Executor abstraction (#384)

This change adds a layer of abstraction over poolmgr. Poolmgr is now just one of the ways to turn a function into a service; other implementations will be added. The executor abstraction is a uniform API over all these implementations.

* Executor layer added on top of pool manager

* Removed the external server for executor

* Minor changes to keep existing semantics as much possible

* Separating the executor vs. poolmgr backend functionality and associated data members

* Executor logic separated from Poolmgr backend completely, placeholder for new backend

* Changed references to poolmgr in tests

* Moved poolmgr to it's package, as a side effect moved Cache to its's package (was causing cyclical dependency) and had to make some data structures exposed outside package

* Rebased from master and changed references to tpr -> crd

* Executor layer added on top of pool manager

* Executor logic separated from Poolmgr backend completely, placeholder for new backend

* Changed podName to a generic objectReference in fscache (#391)

Changed podName to a generic objectReference in function service cache implementation.

* Moved poolmgr to it's package, as a side effect moved Cache to its's package (was causing cyclical dependency) and had to make some data structures exposed outside package

* Rebased from master and changed references to tpr -> crd

* Merged from master with latest changes

* Removed stale executor service & deployment from previous merge

* Addressed review comments, still testing some areas

charts/fission-all/templates/deployment.yaml

@@ -226,16 +226,16 @@ spec:
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"
         imagePullPolicy: {{ .Values.pullPolicy }}
         command: ["/fission-bundle"]
-        args: ["--routerPort", "8888", "--poolmgrUrl", "http://poolmgr.{{ .Release.Namespace }}"]
+        args: ["--routerPort", "8888", "--executorUrl", "http://executor.{{ .Release.Namespace }}"]
       serviceAccount: fission-svc
 
 ---
 apiVersion: v1
 kind: Service
 metadata:
-  name: poolmgr
+  name: executor
   labels:
-    svc: poolmgr
+    svc: executor
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 spec:
   type: ClusterIP
@@ -243,13 +243,13 @@ spec:
   - port: 80
     targetPort: 8888
   selector:
-    svc: poolmgr
+    svc: executor
 
 ---
 apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
-  name: poolmgr
+  name: executor
   labels:
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 spec:
@@ -257,14 +257,14 @@ spec:
   template:
     metadata:
       labels:
-        svc: poolmgr
+        svc: executor
     spec:
       containers:
-      - name: poolmgr
+      - name: executor
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"
         imagePullPolicy: {{ .Values.pullPolicy }}
         command: ["/fission-bundle"]
-        args: ["--poolmgrPort", "8888", "--namespace", "{{ .Values.functionNamespace }}", "--fission-namespace", "{{ .Release.Namespace }}"]
+        args: ["--executorPort", "8888", "--namespace", "{{ .Values.functionNamespace }}", "--fission-namespace", "{{ .Release.Namespace }}"]
         env:
         - name: FETCHER_IMAGE
           value: "{{ .Values.fetcherImage }}:{{ .Values.fetcherImageTag }}"
@@ -273,7 +273,6 @@ spec:
         - name: RUNTIME_IMAGE_PULL_POLICY
           value: "{{ .Values.pullPolicy }}"
       serviceAccount: fission-svc
-
 ---
 apiVersion: v1
 kind: Service
@@ -574,4 +573,4 @@ spec:
           claimName: {{ .Values.persistence.existingClaim | default "fission-storage-pvc" }}
       {{- else }}
         emptyDir: {}
-      {{- end -}}
+      {{- end -}}

charts/fission-core/templates/deployment.yaml

@@ -226,16 +226,16 @@ spec:
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"
         imagePullPolicy: {{ .Values.pullPolicy }}
         command: ["/fission-bundle"]
-        args: ["--routerPort", "8888", "--poolmgrUrl", "http://poolmgr.{{ .Release.Namespace }}"]
+        args: ["--routerPort", "8888", "--executorUrl", "http://executor.{{ .Release.Namespace }}"]
       serviceAccount: fission-svc
 
 ---
 apiVersion: v1
 kind: Service
 metadata:
-  name: poolmgr
+  name: executor
   labels:
-    svc: poolmgr
+    svc: executor
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 spec:
   type: ClusterIP
@@ -243,13 +243,13 @@ spec:
   - port: 80
     targetPort: 8888
   selector:
-    svc: poolmgr
+    svc: executor
 
 ---
 apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
-  name: poolmgr
+  name: executor
   labels:
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
 spec:
@@ -257,14 +257,14 @@ spec:
   template:
     metadata:
       labels:
-        svc: poolmgr
+        svc: executor
     spec:
       containers:
-      - name: poolmgr
+      - name: executor
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"
         imagePullPolicy: {{ .Values.pullPolicy }}
         command: ["/fission-bundle"]
-        args: ["--poolmgrPort", "8888", "--namespace", "{{ .Values.functionNamespace }}", "--fission-namespace", "{{ .Release.Namespace }}"]
+        args: ["--executorPort", "8888", "--namespace", "{{ .Values.functionNamespace }}", "--fission-namespace", "{{ .Release.Namespace }}"]
         env:
         - name: FETCHER_IMAGE
           value: "{{ .Values.fetcherImage }}:{{ .Values.fetcherImageTag }}"