Start back end and skeleton front end
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8
go.mod
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8
go.mod
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module gitlab.codemonkeysoftware.net/b/henwen
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go 1.14
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require (
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crawshaw.io/sqlite v0.2.5
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gitlab.codemonkeysoftware.net/b/hatmill v0.0.5
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)
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6
go.sum
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6
go.sum
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crawshaw.io/iox v0.0.0-20181124134642-c51c3df30797/go.mod h1:sXBiorCo8c46JlQV3oXPKINnZ8mcqnye1EkVkqsectk=
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crawshaw.io/sqlite v0.2.5 h1:lUjWtEQJZApoL4V83cHsNeaGZkY5Ofmh8cGGBdZNxPU=
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crawshaw.io/sqlite v0.2.5/go.mod h1:igAO5JulrQ1DbdZdtVq48mnZUBAPOeFzer7VhDWNtW4=
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github.com/leanovate/gopter v0.2.4/go.mod h1:gNcbPWNEWRe4lm+bycKqxUYoH5uoVje5SkOJ3uoLer8=
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gitlab.codemonkeysoftware.net/b/hatmill v0.0.5 h1:7L70G1Qmdm7bSwH58qWY5psXOwoqcvokLhc4BPSIjWo=
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gitlab.codemonkeysoftware.net/b/hatmill v0.0.5/go.mod h1:3jggrD9qkK8kXt0d3+Kwg3zti2PfPcociz7r3oxtjWU=
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121
http/server.go
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121
http/server.go
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package main
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import (
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"fmt"
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"io"
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"log"
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"net/http"
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"time"
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h "gitlab.codemonkeysoftware.net/b/hatmill"
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a "gitlab.codemonkeysoftware.net/b/hatmill/attribute"
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e "gitlab.codemonkeysoftware.net/b/hatmill/element"
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_ "gitlab.codemonkeysoftware.net/b/henwen"
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)
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const Addr = ":8080"
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const Title = "Henwen"
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const (
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PathRoot = "/"
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PathCreate = "/create"
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PathDoCreate = "/create/do"
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)
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func writePage(w io.Writer, contents h.Term) error {
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page := e.Html()(
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e.Head()(
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e.Title()(h.Text(Title)),
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),
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e.Body()(
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e.H1()(h.Text(Title)),
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e.Div()(contents),
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),
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)
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_, err := h.WriteDocument(w, page)
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return err
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}
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func pageRoot() h.Term {
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return h.Terms{
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e.H2()(h.Text("Welcome!")),
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e.A(a.Href(PathCreate))(
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h.Text("Create event"),
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),
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}
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}
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const (
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fieldNameEarliest = "earliestDate"
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fieldNameLatest = "latestDate"
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fieldNameEventName = "eventName"
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)
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func pageCreate() h.Term {
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return h.Terms{
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e.H2()(h.Text("Create an event")),
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e.Form(a.Action(PathDoCreate), a.Method("POST"))(
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e.Label(a.For(fieldNameEventName))(h.Text("Event name")),
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e.Input(a.Name(fieldNameEventName)),
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e.Label(a.For(fieldNameEarliest))(h.Text("Earliest date")),
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e.Input(a.Name(fieldNameEarliest), a.Type("date")),
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e.Label(a.For(fieldNameLatest))(h.Text("Latest date")),
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e.Input(a.Name(fieldNameLatest), a.Type("date")),
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e.Input(a.Type("submit")),
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),
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}
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}
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func pageDoCreate(name string, earliest, latest time.Time) h.Term {
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return h.Terms{
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e.H2()(h.Text("Created event!")),
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e.H3()(h.Text("Name")),
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h.Text(name),
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e.H3()(h.Text("Earliest date")),
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h.Text(earliest.Format(time.ANSIC)),
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e.H3()(h.Text("Latest date")),
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h.Text(latest.Format(time.ANSIC)),
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}
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}
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func main() {
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mux := http.NewServeMux()
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mux.HandleFunc(PathRoot, func(w http.ResponseWriter, r *http.Request) {
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_ = writePage(w, pageRoot())
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})
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mux.HandleFunc(PathCreate, func(w http.ResponseWriter, r *http.Request) {
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_ = writePage(w, pageCreate())
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})
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mux.HandleFunc(PathDoCreate, func(w http.ResponseWriter, r *http.Request) {
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const dateFmt = "2006-01-02"
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earliest, err := time.Parse(dateFmt, r.FormValue(fieldNameEarliest))
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if err != nil {
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fmt.Fprint(w, "bad earliest date")
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return
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}
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latest, err := time.Parse(dateFmt, r.FormValue(fieldNameLatest))
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if err != nil {
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fmt.Fprint(w, "bad latest date")
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return
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}
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eventName := r.FormValue(fieldNameEventName)
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if eventName == "" {
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fmt.Fprint(w, "event name is required")
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return
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}
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_ = writePage(w, pageDoCreate(eventName, earliest, latest))
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})
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srv := http.Server{
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Addr: Addr,
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Handler: mux,
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}
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log.Println(srv.ListenAndServe())
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}
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131
store.go
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131
store.go
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package henwen
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import (
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"context"
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"os"
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"time"
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"crawshaw.io/sqlite/sqlitex"
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)
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type GenString func() (string, error)
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type Store struct {
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pool *sqlitex.Pool
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genString GenString
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}
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const InMemory = ":memory:"
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func NewStore(filename string, genString GenString) (*Store, error) {
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var needCreate bool
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if filename == InMemory {
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filename = "file::memory:?mode=memory"
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needCreate = true
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} else if _, err := os.Stat(filename); os.IsNotExist(err) {
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needCreate = true
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}
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// If the file exists, then assume it was created properly.
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pool, err := sqlitex.Open(filename, 0, 10)
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if err != nil {
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return nil, err
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}
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store := &Store{
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pool: pool,
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genString: genString,
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}
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if needCreate {
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err = store.createSchema()
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if err != nil {
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defer pool.Close()
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return nil, err
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}
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}
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return store, nil
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}
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func (s *Store) Close() error {
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return s.pool.Close()
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}
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const schema = `
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CREATE TABLE event (
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id INTEGER PRIMARY KEY,
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alpha_id TEXT NOT NULL,
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admin_alpha_id TEXT NOT NULL,
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name TEXT NOT NULL,
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earliest_date DATE NOT NULL,
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latest_date DATE NOT NULL,
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duration INTEGER NOT NULL,
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UNIQUE (alpha_id)
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);
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CREATE TABLE response (
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id INTEGER PRIMARY KEY,
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alpha_id TEXT NOT NULL,
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event_id INTEGER NOT NULL,
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UNIQUE (alpha_id),
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FOREIGN KEY (event_id) REFERENCES event(id)
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);
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CREATE TABLE response_time (
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response_id INTEGER PRIMARY KEY,
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time INTEGER NOT NULL,
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CHECK (0 <= time < 24)
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);`
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func (s *Store) createSchema() error {
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conn := s.pool.Get(context.Background())
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defer s.pool.Put(conn)
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return sqlitex.ExecScript(conn, schema)
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}
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type CreateEventCommand struct {
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Name string
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EarliestDate, LatestDate time.Time
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Duration int
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}
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type CreateEventResult struct {
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AlphaID, AdminAlphaID string
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}
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func (s *Store) CreateEvent(ctx context.Context, cmd CreateEventCommand) (result CreateEventResult, err error) {
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conn := s.pool.Get(ctx)
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defer s.pool.Put(conn)
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alphaID, err := s.genString()
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if err != nil {
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return
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}
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adminAlphaID, err := s.genString()
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if err != nil {
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return
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}
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const dateFmt = "2006-01-02"
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const query = `
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INSERT INTO event(alpha_id, admin_alpha_id, name, earliest_date, latest_date, duration)
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VALUES (?, ?, ?, ?, ?, ?);`
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err = sqlitex.Exec(conn, query, nil,
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alphaID,
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adminAlphaID,
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cmd.Name,
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cmd.EarliestDate.Format(dateFmt),
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cmd.LatestDate.Format(dateFmt),
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cmd.Duration,
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)
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if err != nil {
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return
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}
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result.AdminAlphaID = adminAlphaID
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result.AlphaID = alphaID
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return
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}
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