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[iov-cli] Add wait() function to repl #181

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merged 2 commits into from Jul 20, 2018
Merged

[iov-cli] Add wait() function to repl #181

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3925400
Install deasync2
Jul 20, 2018
b2cf1e6
Add wait() method to repl
Jul 20, 2018
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10 changes: 2 additions & 8 deletions packages/iov-cli/README.md
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Expand Up @@ -14,13 +14,7 @@ How to use the web4 cli
> profile.getIdentities(0)
[]

> profile.createIdentity(0)

> profile.getIdentities(0)
[ { pubkey: { algo: 'ed25519', data: [Object] },
label: undefined } ]

> const mainIdentity = profile.getIdentities(0)[0]
> const mainIdentity = wait(profile.createIdentity(0))

> mainIdentity.pubkey
{ algo: 'ed25519',
Expand Down Expand Up @@ -92,7 +86,7 @@ const sendTx: SendTx = {
7. and restore

```
> var profileFromDb; UserProfile.loadFrom(db, "secret passwd").then(p => { profileFromDb = p })
> const profileFromDb = wait(UserProfile.loadFrom(db, "secret passwd"));
> profileFromDb
UserProfile {
createdAt: 2018-07-04T16:07:14.583Z,
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3 changes: 3 additions & 0 deletions packages/iov-cli/init
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Expand Up @@ -6,6 +6,7 @@ import { bnsCodec } from "@iov/bns";
import { Encoding } from '@iov/encoding';
import { Ed25519SimpleAddressKeyringEntry, UserProfile } from '@iov/keycontrol';
import { AddressBytes, ChainId, Nonce, SendTx, TokenTicker, TransactionKind } from "@iov/types";
function wait<T>(promise: Promise<T>): T { return require('deasync2').await(promise); }
console.log(colors.green('Done initializing session for you. Have fun!'));
console.log(colors.yellow('Available imports:'));
console.log(colors.yellow(' * leveldown'));
Expand All @@ -26,3 +27,5 @@ console.log(colors.yellow(' - Nonce'));
console.log(colors.yellow(' - SendTx'));
console.log(colors.yellow(' - TokenTicker'));
console.log(colors.yellow(' - TransactionKind'));
console.log(colors.yellow(' * helper functions'));
console.log(colors.yellow(' - wait'));
3 changes: 2 additions & 1 deletion packages/iov-cli/package.json
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Expand Up @@ -9,10 +9,11 @@
"url": "https://github.com/iov-one/web4/tree/master/packages/iov-cli"
},
"scripts": {
"web4": "echo '\\nTo get started type: .load init\\n' && ts-node"
"web4": "echo '\\nTo get started type: .load init\\n' && NODE_NO_WARNINGS=1 ts-node"
},
"dependencies": {
"colors": "^1.3.0",
"deasync2": "https://github.com/bluelovers/deasync.git#43ace7b11",
"ts-node": "^7.0.0"
}
}
20 changes: 20 additions & 0 deletions packages/iov-cli/wait-demo.ts
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@@ -0,0 +1,20 @@
// This is an example of the non-trivial art of converting an asynchonous
// method into a synchonous one. This should only be used in the REPL where
// await is not available since the user is working in a top level scope.
//
// yarn run ts-node wait-demo.ts

function wait<T>(promise: Promise<T>): T {
return require('deasync2').await(promise);
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Would it make sense to do the require/import once at the top of the file and then just use it?

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Using it like this such that I can easily convert it into a single line command for the init file.

}

const somePromise = new Promise((resolve, _) => {
setTimeout(() => {
console.log("done! Will resolve now");
resolve("abc");
}, 2000);
})

console.log("Let's wait until we get what we need …");
const value = wait(somePromise)
console.log(value)
13 changes: 12 additions & 1 deletion yarn.lock
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Expand Up @@ -654,6 +654,10 @@ bindings@^1.3.0, bindings@~1.3.0:
version "1.3.0"
resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.3.0.tgz#b346f6ecf6a95f5a815c5839fc7cdb22502f1ed7"

bindings@~1.2.1:
version "1.2.1"
resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.2.1.tgz#14ad6113812d2d37d72e67b4cacb4bb726505f11"

bip39@^2.5.0:
version "2.5.0"
resolved "https://registry.yarnpkg.com/bip39/-/bip39-2.5.0.tgz#51cbd5179460504a63ea3c000db3f787ca051235"
Expand Down Expand Up @@ -1557,6 +1561,13 @@ dateformat@^3.0.0:
version "3.0.3"
resolved "https://registry.yarnpkg.com/dateformat/-/dateformat-3.0.3.tgz#a6e37499a4d9a9cf85ef5872044d62901c9889ae"

"deasync2@https://github.com/bluelovers/deasync.git#43ace7b11":
version "0.1.15"
resolved "https://github.com/bluelovers/deasync.git#43ace7b11b96f86a59255c398a48cb53d3f7c0dd"
dependencies:
bindings "~1.2.1"
nan "^2.0.7"

debug@2, debug@2.6.9, debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@~2.6.4, debug@~2.6.6:
version "2.6.9"
resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
Expand Down Expand Up @@ -3928,7 +3939,7 @@ mute-stream@0.0.7:
version "0.0.7"
resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"

nan@^2.10.0, nan@^2.9.2, nan@~2.10.0:
nan@^2.0.7, nan@^2.10.0, nan@^2.9.2, nan@~2.10.0:
version "2.10.0"
resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"

Expand Down