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init.go
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init.go
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/*
Copyright (c) 2016, Percona LLC and/or its affiliates. All rights reserved.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package app
import (
"fmt"
"math/rand"
"net/http"
"os"
"runtime"
"strings"
"time"
"github.com/cactus/go-statsd-client/statsd"
"github.com/percona/pmm/proto"
"github.com/percona/qan-api/app/agent"
"github.com/percona/qan-api/app/auth"
"github.com/percona/qan-api/app/controllers"
agentCtrl "github.com/percona/qan-api/app/controllers/agent"
"github.com/percona/qan-api/app/db"
"github.com/percona/qan-api/app/instance"
"github.com/percona/qan-api/app/query"
"github.com/percona/qan-api/app/shared"
"github.com/percona/qan-api/config"
queryService "github.com/percona/qan-api/service/query"
"github.com/percona/qan-api/stats"
"github.com/revel/revel"
)
// AppVersion is set from linker flags set by revel/cmd:
// https://github.com/revel/cmd/blob/97ec1422620f1a83cd13738708a109fe092364ca/harness/build.go#L132
// The value for this variable is taken from os environment variable `APP_VERSION`:
// https://github.com/revel/cmd/blob/97ec1422620f1a83cd13738708a109fe092364ca/harness/build.go#L212
// The value of `APP_VERSION` environment variable is set during package build:
// https://github.com/percona/pmm-server-packaging/blob/611b8a2e372c9a399cedf2371157e78c3efa7bc8/rhel/SPECS/percona-qan-api.spec#L50
// The variable is used to create `X-Percona-QAN-API-Version` header, and it's important for pmm-client:
// https://github.com/percona/pmm-client/blob/9420a44412f82d2e05f1e263492ca9a23345a55f/pmm/check_network.go#L43
// Do not set this var.
var AppVersion = ""
func init() {
runtime.GOMAXPROCS(runtime.NumCPU())
// CLOUD_API_HOSTNAME is only used for testing and should override api.hostname.
hostname := os.Getenv("CLOUD_API_HOSTNAME")
if hostname == "" {
hostname = config.Get("api.hostname")
if hostname == "" {
panic("Set CLOUD_API_HOSTNAME env var or api.hostname in the config file")
}
}
// Use real stats clients only in stage and prod.
statsEnv := config.Get("stats.env")
if statsEnv == "stage" || statsEnv == "prod" {
for _, service := range []string{"", "route"} {
statsClient, err := statsd.NewBufferedClient(
config.Get("statsd.server"),
"", // prefix -- DO NOT SET HERE
250*time.Millisecond, // buffer time
8932, // MTU for gigabit ethernet
)
if err != nil {
panic(fmt.Sprintf("ERROR: statsd.NewBufferedClient: %s", err))
}
s := stats.NewStats(
statsClient,
statsEnv,
config.Get("api.alias"),
service,
config.Get("stats.rate"),
)
switch service {
case "": // internal: agent, api
shared.InternalStats = s
case "route":
shared.RouteStats = s
}
}
}
shared.AgentDirectory = agent.NewLocalDirectory()
go func() {
t := time.NewTicker(1 * time.Minute)
for _ = range t.C {
shared.AgentDirectory.Refresh(20 * time.Second)
}
}()
// Run the query abstracter, used to consume QAN data.
shared.QueryAbstracter = queryService.NewMini(config.ApiRootDir + "/service/query") // tables + abstract using Perl
go shared.QueryAbstracter.Run()
shared.TableParser = queryService.NewMini("") // only tables
go shared.TableParser.Run()
revel.Filters = []revel.Filter{
revel.PanicFilter, // Recover from panics and display an error page instead.
revel.RouterFilter, // Use the routing table to select the right Action
revel.FilterConfiguringFilter, // A hook for adding or removing per-Action filters.
revel.ParamsFilter, // Parse parameters into Controller.Params.
revel.ValidationFilter, // Restore kept validation errors and save new ones from cookie.
revel.InterceptorFilter, // Run interceptors around the action.
revel.ActionInvoker, // Invoke the action.
}
// Tasks to be run at the begin and end of every request
revel.InterceptFunc(beforeController, revel.BEFORE, revel.AllControllers)
revel.InterceptFunc(afterController, revel.FINALLY, revel.AllControllers)
// All access to agent resources (/agents/:uuid/*) must specify a valid agent.
revel.InterceptFunc(authAgent, revel.BEFORE, &agentCtrl.Agent{})
revel.InterceptFunc(getInstanceId, revel.BEFORE, &controllers.QAN{})
revel.InterceptFunc(getQueryId, revel.BEFORE, &controllers.Query{})
}
// Copied from github.com/cactus/go-statsd-client/statsd/main.go
func includeStat(rate float32) bool {
if rate < 1 {
if rand.Float32() < rate {
return true
}
return false
}
return true
}
func beforeController(c *revel.Controller) revel.Result {
if c.Action == "Home.Options" {
return nil
}
if includeStat(shared.RouteStats.SampleRate) {
c.Args["t"] = time.Now()
}
if c.Action == "Home.Ping" {
c.Response.Out.Header().Set("X-Percona-QAN-API-Version", AppVersion)
}
// Create a MySQL db manager for the controller because most need it, but
// don't open the connection yet, let the controller do that when it's
// ready because it might return early (e.g. on invalid input).
// The controller doesn't need to close it; we do that in afterController.
c.Args["dbm"] = db.NewMySQLManager()
// Args for various controllers/routes.
apiBasePath := os.Getenv("BASE_PATH")
if apiBasePath == "" {
apiBasePath = config.Get("api.base.path")
}
schema := "http"
if strings.Contains(strings.ToLower(c.Request.Request.Proto), "https") {
schema = "https"
}
c.Args["wsBase"] = "ws://" + c.Request.Request.Host + apiBasePath
c.Args["httpBase"] = schema + "://" + c.Request.Request.Host + apiBasePath
agentVersion := c.Request.Header.Get("X-Percona-QAN-Agent-Version")
if agentVersion == "" {
agentVersion = "0.0.9"
}
c.Args["agentVersion"] = agentVersion
// Set common headers before Revel sets the response code and writes
// the response body. This avoids "multiple calls to WriterHeader" errors.
c.Response.Out.Header().Set("Access-Control-Allow-Headers", "Content-Type,Authorization")
c.Response.Out.Header().Set("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE")
c.Response.Out.Header().Set("Access-Control-Allow-Origin", "*")
return nil
}
func afterController(c *revel.Controller) revel.Result {
if c.Action == "Home.Options" {
return nil
}
dbm := c.Args["dbm"].(db.Manager)
if err := dbm.Close(); err != nil {
revel.ERROR.Println(err)
}
if c.Args["t"] != nil {
t := c.Args["t"].(time.Time)
d := time.Now().Sub(t)
shared.RouteStats.TimingDuration( // response time
shared.RouteStats.Metric(c.Action+".t"),
d,
1, // sampling handled in beforeController()
)
shared.RouteStats.Inc( // call rate
shared.RouteStats.Metric(c.Action+".call"),
1,
1, // sampling handled in beforeController()
)
}
return nil
}
func authAgent(c *revel.Controller) revel.Result {
// We don't need a valid agent UUID for these routes.
if c.Action == "Agent.Create" || c.Action == "Agent.List" || c.Action == "Home.Options" {
return nil
}
var agentUuid string
c.Params.Bind(&agentUuid, "uuid")
dbm := c.Args["dbm"].(db.Manager)
dbh := auth.NewMySQLHandler(dbm)
authHandler := auth.NewAuthDb(dbh)
agentId, res, err := authHandler.Agent(agentUuid)
if err != nil {
switch err {
case shared.ErrNotFound:
revel.INFO.Printf("auth agent: not found: %s", agentUuid)
default:
revel.ERROR.Printf("auth agent: %s", err)
}
c.Response.Status = int(res.Code)
return c.RenderText(res.Error)
}
c.Args["agentId"] = agentId
return nil // success
}
func getInstanceId(c *revel.Controller) revel.Result {
// Get the internal (auto-inc) instance ID of the UUID.
var uuid string
c.Params.Bind(&uuid, "uuid")
dbm := c.Args["dbm"].(db.Manager)
if err := dbm.Open(); err != nil {
return internalError(c, "init.getInstanceId: dbm.Open", err)
}
instanceId, err := instance.GetInstanceId(dbm.DB(), uuid)
if err != nil {
switch err {
case shared.ErrNotFound:
c.Response.Status = http.StatusNotFound
return c.RenderText("")
default:
return internalError(c, "init.getInstanceId: ih.GetInstanceId", err)
}
}
c.Args["instanceId"] = instanceId
return nil // success
}
func getQueryId(c *revel.Controller) revel.Result {
// Get the internal (auto-inc) query ID.
var queryId string
c.Params.Bind(&queryId, "id")
dbm := c.Args["dbm"].(db.Manager)
if err := dbm.Open(); err != nil {
return internalError(c, "init.getQueryId: dbm.Open", err)
}
// 92F3B1B361FB0E5B -> 5
classId, err := query.GetClassId(dbm.DB(), queryId)
if err != nil {
switch err {
case shared.ErrNotFound:
c.Response.Status = http.StatusNotFound
return c.RenderText("")
default:
return internalError(c, "init.getQueryId: query.GetClassId", err)
}
}
c.Args["classId"] = classId
return nil // success
}
func internalError(c *revel.Controller, op string, err error) revel.Result {
errMsg := fmt.Sprintf("%s: %s", op, err)
revel.ERROR.Printf(errMsg)
res := proto.Error{
Error: errMsg,
}
c.Response.Status = http.StatusInternalServerError
return c.RenderJSON(res)
}