99 lines
3.3 KiB
Go
99 lines
3.3 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package things
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import (
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"context"
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"github.com/mainflux/mainflux/pkg/errors"
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)
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var (
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// ErrMalformedEntity indicates malformed entity specification (e.g.
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// invalid username or password).
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ErrMalformedEntity = errors.New("malformed entity specification")
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// ErrNotFound indicates a non-existent entity request.
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ErrNotFound = errors.New("non-existent entity")
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// ErrConflict indicates that entity already exists.
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ErrConflict = errors.New("entity already exists")
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// ErrScanMetadata indicates problem with metadata in db
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ErrScanMetadata = errors.New("failed to scan metadata in db")
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// ErrSelectEntity indicates error while reading entity from database
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ErrSelectEntity = errors.New("select entity from db error")
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// ErrEntityConnected indicates error while checking connection in database
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ErrEntityConnected = errors.New("check thing-channel connection in database error")
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)
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// Metadata to be used for mainflux thing or channel for customized
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// describing of particular thing or channel.
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type Metadata map[string]interface{}
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// Thing represents a Mainflux thing. Each thing is owned by one user, and
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// it is assigned with the unique identifier and (temporary) access key.
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type Thing struct {
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ID string
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Owner string
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Name string
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Key string
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Metadata Metadata
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}
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// Page contains page related metadata as well as list of things that
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// belong to this page.
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type Page struct {
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PageMetadata
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Things []Thing
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}
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// ThingRepository specifies a thing persistence API.
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type ThingRepository interface {
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// Save persists multiple things. Things are saved using a transaction. If one thing
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// fails then none will be saved. Successful operation is indicated by non-nil
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// error response.
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Save(ctx context.Context, ths ...Thing) ([]Thing, error)
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// Update performs an update to the existing thing. A non-nil error is
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// returned to indicate operation failure.
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Update(ctx context.Context, t Thing) error
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// UpdateKey updates key value of the existing thing. A non-nil error is
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// returned to indicate operation failure.
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UpdateKey(ctx context.Context, owner, id, key string) error
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// RetrieveByID retrieves the thing having the provided identifier, that is owned
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// by the specified user.
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RetrieveByID(ctx context.Context, owner, id string) (Thing, error)
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// RetrieveByKey returns thing ID for given thing key.
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RetrieveByKey(ctx context.Context, key string) (string, error)
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// RetrieveAll retrieves the subset of things owned by the specified user.
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RetrieveAll(ctx context.Context, owner string, pm PageMetadata) (Page, error)
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// RetrieveByChannel retrieves the subset of things owned by the specified
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// user and connected or not connected to specified channel.
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RetrieveByChannel(ctx context.Context, owner, channel string, offset, limit uint64, connected bool) (Page, error)
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// Remove removes the thing having the provided identifier, that is owned
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// by the specified user.
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Remove(ctx context.Context, owner, id string) error
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}
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// ThingCache contains thing caching interface.
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type ThingCache interface {
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// Save stores pair thing key, thing id.
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Save(context.Context, string, string) error
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// ID returns thing ID for given key.
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ID(context.Context, string) (string, error)
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// Removes thing from cache.
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Remove(context.Context, string) error
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}
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