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Merge pull request #1 from devinbinnie/batch_report_worker_poc
Batch report worker poc
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// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved. | ||
// See LICENSE.txt for license information. | ||
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package app | ||
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import ( | ||
"bytes" | ||
"encoding/csv" | ||
"fmt" | ||
"net/http" | ||
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"github.com/mattermost/mattermost/server/public/model" | ||
) | ||
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func (a *App) SaveReportChunk(format string, prefix string, count int, reportData []model.ReportableObject) *model.AppError { | ||
switch format { | ||
case "csv": | ||
return a.saveCSVChunk(prefix, count, reportData) | ||
} | ||
return model.NewAppError("SaveReportChunk", "", nil, "unsupported report format", http.StatusInternalServerError) | ||
} | ||
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func (a *App) saveCSVChunk(prefix string, count int, reportData []model.ReportableObject) *model.AppError { | ||
var buf bytes.Buffer | ||
w := csv.NewWriter(&buf) | ||
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for _, report := range reportData { | ||
err := w.Write(report.ToReport()) | ||
if err != nil { | ||
return model.NewAppError("saveCSVChunk", "", nil, "failed to write report data to CSV", http.StatusInternalServerError) | ||
} | ||
} | ||
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w.Flush() | ||
_, appErr := a.WriteFile(&buf, makeFilename(prefix, count, "csv")) | ||
if appErr != nil { | ||
return appErr | ||
} | ||
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return nil | ||
} | ||
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func (a *App) CompileReportChunks(format string, prefix string, numberOfChunks int, headers []string) (string, *model.AppError) { | ||
switch format { | ||
case "csv": | ||
return a.compileCSVChunks(prefix, numberOfChunks, headers) | ||
} | ||
return "", model.NewAppError("CompileReportChunks", "", nil, "unsupported report format", http.StatusInternalServerError) | ||
} | ||
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func (a *App) compileCSVChunks(prefix string, numberOfChunks int, headers []string) (string, *model.AppError) { | ||
filename := fmt.Sprintf("batch_report_%s.csv", prefix) | ||
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var headerBuf bytes.Buffer | ||
w := csv.NewWriter(&headerBuf) | ||
err := w.Write(headers) | ||
if err != nil { | ||
return "", model.NewAppError("compileCSVChunks", "", nil, "failed to write headers", http.StatusInternalServerError) | ||
} | ||
w.Flush() | ||
_, appErr := a.WriteFile(&headerBuf, filename) | ||
if appErr != nil { | ||
return "", appErr | ||
} | ||
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for i := 0; i < numberOfChunks; i++ { | ||
chunkFilename := makeFilename(prefix, i, "csv") | ||
chunk, err := a.ReadFile(chunkFilename) | ||
if err != nil { | ||
return "", err | ||
} | ||
if _, err = a.AppendFile(bytes.NewReader(chunk), filename); err != nil { | ||
return "", err | ||
} | ||
if err = a.RemoveFile(chunkFilename); err != nil { | ||
return "", err | ||
} | ||
} | ||
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return filename, nil | ||
} | ||
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func (a *App) SendReportToUser(userID string, filename string) *model.AppError { | ||
return nil | ||
} | ||
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func makeFilename(prefix string, count int, extension string) string { | ||
return fmt.Sprintf("batch_report_%s__%d.%s", prefix, count, extension) | ||
} |
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