# Parameters Recall
```bash
./envman init demo --type development azriel91/web_app 0.1.1
# For good user experience, parameters
# should not have to be passed in on
# every command invocation
./envman status # demo --type development azriel91/web_app 0.1.1
./envman deploy # demo --type development azriel91/web_app 0.1.1
```
We need to store and load the parameters passed in previously.
```dot process
digraph {
graph [
margin = 0.0
penwidth = 0
nodesep = 0.0
ranksep = 0.02
bgcolor = "transparent"
fontname = "helvetica"
fontcolor = "#7f7f7f"
rankdir = LR
// splines = curved
]
node [
fontcolor = "#111111"
fontname = "monospace"
fontsize = 12
shape = "circle"
style = "filled"
width = 0.3
height = 0.3
margin = 0.04
color = "#9999aa"
fillcolor = "#ddddf5"
]
edge [
arrowsize = 0.7
color = "#7f7f7f"
fontcolor = "#7f7f7f"
]
subgraph cluster_a {
a [label = <<b>a</b>>]
a_text [shape="plain" style="" fontcolor="#7f7f7f" label = <<table border="0" cellborder="0" cellpadding="0"><tr>
<td><font point-size="15">📥</font></td>
<td balign="left">file<br/>download</td>
</tr></table>>]
subgraph cluster_a_params {
a_params_src [
label = "src"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
a_params_dest [
label = "dest"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
a_state [
label = < .. <br align="left"/>>
margin = 0.05
fontsize = 8
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffffaa"
color = "#667722"
]
}
a_params_src -> a_state [style = invis]
a_params_dest -> a_state [style = invis]
a -> a_state [style = invis]
}
subgraph cluster_b {
b [label = <<b>b</b>>]
b_text [shape="plain" style="" fontcolor="#7f7f7f" label = <<table border="0" cellborder="0" cellpadding="0"><tr>
<td><font point-size="15">🪣</font></td>
<td balign="left">s3<br/>bucket</td>
</tr></table>>]
subgraph cluster_b_params {
b_params_name [
label = "name"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
b_state [
label = <<b>S3BucketState</b> <br align="left"/> name<br align="left"/>>
margin = 0.05
fontsize = 8
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffffaa"
color = "#667722"
]
}
b_params_name -> b_state [style = invis]
b -> b_state [style = invis]
}
subgraph cluster_c {
c [label = <<b>c</b>>]
c_text [shape="plain" style="" fontcolor="#7f7f7f" label = <<table border="0" cellborder="0" cellpadding="0"><tr>
<td><font point-size="15">📤</font></td>
<td balign="left">s3<br/>object</td>
</tr></table>>]
subgraph cluster_c_params {
c_params_file_path [
label = "file_path"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
c_params_bucket_name [
label = "bucket_name"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
c_params_object_key [
label = "object_key"
margin = 0.0
fontsize = 8
width = 0.78
height = 0.19
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffaaff"
color = "#773377"
]
c_state [
label = < .. <br align="left"/>>
margin = 0.05
fontsize = 8
shape = "rectangle"
style = "filled,rounded"
fillcolor = "#ffffaa"
color = "#667722"
]
}
c_params_file_path -> c_state [style = invis]
c_params_bucket_name -> c_state [style = invis]
c_params_object_key -> c_state [style = invis]
c -> c_state [style = invis]
}
a -> b [minlen = 9, weight = 5]
b -> c [minlen = 9, weight = 5]
subgraph params {
label = "Pre-execution\nknown values"
cluster = false
node [
shape = none
fontsize = 8
margin = 0.05
height = 0.1
style = ""
]
edge [
color = "#4455ff"
arrowhead = "vee"
style = dashed
]
web_app_url;
web_app_path;
bucket_name;
object_key;
web_app_url -> a_params_src [constraint = true]
web_app_path -> a_params_dest [constraint = true]
{
edge [
color = "#cc7744"
]
bucket_name -> b_params_name [constraint = true, minlen = 10]
}
{
edge [
color = "#449988"
]
a_state -> c_params_file_path [constraint = false, style = invis]
b_state -> c_params_bucket_name [constraint = true]
}
web_app_path -> c_params_file_path [constraint = true, color = "#44dd77", minlen = 19]
object_key -> c_params_object_key [constraint = true, color = "#44dd77", minlen = 19]
}
}
```
First command invocation:
```rust ,ignore
// examples/envman/src/cmds/profile_init_cmd.rs
// fn app_upload_flow_init
cmd_ctx_builder
.with_profile_from_workspace_param(profile_key)
.with_flow(flow)
.with_item_params::<FileDownloadItem<WebApp>>(
item_id!("app_download"),
app_download_params_spec,
)
.with_item_params::<S3BucketItem<WebApp>>(
item_id!("s3_bucket"),
s3_bucket_params_spec,
)
.with_item_params::<S3ObjectItem<WebApp>>(
item_id!("s3_object"),
s3_object_params_spec,
)
.await?
```
Subsequent command invocations:
```rust ,ignore
// examples/envman/src/cmds/app_upload_cmd.rs
cmd_ctx_builder
.with_profile_from_workspace_param(&profile_key)
.with_flow(&flow)
// * file_download params spec not specified
// * s3_bucket params spec not specified
.with_item_params::<S3ObjectItem<WebApp>>(
item_id!("s3_object"),
s3_object_params_spec,
)
.await?
```
```rust ,ignore
let s3_object_params_spec = S3ObjectParams::<WebApp>::field_wise_spec()
// Note:
//
// * file_path not specified
// * object key not specified
// * Function logic cannot be deserialized,
// so needs to be provided
.with_bucket_name_from_map(|s3_bucket_state: &S3BucketState| {
match s3_bucket_state {
S3BucketState::None => None,
S3BucketState::Some {
name,
creation_date: _,
} => Some(name.clone()),
}
})
.build();
```
