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recorder.go
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recorder.go
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package instance
import (
"bytes"
"encoding/json"
"net/http"
"strings"
"github.com/TIBCOSoftware/flogo-contrib/action/flow/service"
"github.com/TIBCOSoftware/flogo-lib/logger"
"github.com/TIBCOSoftware/flogo-lib/util"
)
// StateRecorder is the interface that describes a service that can record
// snapshots and steps of a Flow Instance
type StateRecorder interface {
// RecordSnapshot records a Snapshot of the FlowInstance
RecordSnapshot(instance *IndependentInstance)
// RecordStep records the changes for the current Step of the Flow Instance
RecordStep(instance *IndependentInstance)
}
// RemoteStateRecorder is an implementation of StateRecorder service
// that can access flows via URI
type RemoteStateRecorder struct {
host string
enabled bool
}
// NewRemoteStateRecorder creates a new RemoteStateRecorder
func NewRemoteStateRecorder(config *util.ServiceConfig) *RemoteStateRecorder {
recorder := &RemoteStateRecorder{enabled: config.Enabled}
recorder.init(config.Settings)
return recorder
}
func (sr *RemoteStateRecorder) Name() string {
return service.ServiceStateRecorder
}
func (sr *RemoteStateRecorder) Enabled() bool {
return sr.enabled
}
// Start implements util.Managed.Start()
func (sr *RemoteStateRecorder) Start() error {
// no-op
return nil
}
// Stop implements util.Managed.Stop()
func (sr *RemoteStateRecorder) Stop() error {
// no-op
return nil
}
// Init implements services.StateRecorderService.Init()
func (sr *RemoteStateRecorder) init(settings map[string]string) {
host, set := settings["host"]
port, set := settings["port"]
if !set {
panic("RemoteStateRecorder: required setting 'host' not set")
}
if strings.Index(host, "http") != 0 {
sr.host = "http://" + host + ":" + port
} else {
sr.host = host + ":" + port
}
logger.Debugf("RemoteStateRecorder: StateRecorder Server = %s", sr.host)
}
// RecordSnapshot implements instance.StateRecorder.RecordSnapshot
func (sr *RemoteStateRecorder) RecordSnapshot(instance *IndependentInstance) {
storeReq := &RecordSnapshotReq{
ID: instance.StepID(),
FlowID: instance.ID(),
Status: int(instance.Status()),
SnapshotData: instance,
}
uri := sr.host + "/instances/snapshot"
logger.Debugf("POST Snapshot: %s\n", uri)
jsonReq, _ := json.Marshal(storeReq)
logger.Debug("JSON: ", string(jsonReq))
req, err := http.NewRequest("POST", uri, bytes.NewBuffer(jsonReq))
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
logger.Debug("response Status:", resp.Status)
if resp.StatusCode >= 300 {
//error
}
}
// RecordStep implements instance.StateRecorder.RecordStep
func (sr *RemoteStateRecorder) RecordStep(instance *IndependentInstance) {
storeReq := &RecordStepReq{
ID: instance.StepID(),
FlowID: instance.ID(),
Status: int(instance.Status()),
StepData: instance.ChangeTracker,
FlowURI: instance.flowURI,
}
uri := sr.host + "/instances/steps"
logger.Debugf("POST Step: %s\n", uri)
jsonReq, _ := json.Marshal(storeReq)
logger.Debug("JSON: ", string(jsonReq))
req, err := http.NewRequest("POST", uri, bytes.NewBuffer(jsonReq))
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
logger.Debug("response Status:", resp.Status)
if resp.StatusCode >= 300 {
//error
}
}
// RecordSnapshotReq serializable representation of the RecordSnapshot request
type RecordSnapshotReq struct {
ID int `json:"id"`
FlowID string `json:"flowID"`
State int `json:"state"`
Status int `json:"status"`
SnapshotData *IndependentInstance `json:"snapshotData"`
}
// RecordStepReq serializable representation of the RecordStep request
type RecordStepReq struct {
ID int `json:"id"`
FlowID string `json:"flowID"`
//todo should move to the "stepData"
State int `json:"state"`
Status int `json:"status"`
//todo we should have initial "init" to associate flowURI with flowID, instead of at every step
FlowURI string `json:"flowURI"`
StepData *InstanceChangeTracker `json:"stepData"`
}
func DefaultConfig() *util.ServiceConfig {
return &util.ServiceConfig{Name: service.ServiceStateRecorder, Enabled: true, Settings: map[string]string{"host": ""}}
}