---
title: "Introduction and Quickstart for Seven Bridges API R Client"
date: "`r Sys.Date()`"
output:
  rmarkdown::html_document:
    toc: true
    toc_float: true
    toc_depth: 4
    number_sections: true
    theme: "flatly"
    highlight: "textmate"
    css: "sevenbridges.css"
vignette: >
  %\VignetteEngine{knitr::rmarkdown}
  %\VignetteIndexEntry{Introduction and Quickstart for Seven Bridges API R Client}
  %\VignetteEncoding{UTF-8}
---

<a name="top"></a>

```{r, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  eval = FALSE
)
```


`Important note:` This is a work-in-progress project to update the 
`sevenbridges2` package. Accordingly, this vignette will also change as new 
features are implemented.

# Introduction

`sevenbridges2` is an R package that provides an interface for the Seven Bridges 
public API. The supported platforms include the 
[Seven Bridges Platform](https://igor.sbgenomics.com/), 
[Cancer Genomics Cloud (CGC)](https://www.cancergenomicscloud.org), 
[BioData Catalyst (BDC)](https://platform.sb.biodatacatalyst.nhlbi.nih.gov/) and [CAVATICA](https://cavatica.sbgenomics.com).

Learn more from our documentation on the 
[Seven Bridges Platform](https://docs.sevenbridges.com/page/api), 
[Cancer Genomics Cloud (CGC)](https://docs.cancergenomicscloud.org/v1.0/page/the-cgc-api),
[BioData Catalyst (BDC)](https://sb-biodatacatalyst.readme.io/reference/new-1)
and [CAVATICA](https://docs.cavatica.org/reference/the-api).

Unlike the current `sevenbridges` package that is built on top of 
[Reference classes](http://adv-r.had.co.nz/R5.html), 
the `sevenbridges2` package is based on more modern and lightweight 
[R6](https://adv-r.hadley.nz/r6.html) classes. 
However, the basic idea and way of constructing API requests is largely 
preserved.

## R Client for the Seven Bridges API

In order to use the `sevenbridges2` package users must authenticate themselves
first by creating an Auth object and providing necessary credentials. 
You can read more about the authentication types in our next chapters.

The `sevenbridges2` package only supports v2+ versions of the API, since 
versions prior to v2 are not compatible with the Common Workflow Language (CWL). 
This package provides a simple interface for accessing and trying out various 
methods.

## Installation

The `sevenbridges2` package is available on CRAN and Seven Bridges Github 
repository.

To install it from `CRAN`, use simply:
```{r}
# Install package from CRAN
install.packages("sevenbridges2")
```

To install the development version from the `develop` branch on our Github, use
the `remotes` package:

```{r}
# Install package from github
remotes::install_github(
  "sbg/sevenbridges2",
  build_vignettes = TRUE, dependencies = TRUE
)
```
If you have trouble with `pandoc` and do not want to install it, set 
`build_vignettes = FALSE` to avoid the vignettes build.

## API General Information

There are two ways of constructing API calls. For instance, you can use 
low-level API calls which use arguments like `path`, `query`, and `body`. 
These are documented in the API reference libraries for the [Seven Bridges Platform](https://docs.sevenbridges.com/reference#list-all-api-paths) and the [CGC](https://docs.cancergenomicscloud.org/docs/new-1). An example of a low-level
request to "list all projects" is shown below. 
In this request, you can also pass `query` and `body` as a list.

```{r}
# Load the package
library("sevenbridges2")

# Authenticate
a <- Auth$new(token = "<your_token>", platform = "aws-us")

# List all projects with raw api() function
a$api(path = "projects", method = "GET")
```

***(Advanced user option)*** The second way of constructing an API request is 
to directly use the [httr2](https://httr2.r-lib.org/) package to make your 
API calls.

The `sevenbridges2` package is organized by main resources from the 
Seven Bridges API reference. 
There we have groups of endpoints to work with projects, files, apps, tasks, 
invoices, volumes, etc.
For each group of resources, there is a set of operations such as `query()`, 
`get()` and `delete()` which are common, as well as other custom operations. 

Before we start, keep in mind the following:

__`offset` and `limit`__

Almost every API call accepts two arguments named `offset` and `limit`.

- Offset defines where the retrieved items start.
- Limit defines the number of items you want to get.

By default, `offset` is set to `0` and `limit` is set to `50`. As such, your 
API request returns the __first 50 items__ when you list items or search for 
items by name. To search and list all items, use `complete = TRUE` 
if you are using the core `api()` function in your API request, or the `all()` 
operation within the `Collection` object you've received as the result. 

__`Collection`__

Every API call that returns a list of items (usually the output from `query()` operations), operations), like fetching projects, files, apps etc, wraps the 
results into a general `Collection` class object containing the `items` field 
from which users may access the items returned. 
Additional options that the `Collection` class offers are to navigate between 
pages of results, for example, to load next or previous page of results by 
calling `next_page()` and `prev_page()` methods.

Moreover, users can fetch all results using `Collection`'s `all()` method which 
is a shortcut to send multiple API calls for each next page and collect all 
results. Keep in mind the `limit` used, as well as the API rate limit.

```{r}
# Create a collection of files
public_files <- a$files$query(project = "admin/sbg-public-data")

# Load next 50 results
public_files$next_page()

# Load previous 50 results
public_files$prev_page()

# Load all results
public_files$all()
```

Lastly, printing `Collection` objects will print the first 10 items (if there 
are more than 10 items in the results) by default, but this can be changed with 
the `n` parameter in its `print()` function: 

```{r}
# Create a collection of files
public_files <- a$files$query(project = "admin/sbg-public-data")

# Default print
public_files

# Print 20 items
public_files$print(n = 20)
```

__Search by ID__

When searching by ID (usually it's the resource's `get()` operation), 
your request will return your exact resource as it is unique. Therefore, 
you do not have to set `offset` and `limit` manually. 
It is good practice to find your resources by their ID and pass this ID as an 
input to your task. You can find a resource's ID in the final part of the URL 
in the visual interface or via API requests to list resources or get a 
resource's details.

__Search by name__

Search by name as criteria in the `query()` operations of Resources, returns 
all exact or partial matches depending on the resource. 

For example, to list all public files, use the `admin/sbg-public-data` project 
query parameter, while if you want to find an exact file by name, 
set its `name` parameter to the exact value (partial search by name is not 
possible for files). 

```{r}
# Search all public files
public_files <- a$files$query(project = "admin/sbg-public-data")

# Search files by name
file_1000G_omni <- a$files$query(
  project = "admin/sbg-public-data",
  name = "1000G_omni2.5.b37.vcf"
)
```

On the other hand, partial search by name works for Projects and Apps resources. 
You can set the corresponding `name` or `query_terms` parameters for this use 
case. 
In order to query public apps, set the `visibility` parameter to 'public'. 

```{r}
# Search all public apps containing the STAR term
public_star_apps <- a$apps$query(
  visibility = "public",
  query_terms = list("STAR")
)

# Search all projects that contain "demo" in the name
demo_projs <- a$projects$query(name = "demo")
```

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# Quickstart

## Create `Auth` Object

Before you can access your account via the API, you have to provide your 
credentials. You can obtain your credentials in the form of an ["authentication token"](https://docs.sevenbridges.com/v1.0/docs/get-your-authentication-token) 
from the **Developer Tab** under **Account Settings** in the visual interface. 
Once you've obtained this, create an `Auth` object, so it remembers your 
authentication token and the path for the API. 
All subsequent requests will use these two pieces of information.

Let's load the package first:

```{r}
# Load package
library("sevenbridges2")
```

You have three different ways to provide your token. 
Choose from one of the methods below:

1. [Direct authentication.](#method1) Here you should provide your developer 
token and a base URL for the platform of interest (alternatively, you can 
provide the name of the platform - these are the available options `cgc`, 
`aws-us`, `aws-eu`, `ali-cn`, `cavatica`, `f4c` - the default platform is 
`aws-us`) as function call arguments to `Auth$new()`. This will create the 
platform authentication object and temporarily set up your token and platform 
base URL as environment variables `SB_AUTH_TOKEN` and `SB_API_ENDPOINT`. 
This way, your token will not be directly stored in the Auth object, but you 
will still be able to access it by calling the `get_token()` method. 
Keep in mind that these environment variables are session-specific and are
deleted when the session ends.

2. [Authentication via system environment variables.](#method2) By default 
this will read the credential information from two existing system environment 
variables: `SB_API_ENDPOINT` and `SB_AUTH_TOKEN`. Of course, assuming that you 
have previously set these environment variables. Alternatively, you can specify 
the names of the system environment variables you want to be loaded using the 
`sysenv_token` and `sysenv_url` arguments.

3. [Authentication via the user configuration file.](#method3) This file, by 
default `$HOME/.sevenbridges/credentials`, provides an organized way to collect 
and manage all your API authentication information for Seven Bridges platforms.

If you need to be logged into multiple accounts at the same time (which can 
also be for different platforms), please use either the second or the third 
method.

<a name="method1"/>**Method 1: Direct authentication**

This is the most common method to construct the `Auth` object. For example:

```{r}
# Authenticate with direct method
a <- Auth$new(platform = "aws-us", token = "<your-token>")
```

<a name="method2"/>**Method 2: Environment variables**

To set the two environment variables in your system, you could use
the function `sbg_set_env()`. For example:

```{r}
# Set environment variables
sevenbridges2:::sbg_set_env(
  url = "https://api.sbgenomics.com/v2/",
  token = "<your_token>"
)
```

Note that these environment variables are session-specific.

Create an `Auth` object:

```{r}
# Authenticate using environment variables
a <- Auth$new(from = "env")
```

<a name="method3"/>**Method 3: User configuration file**

Assume we have already created the configuration file named
`credentials` under the directory `$HOME/.sevenbridges/`:

```
[aws-us-<username>]
api_endpoint = https://api.sbgenomics.com/v2
auth_token = token_for_this_user

# another user on the same platform
[aws-us-rosalind-franklin]
api_endpoint = https://api.sbgenomics.com/v2
auth_token = token_for_this_user

[cgc]
api_endpoint = https://cgc-api.sbgenomics.com/v2
auth_token = token_for_this_user

[bdc]
api_endpoint = https://api.sb.biodatacatalyst.nhlbi.nih.gov/v2/
auth_token = token_for_this_user
```

To load the user profile `aws-us-<username>` from this configuration 
file, simply use:

```{r}
# Load aws-us-<username> profile for authentication
a <- Auth$new(
  from = "file",
  profile_name = "aws-us-<username>"
)
```

If `profile_name` is not specified, we will try to load the profile 
named `[default]`:

```{r}
# Load default profile
a <- Auth$new(from = "file")
```

The option based on the use of a configuration file also enables simultaneous 
authentication from multiple accounts. 
Assuming that we have a configuration file like the one listed above, 
and that we want to create authentication objects for two profiles 
(`default` and `aws-us-<username>`), we can achieve this in 
the following way:

```{r}
# Create Auth object with 'default' account
a <- Auth$new(from = "file", profile_name = "default")

# Create Auth object with 'aws-us-<username>' account
b <- Auth$new(from = "file", profile_name = "aws-us-<username>")
```


***Note:*** API paths (base URLs) differ for each Seven Bridges environment. 
Be sure to provide the correct path for the environment you are using. 
API paths for some of the environments are:

+-------------------------------------------+---------------------------------------------------+---------------+
| Platform Name                             | API Base URL                                      | Short Name    |
+===========================================+===================================================+===============+
| Seven Bridges Platform (US)               | `https://api.sbgenomics.com/v2`                   | `"aws-us"`    |
+-------------------------------------------+---------------------------------------------------+---------------+
| Seven Bridges Platform (EU)               | `https://eu-api.sbgenomics.com/v2`                | `"aws-eu"`    |
+-------------------------------------------+---------------------------------------------------+---------------+
| Seven Bridges Platform (China)            | `https://api.sevenbridges.cn/v2`                  | `"ali-cn"`    |
+-------------------------------------------+---------------------------------------------------+---------------+
| Cancer Genomics Cloud (CGC)               | `https://cgc-api.sbgenomics.com/v2`               | `"cgc"`       |
+-------------------------------------------+---------------------------------------------------+---------------+
| Cavatica                                  | `https://cavatica-api.sbgenomics.com/v2`          | `"cavatica"`  |
+-------------------------------------------+---------------------------------------------------+---------------+
| BioData Catalyst Powered by Seven Bridges | `https://api.sb.biodatacatalyst.nhlbi.nih.gov/v2` | `"f4c"`       |
+-------------------------------------------+---------------------------------------------------+---------------+


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Please check `vignette("Authentication_and_Billing", package = "sevenbridges2")` for more technical details about all available authentication methods.

## Get User Information

<a name="youruser"/>**Get your own information**

This call returns information about your account.

```{r}
# Get currently authenticated user info
a$user()
```

```
── User ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• country: United States
• affiliation: SBG
• last_name: Test
• first_name: User
• email: <user>@sbgenomics.com
• username: <username>
• href: https://api.sbgenomics.com/v2/users/<user>
```

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**Get information about a user**

This call returns information about the specified user. Note that currently 
you can view only your own user information, so this call is equivalent to 
the [call to get information about your account](#youruser).

```{r}
# Get user info
a$user(username = "<username>")
```

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Please check `vignette("Authentication_and_Billing", package = "sevenbridges2")` for more technical details about
getting user information.

## Rate Limit

This call returns information about your current rate limit. This is the 
number of API calls you can make in five minutes. This call also returns 
information about your current instance limit.

```{r}
# Get rate limit info
a$rate_limit()
```

```
── Rate Limit ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• rate
  • limit: 1000
  • remaining: 1000
  • reset: 2022-12-26 11:31:01 CET
• instance
  • limit: 25
  • remaining: 25
```

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Please check `vignette("Authentication_and_Billing", package = "sevenbridges2")` for more technical details about
rate limit information.

## Show Billing Information

Each project must have a Billing Group associated with it. This Billing 
Group pays for the storage and computation in the project.

For example, your first project(s) were created with the free funds from 
the Pilot Funds Billing Group assigned to each user at sign-up.

To get information about your billing groups:

```{r}
# Check your billing info
a$billing_groups$query()
```

This call lists all your billing groups, including groups that are pending 
or have been disabled.

To get information about your invoices:

```{r}
# Check your invoices
a$invoices$query()
```

The call returns information about all your available invoices, unless you use 
the `billing_group_id` query parameter to specify the ID of a particular 
billing group, in which case it will return the invoice incurred by that 
billing group only.

To get detailed information for a specific billing group, please use the 
billing_group method with the billing group ID. The information returned 
includes the billing group owner, the total balance, and the status of the 
billing group (pending, disabled,...). 

```{r}
# Get a single billing group
a$billing_groups$get(id = "<billing_group_id>")
```

```
── Billing group info ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• disabled: FALSE
• pending: FALSE
• type: regular
• name: My billing group
• owner: <bg_owner's_username>
• id: <billing_group_id>
• href: https://api.sbgenomics.com/v2/billing/groups/<billing_group_id>
• balance
  • currency: USD
  • amount: 221
```

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Please check `vignette("Authentication_and_Billing", package = "sevenbridges2")` for more technical details about
billing informations.

## List and query projects

Projects are the core building blocks of the platform. Each project corresponds 
to a distinct scientific investigation, serving as a container for its data, 
analysis tools, results, and collaborators.

In order to query and explore all projects, use the `projects` 
resource path and the `query()` method. One can also filter the projects by 
several criteria, like project's name and tags. 
The search by name is partial and case-insensitive. 

```{r}
# List first 5 projects
my_projects <- a$projects$query(limit = 5)
my_projects

# Load next page of results
my_projects$next_page()

# Return all projects that contain the term "demo"
demo_projects <- a$projects$query(name = "demo")

# Return all projects tagged with "demo"
tagged_projects <- a$projects$query(tags = list("demo"))
```

Note that the output is the `Collection` object and the results (list of 
`Project` objects) can be found within the `items` field.

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
projects.

## Create a new project

Create a new project called "API testing" with the billing group `id` obtained 
above.

```{r}
# List all available billing groups for currently logged in user
a$billing_groups$query()

# Set the billing group for the new project
bid <- "<billing_group_id>"

# Create a new project
p <- a$projects$create(
  name = "API testing", billing_group = bid,
  description = "This project has been created using the sevenbridges2 R API
  library."
)
```

```
── Project ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• category: PRIVATE
• root_folder: <root_folder_id>
• type: v2
• description: This project has been created using the sevenbridges2 R API library.
• billing_group: <billing_group_id>
• name: API testing
• id: <your_username_or_division>/api-testing
• href: https://api.sbgenomics.com/v2/projects/<your_username_or_division>/api-testing
• settings
  • locked: FALSE
  • controlled: FALSE
  • location: aws:us-east-1
  • use_interruptible_instances: TRUE
  • use_memoization: FALSE
  • intermediate_files: list(duration = 24, retention = "LIMITED")
  • allow_network_access: TRUE
  • use_elastic_disk: FALSE
```

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The **new project** is created on the platform. Notice also that the variable 
`p` is an R6 object with fields that contain information about the platform 
project. The facility also has several methods that allow you to perform 
basic platform operations on the project.

Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
projects.

## Get details of a specified project

Use the `get()` method and provide the full ID of the project you would like to 
fetch.

```{r}
# Get a single project by ID
a$projects$get(id = "<your_username_or_division>/api-testing")
```

```
── Project ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• category: PRIVATE
• root_folder: <root_folder_id>
• type: v2
• description: This project has been created using the sevenbridges2 R API library.
• billing_group: <billing_group_id>
• name: API testing
• id: <your_username_or_division>/api-testing
• href: https://api.sbgenomics.com/v2/projects/<your_username_or_division>/api-testing
• settings
  • locked: FALSE
  • controlled: FALSE
  • location: aws:us-east-1
  • use_interruptible_instances: TRUE
  • use_memoization: FALSE
  • intermediate_files: list(duration = 24, retention = "LIMITED")
  • allow_network_access: TRUE
  • use_elastic_disk: FALSE
```

Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
apps.

## Copy app into the project

Seven Bridges maintains workflows and tools available to all of its users in 
the Public Apps repository.

To find out more about public apps, you can do the following:

- Browse them online. Check out the 
[tutorial](https://docs.sevenbridges.com/docs/search-for-an-app) in the 
"Find apps" section.
- You can use the `sevenbridges2` package to find it, as shown below.

```{r}
# Search by name matching, with limit 10
public_apps <- a$apps$query(
  visibility = "public",
  limit = 10,
  query_terms = list("STAR")
)

# Search by ID
star_app <- a$apps$get(
  id = "admin/sbg-public-data/rna-seq-alignment-star/0"
)
```

Now, copy the App your `project` with a new `name`, following this logic.

```{r}
# Copy app into the project
a$apps$copy(
  app = star_app,
  project = "<username_or_division>/api-testing",
  name = "New copy of STAR"
)

# Check if it is copied
p <- a$projects$get(id = "<username_or_division>/api-testing")

# List the apps you have in your project
p$list_apps()
```

The short name is changed to `newcopyofstar`.

```
== App ==
id : <username_or_division>/api-testing/newcopyofstar/0
name : RNA-seq Alignment - STAR
project : <username_or_division>/api-testing
revision : 0
```

Alternatively, you can copy it from the `App` object.

```{r}
# Get public app RNA Sequencing alignment - STAR
star_app <- a$apps$get(
  id = "admin/sbg-public-data/rna-seq-alignment-star/0"
)

# Copy it into a project
star_app$copy(
  project = "<username_or_division>/api-testing",
  name = "Copy of STAR"
)
```

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Next, we would like to run a task with this app. Let's see what is required.

Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
tasks.

## Execute a new task

### Find your app inputs

Once you have copied the public app 
`admin/sbg-public-data/rna-seq-alignment-star/0` into your project, 
`<username>/api-testing`, the app `id` in your current project is 
`<username>/api-testing/newcopyofstar`. 
Alternatively, you can use another app you already have in your project for 
this Quickstart.

To draft a new task, you need to specify the following:

- The name of the task
- An optional description
- The App object or `id` of the workflow you are executing
- The inputs for your workflow. 

You can always check the App details on the visual interface for task input 
requirements. However, there is also a function on the App objects to get 
basic information about app's inputs and outputs. 
To find the required inputs with R, you need to get an `App` object first.

Let's check which inputs this app requires by calling the `input_matrix()`
function and bring them into our project.

```{r}
# Fetch copied app
copied_star_app <- a$apps$get(
  id = "<username_or_division>/api-testing/newcopyofstar/0"
)

# Preview its inputs
copied_star_app$input_matrix()
```

Locate the IDs of the required inputs. Note that task inputs need to match 
the expected data type and name. In the above example, we see two required 
fields:

- **fastq:** This input takes a file array in the following formats: FASTA, 
FASTQ, FA, FQ etc.
- **genomeFastaFiles:** This is a single reference file in the FASTA, FA, FNA 
or TAR format.

We also want to provide a gene feature file:

- **sjdbGTFfile:** A file array that can be in the GTF, GFF, GFF2, or GFF3 
format.

You can find a list of possible input types below:

- **number, character or integer:** you can directly pass these to the input 
parameter as they are.
- **enum type:** Pass this value to the input parameter.
- **file:** This input is a file. However, while some inputs accept only a 
single file (`File`), other inputs take more than one file (`File` arrays, 
`FilesList`, or '`File...`' ). This input requires you to pass a single `File` 
object (for a single file input) or list of `File` objects (for inputs which 
accept more than one file). 
You can search for your file by `id` or by `name`, as shown in the example 
below.

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### Prepare your input files

```{r}
# Get reads (fastq) files and and copy them into a project
reads_1 <- a$files$get(id = "641c48c425ed1842bd0bf799") # file id
reads_1$copy_to(project = p)

reads_2 <- a$files$get(id = "641c48c425ed1842bd0bf835") # file id
reads_2$copy_to(project = p)

# Get a single file reference file and copy into a project
fasta_in <- a$files$get(id = "641c48c525ed1842bd0bf86a") # file id
fasta_in$copy_to(project = p)

# Get gtf file and copy into a project
gtf_in <- a$files$get(id = "641c48c425ed1842bd0bf825") # file id
gtf_in$copy_to(project = p)

# Get copied files
input_files <- p$list_files()$items
```

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### Create a new draft task

```{r}
# Add new tasks
taskName <- paste0("STAR-alignment ", date())

tsk <- p$create_task(
  name = taskName,
  description = "STAR test",
  app = copied_star_app,
  inputs = list(
    "fastq" = c(input_files[[1]], input_files[[2]]),
    "genomeFastaFiles" = input_files[[3]],
    "sjdbGTFfile" = list(input_files[[4]])
  )
)

# Preview task
tsk$print()
```

### Preview your app's expected outputs

Similarly as with inputs, you can also preview the structure of the expected
outputs of the task or workflow. You can get details about the output's name,
description and type using `output_matrix()`. 
This function can be called from the App object.

```{r}
# Get app's outputs details
copied_star_app$output_matrix()
```

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
tasks.

## Run a Task

Now, we are ready to run our task.

```{r}
# Run your task
tsk$run()
```

Before you run your task, you can adjust your draft task if you have any final 
modifications. 
```{r}
# Update task
tsk$update(description = "New RNA SEQ Alignment - STAR task")
```

After you run a task, you can track its status by refreshing the object with
`reload()` function.

```{r}
# Reload task
tsk$reload()
tsk$status
```

You can also abort the task execution if needed:
```{r}
# Abort your task
tsk$abort()
```

If you want to rerun your task without any modifications, you can use 
`rerun()` function which will clone the current task for you and start the 
execution immediately.
```{r}
# Rerun your task
tsk$rerun()
```

On the other side, if you want to update your task first and then re-run it, 
you should clone the current task, update it and then run it, as demonstrated 
below:
```{r}
# First clone existing task
cloned_task <- tsk$clone_task()

# Then, update GTF input file in the cloned task
cloned_task$update(inputs = list(sjdbGTFfile = "<some new file>"))
cloned_task$run()
```

Alternatively, you can delete the draft task if you no longer wish to run it.
```{r}
# # not run
# tsk$delete()
```

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
running tasks.

## Run tasks using spot instances

Running tasks with [spot instances](https://docs.sevenbridges.com/docs/about-spot-instances)
could potentially [reduce a considerable amount of computational cost](https://www.sevenbridges.com/spot-instances-cost-reduction/).
This option can be controlled on the project level or the task level on 
Seven Bridges platforms. Our package follows the same [logic](https://docs.sevenbridges.com/docs/use-spot-instances)
as our platform's web interface (the current default setting for spot instances 
is **on**).

For example, when we create a project using Projects resource's method `create()`,
we can set `use_interruptible = FALSE` to use on-demand instances
(non-interruptible but more expensive) instead of the spot instances
(interruptible but cheaper):

```{r}
# Create project with disabled spot instances
p <- a$projects$create(
  name = "spot-disabled-project", bid, description = "spot disabled project",
  use_interruptible = FALSE
)
```

Then all the new tasks created under this project will use on-demand instances
to run **by default**, unless an argument `use_interruptible_instances`
is specifically set to `TRUE` when drafting the new task using Tasks resource
method `create()`.

For example, if `p` is the above spot disabled project, to draft
a task that will use spot instances to run:

```{r}
# Create task and set usage of interruptible instances to TRUE
tsk <- p$create_task(
  name = paste0("spot enabled task in a spot disabled project"),
  description = "spot enabled task",
  app = copied_star_app,
  inputs = list(
    "fastq" = c(input_files[[1]], input_files[[2]]),
    "genomeFastaFiles" = input_files[[3]],
    "sjdbGTFfile" = list(input_files[[4]])
  ),
  use_interruptible_instances = TRUE
)
```

Conversely, you can have a spot instance enabled project,
but draft and run specific tasks using on-demand instances,
by setting `use_interruptible_instances = FALSE` in `create_task()` explicitly.

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
running tasks using spot instances.

## Execution hints per task run

During workflow development and benchmarking, sometimes we need to view and 
make adjustments to the computational resources needed for a task to run more 
efficiently. Also, if a task fails due to resource deficiency, we often want to 
define a larger instance for the task re-run without editing the app itself. 
This is particularly important in cases where there is not enough disk space.

The Seven Bridges API allows setting specific task execution parameters by 
using `execution_settings`. It includes the instance type (`instance_type`) 
and the maximum number of parallel instances (`max_parallel_instances`):

```{r}
# Create task with setting instance type and number of parallel instances
tsk <- p$create_task(
  ...,
  execution_settings = list(
    instance_type = "c4.2xlarge;ebs-gp2;2000",
    max_parallel_instances = 2
  )
)
```

For details about `execution_settings`, please check [create a new draft task](https://docs.sevenbridges.com/reference/create-a-new-task).

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
execution hints.

## Draft a batch task

Now let's do a batch with 4 files in 2 groups, which is batched by metadata 
`sample_id`. We will assume each file has this metadata field entered.
Since these files can be evenly grouped into 2, we will have a single parent 
batch task with 2 child tasks.

```{r}
# Add two more fastq files that will be used in our task inputs
# and copy them into our API testing project
reads_3 <- a$files$get(id = "641c48c425ed1842bd0bf7b6") # file id
reads_3$copy_to(project = p)

reads_4 <- a$files$get(id = "641c48c425ed1842bd0bf7a5") # file id
reads_4$copy_to(project = p)

# Get all project files
input_files <- p$list_files()$items

taskName <- paste0("STAR-alignment ", date())

# Create task with batch criteria
tsk <- p$create_task(
  name = taskName,
  description = "Batch Star Test",
  app = copied_star_app,
  batch = TRUE,
  batch_input = "fastq",
  batch_by = list(
    type = "CRITERIA",
    criteria = list("metadata.sample_id")
  ),
  inputs = list(
    "fastq" = c(
      input_files[[1]],
      input_files[[2]],
      input_files[[3]],
      input_files[[4]]
    ),
    "genomeFastaFiles" = input_files[[5]],
    "sjdbGTFfile" = list(input_files[[6]])
  )
)

# Run batch task
tsk$run()
```

Now you have a draft batch task. Please check it out in the visual interface. 
Your response body should inform you of any errors or warnings.

You can also check the parent task's children status with `list_batch_children()`
method and then for each child execution details:
```{r}
# List parent task children and their execution details
child_tasks <- tsk$list_batch_children()

child1_details <- child_tasks$items[[1]]$get_execution_details()
child2_details <- child_tasks$items[[2]]$get_execution_details()
```

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Please check `vignette("Projects_and_Tasks_execution", package = "sevenbridges2")` for more technical details about
running batch tasks.
