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rtdb.go
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rtdb.go
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package register
import (
"context"
"encoding/json"
"fmt"
"path"
"reflect"
"strings"
"cloud.google.com/go/functions/metadata"
)
const (
rtdbPathBase = "projects/_/instances/*/refs"
)
// RealtimeDB returns a new RealtimeDBFunction with the FunctionRegistrar set to the parent
func (f *FunctionRegistrar) RealtimeDB() *RealtimeDBFunction {
s := &RealtimeDBFunction{reg: f}
return s
}
// FindRealtimeDB attempts to match the event and path to a registered RealtimeDB function
// returns the function if found, otherwise nil
// expects the full path name as provided by the CloudEvent: "projects/_/instances/cleanflo-admin/refs/....."
func (f *FunctionRegistrar) findRealtimeDB(event RealtimeDBEventType, ref string) *RealtimeDBFunction {
if f.realtimeDB[event] != nil && len(f.realtimeDB[event]) > 0 {
ref = breakRef(ref)
// collect the registered paths
keys := make(pathKeys, 0, len(f.realtimeDB[event]))
for k := range f.realtimeDB[event] {
keys = append(keys, k)
}
if k := findPath(keys, ref); k != "" {
fx := f.realtimeDB[event][k]
return fx
}
}
return nil
}
// Path creates a path for the RealtimeDB event that can be used for registering a function
// returns the path with all wildcard fields replaced with a *
// and saves a map of the segment positions var names for access within the function
func (r *RealtimeDBFunction) Path() string {
m := make(map[int]string)
pathParts := strings.Split(r.resource, "/")
for i, part := range pathParts {
if match := wildcardRegexp.MatchString(part); match {
pathParts[i] = "*"
m[i] = wildcard(part)
} else if part == "*" {
m[i] = part
}
}
r.pathWildcards = m
return path.Join(pathParts...)
}
// RealtimeDBFunction is a wrapper for the expected data, RealtimeDBFunc and the parent FunctionRegistrar
// Implements the CloudEventFunction interface
type RealtimeDBFunction struct {
cloudDeployer
reg *FunctionRegistrar
fn RealtimeDBFunc
data interface{}
pathWildcards map[int]string
}
// RealtimeDBFunc is the function signature for firebase Realtime Database Cloud Events
type RealtimeDBFunc func(ctx context.Context, e RTDBEvent) error
// Ref appends the given path to the path that the RealtimeDBFunction is executed on
// Meant to be chained
func (r *RealtimeDBFunction) Ref(ref string) *RealtimeDBFunction {
r.resource = path.Join(r.resource, ref)
return r
}
// Write registers the specified function to the RefWriteEvent for firebase Realtime Database CloudEvent
// The provided data is used to populate .Data & .Delta of the RTDBEvent received by the function
//providers/google.firebase.database/eventTypes/ref.write
func (r *RealtimeDBFunction) Write(data interface{}, fn RealtimeDBFunc) *RealtimeDBFunction {
r.fn = fn
r.data = data
if r.reg.realtimeDB[RealtimeDBRefWriteEvent] == nil {
r.reg.realtimeDB[RealtimeDBRefWriteEvent] = make(map[string]*RealtimeDBFunction)
}
r.reg.realtimeDB[RealtimeDBRefWriteEvent][r.Path()] = r
r.event = RealtimeDBRefWriteEvent
r.reg.events[r.Name()] = r
return r
}
// Create registers the specified function to the RefCreateEvent for firebase Realtime Database CloudEvent
// The provided data is used to populate .Data of the RTDBEvent received by the function
//providers/google.firebase.database/eventTypes/ref.create
func (r *RealtimeDBFunction) Create(data interface{}, fn RealtimeDBFunc) *RealtimeDBFunction {
r.fn = fn
r.data = data
if r.reg.realtimeDB[RealtimeDBRefCreateEvent] == nil {
r.reg.realtimeDB[RealtimeDBRefCreateEvent] = make(map[string]*RealtimeDBFunction)
}
r.reg.realtimeDB[RealtimeDBRefCreateEvent][r.Path()] = r
r.event = RealtimeDBRefCreateEvent
r.reg.events[r.Name()] = r
return r
}
// Update registers the specified function to the RefUpdateEvent for firebase Realtime Database CloudEvent
// The provided data is used to populate .Data & .Delta of the RTDBEvent received by the function
//providers/google.firebase.database/eventTypes/ref.update
func (r *RealtimeDBFunction) Update(data interface{}, fn RealtimeDBFunc) *RealtimeDBFunction {
r.fn = fn
r.data = data
if r.reg.realtimeDB[RealtimeDBRefUpdateEvent] == nil {
r.reg.realtimeDB[RealtimeDBRefUpdateEvent] = make(map[string]*RealtimeDBFunction)
}
r.reg.realtimeDB[RealtimeDBRefUpdateEvent][r.Path()] = r
r.event = RealtimeDBRefUpdateEvent
r.reg.events[r.Name()] = r
return r
}
// Delete registers the specified function to the RefDeleteEvent for firebase Realtime Database CloudEvent
// The provided data is used to populate .Delta of the RTDBEvent received by the function
//providers/google.firebase.database/eventTypes/ref.delete
func (r *RealtimeDBFunction) Delete(data interface{}, fn RealtimeDBFunc) *RealtimeDBFunction {
r.fn = fn
r.data = data
if r.reg.realtimeDB[RealtimeDBRefDeleteEvent] == nil {
r.reg.realtimeDB[RealtimeDBRefDeleteEvent] = make(map[string]*RealtimeDBFunction)
}
r.reg.realtimeDB[RealtimeDBRefDeleteEvent][r.Path()] = r
r.event = RealtimeDBRefDeleteEvent
r.reg.events[r.Name()] = r
return r
}
// RTDBEvent is the expected payload of a firebase Realtime Database CloudEvent
type RTDBEvent struct {
vars map[string]string
Data interface{}
Delta interface{}
}
// Vars returns the map of variable name that were registered on the path that matched this function
func (e *RTDBEvent) Vars() map[string]string {
return e.vars
}
// CloudEventFunction
// HandleCloudEvent handles the Firebase RealtimeDB CloudEvent and calls the registered RealtimeDBFunction
func (a *RealtimeDBFunction) HandleCloudEvent(ctx context.Context, md *metadata.Metadata, dec *Decoder) error {
evt := RTDBEvent{}
if a == nil {
return Debug.Errf("no RealtimeDBFunc registered for [%s]: %s", md.EventType, md.Resource.RawPath)
}
var reqData struct {
Data json.RawMessage `json:"data"`
Delta json.RawMessage `json:"delta"`
}
err := dec.Decode(&reqData)
if err != nil {
return Debug.Errf("failed to decode realtimeDB event [%s]: %s: %s", md.EventType, err, string(dec.data))
}
dataType := reflect.TypeOf(a.data)
dataT := reflect.New(dataType)
deltaT := reflect.New(dataType)
err = json.Unmarshal(reqData.Data, dataT.Interface())
if err != nil {
return Debug.Errf("failed to unmarshal realtimeDB event data [%s]: %s: %s", md.EventType, err, string(dec.data))
}
err = json.Unmarshal(reqData.Delta, deltaT.Interface())
if err != nil {
return Debug.Errf("failed to unmarshal realtimeDB event delta [%s]: %s: %s", md.EventType, err, string(dec.data))
}
evt.Data = dataT.Interface()
evt.Delta = deltaT.Interface()
evt.vars = extractVars(breakRef(md.Resource.RawPath), a.pathWildcards)
err = a.fn(ctx, evt)
if err != nil {
return Debug.Errf("registered realtimeDBFunc failed [%s]: %s: RealtimeDBFunc %+v", md.EventType, err, a)
}
return nil
}
// Name returns the name of the function: "rtdb.ref.{write,create,delete,update}-{path-segments}"
func (a *RealtimeDBFunction) Name() string {
return fmt.Sprintf("%s-%s", a.event, normalizeRegexp.ReplaceAllString(a.Resource(), "-$1"))
}
// Resource returns the resource of the function: "ref/{ref-id}/...."
func (a *RealtimeDBFunction) Resource() string {
return a.resource
}
// Event returns the EventType of the function:
// RealtimeDBRefWriteEvent / RealtimeDBRefCreateEvent / RealtimeDBRefUpdateEvent / RealtimeDBRefDeleteEvent
func (a *RealtimeDBFunction) Event() EventType {
return a.event.Type()
}