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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,63 +1,5 @@ | ||
| # Chainlink Integration | ||
| See | ||
|
|
||
| This document explains how to consume [Chainlink | ||
| oracles](https://chain.link) when unit testing, integration testing, and | ||
| actually on-chain. | ||
|
|
||
| ## Overview | ||
|
|
||
| Using Chainlink on Agoric provides two main features: | ||
| - Price feeds are exposed on Agoric via the on-chain `home.priceAuthority`. This is an | ||
| officially-sponsored [price authority](/guides/zoe/price-authority) built | ||
| from aggregating several Chainlink nodes. | ||
| - [Chainlink's Any API](https://docs.chain.link/docs/request-and-receive-data) | ||
| can initiate a job on a single oracle and return its results | ||
|
|
||
| We have tested these features with [actual Chainlink oracle | ||
| software](https://github.com/Agoric/dapp-oracle/blob/HEAD/chainlink-agoric/README.md). | ||
|
|
||
| **Note**: Chainlink has not yet (as of Nov 16, 2020) finished setting up an incentivized testnet for established Chainlink node operators to connect to Agoric. | ||
|
|
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| ## Price Authority | ||
|
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| To test your contract against a locally-simulated price authority, just follow | ||
| the instructions in [the Price Authority API](/reference/zoe-api/price-authority). | ||
|
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| To use the curated on-chain price authority, see `home.priceAuthority`. For | ||
| example, to get a quote for selling `30 Testnet.$LINK` in `Testnet.$USD`: | ||
|
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||
| (Note that this is a mock price until there are actual Chainlink nodes on the | ||
| testnet). | ||
|
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||
| ```js | ||
| const linkIssuer = E(home.wallet).getIssuer('Testnet.$LINK'); | ||
| const linkBrand = await E(linkIssuer).getBrand(); | ||
| const linkAmount = AmountMath.make(linkBrand, 30 * 10 ** 18); | ||
| const usdBrand = await E(E(home.wallet).getIssuer('Testnet.$USD')).getBrand(); | ||
| const { quoteAmount: { value: [{ amountOut: usdAmount, timestamp }] } } = await E(home.priceAuthority).quoteGiven(linkAmount, usdBrand); | ||
| ``` | ||
|
|
||
| ## Any API | ||
|
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| To use Chainlink's Any API, you need to get an instance of the | ||
| [Low-level Oracle Query Contract](/guides/zoe/contracts/oracle) and submit a | ||
| query of the form: | ||
|
|
||
| ```js | ||
| { | ||
| jobId: <Chainlink JobId>, | ||
| params: { ...<job parameters> } | ||
| } | ||
| ``` | ||
|
|
||
| The oracle node returns its result, which is a JSONable value such as a string. | ||
| This is sent as your query's reply. | ||
|
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| You can test these queries against a locally-running Chainlink node that you | ||
| control. Follow [the Chainlink integration | ||
| instructions](https://github.com/Agoric/dapp-oracle/blob/HEAD/chainlink-agoric/README.md) | ||
| to set it up. | ||
|
|
||
| There is also a more limited local node that emulates part of the Chainlink API | ||
| without having to run Docker containers. This is the [local (mock) builtin | ||
| oracle](https://github.com/agoric/dapp-oracle#running-a-local-builtin-oracle). | ||
| - [Price Authorty Guide](./zoe/price-authority) | ||
| - [PriceAuthority API](../reference/zoe-api/price-authority) | ||
| - [Deployed Zoe Contracts](./zoe/actual-contracts/) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,95 +1 @@ | ||
| # The Agoric Board | ||
|
|
||
| ## Introduction | ||
|
|
||
| The Board is a shared, on-chain location that is where users post an object as a value and make | ||
| it accessible to others. When a user posts a value, they receive a unique ID | ||
| for that value. Others can get the value just by knowing the ID. You can make | ||
| an ID known by any communication method; private email, a DM or other private | ||
| message, an email blast to a mailing list or many individuals, listing it on a website, etc. | ||
|
|
||
| In particular, the Board is frequently used to give others access to deposit | ||
| facets. After you post a deposit facet object to the Board, you distribute its | ||
| Board ID string as widely as you'd like. Anyone who has that ID can use it to | ||
| get access to its value, the deposit facet object. They can then safely deposit | ||
| assets into the facet's associated purse without being able to withdraw assets | ||
| from the purse or check its balance. | ||
|
|
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| The `ids()` method returns all of the Board's currently used IDs. | ||
| This means anyone can access any Board-stored value. The Board is public, | ||
| not private. | ||
|
|
||
| Note that when calling from the REPL's `home` object, you must use | ||
| the [`E` syntax](/guides/js-programming/eventual-send) | ||
| as shown below. | ||
|
|
||
| ## `E(home.board).getId(value)` | ||
| - `value` `{ any }` | ||
| - Returns: `{ string }` | ||
|
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| If the `value` is present in the Board, this method returns its Board-associated ID value. | ||
|
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| If the `value` is **not** present in the Board, this method adds it to the Board and assigns it | ||
| an associated ID value. It returns the new ID value. | ||
|
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||
| ```js | ||
| // Create an ID for an object that you want to make public | ||
| command[1] E(home.board).getId(auctionInvitation) | ||
| history[1] "1403739213" | ||
| // The value auctionInvitation (an Invitation object) now has the ID "1403739213" | ||
| command[2] E(home.board).getId(auctionInvitation) | ||
| history[2] "1403739213" | ||
| ``` | ||
|
|
||
| ## `E(home.board).getValue(id)` | ||
| - `id` `{ string }` | ||
| - Returns: `{ any }` | ||
|
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| Looks up the `id` value in the Board and returns the Board-associated value for that ID. | ||
|
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| With respect to the `CRC` used in an error message below, an ID has two parts, the raw id | ||
| and a [CRC](https://en.wikipedia.org/wiki/Cyclic_redundancy_check). The CRC error | ||
| happens when the passed-in id's CRC value is checked. The alleged ID is split into its | ||
| two parts, and if the CRC in the alleged ID doesn't match the CRC produced at this time | ||
| from the raw ID value, it throws the error. | ||
|
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||
| Errors: | ||
| - If the `id` value is not a string, errors with the message "id must be string" and a log of the failing `id` that was passed in. | ||
| - If the `id` value has too few digits, errors with the message "id must consist of at least 3 digits". | ||
| - If the `id` value has a different CRC value than the stored one, errors with the message "id is probably a typo, cannot verify CRC". | ||
| - If the `id` value is not in the Board, errors with the message "board does not have id: [id]". | ||
| ```js | ||
| // Continuing from the example above in getValue(), the id returns its associated value | ||
| command[3] E(home.board).getValue("1403739213") | ||
| // Returns the "abc" value | ||
| history[3] [Alleged: presence o-102]{} | ||
| ``` | ||
|
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| ## `E(home.board).has(value)` | ||
| - `value` `{ any }` | ||
| - Returns `{ boolean }` | ||
|
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| Returns `true` if the specified value has an associated Board ID. | ||
|
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| ```js | ||
| // Pass an id, not a value, so returns false | ||
| command[4] E(home.board).has("1403739213") | ||
| history[4] false | ||
| // Pass a value that does have an id in the Board, so returns true | ||
| command[5] E(home.board).has(auctionInvitation) | ||
| history[5] true | ||
| ``` | ||
|
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| ## `E(home.board).ids()` | ||
| - Returns: `{ Array of strings }` | ||
|
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| Returns an array of all IDs in the Board. Remember, the Board is public, so | ||
| anyone can access anything in it. | ||
|
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||
| ```js | ||
| command[6] E(home.board).ids() | ||
| history[6] ["604346717","381205908","1667979430","1576549616","1532665031", | ||
| "727995140","371571443","1456154132","500716545","815824725", | ||
| "262188032","1265655452","1202180815","813441138","605437304", | ||
| "1403739213"] | ||
| ``` | ||
| see [Board Name Service](../../guides/integration/name-services#the-board-publishing-under-arbitrary-names) |
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