410 lines
12 KiB
Go
410 lines
12 KiB
Go
package store
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import (
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"context"
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"errors"
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"time"
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"github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgconn"
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)
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// Admin shapes carry the raw column values, unlike the public ones: the editor
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// has to round-trip DRAFT and ELUTASITVA, which never reach a visitor.
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type AdminCampaignRow struct {
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ID string `json:"id"`
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Slug string `json:"slug"`
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Title string `json:"title"`
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Status string `json:"status"`
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GoalAmount int `json:"goalAmount"`
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Owner string `json:"owner"`
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PledgeCount int `json:"pledgeCount"`
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}
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// Owner is the person a campaign belongs to. Always a person — the table was
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// called Organization until migration 0003.
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type Owner struct {
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ID string `json:"id"`
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Name string `json:"name"`
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// Carried so an owner editor can show and change the photo. Empty means the
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// organisation has none and its initials are used instead.
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AvatarURL string `json:"avatarUrl,omitempty"`
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}
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type AdminTier struct {
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ID string `json:"id"`
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Type string `json:"type"`
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Price int `json:"price"`
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ListPrice *int `json:"listPrice"`
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Title string `json:"title"`
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Includes []string `json:"includes"`
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InventoryLimit *int `json:"inventoryLimit"`
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EstimatedDelivery string `json:"estimatedDelivery"`
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Featured bool `json:"featured"`
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// PledgeCount is why a tier may refuse to be deleted, so the editor needs
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// it to explain itself before the user tries.
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PledgeCount int `json:"pledgeCount"`
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}
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type AdminCampaign struct {
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ID string `json:"id"`
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Slug string `json:"slug"`
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Title string `json:"title"`
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Category string `json:"category"`
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Summary string `json:"summary"`
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Art string `json:"art"`
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GoalAmount int `json:"goalAmount"`
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EndsAt string `json:"endsAt"`
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Status string `json:"status"`
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OwnerID string `json:"ownerId"`
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Story []StorySection `json:"story"`
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Tiers []AdminTier `json:"tiers"`
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}
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// ErrSlugTaken and ErrHasPledges are the two failures the editor has to
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// explain in Hungarian rather than as a 500.
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var (
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ErrSlugTaken = errors.New("slug already taken")
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ErrHasPledges = errors.New("campaign has pledges")
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)
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func (s *Store) ListAdminCampaigns(ctx context.Context) ([]AdminCampaignRow, error) {
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rows, err := s.pool.Query(ctx, `
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SELECT c."id", c."slug", c."title", c."status"::text, c."goalAmount", o."name",
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(SELECT COUNT(*) FROM "Pledge" p WHERE p."campaignId" = c."id")::int
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FROM "Campaign" c
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JOIN "Owner" o ON o."id" = c."ownerId"
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ORDER BY c."createdAt" DESC`)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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out := []AdminCampaignRow{}
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for rows.Next() {
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var r AdminCampaignRow
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if err := rows.Scan(&r.ID, &r.Slug, &r.Title, &r.Status, &r.GoalAmount,
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&r.Owner, &r.PledgeCount); err != nil {
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return nil, err
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}
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out = append(out, r)
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}
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return out, rows.Err()
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}
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func (s *Store) ListOwners(ctx context.Context) ([]Owner, error) {
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rows, err := s.pool.Query(ctx,
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`SELECT "id", "name", COALESCE("avatarUrl", '') FROM "Owner" ORDER BY "name" ASC`)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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out := []Owner{}
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for rows.Next() {
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var o Owner
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if err := rows.Scan(&o.ID, &o.Name, &o.AvatarURL); err != nil {
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return nil, err
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}
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out = append(out, o)
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}
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return out, rows.Err()
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}
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func (s *Store) GetAdminCampaign(ctx context.Context, slug string) (*AdminCampaign, error) {
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var c AdminCampaign
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var endsAt time.Time
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err := s.pool.QueryRow(ctx, `
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SELECT "id", "slug", "title", "category", "summary", "art", "goalAmount",
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"endsAt", "status"::text, "ownerId"
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FROM "Campaign" WHERE "slug" = $1`, slug).Scan(
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&c.ID, &c.Slug, &c.Title, &c.Category, &c.Summary, &c.Art, &c.GoalAmount,
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&endsAt, &c.Status, &c.OwnerID)
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if errors.Is(err, pgx.ErrNoRows) {
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return nil, ErrNotFound
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}
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if err != nil {
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return nil, err
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}
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c.EndsAt = s.Day(endsAt)
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if c.Story, err = s.storySections(ctx, c.ID); err != nil {
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return nil, err
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}
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rows, err := s.pool.Query(ctx, `
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SELECT t."id", t."type"::text, t."price", t."listPrice", t."title", t."includes",
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t."inventoryLimit", t."estimatedDelivery", t."featured",
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(SELECT COUNT(*) FROM "Pledge" p WHERE p."tierId" = t."id")::int
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FROM "RewardTier" t WHERE t."campaignId" = $1 ORDER BY t."position" ASC`, c.ID)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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c.Tiers = []AdminTier{}
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for rows.Next() {
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var t AdminTier
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var delivery *time.Time
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if err := rows.Scan(&t.ID, &t.Type, &t.Price, &t.ListPrice, &t.Title, &t.Includes,
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&t.InventoryLimit, &delivery, &t.Featured, &t.PledgeCount); err != nil {
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return nil, err
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}
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if delivery != nil {
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t.EstimatedDelivery = s.Day(*delivery)
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}
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c.Tiers = append(c.Tiers, t)
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}
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return &c, rows.Err()
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}
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// TierInput is one row of the tier editor. A row with an ID updates that tier,
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// a row without one creates it, and a tier missing from the slice entirely is
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// deleted — unless pledges reference it.
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type TierInput struct {
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ID string `json:"id"`
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Type string `json:"type"`
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Price int `json:"price"`
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ListPrice *int `json:"listPrice"`
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Title string `json:"title"`
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Includes []string `json:"includes"`
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InventoryLimit *int `json:"inventoryLimit"`
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EstimatedDelivery string `json:"estimatedDelivery"`
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Featured bool `json:"featured"`
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}
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type CampaignInput struct {
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ID string `json:"id"`
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Slug string `json:"slug"`
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Title string `json:"title"`
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Category string `json:"category"`
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Summary string `json:"summary"`
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Art string `json:"art"`
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GoalAmount int `json:"goalAmount"`
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EndsAt string `json:"endsAt"`
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Status string `json:"status"`
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OwnerID string `json:"ownerId"`
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Story []StorySection `json:"story"`
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Tiers []TierInput `json:"tiers"`
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}
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type SaveResult struct {
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Slug string `json:"slug"`
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// KeptInUseTier is true when a tier the caller wanted gone was retained
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// because pledges point at it. The save still succeeded.
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KeptInUseTier bool `json:"keptInUseTier"`
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}
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// SaveCampaign updates an existing campaign together with its story and tiers,
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// in one transaction, so a half-saved campaign cannot be observed.
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//
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// It cannot create one. Campaigns are set up by hand, directly in the database,
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// which is why an input without an id — or with one that matches no row — is
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// ErrNotFound rather than an insert.
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func (s *Store) SaveCampaign(ctx context.Context, in CampaignInput) (*SaveResult, error) {
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if in.ID == "" {
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return nil, ErrNotFound
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}
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endsAt, err := s.EndOfDay(in.EndsAt)
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if err != nil {
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return nil, err
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}
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tx, err := s.pool.Begin(ctx)
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if err != nil {
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return nil, err
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}
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defer tx.Rollback(ctx)
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campaignID := in.ID
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tag, err := tx.Exec(ctx, `
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UPDATE "Campaign" SET "slug"=$2, "title"=$3, "category"=$4, "summary"=$5,
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"art"=$6, "goalAmount"=$7, "endsAt"=$8, "status"=$9::"CampaignStatus",
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"ownerId"=$10, "updatedAt"=now()
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WHERE "id"=$1`,
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campaignID, in.Slug, in.Title, in.Category, in.Summary, in.Art,
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in.GoalAmount, endsAt, in.Status, in.OwnerID)
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if err != nil {
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if isUniqueViolation(err, "Campaign_slug_key") {
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return nil, ErrSlugTaken
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}
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return nil, err
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}
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// Without the insert branch an unknown id would otherwise update nothing and
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// then write story rows against a campaign that does not exist.
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if tag.RowsAffected() == 0 {
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return nil, ErrNotFound
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}
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// Story sections carry no foreign keys, so replacing them wholesale is safe.
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if _, err := tx.Exec(ctx,
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`DELETE FROM "StorySection" WHERE "campaignId" = $1`, campaignID); err != nil {
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return nil, err
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}
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for i, sec := range in.Story {
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if _, err := tx.Exec(ctx, `
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INSERT INTO "StorySection" ("id","campaignId","heading","body","position")
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VALUES ($1,$2,$3,$4,$5)`,
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NewID(), campaignID, sec.Heading, sec.Body, i); err != nil {
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return nil, err
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}
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}
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result := &SaveResult{Slug: in.Slug}
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// Which existing tiers survive this save, and which have pledges.
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type existing struct{ pledges int }
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current := map[string]existing{}
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rows, err := tx.Query(ctx, `
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SELECT t."id", (SELECT COUNT(*) FROM "Pledge" p WHERE p."tierId" = t."id")::int
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FROM "RewardTier" t WHERE t."campaignId" = $1`, campaignID)
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if err != nil {
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return nil, err
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}
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var order []string
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for rows.Next() {
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var id string
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var n int
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if err := rows.Scan(&id, &n); err != nil {
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rows.Close()
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return nil, err
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}
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current[id] = existing{pledges: n}
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order = append(order, id)
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}
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rows.Close()
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if err := rows.Err(); err != nil {
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return nil, err
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}
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kept := map[string]bool{}
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for _, t := range in.Tiers {
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if t.ID != "" {
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kept[t.ID] = true
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}
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}
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// Positions are unique per campaign, so park every existing row out of the
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// way before assigning final values — otherwise a reorder collides midway.
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for i, id := range order {
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if _, err := tx.Exec(ctx,
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`UPDATE "RewardTier" SET "position" = $2 WHERE "id" = $1`, id, -1-i); err != nil {
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return nil, err
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}
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}
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// A tier the caller dropped is deleted, unless pledges reference it: money
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// already promised against a reward outranks an edit to the reward list.
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final := append([]TierInput(nil), in.Tiers...)
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for _, id := range order {
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if kept[id] {
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continue
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}
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if current[id].pledges > 0 {
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result.KeptInUseTier = true
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t, err := s.tierByID(ctx, tx, id)
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if err != nil {
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return nil, err
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}
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final = append(final, *t)
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continue
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}
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if _, err := tx.Exec(ctx, `DELETE FROM "RewardTier" WHERE "id" = $1`, id); err != nil {
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return nil, err
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}
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}
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for i, t := range final {
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var delivery *time.Time
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if t.EstimatedDelivery != "" {
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d, err := s.EndOfDay(t.EstimatedDelivery)
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if err != nil {
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return nil, err
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}
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delivery = &d
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}
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if t.Includes == nil {
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t.Includes = []string{}
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}
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if t.ID != "" {
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_, err = tx.Exec(ctx, `
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UPDATE "RewardTier" SET "type"=$2::"TierType", "price"=$3, "listPrice"=$4,
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"title"=$5, "includes"=$6, "inventoryLimit"=$7,
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"estimatedDelivery"=$8, "featured"=$9, "position"=$10
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WHERE "id"=$1`,
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t.ID, t.Type, t.Price, t.ListPrice, t.Title, t.Includes,
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t.InventoryLimit, delivery, t.Featured, i)
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} else {
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_, err = tx.Exec(ctx, `
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INSERT INTO "RewardTier" ("id","campaignId","type","price","listPrice","title",
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"includes","inventoryLimit","estimatedDelivery",
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"featured","position")
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VALUES ($1,$2,$3::"TierType",$4,$5,$6,$7,$8,$9,$10,$11)`,
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NewID(), campaignID, t.Type, t.Price, t.ListPrice, t.Title, t.Includes,
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t.InventoryLimit, delivery, t.Featured, i)
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}
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if err != nil {
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return nil, err
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}
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}
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return result, tx.Commit(ctx)
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}
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func (s *Store) tierByID(ctx context.Context, tx pgx.Tx, id string) (*TierInput, error) {
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var t TierInput
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var delivery *time.Time
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err := tx.QueryRow(ctx, `
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SELECT "id", "type"::text, "price", "listPrice", "title", "includes",
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"inventoryLimit", "estimatedDelivery", "featured"
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FROM "RewardTier" WHERE "id" = $1`, id).Scan(
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&t.ID, &t.Type, &t.Price, &t.ListPrice, &t.Title, &t.Includes,
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&t.InventoryLimit, &delivery, &t.Featured)
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if err != nil {
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return nil, err
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}
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if delivery != nil {
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t.EstimatedDelivery = s.Day(*delivery)
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}
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return &t, nil
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}
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// DeleteCampaign refuses once any money has been promised: the pledge rows are
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// the record of who gave what, and losing them to a mis-click is unacceptable.
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func (s *Store) DeleteCampaign(ctx context.Context, id string) error {
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var pledges int
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if err := s.pool.QueryRow(ctx,
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`SELECT COUNT(*)::int FROM "Pledge" WHERE "campaignId" = $1`, id).Scan(&pledges); err != nil {
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return err
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}
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if pledges > 0 {
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return ErrHasPledges
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}
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tag, err := s.pool.Exec(ctx, `DELETE FROM "Campaign" WHERE "id" = $1`, id)
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if err != nil {
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return err
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}
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if tag.RowsAffected() == 0 {
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return ErrNotFound
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}
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return nil
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}
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func (s *Store) CampaignSlugByID(ctx context.Context, id string) (string, error) {
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var slug string
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err := s.pool.QueryRow(ctx, `SELECT "slug" FROM "Campaign" WHERE "id" = $1`, id).Scan(&slug)
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if errors.Is(err, pgx.ErrNoRows) {
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return "", ErrNotFound
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}
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return slug, err
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}
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func isUniqueViolation(err error, constraint string) bool {
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var pgErr *pgconn.PgError
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return errors.As(err, &pgErr) && pgErr.Code == "23505" &&
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(constraint == "" || pgErr.ConstraintName == constraint)
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}
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