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Fix billboard example contract #49

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Merged
lgalabru merged 3 commits into from
Jun 21, 2021
Merged

Fix billboard example contract #49

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b7c64c8
fix: add assert! and variable
reedrosenbluth Jun 17, 2021
d4c751e
fix: errors and add comments
reedrosenbluth Jun 17, 2021
fc14354
fix: remove asserts, errors
reedrosenbluth Jun 17, 2021
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fix: add assert! and variable
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@reedrosenbluth
reedrosenbluth committed Jun 17, 2021
commit b7c64c89eee2e4254018fd8622b8ee042e63930b
11 changes: 8 additions & 3 deletions examples/billboard/contracts/billboard.clar
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
;; error consts
(define-constant ERR_INVALID_STRING u0)
(define-constant ERR_STX_TRANSFER u1)
(define-constant ERR_SET_MESSAGE u2)

;; data maps/vars
(define-data-var billboard-message (string-utf8 500) u"Hello World!")
Expand All @@ -18,9 +19,13 @@
)

(define-public (set-message (message (string-utf8 500)))
(let ((cur-price (var-get price)))
(let ((cur-price (var-get price))
(new-price (+ u10 cur-price)))

(unwrap! (stx-transfer? cur-price tx-sender (as-contract tx-sender)) (err ERR_STX_TRANSFER))
(var-set price (+ cur-price u10))
(asserts! (var-set billboard-message message) (err ERR_INVALID_STRING))
(asserts! (var-set price new-price) (err ERR_SET_MESSAGE))
(asserts! (var-set billboard-message message) (err ERR_SET_MESSAGE))

(ok new-price)
)
)