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82b5a1d4ed
Prev Commit: 49ee8f2d75 [formerly 6a3579f2500fc715d7dc606478960946dcade61d]
Changelog: https://github.com/kataras/iris/blob/master/HISTORY.md#mo-09-october-2017--v850
This example is updated with the current commit: https://github.com/kataras/iris/tree/master/_examples/mvc/using-output-result
Former-commit-id: 29486ef014b3667fa1c7c66e11c8e95c76a37e57
115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
package user
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import (
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"errors"
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"sync"
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"time"
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)
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// IDGenerator would be our user ID generator
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// but here we keep the order of users by their IDs
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// so we will use numbers that can be easly written
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// to the browser to get results back from the REST API.
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// var IDGenerator = func() string {
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// return uuid.NewV4().String()
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// }
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// DataSource is our data store example.
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type DataSource struct {
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Users map[int64]Model
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mu sync.RWMutex
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}
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// NewDataSource returns a new user data source.
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func NewDataSource() *DataSource {
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return &DataSource{
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Users: make(map[int64]Model),
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}
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}
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// GetBy receives a query function
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// which is fired for every single user model inside
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// our imaginary database.
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// When that function returns true then it stops the iteration.
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//
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// It returns the query's return last known boolean value
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// and the last known user model
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// to help callers to reduce the loc.
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//
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// But be carefully, the caller should always check for the "found"
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// because it may be false but the user model has actually real data inside it.
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//
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// It's actually a simple but very clever prototype function
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// I'm think of and using everywhere since then,
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// hope you find it very useful too.
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func (d *DataSource) GetBy(query func(Model) bool) (user Model, found bool) {
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d.mu.RLock()
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for _, user = range d.Users {
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found = query(user)
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if found {
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break
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}
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}
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d.mu.RUnlock()
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return
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}
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// GetByID returns a user model based on its ID.
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func (d *DataSource) GetByID(id int64) (Model, bool) {
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return d.GetBy(func(u Model) bool {
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return u.ID == id
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})
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}
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// GetByUsername returns a user model based on the Username.
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func (d *DataSource) GetByUsername(username string) (Model, bool) {
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return d.GetBy(func(u Model) bool {
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return u.Username == username
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})
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}
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func (d *DataSource) getLastID() (lastID int64) {
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d.mu.RLock()
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for id := range d.Users {
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if id > lastID {
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lastID = id
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}
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}
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d.mu.RUnlock()
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return lastID
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}
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// InsertOrUpdate adds or updates a user to the (memory) storage.
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func (d *DataSource) InsertOrUpdate(user Model) (Model, error) {
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// no matter what we will update the password hash
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// for both update and insert actions.
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hashedPassword, err := GeneratePassword(user.password)
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if err != nil {
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return user, err
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}
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user.HashedPassword = hashedPassword
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// update
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if id := user.ID; id > 0 {
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_, found := d.GetByID(id)
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if !found {
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return user, errors.New("ID should be zero or a valid one that maps to an existing User")
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}
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d.mu.Lock()
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d.Users[id] = user
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d.mu.Unlock()
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return user, nil
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}
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// insert
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id := d.getLastID() + 1
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user.ID = id
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d.mu.Lock()
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user.CreatedAt = time.Now()
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d.Users[id] = user
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d.mu.Unlock()
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return user, nil
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}
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