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| <xml xmlns="https://developers.google.com/blockly/xml"><block type="BaseContractType" id="root_contract" deletable="false" x="13" y="187"><statement name="BaseContractType"><block type="WhenContractType" id="2/:WL!kni#xVO[JD@vYM"><field name="timeout">10</field><statement name="case"><block type="DepositActionType" id="}ED~T~;u.8sa]%?l|yz5"><value name="from_party"><block type="RolePartyType" id="tZ(F#.1`y)u6qjWdD@$O"><field name="role">alice</field></block></value><value name="value"><block type="ConstantValueType" id="9I1oM~84DSlVN5owEMYV"><field name="constant">450</field></block></value><value name="token"><block type="AdaTokenType" id="%oBM{`+9SDMAUPWW7$Gj"/></value><value name="party"><block type="RolePartyType" id=":s+2]]MoEKdl)vd?-DfX"><field name="role">alice</field></block></value><statement name="contract"><block type="WhenContractType" id="FPtb*=MyYhiV=xF[m9F|"><field name="timeout">40</field><statement name="case"><block type="ChoiceActionType" id="D^*~|m+)t)-!E;?ERyz,"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="[`,CRkz*|n6j_lWV1YYj"><field name="role">alice</field></block></value><statement name="bounds"><block type="BoundsType" id="jk6llN(7,lQ0QxjgLND0"><field name="from">0</field><field name="to">1</field></block></statement><statement name="contract"><block type="WhenContractType" id="_2hydu6k*V4f/KPvvtxZ"><field name="timeout">60</field><statement name="case"><block type="ChoiceActionType" id="/Ye-y3e;oljX.i(r+NfD"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="%9|ETLmwO3gAbfP)2op?"><field name="role">bob</field></block></value><statement name="bounds"><block type="BoundsType" id="JVMUmWmV$5NM}$|lg+}/"><field name="from">0</field><field name="to">1</field></block></statement><statement name="contract"><block type="IfContractType" id="Hpx5~n/CWP*ynyE_Sxj]"><value name="observation"><block type="ValueEQObservationType" id=";?mV/3xG;Uy|RlbgF|!2"><value name="value1"><block type="ChoiceValueValueType" id="dj#g;UI_LS|.rX,m$;H9"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id=")y+qkwYuRL)PY8Fct}V0"><field name="role">alice</field></block></value></block></value><value name="value2"><block type="ChoiceValueValueType" id="8@G2^tE23PM8fe/|}vfx"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="$)hCjOQB{Ge3Ym/Es$(K"><field name="role">bob</field></block></value></block></value></block></value><statement name="contract1"><block type="IfContractType" id="t+Q0|QZ4aM|0hRR6o}Ww"><value name="observation"><block type="ValueEQObservationType" id="52tKS2da9~2]@Dv,XhWv"><value name="value1"><block type="ChoiceValueValueType" id="vtf.xtN1uaGt{9@Rb2UB"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="4*C9E6(}:$X*f^:..t,s"><field name="role">alice</field></block></value></block></value><value name="value2"><block type="ConstantValueType" id="{MZSaLWss=hDFz@a`qo["><field name="constant">0</field></block></value></block></value><statement name="contract1"><block type="PayContractType" id="p+74K8N|2~Riv1Iz3Nv)"><value name="payee"><block type="PartyPayeeType" id="9akz)Hq_Fg#3!#h$uF2w"><value name="party"><block type="RolePartyType" id="Viif:n~{kdyw8Y+]p~1U"><field name="role">bob</field></block></value></block></value><value name="value"><block type="ConstantValueType" id="m^wh?=8lBATzpKAb`SWQ"><field name="constant">450</field></block></value><value name="token"><block type="AdaTokenType" id="9-)55Z77QnoT,!Z~1rCk"/></value><value name="party"><block type="RolePartyType" id="8d_KE/@|v)Yub?2}GY,*"><field name="role">alice</field></block></value><statement name="contract"><block type="CloseContractType" id="lf:/t!XQ`xx?8`BL3AU_"/></statement></block></statement><statement name="contract2"><block type="CloseContractType" id="]@ewhi,jXMCJt^IZ65Vc"/></statement></block></statement><statement name="contract2"><block type="WhenContractType" id="z!6?pF:wpIAa:XNEXQ$@"><field name="timeout">100</field><statement name="case"><block type="ChoiceActionType" id="gg25^w#R7bV3d$T$MiO0"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="GA;_-[.cW5-xN(A}bLz7"><field name="role">carol</field></block></value><statement name="bounds"><block type="BoundsType" id="BIB$Oa}{@)kj3I(N2I;1"><field name="from">1</field><field name="to">1</field></block></statement><statement name="contract"><block type="CloseContractType" id="a[Rd[LnOZ}zX3/)b!l[T"/></statement><next><block type="ChoiceActionType" id="cjpx14|n1-_zW#QE+V,q"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="Y25kN-}T;{o2iG?L-g5e"><field name="role">carol</field></block></value><statement name="bounds"><block type="BoundsType" id="T8=PR9{4V=@x4Z+.#;HT"><field 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id="^~q-Z7N*xtG^;sxZvk$7"/></statement></block></statement></block></statement></block></statement><statement name="contract"><block type="WhenContractType" id="WGf#Pa79.cFhmFDlL5UM"><field name="timeout">100</field><statement name="case"><block type="ChoiceActionType" id="Sbq@)!Ugl*+D703n*w=r"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="QSVTJZw/_3TjyMZZ?H!H"><field name="role">carol</field></block></value><statement name="bounds"><block type="BoundsType" id="|]O8K~grs+I8vX4H-ckA"><field name="from">1</field><field name="to">1</field></block></statement><statement name="contract"><block type="CloseContractType" id="KllO,ru{MmQ(M.@m]jvt"/></statement><next><block type="ChoiceActionType" id="[_uyMPY1;)2nL=@[9wtS"><field name="choice_name">choice</field><value name="party"><block type="RolePartyType" id="V+h}%5dE^~H=8zK;U%S~"><field name="role">carol</field></block></value><statement name="bounds"><block type="BoundsType" id="?wg}z$7*YM;i#4NgY:^?"><field name="from">0</field><field name="to">0</field></block></statement><statement name="contract"><block type="PayContractType" id="Ag8488py$gC=c!D7Ohvz"><value name="payee"><block type="PartyPayeeType" id="%#s~]-/wJg#/?uGZ{4||"><value name="party"><block type="RolePartyType" id="U.Ik|@BFSWQIJ+PwQiRP"><field name="role">bob</field></block></value></block></value><value name="value"><block type="ConstantValueType" id="TV:6]||apZ4}KbWA!2R+"><field name="constant">450</field></block></value><value name="token"><block type="AdaTokenType" id="Ikc0H*Ai3ZJa%+Q6awB@"/></value><value name="party"><block type="RolePartyType" id="f.(4RD]j-T7fL*`#~90{"><field name="role">alice</field></block></value><statement name="contract"><block type="CloseContractType" id="8UC^8OPKt@gP+wACiav="/></statement></block></statement></block></next></block></statement><statement name="contract"><block type="CloseContractType" id="$j=Jz*/=.X_a;0vGc(S2"/></statement></block></statement></block></statement></block></statement><statement name="contract"><block type="CloseContractType" id="+!|C!994KqRmh3+,.Z3e"/></statement></block></statement></block></xml> |
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| {-# LANGUAGE OverloadedStrings #-} | |
| module Escrow where | |
| import Language.Marlowe | |
| main :: IO () | |
| main = print . pretty $ contract | |
| {- What does the vanilla contract look like? | |
| - if Alice and Bob choose | |
| - and agree: do it | |
| - and disagree: Carol decides | |
| - Carol also decides if timeout after one choice has been made; | |
| - refund if no choices are made. | |
| -} | |
| contract :: Contract | |
| contract = When [Case (Deposit "alice" "alice" ada price) inner] | |
| 10 | |
| Close | |
| inner :: Contract | |
| inner = | |
| When [ Case aliceChoice | |
| (When [ Case bobChoice | |
| (If (aliceChosen `ValueEQ` bobChosen) | |
| agreement | |
| arbitrate) ] | |
| 60 | |
| arbitrate) | |
| ] | |
| 40 | |
| arbitrate | |
| -- The contract to follow when Alice and Bob have made the same choice. | |
| agreement :: Contract | |
| agreement = | |
| If | |
| (aliceChosen `ValueEQ` Constant 0) | |
| (Pay "alice" (Party "bob") ada price Close) | |
| Close | |
| -- The contract to follow when Alice and Bob disagree, or if | |
| -- Carol has to intervene after a single choice from Alice or Bob. | |
| arbitrate :: Contract | |
| arbitrate = | |
| When [ Case carolRefund Close, | |
| Case carolPay (Pay "alice" (Party "bob") ada price Close) ] | |
| 100 | |
| Close | |
| -- Names for choices | |
| pay,refund,both :: [Bound] | |
| pay = [Bound 0 0] | |
| refund = [Bound 1 1] | |
| both = [Bound 0 1] | |
| -- helper function to build Actions | |
| choiceName :: ChoiceName | |
| choiceName = "choice" | |
| choice :: Party -> [Bound] -> Action | |
| choice party = Choice (ChoiceId choiceName party) | |
| -- Name choices according to person making choice and choice made | |
| alicePay, aliceRefund, aliceChoice, bobPay, bobRefund, bobChoice, carolPay, carolRefund, carolChoice :: Action | |
| alicePay = choice "alice" pay | |
| aliceRefund = choice "alice" refund | |
| aliceChoice = choice "alice" both | |
| bobPay = choice "bob" pay | |
| bobRefund = choice "bob" refund | |
| bobChoice = choice "bob" both | |
| carolPay = choice "carol" pay | |
| carolRefund = choice "carol" refund | |
| carolChoice = choice "carol" both | |
| -- the values chosen in choices | |
| aliceChosen, bobChosen :: (Value Observation) | |
| aliceChosen = ChoiceValue (ChoiceId choiceName "alice") | |
| bobChosen = ChoiceValue (ChoiceId choiceName "bob") | |
| defValue :: (Value Observation) | |
| defValue = Constant 42 | |
| -- Value under escrow | |
| price :: (Value Observation) | |
| price = Constant 450 |
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| /* Parties */ | |
| const alice : Party = Role("alice"); | |
| const bob : Party = Role("bob"); | |
| const carol : Party = Role("carol"); | |
| /* Value under escrow */ | |
| const price : SomeNumber = 450n; | |
| /* helper function to build Actions */ | |
| const choiceName : string = "choice"; | |
| const choiceIdBy = function (party : Party) : ChoiceId { | |
| return ChoiceId(choiceName, party); | |
| } | |
| const choiceBy = function(party : Party, bounds : [Bound]) : Action { | |
| return Choice(choiceIdBy(party), bounds); | |
| }; | |
| const choiceValueBy = function(party : Party) : Value { | |
| return ChoiceValue(choiceIdBy(party)); | |
| }; | |
| /* Names for choices */ | |
| const pay : [Bound] = [Bound(0n, 0n)]; | |
| const refund : [Bound] = [Bound(1n, 1n)]; | |
| const both : [Bound] = [Bound(0n, 1n)]; | |
| /* Name choices according to person making choice and choice made */ | |
| const alicePay : Action = choiceBy(alice, pay); | |
| const aliceRefund : Action = choiceBy(alice, refund); | |
| const aliceChoice : Action = choiceBy(alice, both); | |
| const bobPay : Action = choiceBy(bob, pay); | |
| const bobRefund : Action = choiceBy(bob, refund); | |
| const bobChoice : Action = choiceBy(bob, both); | |
| const carolPay : Action = choiceBy(carol, pay); | |
| const carolRefund : Action = choiceBy(carol, refund); | |
| const carolChoice : Action = choiceBy(carol, both); | |
| /* the values chosen in choices */ | |
| const aliceChosen : Value = choiceValueBy(alice); | |
| const bobChosen : Value = choiceValueBy(bob); | |
| /* The contract to follow when Alice and Bob disagree, or if | |
| Carol has to intervene after a single choice from Alice or Bob. */ | |
| const arbitrate : Contract = When([Case(carolRefund, Close), | |
| Case(carolPay, Pay(alice, Party(bob), ada, price, Close))], | |
| 100n, Close); | |
| /* The contract to follow when Alice and Bob have made the same choice. */ | |
| const agreement : Contract = If(ValueEQ(aliceChosen, 0n), | |
| Pay(alice, Party(bob), ada, price, Close), | |
| Close); | |
| /* Inner part of contract */ | |
| const inner : Contract = When([Case(aliceChoice, | |
| When([Case(bobChoice, | |
| If(ValueEQ(aliceChosen, bobChosen), | |
| agreement, | |
| arbitrate))], | |
| 60n, arbitrate))], | |
| 40n, Close); | |
| /* What does the vanilla contract look like? | |
| - if Alice and Bob choose | |
| - and agree: do it | |
| - and disagree: Carol decides | |
| - Carol also decides if timeout after one choice has been made; | |
| - refund if no choices are made. */ | |
| const contract : Contract = When([Case(Deposit(alice, alice, ada, price), inner)], | |
| 10n, | |
| Close) | |
| return contract; |
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| When | |
| [Case | |
| (Deposit | |
| (Role "alice") | |
| (Role "alice") | |
| (Token "" "") | |
| (Constant 450) | |
| ) | |
| (When | |
| [Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "alice") | |
| ) | |
| [Bound 0 1] | |
| ) | |
| (When | |
| [Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "bob") | |
| ) | |
| [Bound 0 1] | |
| ) | |
| (If | |
| (ValueEQ | |
| (ChoiceValue | |
| (ChoiceId | |
| "choice" | |
| (Role "alice") | |
| )) | |
| (ChoiceValue | |
| (ChoiceId | |
| "choice" | |
| (Role "bob") | |
| )) | |
| ) | |
| (If | |
| (ValueEQ | |
| (ChoiceValue | |
| (ChoiceId | |
| "choice" | |
| (Role "alice") | |
| )) | |
| (Constant 0) | |
| ) | |
| (Pay | |
| (Role "alice") | |
| (Party (Role "bob")) | |
| (Token "" "") | |
| (Constant 450) | |
| Close | |
| ) | |
| Close | |
| ) | |
| (When | |
| [Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "carol") | |
| ) | |
| [Bound 1 1] | |
| ) | |
| Close , Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "carol") | |
| ) | |
| [Bound 0 0] | |
| ) | |
| (Pay | |
| (Role "alice") | |
| (Party (Role "bob")) | |
| (Token "" "") | |
| (Constant 450) | |
| Close | |
| )] | |
| 100 Close | |
| ) | |
| )] | |
| 60 | |
| (When | |
| [Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "carol") | |
| ) | |
| [Bound 1 1] | |
| ) | |
| Close , Case | |
| (Choice | |
| (ChoiceId | |
| "choice" | |
| (Role "carol") | |
| ) | |
| [Bound 0 0] | |
| ) | |
| (Pay | |
| (Role "alice") | |
| (Party (Role "bob")) | |
| (Token "" "") | |
| (Constant 450) | |
| Close | |
| )] | |
| 100 Close | |
| ) | |
| )] | |
| 40 Close | |
| )] | |
| 10 Close |
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| {} |
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