Add simple workflow documentation

7 files changed, 29 insertions, 4 deletions

diff --git a/codecov.yml b/codecov.yml
index 45fccc1d..43716f56 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -17,5 +17,7 @@ ignore:
   - "plugins/kv/boltdb/plugin_unit_test.go"
   - "plugins/kv/memcached/plugin_unit_test.go"
   - "plugins/kv/memory/plugin_unit_test.go"
+  - "pkg/events/pool_events.go"
+  - "pkg/events/worker_events.go"
   - "interfaces"
   - "systemd"
\ No newline at end of file
diff --git a/pkg/doc/README.md b/pkg/doc/README.md
new file mode 100644
index 00000000..4f726f4a
--- /dev/null
+++ b/pkg/doc/README.md
@@ -0,0 +1,21 @@
+This is the drawio diagrams showing basic workflows inside RoadRunner 2.0
+
+Simple HTTP workflow description:
+![alt text](pool_workflow.svg)  
+
+1. Allocate sync workers. When plugin starts (which use workers pool), then it allocates required number of processes
+   via `cmd.exec` command.
+    
+2. When user send HTTP request to the RR2, HTTP plugin receive it and transfer to the workers pool `Exec/ExecWithContex`
+method. And workers pool ask Worker watcher to get free worker.
+   
+3. Workers watcher uses stack data structure under the hood and making POP operation to get first free worker. If there are
+no workers in the `stack`, watcher waits for the specified via config (`allocate_timeout`) time.
+   
+4. Stack returns free worker to the watcher.
+5. Watcher returns that worker to the `pool`.
+6. Pool invoke `Exec/ExecWithTimeout` method on the golang worker with provided request payload.
+7. Golang worker send that request to the PHP worker via various set of transports (`pkg/transport` package).
+8. PHP worker send back response to the golang worker (or error via stderr).
+9. Golang worker return response payload to the pool.
+10. Pool process this response and return answer to the user.
\ No newline at end of file
diff --git a/pkg/doc/pool_workflow.drawio b/pkg/doc/pool_workflow.drawio
index eb8c6e2b..0cf6b735 100644
--- a/pkg/doc/pool_workflow.drawio
+++ b/pkg/doc/pool_workflow.drawio
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/pkg/doc/pool_workflow.svg b/pkg/doc/pool_workflow.svg
new file mode 100644
index 00000000..241d1f40
--- /dev/null
+++ b/pkg/doc/pool_workflow.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 616px; margin-left: 313px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">Give me sync worker (POP operation)</div></div></div></foreignObject><text x="313" y="620" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">Give me sync worker (POP operation)</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 617px; margin-left: 418px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">3</div></div></div></foreignObject><text x="418" y="620" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">3</text></switch></g><path d="M 492.5 514 L 492.5 430.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 492.5 425.12 L 496 432.12 L 492.5 430.37 L 489 432.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 464px; margin-left: 493px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">5</div></div></div></foreignObject><text x="493" y="468" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">5</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 465px; margin-left: 527px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">Get worker</div></div></div></foreignObject><text x="527" y="468" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">Get worker</text></switch></g><rect x="380" y="514" width="150" height="60" fill="#ffe6cc" stroke="#d79b00" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 148px; height: 1px; padding-top: 544px; margin-left: 381px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Workers Watcher</div></div></div></foreignObject><text x="455" y="548" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Workers Watcher</text></switch></g><path d="M 330 404 L 373.63 404" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 378.88 404 L 371.88 407.5 L 373.63 404 L 371.88 400.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><path d="M 280 424 L 280 544 L 373.63 544" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 378.88 544 L 371.88 547.5 L 373.63 544 L 371.88 540.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 515px; margin-left: 221px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">Allocate sync workers</div></div></div></foreignObject><text x="221" y="518" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">Allocate sync workers</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 514px; margin-left: 280px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">1</div></div></div></foreignObject><text x="280" y="518" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">1</text></switch></g><rect x="230" y="384" width="100" height="40" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 404px; margin-left: 231px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Initialize</div></div></div></foreignObject><text x="280" y="408" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Initialize</text></switch></g><path d="M 417.5 424 L 417.5 507.63" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 417.5 512.88 L 414 505.88 L 417.5 507.63 L 421 505.88 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 464px; margin-left: 358px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">Give me SyncWorker</div></div></div></foreignObject><text x="358" y="467" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">Give me SyncWorker</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 464px; margin-left: 418px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">2</div></div></div></foreignObject><text x="418" y="468" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">2</text></switch></g><path d="M 530 414 L 700.63 414" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 705.88 414 L 698.88 417.5 L 700.63 414 L 698.88 410.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 416px; margin-left: 627px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">6</div></div></div></foreignObject><text x="627" y="419" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">6</text></switch></g><path d="M 492.5 384 L 483 384 L 483 324 L 520 324 L 520 83 L 468.87 83" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 463.62 83 L 470.62 79.5 L 468.87 83 L 470.62 86.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 224px; margin-left: 521px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">10</div></div></div></foreignObject><text x="521" y="227" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">10</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 225px; margin-left: 597px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">Send response to the user</div></div></div></foreignObject><text x="597" y="228" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">Send response to the user</text></switch></g><rect x="380" y="384" width="150" height="40" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 148px; height: 1px; padding-top: 404px; margin-left: 381px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Exec/ExecWithContext</div></div></div></foreignObject><text x="455" y="408" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Exec/ExecWithContext</text></switch></g><path d="M 492.5 664 L 492.5 624 L 492.5 580.37" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 492.5 575.12 L 496 582.12 L 492.5 580.37 L 489 582.12 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 616px; margin-left: 494px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">4</div></div></div></foreignObject><text x="494" y="620" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">4</text></switch></g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 617px; margin-left: 582px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">I have free workers, here you are</div></div></div></foreignObject><text x="582" y="620" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">I have free workers, here you are</text></switch></g><rect x="380" y="664" width="150" height="60" fill="#d5e8d4" stroke="#82b366" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 148px; height: 1px; padding-top: 694px; margin-left: 381px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Stack with workers</div></div></div></foreignObject><text x="455" y="698" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Stack with workers</text></switch></g><path d="M 707 394 L 536.37 394" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 531.12 394 L 538.12 390.5 L 536.37 394 L 538.12 397.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 394px; margin-left: 627px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">9</div></div></div></foreignObject><text x="627" y="397" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">9</text></switch></g><rect x="707" y="384" width="163" height="40" fill="#dae8fc" stroke="#6c8ebf" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 161px; height: 1px; padding-top: 404px; margin-left: 708px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Exec/ExecWithTimeout</div></div></div></foreignObject><text x="789" y="408" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Exec/ExecWithTimeout</text></switch></g><path d="M 450 289.5 L 460 289.5 L 460 364.5 L 470.5 364.5 L 455 383.5 L 439.5 364.5 L 450 364.5 Z" fill="none" stroke="#000000" stroke-linejoin="round" stroke-miterlimit="10" pointer-events="all"/><ellipse cx="455" cy="84.5" rx="7.5" ry="7.5" fill="#ffffff" stroke="#000000" pointer-events="all"/><path d="M 455 92 L 455 117 M 455 97 L 440 97 M 455 97 L 470 97 M 455 117 L 440 137 M 455 117 L 470 137" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 144px; margin-left: 455px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">User request</div></div></div></foreignObject><text x="455" y="156" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">User...</text></switch></g><rect x="625" y="424" width="160" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 434px; margin-left: 705px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Send request to the worker</div></div></div></foreignObject><text x="705" y="438" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Send request to the worker</text></switch></g><rect x="625" y="366" width="110" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 376px; margin-left: 680px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Receive response</div></div></div></foreignObject><text x="680" y="380" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Receive response</text></switch></g><ellipse cx="125" cy="404" rx="11" ry="11" fill="#000000" stroke="#ff0000" pointer-events="all"/><path d="M 140 404 L 227.76 404" fill="none" stroke="#ff0000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 219.88 408.5 L 228.88 404 L 219.88 399.5" fill="none" stroke="#ff0000" stroke-miterlimit="10" pointer-events="all"/><rect x="70" y="369" width="110" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 379px; margin-left: 125px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Plugin Initialization</div></div></div></foreignObject><text x="125" y="383" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Plugin Initializat...</text></switch></g><path d="M 870 414 L 983.63 414" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 988.88 414 L 981.88 417.5 L 983.63 414 L 981.88 410.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 415px; margin-left: 911px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">7</div></div></div></foreignObject><text x="911" y="418" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">7</text></switch></g><path d="M 990 394 L 876.37 394" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 871.12 394 L 878.12 390.5 L 876.37 394 L 878.12 397.5 Z" fill="#000000" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 395px; margin-left: 910px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">8</div></div></div></foreignObject><text x="910" y="398" fill="#000000" font-family="Verdana" font-size="11px" text-anchor="middle">8</text></switch></g><rect x="990" y="384" width="100" height="40" fill="#f5f5f5" stroke="#666666" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 404px; margin-left: 991px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #333333; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Worker</div></div></div></foreignObject><text x="1040" y="408" fill="#333333" font-family="Verdana" font-size="12px" text-anchor="middle">Worker</text></switch></g><rect x="895" y="424" width="90" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 434px; margin-left: 940px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Exec payload</div></div></div></foreignObject><text x="940" y="438" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Exec payload</text></switch></g><rect x="880" y="364" width="110" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 374px; margin-left: 935px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: nowrap; ">Reveive response</div></div></div></foreignObject><text x="935" y="378" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Reveive response</text></switch></g><rect x="401" y="255" width="108" height="34" fill="#f8cecc" stroke="#b85450" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 106px; height: 1px; padding-top: 272px; margin-left: 402px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">HTTP plugin</div></div></div></foreignObject><text x="455" y="276" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">HTTP plugin</text></switch></g><path d="M 450 157.5 L 460 157.5 L 460 235.5 L 470.5 235.5 L 455 254.5 L 439.5 235.5 L 450 235.5 Z" fill="none" stroke="#000000" stroke-linejoin="round" stroke-miterlimit="10" pointer-events="all"/><rect x="490" y="364" width="40" height="20" fill="none" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 38px; height: 1px; padding-top: 374px; margin-left: 491px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Pool</div></div></div></foreignObject><text x="510" y="378" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Pool</text></switch></g><rect x="770" y="364" width="100" height="20" fill="none" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 374px; margin-left: 771px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Golang Worker</div></div></div></foreignObject><text x="820" y="378" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">Golang Worker</text></switch></g><rect x="1020" y="364" width="70" height="20" fill="none" stroke="#000000" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 68px; height: 1px; padding-top: 374px; margin-left: 1021px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Verdana; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">PHP worker</div></div></div></foreignObject><text x="1055" y="378" fill="#000000" font-family="Verdana" font-size="12px" text-anchor="middle">PHP worker</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Viewer does not support full SVG 1.1</text></a></switch></svg>
\ No newline at end of file
diff --git a/pkg/doc/workflow.drawio b/pkg/doc/workflow.drawio
deleted file mode 100644
index d32d7b2d..00000000
--- a/pkg/doc/workflow.drawio
+++ /dev/null
@@ -1 +0,0 @@
-<mxfile host="Electron" modified="2021-01-23T19:13:52.763Z" agent="5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/14.1.8 Chrome/87.0.4280.141 Electron/11.2.1 Safari/537.36" etag="OK65Xj3LZBjWN0qK7Y8T" version="14.1.8" type="device"><diagram id="8w40hpb1-UDYxj1ewOsN" name="Page-1">jZJNT4QwEIZ/TY8mQCWy10XUxJiNclg9NnSWNimUdIuAv95iW6Ahm8iBzDzz0enbQThvxmdFOvYmKQiURHRE+BElySHOzH8GkwUZxhbUilOL4hWU/AccjBztOYVrkKilFJp3Iaxk20KlA0aUkkOYdpEiPLUjNexAWRGxp2dONfPTmW+NvACvmd6FGuLzHbgyQuWwQbhAOFdSams1Yw5ils9LY+uebkSX2RS0+j8FnylJH75O9cdrkZ3O6XF8Z5c71+WbiN7d2Q2rJy+Ckn1LYW4SIXwcGNdQdqSao4N5dcOYboTxYmO6dqA0jDfnjJfbm8UB2YBWk0nxBV4wtzQH5w7BC1jGNtrfO0bco9dL51UUYzhdvLvq/xfb7DEufgE=</diagram></mxfile>
\ No newline at end of file
diff --git a/pkg/events/pool_events.go b/pkg/events/pool_events.go
index 2cc76eee..3925df56 100644
--- a/pkg/events/pool_events.go
+++ b/pkg/events/pool_events.go
@@ -3,7 +3,7 @@ package events
 // TODO event numbers
 const (
 	// EventWorkerConstruct thrown when new worker is spawned.
-	EventWorkerConstruct P = iota + 7800
+	EventWorkerConstruct P = iota + 10000
 
 	// EventWorkerDestruct thrown after worker destruction.
 	EventWorkerDestruct
diff --git a/pkg/events/worker_events.go b/pkg/events/worker_events.go
index 2bff1811..9d428f7d 100644
--- a/pkg/events/worker_events.go
+++ b/pkg/events/worker_events.go
@@ -2,7 +2,7 @@ package events
 
 const (
 	// EventWorkerError triggered after WorkerProcess. Except payload to be error.
-	EventWorkerError W = iota + 200
+	EventWorkerError W = iota + 11000
 
 	// EventWorkerLog triggered on every write to WorkerProcess StdErr pipe (batched). Except payload to be []byte string.
 	EventWorkerLog