feat: add stock ticker app
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commit
30ca1c95df
9 changed files with 357 additions and 0 deletions
4
.dockerignore
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.dockerignore
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*
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!*.go
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!go.sum
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!go.mod
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1
.gitignore
vendored
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.gitignore
vendored
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stock-ticker
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22
Dockerfile
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Dockerfile
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FROM golang:1.19.6-alpine AS builder
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ENV CGO_ENABLED=0
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ENV GOOS=linux
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ENV GOARCH=amd64
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ADD *.go /workspace/
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ADD go.mod /workspace/
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WORKDIR /workspace
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RUN go build -a -v -ldflags="-s -w" -o /workspace/stock-ticker .
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FROM gcr.io/distroless/static-debian11
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COPY --from=builder /workspace/stock-ticker /stock-ticker
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USER 1000
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ENTRYPOINT ["/stock-ticker"]
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HEALTHCHECK NONE
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1
README.md
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README.md
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# Stock Ticker
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3
go.mod
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go.mod
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module gitlab.com/dananglin/stock-ticker
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go 1.19
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78
handlers.go
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handlers.go
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package main
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import (
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"encoding/json"
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"fmt"
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"sort"
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"strings"
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"net/http"
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)
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func healthCheckHandleFunc(w http.ResponseWriter, _ *http.Request) {
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusOK)
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fmt.Fprintln(w, "I'm all good!")
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}
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func stockPriceHandleFunc(apiKey, symbol string, nWeeks int) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodGet {
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusMethodNotAllowed)
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fmt.Fprintf(w, "ERROR: The method '%s' is not allow at this endpoint.\n", r.Method)
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return
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}
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resp, err := http.Get(fmt.Sprintf(requestURLFormat, symbol, apiKey))
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if err != nil {
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusBadGateway)
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fmt.Fprintf(w, "ERROR: Unable to get a response from Alpha Vantage; %v\n", err)
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return
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}
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defer resp.Body.Close()
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decoder := json.NewDecoder(resp.Body)
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var s Stock
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if err := decoder.Decode(&s); err != nil {
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusBadGateway)
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fmt.Fprintf(w, "ERROR: Unable to decode the response from Alpha Vantage; %v\n", err)
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return
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}
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if nWeeks > len(s.TimeSeries) {
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nWeeks = len(s.TimeSeries)
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}
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var keys []string
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for k := range s.TimeSeries {
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keys = append(keys, k)
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}
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sort.Sort(sort.Reverse(sort.StringSlice(keys)))
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var b strings.Builder
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b.WriteString(fmt.Sprintf(tableFormat, s.MetaData.Symbol))
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for i := 0; i < nWeeks; i++ {
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b.WriteString(fmt.Sprintf("%s | %s\n", keys[i], s.TimeSeries[keys[i]].Close))
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}
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w.Header().Set("Content-Type", "text/plain")
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w.WriteHeader(http.StatusOK)
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fmt.Fprintln(w, b.String())
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}
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}
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169
kubernetes/manifest.yaml
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kubernetes/manifest.yaml
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---
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# Namespace
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apiVersion: v1
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kind: Namespace
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metadata:
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name: stock-ticker
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labels:
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app: stock-ticker
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---
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# ServiceAccount
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: stock-ticker
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namespace: stock-ticker
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labels:
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app: stock-ticker
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---
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# Ingress
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apiVersion: networking.k8s.io
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kind: Ingress
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metadata:
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name: stock-ticker
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namespace: stock-ticker
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labels:
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app: stock-ticker
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spec:
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rules:
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- http:
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paths:
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- path: "/"
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pathType: Prefix
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backend:
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service:
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name: stock-ticker
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port:
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number: 80
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---
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# Service
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apiVersion: v1
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kind: Service
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metadata:
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name: stock-ticker
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namespace: stock-ticker
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labels:
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app: stock-ticker
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spec:
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selector:
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app: stock-ticker
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port:
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- protocol: TCP
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port: 80
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targetPort: web
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---
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# ConfigMap
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: stock-ticker
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namespace: stock-ticker
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labels:
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app: stock-ticker
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data:
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SYMBOL: "MSFT"
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NWEEKS: "7"
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---
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# Secret
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apiVersion: v1
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kind: Secret
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metadata:
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name: stock-ticker-api-key
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namespace: stock-ticker
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labels:
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app: stock-ticker
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type: Opaque
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data:
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APIKEY: QzIyN1dEOVczTFVWS1ZWOQ==
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---
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# PDB
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apiVersion: policy/v1
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kind: PodDisruptionBudget
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metadata:
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name: stock-ticker-api-key
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namespace: stock-ticker
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labels:
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app: stock-ticker
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spec:
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minAvailable: 1
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selector:
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matchLabels:
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app: stock-ticker
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---
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# Deployment
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apiVersion: v1
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kind: Deployment
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metadata:
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name: stock-ticker
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namespace: stock-ticker
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labels:
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app: stock-ticker
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spec:
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replicas: 3
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revisionHistoryLimit: 3
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selector:
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matchLabels:
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app: stock-ticker
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template:
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metadata:
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labels:
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app: stock-ticker
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spec:
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serviceAccountName: stock-ticker
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securityContext:
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runAsUser: 1000
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runAsNonRoot: true
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runAsGroup: 1000
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containers:
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- name: stock-ticker
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args:
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- "--address=$(WEBSERVER_HOST):$(WEBSERVER_PORT)"
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env:
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- name: SYMBOL
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valueFrom:
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configMapKeyRef:
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name: stock-ticker
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key: SYMBOL
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- name: APIKEY
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valueFrom:
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secretKeyRef:
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name: stock-ticker-api-key
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key: APIKEY
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- name: NWEEKS
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valueFrom:
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configMapKeyRef:
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name: stock-ticker
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key: NWEEKS
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- name: WEBSERVER_HOST
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valueFrom:
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fieldRef:
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fieldPath: status.podIP
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- name: WEBSERVER_PORT
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value: "8080"
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image: ""
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imagePullPolicy: Always
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livenessProbe:
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httpGet:
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port: 8080
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path: /healthcheck
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initialDelaySeconds: 10
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periodSeconds: 10
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timeoutSeconds: 3
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readinessProbe:
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httpGet:
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port: 8080
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path: /healthcheck
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initialDelaySeconds: 10
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periodSeconds: 10
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timeoutSeconds: 3
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ports:
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- containerPort: 8080
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name: web
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protocol: TCP
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resources:
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limits:
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cpu: 50m
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memory: 75Mi
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requests:
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cpu: 25m
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memory: 50Mi
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65
main.go
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65
main.go
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package main
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import (
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"strconv"
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)
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const (
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requestURLFormat string = "https://www.alphavantage.co/query?function=TIME_SERIES_WEEKLY&symbol=%s&apikey=%s"
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)
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var tableFormat = `
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Symbol: %s
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Week | Closing Price
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==========================
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`
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func main() {
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var address string
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flag.StringVar(&address, "address", "0.0.0.0:8080", "the web server's listening address")
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flag.Parse()
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symbol, err := getEnvironment("SYMBOL")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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apiKey, err := getEnvironment("APIKEY")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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nWeeksString, err := getEnvironment("NWEEKS")
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if err != nil {
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log.Fatalf("ERROR: %v.\n", err)
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}
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nWeeks, err := strconv.Atoi(nWeeksString)
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if err != nil {
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log.Fatalf("ERROR: Unable to parse the number of days from %s, %v\n", nWeeksString, err)
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}
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http.HandleFunc("/healthcheck", healthCheckHandleFunc)
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http.HandleFunc("/stockprice", stockPriceHandleFunc(apiKey, symbol, nWeeks))
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log.Printf("The web server is listening on %s.\n", address)
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log.Fatal(http.ListenAndServe(address, nil))
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}
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func getEnvironment(key string) (string, error) {
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value := os.Getenv(key)
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if value == "" {
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return "", fmt.Errorf("the environment variable %s is not set", key)
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}
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return value, nil
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}
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14
types.go
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14
types.go
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package main
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type Stock struct {
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MetaData MetaData `json:"Meta Data"`
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TimeSeries map[string]StockInfo `json:"Weekly Time Series"`
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}
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type MetaData struct {
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Symbol string `json:"2. Symbol"`
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}
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type StockInfo struct {
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Close string `json:"4. close"`
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}
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