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TEP-140: Produce Results in Matrix
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This commit enables producing Results from Matrixed PipelineTasks so that they can be used in subsequent PipelineTasks. A Pipeline author can now declare a matrixed taskRun that emits results of type string that are fanned out over multiple taskRuns and aggregated into an array of results that can then be consumed by another pipelineTask using the syntax `$(tasks.<pipelineTaskName>.results.<resultName>[*])`.

This commit also introduces 2 context variables to 1) Access Matrix Combinations Length using `tasks.<pipelineTaskName>.matrix.length` and 2) Access Aggregated Results Length using `tasks.<pipelineTaskName>.matrix.<resultName>.length`

Note: Currently, we don't support consuming a single instance/combinations of results. Authors must consume the entire aggregated results array.

Co-authored-by: Priti Desai <[email protected]>
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2 people authored and tekton-robot committed Oct 17, 2023
1 parent c9ff759 commit eb7d0ec
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84 changes: 82 additions & 2 deletions docs/matrix.md
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Expand Up @@ -17,6 +17,8 @@ weight: 406
- [Parameters in Matrix.Include.Params](#parameters-in-matrixincludeparams)
- [Specifying both `params` and `matrix` in a `PipelineTask`](#specifying-both-params-and-matrix-in-a-pipelinetask)
- [Context Variables](#context-variables)
- [Access Matrix Combinations Length](#access-matrix-combinations-length)
- [Access Aggregated Results Length](#access-aggregated-results-length)
- [Results](#results)
- [Specifying Results in a Matrix](#specifying-results-in-a-matrix)
- [Results in Matrix.Params](#results-in-matrixparams)
Expand Down Expand Up @@ -291,6 +293,38 @@ Similarly to the `Parameters` in the `Params` field, the `Parameters` in the `Ma
* `Pipeline` name
* `PipelineTask` retries


The following `context` variables allow users to access the `matrix` runtime data. Note: In order to create an ordering dependency, use `runAfter` or `taskResult` consumption as part of the same pipelineTask.

#### Access Matrix Combinations Length

The pipeline authors can access the total number of instances created as part of the `matrix` using the syntax: `tasks.<pipelineTaskName>.matrix.length`.

```yaml
- name: matrixed-echo-length
runAfter:
- matrix-emitting-results
params:
- name: matrixlength
value: $(tasks.matrix-emitting-results.matrix.length)
```

#### Access Aggregated Results Length

The pipeline authors can access the length of the array of aggregated results that were
actually produced using the syntax: `tasks.<pipelineTaskName>.matrix.<resultName>.length`. This will allow users to loop over the results produced.

```yaml
- name: matrixed-echo-results-length
runAfter:
- matrix-emitting-results
params:
- name: matrixlength
value: $(tasks.matrix-emitting-results.matrix.a-result.length)
```

See the full example here: [pr-with-matrix-context-variables]

## Results

### Specifying Results in a Matrix
Expand Down Expand Up @@ -360,8 +394,51 @@ tasks:

### Results from fanned out Matrixed PipelineTasks

Emitting `Results` from fanned out `PipelineTasks` is not currently supported.
We plan to support emitting `Results` from fanned out `PipelineTasks` in the near future.
Emitting `Results` from fanned out `PipelineTasks` is now supported. Each fanned out
`TaskRun` that produces `Result` of type `string` will be aggregated into an `array`
of `Results` during reconciliation, in which the whole `array` of `Results` can be consumed by another `pipelineTask` using the star notion [*].
Note: A known limitation is not being able to consume a singular result or specific
combinations of results produced by a previous fanned out `PipelineTask`.

| Result Type in `taskRef` or `taskSpec` | Parameter Type of Consumer | Specification |
|----------------------------------------|----------------------------|-------------------------------------------------------|
| string | array | `$(tasks.<pipelineTaskName>.results.<resultName>[*])` |
| array | Not Supported | Not Supported |
| object | Not Supported | Not Supported |

```yaml
apiVersion: tekton.dev/v1beta1
kind: Pipeline
metadata:
name: platform-browser-tests
spec:
tasks:
- name: matrix-emitting-results
matrix:
params:
- name: platform
value:
- linux
- mac
- windows
- name: browser
value:
- chrome
- safari
- firefox
taskRef:
name: taskwithresults
kind: Task
- name: task-consuming-results
taskRef:
name: echoarrayurl
kind: Task
params:
- name: url
value: $(tasks.matrix-emitting-results.results.report-url[*])
...
```
See the full example [pr-with-matrix-emitting-results]


## Retries
Expand Down Expand Up @@ -851,4 +928,7 @@ status:
[cel]: https://github.com/tektoncd/experimental/tree/1609827ea81d05c8d00f8933c5c9d6150cd36989/cel
[pr-with-matrix]: ../examples/v1/pipelineruns/alpha/pipelinerun-with-matrix.yaml
[pr-with-matrix-and-results]: ../examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-and-results.yaml
[pr-with-matrix-context-variables]: ../examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-context-variables.yaml
[pr-with-matrix-emitting-results]: ../examples/v1/pipelineruns/alpha/pipelinerun-with-matrix-emitting-results.yaml

[retries]: pipelines.md#using-the-retries-field
2 changes: 2 additions & 0 deletions docs/variables.md
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Expand Up @@ -28,10 +28,12 @@ For instructions on using variable substitutions see the relevant section of [th
| `params["<param name>"][i]` | (see above) |
| `params.<object-param-name>[*]` | Get the value of the whole object param. This is alpha feature, set `enable-api-fields` to `alpha` to use it.|
| `params.<object-param-name>.<individual-key-name>` | Get the value of an individual child of an object param. This is alpha feature, set `enable-api-fields` to `alpha` to use it. |
| `tasks.<taskName>.matrix.length` | The length of the `Matrix` combination count. |
| `tasks.<taskName>.results.<resultName>` | The value of the `Task's` result. Can alter `Task` execution order within a `Pipeline`.) |
| `tasks.<taskName>.results.<resultName>[i]` | The ith value of the `Task's` array result. Can alter `Task` execution order within a `Pipeline`.) |
| `tasks.<taskName>.results.<resultName>[*]` | The array value of the `Task's` result. Can alter `Task` execution order within a `Pipeline`. Cannot be used in `script`.) |
| `tasks.<taskName>.results.<resultName>.key` | The `key` value of the `Task's` object result. Can alter `Task` execution order within a `Pipeline`.) |
| `tasks.<taskName>.matrix.<resultName>.length` | The length of the matrixed `Task's` results. (Can alter `Task` execution order within a `Pipeline`.) |
| `workspaces.<workspaceName>.bound` | Whether a `Workspace` has been bound or not. "false" if the `Workspace` declaration has `optional: true` and the Workspace binding was omitted by the PipelineRun. |
| `context.pipelineRun.name` | The name of the `PipelineRun` that this `Pipeline` is running in. |
| `context.pipelineRun.namespace` | The namespace of the `PipelineRun` that this `Pipeline` is running in. |
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@@ -0,0 +1,123 @@
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: validate-matrix-result-length
spec:
params:
- name: matrixlength
type: string
steps:
- name: validate
image: alpine
args: ["$(params.matrixlength)"]
script: |
#!/usr/bin/env sh
echo "Validating the length of the matrix context variable"
echo "The length of the matrix is 3"
if [ "$(params.matrixlength)" != 3 ]; then
echo "Error: expected matrix to have the length 3 but has length $(params.matrixlength)"
exit 1
fi
echo "Done validating the length of the matrix context variable"
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: validate-matrix-results-length
spec:
params:
- name: matrixresultslength-1
type: string
- name: matrixresultslength-2
type: string
steps:
- name: validate
image: alpine
script: |
#!/usr/bin/env sh
echo "Validating the length of the matrix results context variable"
echo "The length of the matrix results are $(params.matrixresultslength-1) and $(params.matrixresultslength-2)"
if [ "$(params.matrixresultslength-1)" != 3 ]; then
echo "Error: expected matrix results to have the length 3 but has length $(params.matrixresultslength-1)"
exit 1
fi
if [ "$(params.matrixresultslength-2)" != 1 ]; then
echo "Error: expected matrix results to have the length 1 but has length $(params.matrixresultslength-2)"
exit 1
fi
echo "Done validating the length of the matrix context variable"
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: taskwithresults
spec:
params:
- name: IMAGE
- name: DIGEST
default: ""
results:
- name: IMAGE-DIGEST
- name: IMAGE-URL
steps:
- name: produce-results
image: bash:latest
script: |
#!/usr/bin/env bash
echo "Building image for $(params.IMAGE)"
echo -n "$(params.DIGEST)" | sha256sum | tee $(results.IMAGE-DIGEST.path)
if [ -z $(params.DIGEST) ]; then
echo -n "$(params.DIGEST)" | sha256sum | tee $(results.IMAGE-URL.path)
fi
---
apiVersion: tekton.dev/v1
kind: PipelineRun
metadata:
generateName: matrix-context-variables-
spec:
taskRunTemplate:
serviceAccountName: "default"
pipelineSpec:
tasks:
- name: matrix-emitting-results
matrix:
include:
- name: build-1
params:
- name: IMAGE
value: image-1
- name: DIGEST
value: path/to/Dockerfile1
- name: build-2
params:
- name: IMAGE
value: image-2
- name: DIGEST
value: path/to/Dockerfile2
- name: build-3
params:
- name: IMAGE
value: image-3
taskRef:
name: taskwithresults
kind: Task
- name: matrixed-echo-length
runAfter:
- matrix-emitting-results
params:
- name: matrixlength
value: $(tasks.matrix-emitting-results.matrix.length)
taskRef:
name: validate-matrix-result-length
kind: Task
- name: matrixed-echo-results-length
runAfter:
- matrix-emitting-results
params:
- name: matrixresultslength-1
value: $(tasks.matrix-emitting-results.matrix.IMAGE-DIGEST.length)
- name: matrixresultslength-2
value: $(tasks.matrix-emitting-results.matrix.IMAGE-URL.length)
taskRef:
name: validate-matrix-results-length
kind: Task
Original file line number Diff line number Diff line change
@@ -0,0 +1,110 @@
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: echostringurl
spec:
params:
- name: url
type: string
steps:
- name: echo
image: alpine
script: |
echo "$(params.url)"
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: validate-array-url
spec:
params:
- name: url
type: array
steps:
- name: validate
image: ubuntu
args: ["$(params.url[*])"]
script: |
#!/usr/bin/env bash
args=("$@")
URLS=( )
URLS[0]="https://api.example/get-report/linux-chrome"
URLS[1]="https://api.example/get-report/mac-chrome"
URLS[2]="https://api.example/get-report/windows-chrome"
URLS[3]="https://api.example/get-report/linux-safari"
URLS[4]="https://api.example/get-report/mac-safari"
URLS[5]="https://api.example/get-report/windows-safari"
URLS[6]="https://api.example/get-report/linux-firefox"
URLS[7]="https://api.example/get-report/mac-firefox"
URLS[8]="https://api.example/get-report/windows-firefox"
for i in "${!URLS[@]}"; do
if [ "${URLS[$i]}" != ${args[$i]} ]; then
echo "Error: expected url to be ${URLS[$i]}, but got ${args[$i]}"
exit 1
fi
echo "Done validating the url: ${args[$i]}"
done
---
apiVersion: tekton.dev/v1
kind: Task
metadata:
name: task-producing-results
spec:
params:
- name: platform
default: ""
- name: browser
default: ""
results:
- name: report-url
type: string
steps:
- name: produce-report-url
image: alpine
script: |
echo "Running tests on $(params.platform)-$(params.browser)"
echo -n "https://api.example/get-report/$(params.platform)-$(params.browser)" | tee $(results.report-url.path)
---
apiVersion: tekton.dev/v1
kind: PipelineRun
metadata:
generateName: platforms-with-results
spec:
taskRunTemplate:
serviceAccountName: "default"
pipelineSpec:
results:
- name: pr-result-1
value: $(tasks.matrix-emitting-results.results.report-url[*])
tasks:
- name: matrix-emitting-results
matrix:
params:
- name: platform
value:
- linux
- mac
- windows
- name: browser
value:
- chrome
- safari
- firefox
taskRef:
name: task-producing-results
kind: Task
- name: task-consuming-results
taskRef:
name: validate-array-url
kind: Task
params:
- name: url
value: $(tasks.matrix-emitting-results.results.report-url[*])
- name: matrix-consuming-results
taskRef:
name: echostringurl
kind: Task
matrix:
params:
- name: url
value: $(tasks.matrix-emitting-results.results.report-url[*])
23 changes: 23 additions & 0 deletions pkg/apis/pipeline/v1/param_types.go
Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,29 @@ func (ps Params) extractParamMapArrVals() map[string][]string {
return paramsMap
}

// ParseTaskandResultName parses "task name", "result name" from a Matrix Context Variable
// Valid Example 1:
// - Input: tasks.myTask.matrix.length
// - Output: "myTask", ""
// Valid Example 2:
// - Input: tasks.myTask.matrix.ResultName.length
// - Output: "myTask", "ResultName"
func (p Param) ParseTaskandResultName() (string, string) {
if expressions, ok := p.GetVarSubstitutionExpressions(); ok {
for _, expression := range expressions {
subExpressions := strings.Split(expression, ".")
pipelineTaskName := subExpressions[1]
if len(subExpressions) == 4 {
return pipelineTaskName, ""
} else if len(subExpressions) == 5 {
resultName := subExpressions[3]
return pipelineTaskName, resultName
}
}
}
return "", ""
}

// Params is a list of Param
type Params []Param

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