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Version: 0.3

Adding a schema

We have added our first member to the governance, but there's still more to complete, as we haven't defined the data structure for tracking Wine type subjects in this use case.

To progress in the tutorial, we need to define a data structure where we can store information for each wine bottle. In Taple, this definition is done using schemas, which allow us to specify the fields, data types, and relationships we want to store, such as harvest number, type of grape, origin of the grape, organic certification, etc.

Schema​

Before proceeding, it's essential to have a clear idea of the information we want to store for each wine bottle. Then, we'll proceed to create the schema that represents that information appropriately. Below is the schema we have created:

  • Harvest number
  • Type of grape
  • Origin of the grape
  • Certificate authenticating whether it is organic or not
  • Values to be changed in the temperature control event:
    • Timestamp of the last check
    • Value that confirms whether the wine cold chain has been complied with

The schema must be defined in json-schema format so that Taple can interpret it correctly. Here's the schema in this format:

{
    "id": "Wine",
    "description": "Representation of a bottle of wine",
    "type": "object",
    "properties": {
        "harvest": {
            "description": "Harvest number",
            "type": "integer"
        },
        "grape": {
            "description": "Type of grape",
            "type": ["string", "null"],
            "enum": ["CabernetSauvignon", "Chardonnay", "PinotNoir", null]
        },
        "origin": {
            "description": "Origin of the grape",
            "type": "string"
        },
        "organic_certified": {
            "description": "Certificate authenticating whether it is organic or not",
            "type": ["boolean", "null"]
        },
        "temperature_control": {
            "description": "Values to be changed in the temperature control event",
            "type": "object",
            "properties": {
                "last_check": {
                    "description": "Timestamp of last check",
                    "type": "number"
                },
                "temperature_ok": {
                    "description": "Value that corroborates whether the wine cold chain has been complied with",
                    "type": "boolean"
                }
            },
            "required": [ "last_check", "temperature_ok" ],
            "additionalProperties": false
        }
    },
    "required": [ "harvest", "grape", "origin", "organic_certified", "temperature_control" ],
    "additionalProperties": false
}

Smart Contract​

After declaring our schema, the next step is to create the smart contract as we need a way to update the states of the subjects we declare. Therefore, we'll create a small project for the contract development, taking reference from what has been declared in this section.

  1. Execute the following command:

    Another terminal
    cargo new wine-contract

    This will create an empty Rust project with the specified name, resulting in the following structure:

    .
    ├── Cargo.toml
    └── src
        └── main.rs

  2. We need to modify the Cargo.toml file to include the Taple contracts SDK as well as the serde module, which will handle data serialization and deserialization:

    [package]
    name = "wine-contract"
    version = "0.1.0"
    edition = "2021"

    [dependencies]
    serde = { version = "1.0.152", features = ["derive"] }
    taple-sc-rust = { git = "https://github.com/opencanarias/taple-sc-rust.git", branch = "main"}
    info

    From now on, all the remaining numbered steps will be performed within the main.rs file.

  3. Add the necessary dependencies at the beginning of our file:

    use taple_sc_rust as sdk;
    use serde::{Deserialize, Serialize};

  4. Next, we'll add the data structures that will represent our Wine subjects:

    #[derive(Serialize, Deserialize, Clone, PartialEq)] 
    enum Grape {
        CabernetSauvignon,
        Chardonnay,
        PinotNoir,
    }

    #[derive(Serialize, Deserialize, Clone)]
    struct TemperatureControl {
        pub last_check: u32,
        pub temperature_ok: bool,
    }

    #[derive(Serialize, Deserialize, Clone)]
    struct State {
        pub harvest: u32,
        pub grape: Option<Grape>,
        pub origin: String,
        pub organic_certified: Option<bool>,
        pub temperature_control: TemperatureControl,
    }

  5. Now is the time to define the state events that can be triggered on our Wine type subjects, which are:

    • Init: Responsible for initializing only those subjects coming from a genesis state.
    • TemperatureControl: In charge of performing the temperature check.
    • OrganicCertification: Responsible for modifying the state of organic certification.

    The added code will be:

    #[derive(Serialize, Deserialize)]
    enum StateEvent {
        Init {
            harvest: u32,
            grape: String,
            origin: String,
        },
        TemperatureControl {
            temperature: f32,
            timestamp: u32,
        },
        OrganicCertification {
            fertilizers_control: bool,
            pesticides_control: bool,
            analytics: bool,
            additional_info: String,
        },
    }

  6. Add the entry function for the contract, equivalent to the main function:

    #[no_mangle]
    pub unsafe fn main_function(state_ptr: i32, event_ptr: i32, is_owner: i32) -> u32 {
        sdk::execute_contract(state_ptr, event_ptr, is_owner, contract_logic)
    }
    WARNING

    It's important for this function to always have the same name specified here since it's the identifier with which the evaluator will try to execute it, and it will result in an error if not found.

  7. Lastly, add the business logic that will act in each of the cases for the state events declared above:

    const TEMPERATURE_RANGE: (f32, f32) = (10.0, 16.0);

    fn contract_logic(
        context: &sdk::Context<State, StateEvent>,
        contract_result: &mut sdk::ContractResult<State>,
    ) {
        let state = &mut contract_result.final_state;
        match &context.event {
            StateEvent::Init {
                harvest,
                grape,
                origin,
            } => {
                if context.is_owner && !check_subject_has_been_initiated(state) {
                    let grape = match grape.as_str() {
                        "CabernetSauvignon" => Some(Grape::CabernetSauvignon),
                        "Chardonnay" => Some(Grape::Chardonnay),
                        "PinotNoir" => Some(Grape::PinotNoir),
                        _ => None,
                    };
                    if grape.is_some() {
                        state.harvest = *harvest;
                        state.grape = grape;
                        state.origin = origin.to_string();
                        contract_result.success = true;
                    }
                }
            }
            StateEvent::TemperatureControl {
                temperature,
                timestamp,
            } => {
                if context.is_owner && check_subject_has_been_initiated(state) {
                    if check_temperature_in_range(*temperature)
                        && state.temperature_control.temperature_ok
                    {
                        state.temperature_control.last_check = *timestamp;
                    } else {
                        state.temperature_control.temperature_ok = false;
                        state.temperature_control.last_check = *timestamp;
                    }
                    contract_result.success = true;
                }
            }
            StateEvent::OrganicCertification {
                fertilizers_control,
                pesticides_control,
                analytics,
                additional_info,
            } => {
                if check_subject_has_been_initiated(state) {
                    match state.organic_certified {
                        Some(organic_cerified) => {
                            if organic_cerified
                                && !check_is_organic(
                                    *fertilizers_control,
                                    *pesticides_control,
                                    *analytics,
                                )
                            {
                                state.organic_certified = Some(false);
                            }
                        }
                        None => {
                            if check_is_organic(*fertilizers_control, *pesticides_control, *analytics) {
                                state.organic_certified = Some(true);
                            } else {
                                state.organic_certified = Some(false);
                            }
                        }
                    }
                    contract_result.success = true;
                }
            }
        }
    }

    fn check_subject_has_been_initiated(state: &State) -> bool {
        let initial_grape = match state.grape {
            Some(_) => false,
            None => true,
        };
        if state.harvest == 0 && initial_grape && state.origin == format!("") {
            return false;
        }
        return true;
    }

    fn check_temperature_in_range(temperature: f32) -> bool {
        if temperature >= TEMPERATURE_RANGE.0 && temperature <= TEMPERATURE_RANGE.1 {
            return true;
        }
        return false;
    }

    fn check_is_organic(fertilizers_control: bool, pesticides_control: bool, analytics: bool) -> bool {
        if fertilizers_control && pesticides_control && analytics {
            return true;
        }
        return false;
    }
    caution

    It's essential to include contract_result.success = true in those points of the contract_logic function where we believe the execution has been successful. Otherwise, when emitting the events, they will always end with "success" = false state.

Taple only supports contracts in Base64, so we'll need to transform ours into that format. For this purpose, Linux has its own utility called base64. Therefore, what we need to do in our main.rs file is:

Another terminal
base64 main.rs

The returned result will be the contract encoded in base64.

Back to Taple network​

Once we have declared both, the schema and the smart contract, it's necessary to emit a fact event to the governance to add this new information.

Let's start by verifying the changes we want to make in the governance properties. At this point, our governance should look like the following:

{
    "policies": [
        {
            "approve": {
                "quorum": "MAJORITY"
            },
            "evaluate": {
                "quorum": "MAJORITY"
            },
            "id": "governance",
            "validate": {
                "quorum": "MAJORITY"
            }
        }
    ],
    "schemas": []
}

Now, we need to include the schema, the smart contract, the genesis state of a subject, as well as the policies that will be applied to them:

{
    "policies": [

        ...

        {
            "approve": {
                "quorum": "MAJORITY"
            },
            "evaluate": {
                "quorum": "MAJORITY"
            },
            "id": "Wine",
            "validate": {
                "quorum": "MAJORITY"
            }
        }
    ],
    "schemas": [
        {
            "contract": {
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                        "
            },
            "id": "Wine",
            "initial_value": {
                "grape": null,
                "harvest": 0,
                "organic_certified": null,
                "origin": "",
                "temperature_control": {
                    "last_check": 0,
                    "temperature_ok": true
                }
            },
            "schema": {
                "additionalProperties": false,
                "description": "Representation of a bottle of wine",
                "properties": {
                    "grape": {
                        "description": "Type of grape",
                        "enum": [
                            "CabernetSauvignon",
                            "Chardonnay",
                            "PinotNoir",
                            null
                        ],
                        "type": [
                            "string",
                            "null"
                        ]
                    },
                    "harvest": {
                        "description": "Harvest number",
                        "type": "integer"
                    },
                    "organic_certified": {
                        "description": "Certificate authenticating whether it is organic or not",
                        "type": [
                            "boolean",
                            "null"
                        ]
                    },
                    "origin": {
                        "description": "Origin of the grape",
                        "type": "string"
                    },
                    "temperature_control": {
                        "additionalProperties": false,
                        "description": "Values to be changed in the temperature control event",
                        "properties": {
                            "last_check": {
                                "description": "Timestamp of last check",
                                "type": "integer"
                            },
                            "temperature_ok": {
                                "description": "Value that corroborates whether the wine cold chain has been complied with",
                                "type": "boolean"
                            }
                        },
                        "required": [
                            "last_check",
                            "temperature_ok"
                        ],
                        "type": "object"
                    }
                },
                "required": [
                    "harvest",
                    "grape",
                    "origin",
                    "organic_certified",
                    "temperature_control"
                ],
                "type": "object"
            }
        }
    ]
}

To generate the mentioned changes, we will use our TAPLE-Patch tool as follows:

Another terminal
taple-patch '{"policies":[{"approve":{"quorum":"MAJORITY"},"evaluate":{"quorum":"MAJORITY"},"id":"governance","validate":{"quorum":"MAJORITY"}}],"schemas":[]}' '{"policies":[{"approve":{"quorum":"MAJORITY"},"evaluate":{"quorum":"MAJORITY"},"id":"governance","validate":{"quorum":"MAJORITY"}},{"approve":{"quorum":"MAJORITY"},"evaluate":{"quorum":"MAJORITY"},"id":"Wine","validate":{"quorum":"MAJORITY"}}],"schemas":[{"contract":{"raw":"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"},"id":"Wine","initial_value":{"grape":null,"harvest":0,"organic_certified":null,"origin":"","temperature_control":{"last_check":0,"temperature_ok":true}},"schema":{"additionalProperties":false,"description":"Representationofabottleofwine","properties":{"grape":{"description":"Typeofgrape","enum":["CabernetSauvignon","Chardonnay","PinotNoir",null],"type":["string","null"]},"harvest":{"description":"Harvestnumber","type":"integer"},"organic_certified":{"description":"Certificateauthenticatingwhetheritisorganicornot","type":["boolean","null"]},"origin":{"description":"Originofthegrape","type":"string"},"temperature_control":{"additionalProperties":false,"description":"Valuestobechangedinthetemperaturecontrolevent","properties":{"last_check":{"description":"Timestampoflastcheck","type":"integer"},"temperature_ok":{"description":"Valuethatcorroborateswhetherthewinecoldchainhasbeencompliedwith","type":"boolean"}},"required":["last_check","temperature_ok"],"type":"object"}},"required":["harvest","grape","origin","organic_certified","temperature_control"],"type":"object"}}]}'

The result obtained will be as follows:

[
    {
        "op": "add",
        "path": "/policies/1",
        "value": {
            "approve": {
                "quorum": "MAJORITY"
            },
            "evaluate": {
                "quorum": "MAJORITY"
            },
            "id": "Wine",
            "validate": {
                "quorum": "MAJORITY"
            }
        }
    },
    {
        "op": "add",
        "path": "/schemas/0",
        "value": {
            "contract": {
                "raw": "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"
            },
            "id": "Wine",
            "initial_value": {
                "grape": null,
                "harvest": 0,
                "organic_certified": null,
                "origin": "",
                "temperature_control": {
                    "last_check": 0,
                    "temperature_ok": true
                }
            },
            "schema": {
                "additionalProperties": false,
                "description": "Representationofabottleofwine",
                "properties": {
                    "grape": {
                        "description": "Typeofgrape",
                        "enum": [
                            "CabernetSauvignon",
                            "Chardonnay",
                            "PinotNoir",
                            null
                        ],
                        "type": [
                            "string",
                            "null"
                        ]
                    },
                    "harvest": {
                        "description": "Harvestnumber",
                        "type": "integer"
                    },
                    "organic_certified": {
                        "description": "Certificateauthenticatingwhetheritisorganicornot",
                        "type": [
                            "boolean",
                            "null"
                        ]
                    },
                    "origin": {
                        "description": "Originofthegrape",
                        "type": "string"
                    },
                    "temperature_control": {
                        "additionalProperties": false,
                        "description": "Valuestobechangedinthetemperaturecontrolevent",
                        "properties": {
                            "last_check": {
                                "description": "Timestampoflastcheck",
                                "type": "integer"
                            },
                            "temperature_ok": {
                                "description": "Valuethatcorroborateswhetherthewinecoldchainhasbeencompliedwith",
                                "type": "boolean"
                            }
                        },
                        "required": [
                            "last_check",
                            "temperature_ok"
                        ],
                        "type": "object"
                    }
                },
                "required": [
                    "harvest",
                    "grape",
                    "origin",
                    "organic_certified",
                    "temperature_control"
                ],
                "type": "object"
            }
        }
    }
]

Now, it's time to call the method of the governance contract responsible for updating its properties. To do this, we will execute the following:

Node: WPO
curl --request POST 'http://localhost:3000/api/event-requests' \
--header 'Content-Type: application/json' \
--data-raw '{
    "request": {
        "Fact": {
            "subject_id": {{GOVERNANCE-ID}},
            "payload": {
                "Patch": {
                    "data": [
                        {
                            "op": "add",
                            "path": "/policies/1",
                            "value": {
                                "approve": {
                                    "quorum": "MAJORITY"
                                },
                                "evaluate": {
                                    "quorum": "MAJORITY"
                                },
                                "id": "Wine",
                                "validate": {
                                    "quorum": "MAJORITY"
                                }
                            }
                        },
                        {
                            "op": "add",
                            "path": "/schemas/0",
                            "value": {
                                "contract": {
                                    "raw": "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"
                                },
                                "id": "Wine",
                                "initial_value": {
                                    "grape": null,
                                    "harvest": 0,
                                    "organic_certified": null,
                                    "origin": "",
                                    "temperature_control": {
                                        "last_check": 0,
                                        "temperature_ok": true
                                    }
                                },
                                "schema": {
                                    "additionalProperties": false,
                                    "description": "Representationofabottleofwine",
                                    "properties": {
                                        "grape": {
                                            "description": "Typeofgrape",
                                            "enum": [
                                                "CabernetSauvignon",
                                                "Chardonnay",
                                                "PinotNoir",
                                                null
                                            ],
                                            "type": [
                                                "string",
                                                "null"
                                            ]
                                        },
                                        "harvest": {
                                            "description": "Harvestnumber",
                                            "type": "integer"
                                        },
                                        "organic_certified": {
                                            "description": "Certificateauthenticatingwhetheritisorganicornot",
                                            "type": [
                                                "boolean",
                                                "null"
                                            ]
                                        },
                                        "origin": {
                                            "description": "Originofthegrape",
                                            "type": "string"
                                        },
                                        "temperature_control": {
                                            "additionalProperties": false,
                                            "description": "Valuestobechangedinthetemperaturecontrolevent",
                                            "properties": {
                                                "last_check": {
                                                    "description": "Timestampoflastcheck",
                                                    "type": "integer"
                                                },
                                                "temperature_ok": {
                                                    "description": "Valuethatcorroborateswhetherthewinecoldchainhasbeencompliedwith",
                                                    "type": "boolean"
                                                }
                                            },
                                            "required": [
                                                "last_check",
                                                "temperature_ok"
                                            ],
                                            "type": "object"
                                        }
                                    },
                                    "required": [
                                        "harvest",
                                        "grape",
                                        "origin",
                                        "organic_certified",
                                        "temperature_control"
                                    ],
                                    "type": "object"
                                }
                            }
                        }
                    ]
                }
            }
        }
    }
}'

Once the event is emitted, we need to obtain the new update request. To do this, we run the following:

Node: WPO
curl --request GET 'http://localhost:3000/api/approval-requests?status=Pending'

We copy the value of the id field and accept the governance update request:

Node: WPO
curl --request PATCH 'http://localhost:3000/api/approval-requests/{{PREVIUS-ID}}' \
--header 'Content-Type: application/json' \
--data-raw '{"state": "RespondedAccepted"}'

Finally, we query the governance to verify that the change has been successfully applied. If everything has gone according to plan, it should now have an sn of 2, and the new policy, schema, initial state for Wine subjects, and the smart contract should be present:

Node: WPO
curl --request GET 'http://localhost:3000/api/subjects/{{GOVERNANCE-ID}}'
Click to look at the full governance.
{
    "subject_id": {{GOVERNANCE-ID}},
    "governance_id": "",
    "sn": 2,
    "public_key": "E8tVWEasubIp7P9fzk_HttNCsABymV9m9xEPAfr-QV7M",
    "namespace": "",
    "name": "wine_track",
    "schema_id": "governance",
    "owner": "EbwR0yYrCYpTzlN5i5GX_MtAbKRw5y2euv3TqiTgwggs",
    "creator": "EbwR0yYrCYpTzlN5i5GX_MtAbKRw5y2euv3TqiTgwggs",
    "properties": {
        "members": [
        {
            "id": "EbwR0yYrCYpTzlN5i5GX_MtAbKRw5y2euv3TqiTgwggs",
            "name": "WPO"
        }
        ],
        "policies": [
        {
            "approve": {
            "quorum": "MAJORITY"
            },
            "evaluate": {
            "quorum": "MAJORITY"
            },
            "id": "governance",
            "validate": {
            "quorum": "MAJORITY"
            }
        },
        {
            "approve": {
            "quorum": "MAJORITY"
            },
            "evaluate": {
            "quorum": "MAJORITY"
            },
            "id": "Wine",
            "validate": {
            "quorum": "MAJORITY"
            }
        }
        ],
        "roles": [
        {
            "namespace": "",
            "role": "WITNESS",
            "schema": {
            "ID": "governance"
            },
            "who": "MEMBERS"
        },
        {
            "namespace": "",
            "role": "APPROVER",
            "schema": {
            "ID": "governance"
            },
            "who": {
            "NAME": "WPO"
            }
        }
        ],
        "schemas": [
        {
            "contract": {
            "raw": "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            },
            "id": "Wine",
            "initial_value": {
            "grape": null,
            "harvest": 0,
            "organic_certified": null,
            "origin": "",
            "temperature_control": {
                "last_check": 0,
                "temperature_ok": true
            }
            },
            "schema": {
            "additionalProperties": false,
            "description": "Representation of a bottle of wine",
            "properties": {
                "grape": {
                "description": "Type of grape",
                "enum": [
                    "CabernetSauvignon",
                    "Chardonnay",
                    "PinotNoir",
                    null
                ],
                "type": [
                    "string",
                    "null"
                ]
                },
                "harvest": {
                "description": "Harvest number",
                "type": "integer"
                },
                "organic_certified": {
                "description": "Certificate authenticating whether it is organic or not",
                "type": [
                    "boolean",
                    "null"
                ]
                },
                "origin": {
                "description": "Origin of the grape",
                "type": "string"
                },
                "temperature_control": {
                "additionalProperties": false,
                "description": "Values to be changed in the temperature control event",
                "properties": {
                    "last_check": {
                    "description": "Timestamp of last check",
                    "type": "integer"
                    },
                    "temperature_ok": {
                    "description": "Value that corroborates whether the wine cold chain has been complied with",
                    "type": "boolean"
                    }
                },
                "required": [
                    "last_check",
                    "temperature_ok"
                ],
                "type": "object"
                }
            },
            "required": [
                "harvest",
                "grape",
                "origin",
                "organic_certified",
                "temperature_control"
            ],
            "type": "object"
            }
        }
        ]
    },
    "active": true
}
Last updated on