sklad: create, update, remove
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@ -2,6 +2,22 @@
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*/}}{{ if .Container }}{{ .Container.Id }}{{ else }}Obaly{{ end }}{{ end }}
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{{ define "Content" }}
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{{ if .ErrorNoSuchSeries }}
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<p>Chyba: Řada neexistuje.
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{{ else if .ErrorContainerAlreadyExists }}
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<p>Chyba: Obal s tímto ID už existuje.
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{{ else if .ErrorNoSuchContainer }}
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<p>Chyba: Obal neexistuje.
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{{ else if .ErrorCannotChangeSeriesNotEmpty }}
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<p>Chyba: Řadu u neprázdných obalů nelze měnit.
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{{ else if .ErrorCannotChangeNumber }}
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<p>Chyba: Číslo obalu v řadě nelze měnit.
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{{ else if .ErrorContainerInUse }}
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<p>Chyba: Obal se používá.
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{{ else if .Error }}
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<p>Chyba: {{ .Error }}
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{{ end }}
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{{ if .Container }}
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<section>
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132
cmd/sklad/db.go
132
cmd/sklad/db.go
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@ -14,6 +14,7 @@ import (
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type Series struct {
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Prefix string // PK: prefix
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Description string // what kind of containers this is for
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Counter uint // last used container number
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}
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func (s *Series) Containers() []*Container {
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@ -71,9 +72,6 @@ var (
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labelFont *bdf.Font
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)
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// TODO: Some functions to add, remove and change things in the database.
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// Indexes must be kept valid, just like any invariants.
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func dbSearchSeries(query string) (result []*Series) {
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query = strings.ToLower(query)
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added := map[string]bool{}
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@ -110,6 +108,134 @@ func dbSearchContainers(query string) (result []*Container) {
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return
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}
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var errInvalidPrefix = errors.New("invalid prefix")
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var errSeriesAlreadyExists = errors.New("series already exists")
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var errCannotChangePrefix = errors.New("cannot change the prefix")
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var errNoSuchSeries = errors.New("no such series")
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var errSeriesInUse = errors.New("series is in use")
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// Find and filter out the series in O(n).
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func filterSeries(slice []*Series, s *Series) (filtered []*Series) {
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for _, series := range slice {
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if s != series {
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filtered = append(filtered, series)
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}
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}
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return
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}
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func dbSeriesCreate(s *Series) error {
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if s.Prefix == "" {
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return errInvalidPrefix
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}
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if _, ok := indexSeries[s.Prefix]; ok {
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return errSeriesAlreadyExists
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}
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db.Series = append(db.Series, s)
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indexSeries[s.Prefix] = s
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return dbCommit()
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}
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func dbSeriesUpdate(s *Series, updated Series) error {
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// It might be easily possible with no members, though this
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// is not reachable from the UI and can be solved by deletion.
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if updated.Prefix != s.Prefix {
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return errCannotChangePrefix
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}
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*s = updated
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return dbCommit()
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}
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func dbSeriesRemove(s *Series) error {
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if len(s.Containers()) > 0 {
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return errSeriesInUse
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}
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db.Series = filterSeries(db.Series, s)
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delete(indexSeries, s.Prefix)
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delete(indexMembers, s.Prefix)
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return dbCommit()
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}
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var errContainerAlreadyExists = errors.New("container already exists")
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var errNoSuchContainer = errors.New("no such container")
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var errCannotChangeSeriesNotEmpty = errors.New(
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"cannot change the series of a non-empty container")
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var errCannotChangeNumber = errors.New("cannot change the number")
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var errContainerInUse = errors.New("container is in use")
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// Find and filter out the container in O(n).
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func filterContainer(slice []*Container, c *Container) (filtered []*Container) {
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for _, container := range slice {
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if c != container {
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filtered = append(filtered, container)
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}
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}
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return
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}
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func dbContainerCreate(c *Container) error {
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if series, ok := indexSeries[c.Series]; !ok {
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return errNoSuchSeries
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} else if c.Number == 0 {
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c.Number = series.Counter
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for {
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c.Number++
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if _, ok := indexContainer[c.Id()]; !ok {
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break
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}
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}
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series.Counter = c.Number
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}
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if _, ok := indexContainer[c.Id()]; ok {
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return errContainerAlreadyExists
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}
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if c.Parent != "" && indexContainer[c.Parent] == nil {
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return errNoSuchContainer
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}
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db.Containers = append(db.Containers, c)
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indexMembers[c.Series] = append(indexMembers[c.Series], c)
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indexChildren[c.Parent] = append(indexChildren[c.Parent], c)
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indexContainer[c.Id()] = c
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return dbCommit()
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}
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func dbContainerUpdate(c *Container, updated Container) error {
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newId := updated.Id()
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if updated.Series != c.Series && len(c.Children()) > 0 {
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return errCannotChangeSeriesNotEmpty
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}
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if updated.Number != c.Number {
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return errCannotChangeNumber
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}
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if _, ok := indexContainer[newId]; ok && newId != c.Id() {
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return errContainerAlreadyExists
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}
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if updated.Parent != c.Parent {
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indexChildren[c.Parent] = filterContainer(indexChildren[c.Parent], c)
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indexChildren[newId] = append(indexChildren[newId], c)
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}
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*c = updated
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return dbCommit()
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}
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func dbContainerRemove(c *Container) error {
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if len(indexChildren[c.Id()]) > 0 {
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return errContainerInUse
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}
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db.Containers = filterContainer(db.Containers, c)
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indexMembers[c.Series] = filterContainer(indexMembers[c.Series], c)
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indexChildren[c.Parent] = filterContainer(indexChildren[c.Parent], c)
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delete(indexContainer, c.Id())
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delete(indexChildren, c.Id())
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return dbCommit()
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}
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func dbCommit() error {
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// Write a timestamp.
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e := json.NewEncoder(dbLog)
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@ -7,6 +7,7 @@ import (
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"log"
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"math/rand"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"time"
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@ -83,11 +84,40 @@ func handleLogout(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, "/", http.StatusSeeOther)
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}
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func handleContainer(w http.ResponseWriter, r *http.Request) {
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if r.Method == http.MethodPost {
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// TODO
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func handleContainerPost(r *http.Request) error {
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id := ContainerId(r.FormValue("id"))
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description := r.FormValue("description")
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series := r.FormValue("series")
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parent := ContainerId(r.FormValue("parent"))
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_, remove := r.Form["remove"]
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if container, ok := indexContainer[id]; ok {
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if remove {
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return dbContainerRemove(container)
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} else {
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c := *container
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c.Description = description
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c.Series = series
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return dbContainerUpdate(container, c)
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}
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} else if remove {
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return errNoSuchContainer
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} else {
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return dbContainerCreate(&Container{
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Series: series,
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Parent: parent,
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Description: description,
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})
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}
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if r.Method != http.MethodGet {
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}
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func handleContainer(w http.ResponseWriter, r *http.Request) {
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var err error
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if r.Method == http.MethodPost {
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err = handleContainerPost(r)
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// XXX: This is rather ugly. When removing, we want to keep
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// the context id, in addition to the id being changed.
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} else if r.Method != http.MethodGet {
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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@ -98,33 +128,70 @@ func handleContainer(w http.ResponseWriter, r *http.Request) {
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}
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var container *Container
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children := []*Container{}
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children := indexChildren[""]
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if id := ContainerId(r.FormValue("id")); id == "" {
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children = indexChildren[""]
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} else if c, ok := indexContainer[id]; ok {
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if c, ok := indexContainer[ContainerId(r.FormValue("id"))]; ok {
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children = c.Children()
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container = c
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}
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params := struct {
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Container *Container
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Children []*Container
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AllSeries map[string]string
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Error error
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ErrorNoSuchSeries bool
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ErrorContainerAlreadyExists bool
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ErrorNoSuchContainer bool
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ErrorCannotChangeSeriesNotEmpty bool
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ErrorCannotChangeNumber bool
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ErrorContainerInUse bool
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Container *Container
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Children []*Container
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AllSeries map[string]string
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}{
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Container: container,
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Children: children,
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AllSeries: allSeries,
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Error: err,
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ErrorNoSuchSeries: err == errNoSuchSeries,
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ErrorContainerAlreadyExists: err == errContainerAlreadyExists,
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ErrorNoSuchContainer: err == errNoSuchContainer,
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ErrorCannotChangeSeriesNotEmpty: err == errCannotChangeSeriesNotEmpty,
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ErrorCannotChangeNumber: err == errCannotChangeNumber,
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ErrorContainerInUse: err == errContainerInUse,
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Container: container,
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Children: children,
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AllSeries: allSeries,
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}
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executeTemplate("container.tmpl", w, ¶ms)
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}
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func handleSeries(w http.ResponseWriter, r *http.Request) {
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if r.Method == http.MethodPost {
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// TODO
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func handleSeriesPost(r *http.Request) error {
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prefix := r.FormValue("prefix")
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description := r.FormValue("description")
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_, remove := r.Form["remove"]
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if series, ok := indexSeries[prefix]; ok {
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if remove {
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return dbSeriesRemove(series)
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} else {
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s := *series
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s.Description = description
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return dbSeriesUpdate(series, s)
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}
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} else if remove {
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return errNoSuchSeries
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} else {
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return dbSeriesCreate(&Series{
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Prefix: prefix,
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Description: description,
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})
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}
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if r.Method != http.MethodGet {
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}
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func handleSeries(w http.ResponseWriter, r *http.Request) {
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var err error
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if r.Method == http.MethodPost {
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err = handleSeriesPost(r)
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// XXX: This is rather ugly.
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r.Form = url.Values{}
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} else if r.Method != http.MethodGet {
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w.WriteHeader(http.StatusMethodNotAllowed)
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return
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}
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@ -140,16 +207,30 @@ func handleSeries(w http.ResponseWriter, r *http.Request) {
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if prefix == "" {
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} else if series, ok := indexSeries[prefix]; ok {
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description = series.Description
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} else {
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err = errNoSuchSeries
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}
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params := struct {
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Prefix string
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Description string
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AllSeries map[string]*Series
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Error error
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ErrorInvalidPrefix bool
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ErrorSeriesAlreadyExists bool
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ErrorCannotChangePrefix bool
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ErrorNoSuchSeries bool
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ErrorSeriesInUse bool
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Prefix string
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Description string
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AllSeries map[string]*Series
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}{
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Prefix: prefix,
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Description: description,
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AllSeries: allSeries,
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Error: err,
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ErrorInvalidPrefix: err == errInvalidPrefix,
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ErrorSeriesAlreadyExists: err == errSeriesAlreadyExists,
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ErrorCannotChangePrefix: err == errCannotChangePrefix,
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ErrorNoSuchSeries: err == errNoSuchSeries,
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ErrorSeriesInUse: err == errSeriesInUse,
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Prefix: prefix,
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Description: description,
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AllSeries: allSeries,
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}
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executeTemplate("series.tmpl", w, ¶ms)
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@ -1,6 +1,20 @@
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{{ define "Title" }}{{ or .Prefix "Řady" }}{{ end }}
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{{ define "Content" }}
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{{ if .ErrorInvalidPrefix }}
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<p>Chyba: Neplatný prefix.
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{{ else if .ErrorSeriesAlreadyExists }}
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<p>Chyba: Řada s tímto prefixem už existuje.
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{{ else if .ErrorCannotChangePrefix }}
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<p>Chyba: Prefix nelze měnit.
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{{ else if .ErrorNoSuchSeries }}
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<p>Chyba: Řada neexistuje.
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{{ else if .ErrorSeriesInUse }}
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<p>Chyba: Řada se používá.
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{{ else if .Error }}
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<p>Chyba: {{ .Error }}
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{{ end }}
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{{ if .Prefix }}
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<h2>{{ .Prefix }}</h2>
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