f-21: vpc: change to be ok in the name

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

.forgejo/workflows/prerelease.yml

@@ -37,7 +37,6 @@ jobs:
           - metadata
           - metacli
           - agent
-          - vpc
           - dhcp
           - subnet
     uses: ./.forgejo/workflows/build.yml

.gitignore

@@ -15,6 +15,9 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+# Output of the go coverage tool, specifically when used with LiteIDE
+.claude
+
 # Dependency directories (remove the comment below to include it)
 # vendor/
 

LICENSE

@@ -1,170 +1,131 @@
-Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
+# PolyForm Noncommercial License 1.0.0
 
- Creative Commons Corporation (“Creative Commons”) is not a law firm and does not provide legal services or legal advice. Distribution of Creative Commons public licenses does not create a lawyer-client or other relationship. Creative Commons makes its licenses and related information available on an “as-is” basis. Creative Commons gives no warranties regarding its licenses, any material licensed under their terms and conditions, or any related information. Creative Commons disclaims all liability for damages resulting from their use to the fullest extent possible.
+<https://polyformproject.org/licenses/noncommercial/1.0.0>
 
-Using Creative Commons Public Licenses
+## Acceptance
 
-Creative Commons public licenses provide a standard set of terms and conditions that creators and other rights holders may use to share original works of authorship and other material subject to copyright and certain other rights specified in the public license below. The following considerations are for informational purposes only, are not exhaustive, and do not form part of our licenses.
+In order to get any license under these terms, you must agree
+to them as both strict obligations and conditions to all
+your licenses.
 
-Considerations for licensors: Our public licenses are intended for use by those authorized to give the public permission to use material in ways otherwise restricted by copyright and certain other rights. Our licenses are irrevocable. Licensors should read and understand the terms and conditions of the license they choose before applying it. Licensors should also secure all rights necessary before applying our licenses so that the public can reuse the material as expected. Licensors should clearly mark any material not subject to the license. This includes other CC-licensed material, or material used under an exception or limitation to copyright. More considerations for licensors.
+## Copyright License
 
-Considerations for the public: By using one of our public licenses, a licensor grants the public permission to use the licensed material under specified terms and conditions. If the licensor’s permission is not necessary for any reason–for example, because of any applicable exception or limitation to copyright–then that use is not regulated by the license. Our licenses grant only permissions under copyright and certain other rights that a licensor has authority to grant. Use of the licensed material may still be restricted for other reasons, including because others have copyright or other rights in the material. A licensor may make special requests, such as asking that all changes be marked or described. Although not required by our licenses, you are encouraged to respect those requests where reasonable. More considerations for the public.
+The licensor grants you a copyright license for the
+software to do everything you might do with the software
+that would otherwise infringe the licensor's copyright
+in it for any permitted purpose.  However, you may
+only distribute the software according to [Distribution
+License](#distribution-license) and make changes or new works
+based on the software according to [Changes and New Works
+License](#changes-and-new-works-license).
 
-Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License
+## Distribution License
 
-By exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License ("Public License"). To the extent this Public License may be interpreted as a contract, You are granted the Licensed Rights in consideration of Your acceptance of these terms and conditions, and the Licensor grants You such rights in consideration of benefits the Licensor receives from making the Licensed Material available under these terms and conditions.
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+changes and new works permitted by [Changes and New Works
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+software under these terms.
 
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+**Use** means anything you do with the software requiring one
+of your licenses.

api/agent.yaml

@@ -0,0 +1,303 @@
+openapi: "3.1.0"
+info:
+  title: Two API
+  version: "0.1.0"
+  description: REST API for managing VPCs and Subnets in the Two orchestrator.
+
+servers:
+  - url: http://localhost:8080
+    description: Local development server
+
+paths:
+
+  # ── VPC ────────────────────────────────────────────────────────────────────
+
+  /vpcs:
+    get:
+      summary: List all VPCs
+      operationId: listVPCs
+      responses:
+        "200":
+          description: List of VPCs
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/VPC"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+    post:
+      summary: Create a VPC
+      operationId: createVPC
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/VPCCreateRequest"
+      responses:
+        "202":
+          description: VPC creation accepted
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/VPC"
+        "409":
+          description: VPC already exists
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+  /vpcs/{name}:
+    parameters:
+      - $ref: "#/components/parameters/ResourceName"
+
+    get:
+      summary: Get VPC status and info
+      operationId: getVPC
+      responses:
+        "200":
+          description: VPC found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/VPC"
+        "404":
+          $ref: "#/components/responses/NotFound"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+    delete:
+      summary: Delete a VPC
+      operationId: deleteVPC
+      responses:
+        "202":
+          description: VPC deletion accepted
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/VPC"
+        "404":
+          $ref: "#/components/responses/NotFound"
+        "409":
+          description: VPC not in a deletable state
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+  # ── Subnet ─────────────────────────────────────────────────────────────────
+
+  /subnets:
+    get:
+      summary: List all subnets
+      operationId: listSubnets
+      responses:
+        "200":
+          description: List of subnets
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/Subnet"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+    post:
+      summary: Create a subnet
+      operationId: createSubnet
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/SubnetCreateRequest"
+      responses:
+        "202":
+          description: Subnet creation accepted
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Subnet"
+        "400":
+          description: Missing required field or unknown iface_type
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "409":
+          description: Subnet already exists
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "422":
+          description: Parent VPC does not exist or is not ready
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+  /subnets/{name}:
+    parameters:
+      - $ref: "#/components/parameters/ResourceName"
+
+    get:
+      summary: Get subnet status and info
+      operationId: getSubnet
+      responses:
+        "200":
+          description: Subnet found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Subnet"
+        "404":
+          $ref: "#/components/responses/NotFound"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+    delete:
+      summary: Delete a subnet
+      operationId: deleteSubnet
+      responses:
+        "202":
+          description: Subnet deletion accepted
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Subnet"
+        "404":
+          $ref: "#/components/responses/NotFound"
+        "409":
+          description: Subnet not in a deletable state
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
+        "500":
+          $ref: "#/components/responses/InternalError"
+
+# ── Components ──────────────────────────────────────────────────────────────
+
+components:
+
+  parameters:
+    ResourceName:
+      name: name
+      in: path
+      required: true
+      schema:
+        type: string
+      description: Resource name
+
+  schemas:
+
+    VPCCreateRequest:
+      type: object
+      required: [name]
+      properties:
+        name:
+          type: string
+          description: Unique name for the VPC, must follow the format vp-[id]
+          pattern: '^vp-.+'
+          example: vp-00001
+
+    VPC:
+      type: object
+      properties:
+        name:
+          type: string
+          example: vp-00001
+        state:
+          type: string
+          enum: [creating, created, deleting, deleted]
+          example: created
+
+    SubnetCreateRequest:
+      type: object
+      required: [name, vpc, vxlan_id, gateway_ip, cidr]
+      properties:
+        name:
+          type: string
+          description: Unique name for the subnet
+          example: sn-00001
+        vpc:
+          type: string
+          description: Parent VPC name
+          example: vpc1
+        vxlan_id:
+          type: integer
+          description: VXLAN VNI identifier
+          example: 100
+        iface_type:
+          type: string
+          description: Interface type key defined in the agent config (e.g. vms, internet, admin). Falls back to default_interface if omitted or unknown.
+          example: vms
+        gateway_ip:
+          type: string
+          format: ipv4
+          description: Gateway IP for the subnet
+          example: "10.10.10.1"
+        cidr:
+          type: string
+          description: Subnet CIDR block
+          example: "10.10.10.0/24"
+
+    Subnet:
+      type: object
+      properties:
+        name:
+          type: string
+          example: sn-00001
+        state:
+          type: string
+          enum: [creating, created, deleting, deleted]
+          example: created
+        vpc:
+          type: string
+          example: vpc1
+        vxlan_id:
+          type: integer
+          example: 100
+        local_iface:
+          type: string
+          description: Resolved interface name
+          example: br-000000
+        gateway_ip:
+          type: string
+          example: "10.10.10.1"
+        cidr:
+          type: string
+          example: "10.10.10.0/24"
+
+    Error:
+      type: object
+      properties:
+        error:
+          type: string
+          example: "resource not found"
+
+  responses:
+    NotFound:
+      description: Resource not found
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Error"
+    InternalError:
+      description: Internal server error
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Error"

cmd/agent/main.go

@@ -1,17 +1,44 @@
 package main
 
 import (
+	"flag"
 	"fmt"
-	"os"
-)
+	"log"
 
-var (
-	bin_name = os.Args[0]
+	agentapi "git.g3e.fr/syonad/two/internal/api/agent"
+	configuration "git.g3e.fr/syonad/two/internal/config/agent"
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+	agentmetrics "git.g3e.fr/syonad/two/internal/prometheus/agent"
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+	promserver "git.g3e.fr/syonad/two/pkg/prometheus"
+	"git.g3e.fr/syonad/two/pkg/worker"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 func main() {
+	confFile := flag.String("config", "/etc/two/agent.yml", "config file path")
+	flag.Parse()
 
-	fmt.Printf("%s: Start process\n", bin_name)
-
-	os.Exit(0)
+	cfg, err := configuration.LoadConfig(*confFile)
+	if err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	db := kv.InitDB(kv.Config{Path: cfg.Database.Path}, false)
+	defer db.Close()
+
+	q := worker.New(cfg.Worker.BufferSize)
+	q.Start(cfg.Worker.Count)
+
+	registry := prometheus.NewRegistry()
+	registry.MustRegister(agentmetrics.NewAgentCollector(db))
+
+	apiAddr := fmt.Sprintf("%s:%d", cfg.Api.Address, cfg.Api.Port)
+	promAddr := fmt.Sprintf("%s:%d", cfg.Prometheus.Address, cfg.Prometheus.Port)
+
+	d := dispatcher.New(q, db, cfg)
+	go agentapi.New(d, db).Start(apiAddr)
+	go promserver.Start(promAddr, registry)
+
+	select {}
 }

cmd/vpc/main.go

@@ -1,65 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-	"os"
-
-	configuration "git.g3e.fr/syonad/two/internal/config/agent"
-	"git.g3e.fr/syonad/two/internal/vpc"
-	"git.g3e.fr/syonad/two/pkg/db/kv"
-	"github.com/dgraph-io/badger/v4"
-)
-
-var (
-	netns     = flag.String("netns", "", "Network namespace à faire")
-	name      = flag.String("name", "", "interface name")
-	action    = flag.String("action", "", "Action a faire")
-	conf_file = flag.String("conf", "/etc/two/agent.yml", "configuration file")
-)
-
-var DB *badger.DB
-
-func main() {
-	flag.Parse()
-
-	conf, err := configuration.LoadConfig(*conf_file)
-	if err != nil {
-		fmt.Println(err)
-		return
-	}
-
-	DB = kv.InitDB(kv.Config{
-		Path: conf.Database.Path,
-	}, false)
-	defer DB.Close()
-
-	switch *action {
-	case "create":
-		kv.AddInDB(DB, "vpc/"+*name+"/state", "creating")
-		if err := vpc.CreateVPC(DB, *name); err != nil {
-			fmt.Println(err)
-		}
-	case "delete":
-		kv.AddInDB(DB, "vpc/"+*name+"/state", "deleting")
-		if err := vpc.DeleteVPC(DB, *name); err != nil {
-			fmt.Println(err)
-		}
-		if state, err := kv.GetFromDB(DB, "vpc/"+*name+"/state"); err != nil {
-			fmt.Println(err)
-			os.Exit(1)
-		} else if state == "deleted" {
-			kv.DeleteInDB(DB, "vpc/"+*name)
-		}
-	case "check":
-		if state, err := kv.GetFromDB(DB, "vpc/"+*name+"/state"); err != nil {
-			os.Exit(1)
-		} else if state != "created" {
-			os.Exit(1)
-		}
-	default:
-		fmt.Printf("Available commande:\n - create\n - delete\n - check\n")
-		os.Exit(1)
-	}
-	os.Exit(0)
-}

conf/agent/config.exemple.yml

@@ -1,2 +1,9 @@
 database:
   path: "/var/lib/two/data/"
+
+default_interface: br-000000
+
+interfaces:
+  vms: br-000000
+  internet: br-000000
+  admin: br-000000

go.mod

@@ -5,6 +5,7 @@ go 1.24.0
 toolchain go1.24.11
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.6.0 // indirect
 	github.com/dgraph-io/badger/v4 v4.8.0 // indirect
@@ -17,7 +18,12 @@ require (
 	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/google/flatbuffers v25.2.10+incompatible // indirect
 	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/prometheus/client_golang v1.23.2 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/sagikazarmark/locafero v0.11.0 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
@@ -31,9 +37,10 @@ require (
 	go.opentelemetry.io/otel v1.37.0 // indirect
 	go.opentelemetry.io/otel/metric v1.37.0 // indirect
 	go.opentelemetry.io/otel/trace v1.37.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/net v0.43.0 // indirect
 	golang.org/x/sys v0.39.0 // indirect
 	golang.org/x/text v0.28.0 // indirect
-	google.golang.org/protobuf v1.36.6 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/coreos/go-systemd/v22 v22.6.0 h1:aGVa/v8B7hpb0TKl0MWoAavPDmHvobFe5R5zn0bCJWo=
@@ -23,8 +25,18 @@ github.com/google/flatbuffers v25.2.10+incompatible h1:F3vclr7C3HpB1k9mxCGRMXq6F
 github.com/google/flatbuffers v25.2.10+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
 github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
 github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
 github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
+github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
+github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
+github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
+github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
+github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9ZoGs=
+github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
+github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
+github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
 github.com/sagikazarmark/locafero v0.11.0 h1:1iurJgmM9G3PA/I+wWYIOw/5SyBtxapeHDcg+AAIFXc=
 github.com/sagikazarmark/locafero v0.11.0/go.mod h1:nVIGvgyzw595SUSUE6tvCp3YYTeHs15MvlmU87WwIik=
 github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 h1:+jumHNA0Wrelhe64i8F6HNlS8pkoyMv5sreGx2Ry5Rw=
@@ -51,10 +63,14 @@ go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/Wgbsd
 go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
 go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
 go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
+go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
+go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
 golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
+golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
+golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
 golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
@@ -65,4 +81,6 @@ golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
 golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
 google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
 google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
+google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
+google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/api/agent/models.go

@@ -0,0 +1,33 @@
+package agentapi
+
+type VPCCreateRequest struct {
+	Name string `json:"name"`
+}
+
+type VPC struct {
+	Name  string `json:"name"`
+	State string `json:"state"`
+}
+
+type SubnetCreateRequest struct {
+	Name      string `json:"name"`
+	VPC       string `json:"vpc"`
+	VxlanID   int    `json:"vxlan_id"`
+	IfaceType string `json:"iface_type"`
+	GatewayIP string `json:"gateway_ip"`
+	CIDR      string `json:"cidr"`
+}
+
+type Subnet struct {
+	Name       string `json:"name"`
+	State      string `json:"state"`
+	VPC        string `json:"vpc"`
+	VxlanID    int    `json:"vxlan_id"`
+	LocalIface string `json:"local_iface"`
+	GatewayIP  string `json:"gateway_ip"`
+	CIDR       string `json:"cidr"`
+}
+
+type ErrorResponse struct {
+	Error string `json:"error"`
+}

internal/api/agent/server.go

@@ -0,0 +1,35 @@
+package agentapi
+
+import (
+	"log"
+	"net/http"
+
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+	"github.com/dgraph-io/badger/v4"
+)
+
+type Server struct {
+	dispatcher *dispatcher.Dispatcher
+	db         *badger.DB
+}
+
+func New(d *dispatcher.Dispatcher, db *badger.DB) *Server {
+	return &Server{dispatcher: d, db: db}
+}
+
+func (s *Server) Start(address string) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/vpcs", s.VpcsHandler)
+	mux.HandleFunc("/vpcs/", s.VpcByNameHandler)
+	mux.HandleFunc("/subnets", s.SubnetsHandler)
+	mux.HandleFunc("/subnets/", s.SubnetByNameHandler)
+	log.Printf("API server listening on %s", address)
+	log.Fatal(http.ListenAndServe(address, logMiddleware(mux)))
+}
+
+func logMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%s %s %s", r.RemoteAddr, r.Method, r.URL.Path)
+		next.ServeHTTP(w, r)
+	})
+}

internal/api/agent/subnet.go

@@ -0,0 +1,40 @@
+package agentapi
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+)
+
+func (s *Server) SubnetByNameHandler(w http.ResponseWriter, r *http.Request) {
+	name := strings.TrimPrefix(r.URL.Path, "/subnets/")
+	if name == "" {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNotFound)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "resource not found"})
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	switch r.Method {
+	case http.MethodGet:
+		s.getSubnet(w, r, name)
+	case http.MethodDelete:
+		s.deleteSubnet(w, r, name)
+	default:
+		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) getSubnet(w http.ResponseWriter, r *http.Request, name string) {
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(Subnet{Name: name, State: "created"})
+}
+
+func (s *Server) deleteSubnet(w http.ResponseWriter, r *http.Request, name string) {
+	s.dispatcher.Dispatch(dispatcher.DeleteSubnetCommand{Name: name})
+	w.WriteHeader(http.StatusAccepted)
+	json.NewEncoder(w).Encode(Subnet{Name: name, State: "deleting"})
+}
+

internal/api/agent/subnets.go

@@ -0,0 +1,56 @@
+package agentapi
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+)
+
+func (s *Server) SubnetsHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	switch r.Method {
+	case http.MethodGet:
+		s.listSubnets(w, r)
+	case http.MethodPost:
+		s.postSubnet(w, r)
+	default:
+		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) listSubnets(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode([]Subnet{})
+}
+
+func (s *Server) postSubnet(w http.ResponseWriter, r *http.Request) {
+	var req SubnetCreateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "invalid request body"})
+		return
+	}
+	if req.Name == "" || req.VPC == "" || req.IfaceType == "" || req.GatewayIP == "" || req.CIDR == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "name, vpc, iface_type, gateway_ip and cidr are required"})
+		return
+	}
+	s.dispatcher.Dispatch(dispatcher.CreateSubnetCommand{
+		Name:      req.Name,
+		VPC:       req.VPC,
+		VxlanID:   req.VxlanID,
+		IfaceType: req.IfaceType,
+		GatewayIP: req.GatewayIP,
+		CIDR:      req.CIDR,
+	})
+	w.WriteHeader(http.StatusAccepted)
+	json.NewEncoder(w).Encode(Subnet{
+		Name:      req.Name,
+		State:     "creating",
+		VPC:       req.VPC,
+		VxlanID:   req.VxlanID,
+		GatewayIP: req.GatewayIP,
+		CIDR:      req.CIDR,
+	})
+}

internal/api/agent/vpc.go

@@ -0,0 +1,40 @@
+package agentapi
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+)
+
+func (s *Server) VpcByNameHandler(w http.ResponseWriter, r *http.Request) {
+	name := strings.TrimPrefix(r.URL.Path, "/vpcs/")
+	if name == "" {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusNotFound)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "resource not found"})
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	switch r.Method {
+	case http.MethodGet:
+		s.getVpc(w, r, name)
+	case http.MethodDelete:
+		s.deleteVpc(w, r, name)
+	default:
+		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) getVpc(w http.ResponseWriter, _ *http.Request, name string) {
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(VPC{Name: name, State: "created"})
+}
+
+func (s *Server) deleteVpc(w http.ResponseWriter, _ *http.Request, name string) {
+	s.dispatcher.Dispatch(dispatcher.DeleteVPCCommand{Name: name})
+	w.WriteHeader(http.StatusAccepted)
+	json.NewEncoder(w).Encode(VPC{Name: name, State: "deleting"})
+}
+

internal/api/agent/vpcs.go

@@ -0,0 +1,42 @@
+package agentapi
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"git.g3e.fr/syonad/two/internal/dispatcher"
+)
+
+func (s *Server) VpcsHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	switch r.Method {
+	case http.MethodGet:
+		s.listVpcs(w, r)
+	case http.MethodPost:
+		s.postVpc(w, r)
+	default:
+		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) listVpcs(w http.ResponseWriter, _ *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode([]VPC{})
+}
+
+func (s *Server) postVpc(w http.ResponseWriter, r *http.Request) {
+	var req VPCCreateRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "invalid request body"})
+		return
+	}
+	if req.Name == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Error: "name is required"})
+		return
+	}
+	s.dispatcher.Dispatch(dispatcher.CreateVPCCommand{Name: req.Name})
+	w.WriteHeader(http.StatusAccepted)
+	json.NewEncoder(w).Encode(VPC{Name: req.Name, State: "creating"})
+}

internal/config/agent/struct.go

@@ -8,6 +8,20 @@ type Config struct {
 	Database struct {
 		Path string `mapstructure:"path"`
 	} `mapstructure:"database"`
+	Api struct {
+		Address string `mapstructure:"address"`
+		Port    int    `mapstructure:"port"`
+	} `mapstructure:"api"`
+	Prometheus struct {
+		Address string `mapstructure:"address"`
+		Port    int    `mapstructure:"port"`
+	} `mapstructure:"prometheus"`
+	Worker struct {
+		Count      int `mapstructure:"count"`
+		BufferSize int `mapstructure:"buffer_size"`
+	} `mapstructure:"worker"`
+	DefaultInterface string            `mapstructure:"default_interface"`
+	Interfaces       map[string]string `mapstructure:"interfaces"`
 }
 
 func LoadConfig(path string) (*Config, error) {
@@ -16,6 +30,13 @@ func LoadConfig(path string) (*Config, error) {
 	v.SetConfigType("yaml")
 
 	v.SetDefault("database.path", "/var/lib/two/data/")
+	v.SetDefault("api.address", "")
+	v.SetDefault("api.port", 8080)
+	v.SetDefault("prometheus.address", "")
+	v.SetDefault("prometheus.port", 9090)
+	v.SetDefault("worker.count", 4)
+	v.SetDefault("worker.buffer_size", 100)
+	v.SetDefault("default_interface", "br-000000")
 
 	v.ReadInConfig()
 

internal/dispatcher/dispatcher.go

@@ -0,0 +1,31 @@
+package dispatcher
+
+import (
+	"log"
+
+	configuration "git.g3e.fr/syonad/two/internal/config/agent"
+	"git.g3e.fr/syonad/two/pkg/worker"
+	"github.com/dgraph-io/badger/v4"
+)
+
+type Command interface {
+	Execute(db *badger.DB, cfg *configuration.Config) error
+}
+
+type Dispatcher struct {
+	queue *worker.Queue
+	db    *badger.DB
+	cfg   *configuration.Config
+}
+
+func New(queue *worker.Queue, db *badger.DB, cfg *configuration.Config) *Dispatcher {
+	return &Dispatcher{queue: queue, db: db, cfg: cfg}
+}
+
+func (d *Dispatcher) Dispatch(cmd Command) {
+	d.queue.Submit(func() {
+		if err := cmd.Execute(d.db, d.cfg); err != nil {
+			log.Printf("command error (%T): %v", cmd, err)
+		}
+	})
+}

internal/dispatcher/subnet_commands.go

@@ -0,0 +1,54 @@
+package dispatcher
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	configuration "git.g3e.fr/syonad/two/internal/config/agent"
+	"git.g3e.fr/syonad/two/internal/subnet"
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+	"github.com/dgraph-io/badger/v4"
+)
+
+type CreateSubnetCommand struct {
+	Name      string
+	VPC       string
+	VxlanID   int
+	IfaceType string
+	GatewayIP string
+	CIDR      string
+}
+
+func (c CreateSubnetCommand) Execute(db *badger.DB, cfg *configuration.Config) error {
+	localIface, ok := cfg.Interfaces[c.IfaceType]
+	if !ok {
+		localIface = cfg.DefaultInterface
+	}
+	kv.AddInDB(db, "subnet/"+c.Name+"/state", "creating")
+	kv.AddInDB(db, "subnet/"+c.Name+"/vpc", c.VPC)
+	kv.AddInDB(db, "subnet/"+c.Name+"/vxlan_id", strconv.Itoa(c.VxlanID))
+	kv.AddInDB(db, "subnet/"+c.Name+"/local_iface", localIface)
+	kv.AddInDB(db, "subnet/"+c.Name+"/gateway_ip", c.GatewayIP)
+	kv.AddInDB(db, "subnet/"+c.Name+"/cidr", c.CIDR)
+	return subnet.CreateSubnet(db, c.Name)
+}
+
+type DeleteSubnetCommand struct {
+	Name string
+}
+
+func (c DeleteSubnetCommand) Execute(db *badger.DB, _ *configuration.Config) error {
+	kv.AddInDB(db, "subnet/"+c.Name+"/state", "deleting")
+	if err := subnet.DeleteSubnet(db, c.Name); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	if state, err := kv.GetFromDB(db, "subnet/"+c.Name+"/state"); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	} else if state == "deleted" {
+		kv.DeleteInDB(db, "subnet/"+c.Name)
+	}
+	return nil
+}

internal/dispatcher/vpc_commands.go

@@ -0,0 +1,36 @@
+package dispatcher
+
+import (
+	configuration "git.g3e.fr/syonad/two/internal/config/agent"
+	"git.g3e.fr/syonad/two/internal/vpc"
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+	"github.com/dgraph-io/badger/v4"
+)
+
+type CreateVPCCommand struct {
+	Name string
+}
+
+func (c CreateVPCCommand) Execute(db *badger.DB, _ *configuration.Config) error {
+	kv.AddInDB(db, "vpc/"+c.Name+"/state", "creating")
+	return vpc.CreateVPC(db, c.Name)
+}
+
+type DeleteVPCCommand struct {
+	Name string
+}
+
+func (c DeleteVPCCommand) Execute(db *badger.DB, _ *configuration.Config) error {
+	kv.AddInDB(db, "vpc/"+c.Name+"/state", "deleting")
+	if err := vpc.DeleteVPC(db, c.Name); err != nil {
+		return err
+	}
+	state, err := kv.GetFromDB(db, "vpc/"+c.Name+"/state")
+	if err != nil {
+		return err
+	}
+	if state == "deleted" {
+		kv.DeleteInDB(db, "vpc/"+c.Name)
+	}
+	return nil
+}

internal/netif/vxlan.go

@@ -1,19 +1,21 @@
 package netif
 
 import (
-	"net"
-
 	"github.com/vishvananda/netlink"
 )
 
-func CreateVxlan(name string, vxlanID int, localIP net.IP) error {
+func CreateVxlan(name string, vxlanID int, localIface string) error {
+	link, err := netlink.LinkByName(localIface)
+	if err != nil {
+		return err
+	}
 	vxlan := &netlink.Vxlan{
 		LinkAttrs: netlink.LinkAttrs{
 			Name: name,
 		},
 		VxlanId:      vxlanID,
 		Port:         4789,
-		SrcAddr:  localIP,
+		VtepDevIndex: link.Attrs().Index,
 		Learning:     false,
 	}
 	return netlink.LinkAdd(vxlan)

internal/prometheus/agent/collector.go

@@ -0,0 +1,67 @@
+package agentmetrics
+
+import (
+	"strings"
+
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+	"github.com/dgraph-io/badger/v4"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var allStates = []string{"creating", "created", "deleting", "deleted"}
+
+// AgentCollector implements prometheus.Collector and exposes agent metrics
+// by querying the BadgerDB on each scrape.
+type AgentCollector struct {
+	db           *badger.DB
+	vpcsTotal    *prometheus.Desc
+	subnetsTotal *prometheus.Desc
+}
+
+func NewAgentCollector(db *badger.DB) *AgentCollector {
+	return &AgentCollector{
+		db: db,
+		vpcsTotal: prometheus.NewDesc(
+			"syonad_vpcs_total",
+			"Number of VPCs by state.",
+			[]string{"state"}, nil,
+		),
+		subnetsTotal: prometheus.NewDesc(
+			"syonad_subnets_total",
+			"Number of subnets by state.",
+			[]string{"state"}, nil,
+		),
+	}
+}
+
+func (c *AgentCollector) Describe(ch chan<- *prometheus.Desc) {
+	ch <- c.vpcsTotal
+	ch <- c.subnetsTotal
+}
+
+func (c *AgentCollector) Collect(ch chan<- prometheus.Metric) {
+	c.collectStates(ch, "vpc/", c.vpcsTotal)
+	c.collectStates(ch, "subnet/", c.subnetsTotal)
+}
+
+// collectStates counts resources under the given DB prefix by their state value
+// and emits one gauge per state label.
+func (c *AgentCollector) collectStates(ch chan<- prometheus.Metric, prefix string, desc *prometheus.Desc) {
+	counts := make(map[string]float64, len(allStates))
+	for _, s := range allStates {
+		counts[s] = 0
+	}
+
+	items, err := kv.ListByPrefix(c.db, prefix)
+	if err == nil {
+		for key, val := range items {
+			if strings.HasSuffix(key, "/state") {
+				counts[val]++
+			}
+		}
+	}
+
+	for _, state := range allStates {
+		ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, counts[state], state)
+	}
+}

internal/subnet/create.go

@@ -40,13 +40,9 @@ func CreateSubnet(db *badger.DB, subnetName string) error {
 		return fmt.Errorf("parse vxlan_id: %w", err)
 	}
 
-	localIPStr, err := kv.GetFromDB(db, "subnet/"+subnetName+"/local_ip")
+	localIface, err := kv.GetFromDB(db, "subnet/"+subnetName+"/local_iface")
 	if err != nil {
-		return fmt.Errorf("get local_ip: %w", err)
-	}
-	localIP := net.ParseIP(localIPStr)
-	if localIP == nil {
-		return fmt.Errorf("invalid local_ip: %s", localIPStr)
+		return fmt.Errorf("get local_iface: %w", err)
 	}
 
 	gatewayIPStr, err := kv.GetFromDB(db, "subnet/"+subnetName+"/gateway_ip")
@@ -90,7 +86,7 @@ func CreateSubnet(db *badger.DB, subnetName string) error {
 	}
 
 	// vxlan
-	if err := netif.CreateVxlan(vxlanIface, vxlanID, localIP); err != nil {
+	if err := netif.CreateVxlan(vxlanIface, vxlanID, localIface); err != nil {
 		return fmt.Errorf("create vxlan: %w", err)
 	}
 

internal/vpc/create.go

@@ -1,6 +1,8 @@
 package vpc
 
 import (
+	"strings"
+
 	"git.g3e.fr/syonad/two/internal/netif"
 	"git.g3e.fr/syonad/two/internal/netns"
 	"git.g3e.fr/syonad/two/pkg/db/kv"
@@ -9,49 +11,40 @@ import (
 )
 
 func CreateVPC(db *badger.DB, name string) error {
-	// missing
-	// search data in db
-	//  change state in db
-
-	// create netns
 	if state, err := kv.GetFromDB(db, "vpc/"+name+"/state"); err != nil {
 		return err
 	} else if state == "creating" {
+		vpcID := strings.SplitN(name, "-", 2)[1]
+
 		if err := netns.Create(name); err != nil {
 			return err
 		}
 
-		// create veth public for this netns
-		if err := netif.CreateVethToNetns("vp-"+name+"-e", "vp-public-i", "/var/run/netns/"+name, 9000); err != nil {
+		if err := netif.CreateVethToNetns("vp-"+vpcID+"-e", "vp-"+vpcID+"-i", "/var/run/netns/"+name, 9000); err != nil {
 			return err
 		}
 
-		// create public bridge in netns
 		if err := netns.Call(name, func() error {
 			return netif.CreateBridge("br-public", 1500)
 		}); err != nil {
 			return err
 		}
 
-		// set veth to ext public bridge
-		if err := netif.BridgeSetMaster("vp-"+name+"-e", "br-public"); err != nil {
+		if err := netif.BridgeSetMaster("vp-"+vpcID+"-e", "br-public"); err != nil {
 			return err
 		}
 
-		// set veth to int public bridge
 		if err := netns.Call(name, func() error {
-			return netif.BridgeSetMaster("vp-public-i", "br-public")
+			return netif.BridgeSetMaster("vp-"+vpcID+"-i", "br-public")
 		}); err != nil {
 			return err
 		}
 
-		// set set ext veth up
-		if err := netif.LinkSetUp("vp-" + name + "-e"); err != nil {
+		if err := netif.LinkSetUp("vp-" + vpcID + "-e"); err != nil {
 			return err
 		}
-		// set set int veth up
 		if err := netns.Call(name, func() error {
-			return netif.LinkSetUp("vp-public-i")
+			return netif.LinkSetUp("vp-" + vpcID + "-i")
 		}); err != nil {
 			return err
 		}

internal/vpc/delete.go

@@ -1,6 +1,8 @@
 package vpc
 
 import (
+	"strings"
+
 	"git.g3e.fr/syonad/two/internal/netif"
 	"git.g3e.fr/syonad/two/internal/netns"
 	"git.g3e.fr/syonad/two/pkg/db/kv"
@@ -12,7 +14,9 @@ func DeleteVPC(db *badger.DB, name string) error {
 	if state, err := kv.GetFromDB(db, "vpc/"+name+"/state"); err != nil {
 		return err
 	} else if state == "deleting" {
-		if err := netif.DeleteLink("vp-" + name + "-e"); err != nil {
+		vpcID := strings.SplitN(name, "-", 2)[1]
+
+		if err := netif.DeleteLink("vp-" + vpcID + "-e"); err != nil {
 			return err
 		}
 

pkg/db/kv/listByPrefix.go

@@ -0,0 +1,33 @@
+package kv
+
+import (
+	"github.com/dgraph-io/badger/v4"
+)
+
+// ListByPrefix returns all key-value pairs whose key starts with prefix.
+func ListByPrefix(db *badger.DB, prefix string) (map[string]string, error) {
+	result := make(map[string]string)
+	p := []byte(prefix)
+
+	err := db.View(func(txn *badger.Txn) error {
+		opts := badger.DefaultIteratorOptions
+		opts.PrefetchSize = 10
+
+		it := txn.NewIterator(opts)
+		defer it.Close()
+
+		for it.Seek(p); it.ValidForPrefix(p); it.Next() {
+			item := it.Item()
+			key := string(item.Key())
+
+			val, err := item.ValueCopy(nil)
+			if err != nil {
+				return err
+			}
+			result[key] = string(val)
+		}
+		return nil
+	})
+
+	return result, err
+}

pkg/prometheus/server.go

@@ -0,0 +1,20 @@
+package promserver
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// Start launches the Prometheus metrics HTTP server on the given address.
+// The provided registry is used to expose metrics at /metrics.
+func Start(address string, registry *prometheus.Registry) {
+	mux := http.NewServeMux()
+	mux.Handle("/metrics", promhttp.HandlerFor(registry, promhttp.HandlerOpts{
+		EnableOpenMetrics: true,
+	}))
+	log.Printf("Prometheus server listening on %s", address)
+	log.Fatal(http.ListenAndServe(address, mux))
+}

pkg/worker/queue.go

@@ -0,0 +1,33 @@
+package worker
+
+import "log"
+
+// Task is a function to be executed asynchronously by a worker.
+type Task func()
+
+// Queue is a FIFO channel-backed task queue consumed by worker goroutines.
+type Queue struct {
+	tasks chan Task
+}
+
+// New creates a Queue with the given channel buffer size.
+func New(bufferSize int) *Queue {
+	return &Queue{tasks: make(chan Task, bufferSize)}
+}
+
+// Submit enqueues a task. Blocks if the queue is full.
+func (q *Queue) Submit(t Task) {
+	q.tasks <- t
+}
+
+// Start launches n worker goroutines that consume and execute tasks.
+func (q *Queue) Start(n int) {
+	log.Printf("worker: starting %d workers", n)
+	for i := range n {
+		go func(id int) {
+			for task := range q.tasks {
+				task()
+			}
+		}(i)
+	}
+}