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api.go
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api.go
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package store
import (
"encoding/json"
"io"
"io/ioutil"
"net/http"
"strconv"
"time"
"github.com/SimonRichardson/coherence/pkg/api"
errs "github.com/SimonRichardson/coherence/pkg/api/http"
"github.com/SimonRichardson/coherence/pkg/metrics"
"github.com/SimonRichardson/coherence/pkg/selectors"
"github.com/SimonRichardson/coherence/pkg/store"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
)
const (
// APIPathInsert represents a way to insert a series or records.
APIPathInsert = "/insert"
// APIPathDelete represents a way to delete a series or records.
APIPathDelete = "/delete"
// APIPathSelect represents a way to select a record.
APIPathSelect = "/select"
// APIPathKeys represents a way to find all the keys with in the cache.
APIPathKeys = "/keys"
// APIPathSize represents a way to find the size of a key with in the cache.
APIPathSize = "/size"
// APIPathMembers represents a way to find all the members for a key with in
// the cache.
APIPathMembers = "/members"
// APIPathScore represents a way to find the score of a field with in a key.
APIPathScore = "/score"
)
// API serves the cache API
type API struct {
store store.Store
logger log.Logger
clients metrics.Gauge
duration metrics.HistogramVec
errors errs.Error
action chan func()
stop chan chan struct{}
}
// NewAPI creates a API with the correct dependencies.
func NewAPI(store store.Store,
logger log.Logger,
clients metrics.Gauge,
duration metrics.HistogramVec,
) *API {
api := &API{
store: store,
logger: logger,
clients: clients,
duration: duration,
errors: errs.NewError(logger),
action: make(chan func()),
stop: make(chan chan struct{}),
}
go api.run()
return api
}
func (a *API) ServeHTTP(w http.ResponseWriter, r *http.Request) {
level.Info(a.logger).Log("method", r.Method, "url", r.URL.String())
iw := &interceptingWriter{http.StatusOK, w}
w = iw
// Metrics
a.clients.Inc()
defer a.clients.Dec()
defer func(begin time.Time) {
a.duration.WithLabelValues(
r.Method,
r.URL.Path,
strconv.Itoa(iw.code),
).Observe(time.Since(begin).Seconds())
}(time.Now())
// Routing table
method, path := r.Method, r.URL.Path
switch {
case method == "POST" && path == APIPathInsert:
a.handleInsertion(w, r)
case method == "POST" && path == APIPathDelete:
a.handleDeletion(w, r)
case method == "GET" && path == APIPathSelect:
a.handleSelect(w, r)
case method == "GET" && path == APIPathKeys:
a.handleKeys(w, r)
case method == "GET" && path == APIPathSize:
a.handleSize(w, r)
case method == "GET" && path == APIPathMembers:
a.handleMembers(w, r)
case method == "GET" && path == APIPathScore:
a.handleScore(w, r)
default:
// Nothing found
a.errors.NotFound(w, r)
}
}
func (a *API) run() {
for {
select {
case f := <-a.action:
f()
case c := <-a.stop:
close(c)
return
}
}
}
// Close out the API
func (a *API) Close() {
c := make(chan struct{})
a.stop <- c
<-c
}
func (a *API) handleInsertion(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryRequired); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
members, err := ingestMembers(r.Body)
if err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
var (
internalError = make(chan error)
result = make(chan selectors.ChangeSet)
)
a.action <- func() {
changeSet, err := a.store.Insert(qp.Key(), members)
if err != nil {
internalError <- err
return
}
result <- changeSet
}
select {
case err := <-internalError:
a.errors.Error(w, err.Error(), http.StatusInternalServerError)
case changeSet := <-result:
// Make sure we collect the document for the result.
qr := ChangeSetQueryResult{Errors: a.errors, Params: qp}
qr.ChangeSet = changeSet
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
}
func (a *API) handleDeletion(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryRequired); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
members, err := ingestMembers(r.Body)
if err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
var (
internalError = make(chan error)
result = make(chan selectors.ChangeSet)
)
a.action <- func() {
changeSet, err := a.store.Delete(qp.Key(), members)
if err != nil {
internalError <- err
return
}
result <- changeSet
}
select {
case err := <-internalError:
a.errors.Error(w, err.Error(), http.StatusInternalServerError)
case changeSet := <-result:
// Make sure we collect the document for the result.
qr := ChangeSetQueryResult{Errors: a.errors, Params: qp}
qr.ChangeSet = changeSet
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
}
func (a *API) handleSelect(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyFieldQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryOptional); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
member, err := a.store.Select(qp.Key(), qp.Field())
if err != nil {
if selectors.NotFoundError(err) {
a.errors.NotFound(w, r)
} else {
a.errors.InternalServerError(w, r, err.Error())
}
return
}
// Make sure we collect the document for the result.
qr := FieldValueScoreQueryResult{Errors: a.errors, Params: qp}
qr.FieldValueScore = member
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
func (a *API) handleKeys(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
keys, err := a.store.Keys()
if err != nil {
a.errors.InternalServerError(w, r, err.Error())
return
}
// Make sure we collect the document for the result.
qr := KeysQueryResult{Errors: a.errors}
qr.Keys = keys
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
func (a *API) handleSize(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryOptional); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
size, err := a.store.Size(qp.Key())
if err != nil {
a.errors.InternalServerError(w, r, err.Error())
return
}
// Make sure we collect the document for the result.
qr := Int64QueryResult{Errors: a.errors, Params: qp}
qr.Integer = size
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
func (a *API) handleMembers(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryOptional); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
members, err := a.store.Members(qp.Key())
if err != nil {
a.errors.InternalServerError(w, r, err.Error())
return
}
// Make sure we collect the document for the result.
qr := FieldsQueryResult{Errors: a.errors, Params: qp}
qr.Fields = members
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
func (a *API) handleScore(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
// useful metrics
begin := time.Now()
// Validate user input.
var qp KeyFieldQueryParams
if err := qp.DecodeFrom(r.URL, r.Header, queryOptional); err != nil {
a.errors.BadRequest(w, r, err.Error())
return
}
presence, err := a.store.Score(qp.Key(), qp.Field())
if err != nil {
a.errors.InternalServerError(w, r, err.Error())
return
}
// Make sure we collect the document for the result.
qr := PresenceQueryResult{Errors: a.errors, Params: qp}
qr.Presence = presence
// Finish
qr.Duration = time.Since(begin).String()
qr.EncodeTo(w)
}
type interceptingWriter struct {
code int
http.ResponseWriter
}
func (iw *interceptingWriter) WriteHeader(code int) {
iw.code = code
iw.ResponseWriter.WriteHeader(code)
}
func ingestMembers(reader io.ReadCloser) ([]selectors.FieldValueScore, error) {
bytes, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
if len(bytes) < 1 {
return nil, errors.New("no body content")
}
var input api.MembersInput
if err = json.Unmarshal(bytes, &input); err != nil {
return nil, err
}
res := make([]selectors.FieldValueScore, len(input.Members))
for k, v := range input.Members {
res[k] = selectors.FieldValueScore{
Field: selectors.Field(v.Field),
Value: v.Value,
Score: v.Score,
}
}
return res, nil
}