, fmt.Errorf("database exception: %v", err))
return
}
if ok {
userErr, sysErr, errCode = dbhelpers.CheckIfCurrentUserCanModifyCDNsByID(inf.Tx.Tx, cdnIDs, inf.User.UserName)
if userErr != nil || sysErr != nil {
api.HandleErr(w, r, inf.Tx.Tx, errCode, userErr, sysErr)
return
}
}
alert, respObj, userErr, sysErr, statusCode := deleteFederationResolver(inf)
if userErr != nil || sysErr != nil {
api.HandleErr(w, r, tx, statusCode, userErr, sysErr)
return
}
api.WriteRespAlertObj(w, r, tc.SuccessLevel, alert.Text, respObj)
}
func deleteFederationResolver(inf *api.APIInfo) (tc.Alert, tc.FederationResolver, error, error, int) {
var userErr error
var sysErr error
var statusCode = http.StatusOK
var alert tc.Alert
var result tc.FederationResolver
err := inf.Tx.Tx.QueryRow(deleteQuery, inf.IntParams["id"]).Scan(&result.ID, &result.IPAddress, &result.Type)
if err != nil {
if err == sql.ErrNoRows {
userErr = fmt.Errorf("No federation resolver by ID %d", inf.IntParams["id"])
statusCode = http.StatusNotFound
} else {
userErr, sysErr, statusCode = api.ParseDBError(err)
}
return alert, result, userErr, sysErr, statusCode
}
changeLogMsg := fmt.Sprintf("FEDERATION_RESOLVER: %s, ID: %d, ACTION: Deleted", *result.IPAddress, *result.ID)
api.CreateChangeLogRawTx(api.ApiChange, changeLogMsg, inf.User, inf.Tx.Tx)
alertMsg := fmt.Sprintf("Federation resolver deleted [ IP = %s ] with id: %d", *result.IPAddress, *result.ID)
alert = tc.Alert{
Level: tc.SuccessLevel.String(),
Text: alertMsg,
}
return alert, result, userErr, sysErr, statusCode
}