0.3.0 Removing internal parallelism: httpjson and exec
This commit is contained in:
Cameron Sparr
parent
f60d846eb3
commit
41374aabcb
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@ -3,13 +3,8 @@ package exec
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"math"
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"os/exec"
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"strings"
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"sync"
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"time"
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"github.com/gonuts/go-shellquote"
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@ -18,47 +13,28 @@ import (
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)
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const sampleConfig = `
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# specify commands via an array of tables
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[[plugins.exec.commands]]
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# the command to run
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command = "/usr/bin/mycollector --foo=bar"
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# name of the command (used as a prefix for measurements)
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name = "mycollector"
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# Only run this command if it has been at least this many
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# seconds since it last ran
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interval = 10
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`
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type Exec struct {
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Commands []*Command
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runner Runner
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clock Clock
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}
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Command string
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Name string
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type Command struct {
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Command string
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Name string
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Interval int
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lastRunAt time.Time
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runner Runner
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}
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type Runner interface {
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Run(*Command) ([]byte, error)
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}
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type Clock interface {
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Now() time.Time
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Run(*Exec) ([]byte, error)
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}
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type CommandRunner struct{}
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type RealClock struct{}
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func (c CommandRunner) Run(command *Command) ([]byte, error) {
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command.lastRunAt = time.Now()
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split_cmd, err := shellquote.Split(command.Command)
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func (c CommandRunner) Run(e *Exec) ([]byte, error) {
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split_cmd, err := shellquote.Split(e.Command)
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if err != nil || len(split_cmd) == 0 {
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return nil, fmt.Errorf("exec: unable to parse command, %s", err)
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}
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@ -68,18 +44,14 @@ func (c CommandRunner) Run(command *Command) ([]byte, error) {
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cmd.Stdout = &out
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if err := cmd.Run(); err != nil {
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return nil, fmt.Errorf("exec: %s for command '%s'", err, command.Command)
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return nil, fmt.Errorf("exec: %s for command '%s'", err, e.Command)
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}
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return out.Bytes(), nil
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}
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func (c RealClock) Now() time.Time {
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return time.Now()
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}
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func NewExec() *Exec {
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return &Exec{runner: CommandRunner{}, clock: RealClock{}}
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return &Exec{runner: CommandRunner{}}
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}
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func (e *Exec) SampleConfig() string {
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@ -91,72 +63,31 @@ func (e *Exec) Description() string {
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}
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func (e *Exec) Gather(acc plugins.Accumulator) error {
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var wg sync.WaitGroup
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errorChannel := make(chan error, len(e.Commands))
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for _, c := range e.Commands {
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wg.Add(1)
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go func(c *Command, acc plugins.Accumulator) {
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defer wg.Done()
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err := e.gatherCommand(c, acc)
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if err != nil {
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errorChannel <- err
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}
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}(c, acc)
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out, err := e.runner.Run(e)
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if err != nil {
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return err
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}
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wg.Wait()
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close(errorChannel)
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// Get all errors and return them as one giant error
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errorStrings := []string{}
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for err := range errorChannel {
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errorStrings = append(errorStrings, err.Error())
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var jsonOut interface{}
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err = json.Unmarshal(out, &jsonOut)
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if err != nil {
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return fmt.Errorf("exec: unable to parse output of '%s' as JSON, %s",
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e.Command, err)
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}
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if len(errorStrings) == 0 {
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return nil
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f := internal.JSONFlattener{}
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err = f.FlattenJSON("", jsonOut)
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if err != nil {
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return err
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}
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return errors.New(strings.Join(errorStrings, "\n"))
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}
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func (e *Exec) gatherCommand(c *Command, acc plugins.Accumulator) error {
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secondsSinceLastRun := 0.0
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if c.lastRunAt.Unix() == 0 { // means time is uninitialized
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secondsSinceLastRun = math.Inf(1)
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var msrmnt_name string
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if e.Name == "" {
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msrmnt_name = "exec"
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} else {
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secondsSinceLastRun = (e.clock.Now().Sub(c.lastRunAt)).Seconds()
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}
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if secondsSinceLastRun >= float64(c.Interval) {
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out, err := e.runner.Run(c)
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if err != nil {
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return err
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}
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var jsonOut interface{}
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err = json.Unmarshal(out, &jsonOut)
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if err != nil {
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return fmt.Errorf("exec: unable to parse output of '%s' as JSON, %s",
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c.Command, err)
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}
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f := internal.JSONFlattener{}
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err = f.FlattenJSON("", jsonOut)
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if err != nil {
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return err
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}
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var msrmnt_name string
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if c.Name == "" {
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msrmnt_name = "exec"
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} else {
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msrmnt_name = "exec_" + c.Name
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}
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acc.AddFields(msrmnt_name, f.Fields, nil)
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msrmnt_name = "exec_" + e.Name
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}
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acc.AddFields(msrmnt_name, f.Fields, nil)
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return nil
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}
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@ -15,16 +15,12 @@ import (
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)
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type HttpJson struct {
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Services []Service
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client HTTPClient
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}
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type Service struct {
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Name string
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Servers []string
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Method string
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TagKeys []string
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Parameters map[string]string
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client HTTPClient
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}
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type HTTPClient interface {
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@ -48,31 +44,28 @@ func (c RealHTTPClient) MakeRequest(req *http.Request) (*http.Response, error) {
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}
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var sampleConfig = `
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# Specify services via an array of tables
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[[plugins.httpjson.services]]
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# a name for the service being polled
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name = "webserver_stats"
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# a name for the service being polled
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name = "webserver_stats"
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# URL of each server in the service's cluster
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servers = [
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"http://localhost:9999/stats/",
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"http://localhost:9998/stats/",
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]
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# URL of each server in the service's cluster
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servers = [
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"http://localhost:9999/stats/",
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"http://localhost:9998/stats/",
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]
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# HTTP method to use (case-sensitive)
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method = "GET"
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# HTTP method to use (case-sensitive)
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method = "GET"
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# List of tag names to extract from top-level of JSON server response
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# tag_keys = [
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# "my_tag_1",
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# "my_tag_2"
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# ]
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# List of tag names to extract from top-level of JSON server response
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# tag_keys = [
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# "my_tag_1",
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# "my_tag_2"
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# ]
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# HTTP parameters (all values must be strings)
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[plugins.httpjson.services.parameters]
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event_type = "cpu_spike"
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threshold = "0.75"
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# HTTP parameters (all values must be strings)
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[plugins.httpjson.parameters]
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event_type = "cpu_spike"
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threshold = "0.75"
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`
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func (h *HttpJson) SampleConfig() string {
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@ -87,22 +80,16 @@ func (h *HttpJson) Description() string {
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func (h *HttpJson) Gather(acc plugins.Accumulator) error {
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var wg sync.WaitGroup
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totalServers := 0
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for _, service := range h.Services {
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totalServers += len(service.Servers)
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}
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errorChannel := make(chan error, totalServers)
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errorChannel := make(chan error, len(h.Servers))
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for _, service := range h.Services {
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for _, server := range service.Servers {
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wg.Add(1)
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go func(service Service, server string) {
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defer wg.Done()
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if err := h.gatherServer(acc, service, server); err != nil {
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errorChannel <- err
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}
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}(service, server)
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}
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for _, server := range h.Servers {
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wg.Add(1)
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go func(server string) {
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defer wg.Done()
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if err := h.gatherServer(acc, server); err != nil {
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errorChannel <- err
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}
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}(server)
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}
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wg.Wait()
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@ -130,10 +117,9 @@ func (h *HttpJson) Gather(acc plugins.Accumulator) error {
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// error: Any error that may have occurred
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func (h *HttpJson) gatherServer(
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acc plugins.Accumulator,
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service Service,
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serverURL string,
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) error {
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resp, err := h.sendRequest(service, serverURL)
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resp, err := h.sendRequest(serverURL)
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if err != nil {
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return err
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}
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@ -147,7 +133,7 @@ func (h *HttpJson) gatherServer(
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"server": serverURL,
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}
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for _, tag := range service.TagKeys {
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for _, tag := range h.TagKeys {
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switch v := jsonOut[tag].(type) {
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case string:
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tags[tag] = v
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@ -162,10 +148,10 @@ func (h *HttpJson) gatherServer(
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}
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var msrmnt_name string
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if service.Name == "" {
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if h.Name == "" {
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msrmnt_name = "httpjson"
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} else {
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msrmnt_name = "httpjson_" + service.Name
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msrmnt_name = "httpjson_" + h.Name
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}
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acc.AddFields(msrmnt_name, f.Fields, nil)
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return nil
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@ -178,7 +164,7 @@ func (h *HttpJson) gatherServer(
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// Returns:
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// string: body of the response
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// error : Any error that may have occurred
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func (h *HttpJson) sendRequest(service Service, serverURL string) (string, error) {
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func (h *HttpJson) sendRequest(serverURL string) (string, error) {
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// Prepare URL
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requestURL, err := url.Parse(serverURL)
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if err != nil {
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@ -186,21 +172,23 @@ func (h *HttpJson) sendRequest(service Service, serverURL string) (string, error
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}
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params := url.Values{}
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for k, v := range service.Parameters {
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for k, v := range h.Parameters {
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params.Add(k, v)
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}
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requestURL.RawQuery = params.Encode()
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// Create + send request
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req, err := http.NewRequest(service.Method, requestURL.String(), nil)
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req, err := http.NewRequest(h.Method, requestURL.String(), nil)
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if err != nil {
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return "", err
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}
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defer req.Body.Close()
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resp, err := h.client.MakeRequest(req)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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@ -62,17 +62,6 @@ func (j *Jolokia) SampleConfig() string {
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[[plugins.jolokia.metrics]]
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name = "heap_memory_usage"
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jmx = "/java.lang:type=Memory/HeapMemoryUsage"
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# This drops the 'committed' value from Eden space measurement
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[[plugins.jolokia.metrics]]
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name = "memory_eden"
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jmx = "/java.lang:type=MemoryPool,name=PS Eden Space/Usage"
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# This passes only DaemonThreadCount and ThreadCount
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[[plugins.jolokia.metrics]]
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name = "heap_threads"
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jmx = "/java.lang:type=Threading"
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`
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}
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